java.lang.ClassNotFoundException异常有哪些可能

新手一枚,写了个Struts2的demo,导入Struts2.3.4的jar包,用MyEclipse10自带的tomcat跑然后报错

严重: Exception starting filter struts2base01
java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExcuteFilter
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1358)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1204)
at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:249)
at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:397)
at org.apache.catalina.core.ApplicationFilterConfig.(ApplicationFilterConfig.java:108)
at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:3693)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4340)
at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:791)
at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:771)
at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:525)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:920)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:883)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:492)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1138)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:311)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
at org.apache.catalina.core.StandardHost.start(StandardHost.java:719)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:516)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:566)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
2016-5-6 16:08:43 org.apache.catalina.core.StandardContext start
严重: Error filterStart
2016-5-6 16:08:43 org.apache.catalina.core.StandardContext start
严重: Context [/Struts2_base01] startup failed due to previous errors

6个回答

重新编译下 或者所有JAR包重新导入试下

唯一的可能就是你少了jar包

org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExcuteFilter他提示了这个错误,有几种可能,一种是少包,一种是多包,你去搜一下需要哪些包,再看看包的版本是否合适

问题详情:java.lang.ClassNotFoundException: freemarker.template.TemplateHashModelEx
今天为了使用freemarker模板,想整合到springMVC中,但是这个异常困扰了我好长时间。还是有必要写一篇文章来记录一下这个辛酸的过程了。
其实出现找不到类的异常,一般情况下都是找不到jar包。很自然的会去查看freemarker......
答案就在这里:关于java.lang.ClassNotFoundException异常
----------------------你好,人类,我是来自CSDN星球的问答机器人小C,以上是依据我对问题的理解给出的答案,如果解决了你的问题,望采纳。

类没找到,可能是jar包确实,也有尽可能使你的jar包添加待lib下之后没有创建路径

两种情况:一种是缺少类或者jar包;一种就是编译器有问题:你使用maven重新更新一遍试试看(快捷键ctrl+f5)

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org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:650) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800) at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806) at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498) at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at 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java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990) at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:500) at java.lang.Throwable.readObject(Throwable.java:914) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:606) at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:1017) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1893) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350) at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1990) at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1915) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1798) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1350) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:370) at org.springframework.remoting.httpinvoker.AbstractHttpInvokerRequestExecutor.doReadRemoteInvocationResult(AbstractHttpInvokerRequestExecutor.java:292) at org.springframework.remoting.httpinvoker.AbstractHttpInvokerRequestExecutor.readRemoteInvocationResult(AbstractHttpInvokerRequestExecutor.java:243) at org.springframework.remoting.httpinvoker.SimpleHttpInvokerRequestExecutor.doExecuteRequest(SimpleHttpInvokerRequestExecutor.java:96) at org.springframework.remoting.httpinvoker.AbstractHttpInvokerRequestExecutor.executeRequest(AbstractHttpInvokerRequestExecutor.java:138) at org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.executeRequest(HttpInvokerClientInterceptor.java:194) at org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.executeRequest(HttpInvokerClientInterceptor.java:176) at org.springframework.remoting.httpinvoker.HttpInvokerClientInterceptor.invoke(HttpInvokerClientInterceptor.java:144) ... 89 more ``` ``` ``` 有大神能看出来是什么问题吗 急!!!!感谢
java.lang.ClassNotFoundException异常,哪位大神来帮我看看
严重: Error configuring application listener of class com.huaxu.readmeter.modules.sys.listener.WebContextListener java.lang.ClassNotFoundException: com.huaxu.readmeter.modules.sys.listener.WebContextListener at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1720) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1571) at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:506) at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:488) at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:115) at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4932) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5528) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150) at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:901) at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:877) at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:652) at org.apache.catalina.startup.HostConfig.deployDescriptor(HostConfig.java:677) at org.apache.catalina.startup.HostConfig$DeployDescriptor.run(HostConfig.java:1912) at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) 六月 09, 2017 8:04:46 上午 org.apache.catalina.core.StandardContext listenerStart 严重: Skipped installing application listeners due to previous error(s) 六月 09, 2017 8:04:46 上午 org.apache.catalina.core.StandardContext startInternal 严重: One or more listeners failed to start. Full details will be found in the appropriate container log file 六月 09, 2017 8:04:46 上午 org.apache.catalina.core.StandardContext startInternal 严重: Context [/jeesite] startup failed due to previous errors 六月 09, 2017 8:04:46 上午 org.apache.catalina.startup.HostConfig deployDescriptor 信息: Deployment of configuration descriptor D:\HLHTCB\.metadata\.plugins\org.eclipse.wst.server.core\tmp0\conf\Catalina\localhost\jeesite.xml has finished in 3,648 ms 六月 09, 2017 8:04:46 上午 org.apache.coyote.AbstractProtocol start 信息: Starting ProtocolHandler ["http-bio-8080"] 六月 09, 2017 8:04:46 上午 org.apache.coyote.AbstractProtocol start 信息: Starting ProtocolHandler ["ajp-bio-8009"] 六月 09, 2017 8:04:46 上午 org.apache.catalina.startup.Catalina start 信息: Server startup in 4076 ms 我有这个类为什么编译不到呢?我重新clean项目了,也重新加载了maven了
刚学习JSF,出现java.lang.ClassNotFoundException的异常
<p> </p> <pre name="code" class="web.xml">&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;web-app xmlns="http://java.sun.com/xml/ns/javaee" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.5" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd"&gt; &lt;servlet&gt; &lt;servlet-name&gt;Faces Servlet&lt;/servlet-name&gt; &lt;servlet-class&gt;javax.faces.webapp.FacesServlet&lt;/servlet-class&gt; &lt;load-on-startup&gt;0&lt;/load-on-startup&gt; &lt;/servlet&gt; &lt;servlet-mapping&gt; &lt;servlet-name&gt;Faces Servlet&lt;/servlet-name&gt; &lt;url-pattern&gt;*.faces&lt;/url-pattern&gt; &lt;/servlet-mapping&gt; &lt;welcome-file-list&gt; &lt;welcome-file&gt;index.jsp&lt;/welcome-file&gt; &lt;/welcome-file-list&gt; &lt;/web-app&gt; </pre> <p> 而且lib 也导入这些依赖包</p> <p><br><img src="http://dl.iteye.com/upload/attachment/0079/2244/98bef91e-2269-30e7-b458-66f4e95a4b88.jpg" alt=""></p> <p>但项目运行的时候都会出现下面的异常,包括复制别人的项目</p> <p> </p> <p>异常如下:<br>java.lang.ClassNotFoundException: javax.faces.webapp.FacesServlet</p> <p> <span style="white-space: pre;"> </span>at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1701)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1546)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.core.DefaultInstanceManager.loadClass(DefaultInstanceManager.java:525)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.core.DefaultInstanceManager.loadClassMaybePrivileged(DefaultInstanceManager.java:507)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:124)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1136)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1080)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5015)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5302)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.core.ContainerBase.addChildInternal(ContainerBase.java:897)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.core.ContainerBase.addChild(ContainerBase.java:873)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.core.StandardHost.addChild(StandardHost.java:615)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1095)</p> <p><span style="white-space: pre;"> </span>at org.apache.catalina.startup.HostConfig$DeployDirectory.run(HostConfig.java:1617)</p> <p><span style="white-space: pre;"> </span>at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)</p> <p><span style="white-space: pre;"> </span>at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)</p> <p><span style="white-space: pre;"> </span>at java.util.concurrent.FutureTask.run(FutureTask.java:138)</p> <p><span style="white-space: pre;"> </span>at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)</p> <p><span style="white-space: pre;"> </span>at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)</p> <p><span style="white-space: pre;"> </span>at java.lang.Thread.run(Thread.java:619)</p> <p> </p>
JDBC驱动加载失败,异常:java.lang.ClassNotFoundException: com.mysql.jdbc.Driver
昨天写一个Swing小程序,用JDBC连接数据库,运行的时候报java.lang.ClassNotFoundException: com.mysql.jdbc.Driver这个异常。 于是写一个小demo测试一下: ``` package fly; import java.sql.Connection; import java.sql.DriverManager; import java.sql.SQLException; public class test2 { Connection connection; public Connection getConnection(){ try { Class.forName("com.mysql.jdbc.Driver"); System.out.println("数据库驱动加载成功"); } catch (ClassNotFoundException e) { e.printStackTrace(); } try { connection= DriverManager.getConnection("jdbc:mysql://localhost:3306/test","root","root"); System.out.println("连接成功"); } catch (SQLException e) { e.printStackTrace(); } return connection; } public static void main(String[] args) { test2 test2=new test2(); test2.getConnection(); } } ``` 运行报异常如下: ``` "C:\Program Files\Java\jdk1.8.0_201\bin\java.exe" "-javaagent:C:\Program Files\JetBrains\IntelliJ IDEA 2018.3.6\lib\idea_rt.jar=6199:C:\Program Files\JetBrains\IntelliJ IDEA 2018.3.6\bin" -Dfile.encoding=UTF-8 -classpath "C:\Program Files\Java\jdk1.8.0_201\jre\lib\charsets.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\deploy.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\access-bridge-64.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\cldrdata.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\dnsns.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\jaccess.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\jfxrt.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\localedata.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\nashorn.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunec.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunjce_provider.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunmscapi.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\sunpkcs11.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\ext\zipfs.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\javaws.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jce.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jfr.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jfxswt.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\jsse.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\management-agent.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\plugin.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\resources.jar;C:\Program Files\Java\jdk1.8.0_201\jre\lib\rt.jar;E:\JavaData\SwingProgram\out\production\SwingProgram" fly.test2 java.lang.ClassNotFoundException: com.mysql.jdbc.Driver at java.net.URLClassLoader.findClass(URLClassLoader.java:382) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:264) at fly.test2.getConnection(test2.java:11) at fly.test2.main(test2.java:28) java.sql.SQLException: No suitable driver found for jdbc:mysql://localhost:3306/test at java.sql.DriverManager.getConnection(DriverManager.java:689) at java.sql.DriverManager.getConnection(DriverManager.java:247) at fly.test2.getConnection(test2.java:17) at fly.test2.main(test2.java:28) Process finished with exit code 0 ``` 真是心态爆炸,希望知道是什么问题的大佬指点一下迷津,感激不尽!!!!
SpringDm为什么老报java.lang.ClassNotFoundException
请各位大侠熟悉osgi的帮忙解决 异常 [code ="java"] Exception in thread "SpringOsgiExtenderThread-2" org.springframework.beans.factory.CannotLoadBeanClassException: Error loading class [org.springframework.orm.ibatis.SqlMapClientFactoryBean] for bean with name 'sqlMapClient' defined in URL [bundleentry://266.fwk2279771/META-INF/spring/data-source.xml]: problem with class file or dependent class; nested exception is java.lang.NoClassDefFoundError: org.springframework.orm.ibatis.SqlMapClientFactoryBean not found from bundle [Contact (Contact)] at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1144) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:524) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1177) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:758) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:422) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:728) at org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext.access$1600(AbstractDelegatedExecutionApplicationContext.java:69) at org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext$4.run(AbstractDelegatedExecutionApplicationContext.java:355) at org.springframework.osgi.util.internal.PrivilegedUtils.executeWithCustomTCCL(PrivilegedUtils.java:85) at org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext.completeRefresh(AbstractDelegatedExecutionApplicationContext.java:320) at org.springframework.osgi.extender.internal.dependencies.startup.DependencyWaiterApplicationContextExecutor$CompleteRefreshTask.run(DependencyWaiterApplicationContextExecutor.java:132) at java.lang.Thread.run(Thread.java:662) Caused by: java.lang.NoClassDefFoundError: org.springframework.orm.ibatis.SqlMapClientFactoryBean not found from bundle [Contact (Contact)] at org.springframework.osgi.util.BundleDelegatingClassLoader.findClass(BundleDelegatingClassLoader.java:112) at org.springframework.osgi.util.BundleDelegatingClassLoader.loadClass(BundleDelegatingClassLoader.java:156) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at org.springframework.util.ClassUtils.forName(ClassUtils.java:211) at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:385) at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1138) ... 11 more Caused by: java.lang.NoClassDefFoundError: org/springframework/beans/factory/FactoryBean at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClassCond(ClassLoader.java:631) at java.lang.ClassLoader.defineClass(ClassLoader.java:615) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.defineClass(DefaultClassLoader.java:188) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClassHoldingLock(ClasspathManager.java:626) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.defineClass(ClasspathManager.java:608) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findClassImpl(ClasspathManager.java:562) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClassImpl(ClasspathManager.java:486) at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:459) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216) at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:400) at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:35) at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:464) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at org.eclipse.osgi.internal.loader.BundleLoader.loadClass(BundleLoader.java:345) at org.eclipse.osgi.framework.internal.core.BundleHost.loadClass(BundleHost.java:229) at org.eclipse.osgi.framework.internal.core.AbstractBundle.loadClass(AbstractBundle.java:1207) at org.springframework.osgi.util.BundleDelegatingClassLoader.findClass(BundleDelegatingClassLoader.java:99) ... 16 more Caused by: java.lang.ClassNotFoundException: org.springframework.beans.factory.FactoryBean at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:513) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:429) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:417) at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) [/code] 项目结构 [img]http://dl.iteye.com/upload/attachment/0071/5377/c79ecbc1-53d9-3e64-af47-c9a6e0331319.jpg[/img] MANIFEST.MF Manifest-Version: 1.0 Bundle-ManifestVersion: 2 Bundle-Name: Contact Bundle-SymbolicName: Contact Bundle-Version: 1.0.0.qualifier Export-Package: com.javaworld.sample.osgi.spring.contact Bundle-ClassPath: ., lib/commons-dbcp-1.2.2.jar, lib/commons-pool-1.4.jar, lib/mysql-connector-java-5.0.8-bin-g.jar, lib/commons-io-1.0.jar, lib/commons-lang-20030203.000129.jar, lib/aspectjtools-1.6.12.jar Import-Package: javax.servlet;version="2.4.0", javax.servlet.http;version="2.4.0", org.apache.jasper, org.osgi.framework;version="1.4.0", org.springframework.orm.ibatis;version="2.5.6.SEC03", org.springframework.orm.ibatis.support;version="2.5.6.SEC03", org.springframework.osgi.web.context.support;version="1.2.0.rc1", org.springframework.web.context;version="2.5.6", org.springframework.web.context.support;version="2.5.6" Require-Bundle: org.springframework.osgi.core;bundle-version="1.2.0", org.springframework.osgi.io;bundle-version="1.2.0", org.springframework.beans;bundle-version="2.5.6", org.springframework.context;bundle-version="2.5.6", org.springframework.core;bundle-version="2.5.6" DynamicImport-Package: org.springframework.osgi.web.context.support.*, org.springframework.web.context.*
maven整合struts2,出现错误java.lang.ClassNotFoundException。
在新建maven项目成功后,试验了helloworld简单web程序,成功。 但是在利用maven整合struts2时出现错误。异常提示找不到filter。 不知道为什么,错误提示如下: 严重: Exception starting filter struts2 java.lang.ClassNotFoundException: org.apache.struts2.dispatcher.filter.StrutsPrepareAndExecuteFilter at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491) at org.apache.catalina.core.ApplicationFilterConfig.getFilter(ApplicationFilterConfig.java:269) at org.apache.catalina.core.ApplicationFilterConfig.setFilterDef(ApplicationFilterConfig.java:422) at org.apache.catalina.core.ApplicationFilterConfig.<init>(ApplicationFilterConfig.java:115) at org.apache.catalina.core.StandardContext.filterStart(StandardContext.java:4001) at org.apache.catalina.core.StandardContext.start(StandardContext.java:4651) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardHost.start(StandardHost.java:785) at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045) at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:445) at org.apache.catalina.startup.Embedded.start(Embedded.java:825) at org.codehaus.mojo.tomcat.AbstractRunMojo.startContainer(AbstractRunMojo.java:558) at org.codehaus.mojo.tomcat.AbstractRunMojo.execute(AbstractRunMojo.java:255) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:137) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:208) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:154) at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:146) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:117) at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:81) at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:56) at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:305) at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:192) at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:105) at org.apache.maven.cli.MavenCli.execute(MavenCli.java:956) at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:290) at org.apache.maven.cli.MavenCli.main(MavenCli.java:194) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:289) at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:229) at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:415) at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:356)
java.lang.NoClassDefFoundError
package hx.nan.JDBCUtils; import java.sql.Connection; import java.sql.DriverManager; import java.sql.ResultSet; import java.sql.SQLException; import java.sql.Statement; import java.util.ResourceBundle; public class DBConnection { public static String URL; public static String USERNAME; public static String PASSWORD; public static String DRIVER; private DBConnection(){} static{ ResourceBundle rb = ResourceBundle.getBundle("JDBCUtils.jdbc_config"); URL = rb.getString("URL"); USERNAME = rb.getString("USERNAME"); PASSWORD = rb.getString("PASSWORD"); DRIVER = rb.getString("DRIVER"); try { Class.forName(DRIVER); } catch (ClassNotFoundException e) { System.out.println("驱动加载失败"); e.printStackTrace(); } } public static Connection getConnection(){ Connection con = null; try { con = DriverManager.getConnection(URL,USERNAME,PASSWORD); } catch (SQLException e) { e.printStackTrace(); System.out.println("获取数据库连接失败"); } return con; } public static void close(ResultSet rs,Statement state,Connection con){ try { if(rs!=null){ rs.close(); } state.close(); con.close(); } catch (SQLException e) { e.printStackTrace(); } } } java.lang.NoClassDefFoundError: Could not initialize class hx.nan.JDBCUtils.DBConnection hx.nan.JDBCUtils.JdbcTemplete.update(JdbcTemplete.java:30) hx.nan.Dao.UserDaoImp.add(UserDaoImp.java:33) hx.nan.action.RegisterAction.doPost(RegisterAction.java:29) javax.servlet.http.HttpServlet.service(HttpServlet.java:648) javax.servlet.http.HttpServlet.service(HttpServlet.java:729) org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 如果没有静态块的话不会报错,正常运行,这是怎么回事?而且try catch也没有捕获到异常
使用ssm出现java.lang.ClassNotFoundException: ${jdbc.driver}异常,求各位大神看一下
spring配置文件 <!-- 配置读取properties文件 jdbc.properties --> <context:property-placeholder location="classpath:jdbc.properties" /> <!-- 配置数据源 --> <bean id="dataSource" class="com.alibaba.druid.pool.DruidDataSource"> <property name="driverClassName" value="${jdbc.driver}" /> <property name="url" value="${jdbc.url}"/> <property name="username" value="${jdbc.username}" /> <property name="password" value="${jdbc.password}" /> </bean> <!-- 配置sqlSessionFactory --> <bean id ="sqlSessionFactory" class="org.mybatis.spring.SqlSessionFactoryBean"> <!-- 核心配置文件 --> <property name="configLocation" value="classpath:mybatis/SqlMapConfig.xml" /> <!-- 注入数据源 --> <property name="dataSource" ref="dataSource" /> </bean> properties文件: jdbc.driver=com.mysql.jdbc.Driver jdbc.url=jdbc:mysql://localhost:3306/crm?characterEncoding=utf-8 jdbc.username=root jdbc.password=root classpath下配置了驱动 ![图片说明](https://img-ask.csdn.net/upload/201906/13/1560422889_65440.png) tomcat也配置了 ![图片说明](https://img-ask.csdn.net/upload/201906/13/1560423511_262957.png) 但是还是报错,求各位大神指点一下!
初学java反射的问题 一直抛出classnotfoundexception
public class TestReflection { public static void main(String[] args) { try{ String str = "T"; Class c = Class.forName(str); c.newInstance(); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (InstantiationException e) { e.printStackTrace(); } catch (IllegalAccessException e) { e.printStackTrace(); } } } class T { static { System.out.println("T Loaded!"); } int i; String s; public void m (int i) { this.i = i; } public String getS() { return s; } } 抛出的异常如下: java.lang.ClassNotFoundException: T at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:191) at TestReflection.TestReflection.main(TestReflection.java:8)
ibatis异常
Exception in thread "Main Thread" java.lang.ExceptionInInitializerError Caused by: com.ibatis.sqlmap.client.SqlMapException: There was an error while building the SqlMap instance. --- The error occurred in the SQL Map Configuration file. --- The error occurred while configuring the data source. --- Check the data source type or class. --- Cause: com.ibatis.sqlmap.client.SqlMapException: Error initializing DataSource. Could not instantiate DataSourceFactory. Cause: java.lang.ClassNotFoundException: C3P0 Caused by: java.lang.ClassNotFoundException: C3P0 Caused by: com.ibatis.sqlmap.client.SqlMapException: Error initializing DataSource. Could not instantiate DataSourceFactory. Cause: java.lang.ClassNotFoundException: C3P0 Caused by: java.lang.ClassNotFoundException: C3P0 at com.ibatis.sqlmap.engine.builder.xml.XmlSqlMapClientBuilder.buildSqlMap(XmlSqlMapClientBuilder.java:203) at com.ibatis.sqlmap.client.SqlMapClientBuilder.buildSqlMapClient(SqlMapClientBuilder.java:49) at com.onlineoa.model.dao.CommonDao$1.initialValue(CommonDao.java:20) at com.onlineoa.model.dao.CommonDao$1.initialValue(CommonDao.java:1) at java.lang.ThreadLocal.setInitialValue(ThreadLocal.java:141) at java.lang.ThreadLocal.get(ThreadLocal.java:131) at com.onlineoa.model.dao.CommonDao.newInstance(CommonDao.java:33) at com.onlineoa.model.biz.UserActiveBiz.<clinit>(UserActiveBiz.java:11) Caused by: com.ibatis.sqlmap.client.SqlMapException: Error initializing DataSource. Could not instantiate DataSourceFactory. Cause: java.lang.ClassNotFoundException: C3P0 Caused by: java.lang.ClassNotFoundException: C3P0 at com.ibatis.sqlmap.engine.builder.xml.XmlSqlMapClientBuilder.parseDataSource(XmlSqlMapClientBuilder.java:386) at com.ibatis.sqlmap.engine.builder.xml.XmlSqlMapClientBuilder.parseTransactionManager(XmlSqlMapClientBuilder.java:328) at com.ibatis.sqlmap.engine.builder.xml.XmlSqlMapClientBuilder.parseSqlMapConfig(XmlSqlMapClientBuilder.java:225) at com.ibatis.sqlmap.engine.builder.xml.XmlSqlMapClientBuilder.buildSqlMap(XmlSqlMapClientBuilder.java:199) ... 7 more Caused by: java.lang.ClassNotFoundException: C3P0 at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:303) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:248) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at com.ibatis.common.resources.Resources.classForName(Resources.java:244) at com.ibatis.common.resources.Resources.instantiate(Resources.java:260) at com.ibatis.sqlmap.engine.builder.xml.XmlSqlMapClientBuilder.parseDataSource(XmlSqlMapClientBuilder.java:377) ... 10 more
mysql数据库连接异常问题
java.lang.ClassNotFoundException: org.g.Driver at java.net.URLClassLoader$1.run(URLClassLoader.java:372) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:360) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:260) at runDemo.DataBase.main(DataBase.java:22)
ClassNotFoundException
这个项目是用MAVEN建立的 这个是全部的异常: java.io.IOException: java.lang.ClassNotFoundException: org.springframework.web.SpringServletContainerInitializer at org.apache.catalina.startup.WebappServiceLoader.loadServices(WebappServiceLoader.java:200) at org.apache.catalina.startup.WebappServiceLoader.load(WebappServiceLoader.java:158) at org.apache.catalina.startup.ContextConfig.processServletContainerInitializers(ContextConfig.java:1573) at org.apache.catalina.startup.ContextConfig.webConfig(ContextConfig.java:1279) at org.apache.catalina.startup.ContextConfig.configureStart(ContextConfig.java:887) at org.apache.catalina.startup.ContextConfig.lifecycleEvent(ContextConfig.java:387) at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117) at org.apache.catalina.util.LifecycleBase.fireLifecycleEvent(LifecycleBase.java:90) at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5472) at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:147) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1572) at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1562) at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source) at java.util.concurrent.FutureTask.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: java.lang.ClassNotFoundException: org.springframework.web.SpringServletContainerInitializer at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1858) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1701) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Unknown Source) at org.apache.catalina.startup.WebappServiceLoader.loadServices(WebappServiceLoader.java:197) ... 16 more 我在项目里边看了,spring-web这个jar包是在Maven Dependencies中的,但是不为什么就是提示找不到这个类。 求问各位大神这个问题要怎么解决?
这个异常怎么解决 谢谢!
![图片说明](https://img-ask.csdn.net/upload/201803/26/1522026367_658580.png) ibatis写的增删改差连接的mysql数据库.谢谢! 三月 26, 2018 1:51:08 下午 com.ibatis.common.logging.jdk14.Jdk14LoggingImpl error 严重: SimpleDataSource: Error while loading properties. Cause: java.lang.ClassNotFoundException: driver java.lang.ClassNotFoundException: driver at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:195) at com.ibatis.common.resources.Resources.classForName(Resources.java:265) at com.ibatis.common.resources.Resources.instantiate(Resources.java:281) at com.ibatis.common.jdbc.SimpleDataSource.initialize(SimpleDataSource.java:199) at com.ibatis.common.jdbc.SimpleDataSource.<init>(SimpleDataSource.java:116) at com.ibatis.sqlmap.engine.datasource.SimpleDataSourceFactory.initialize(SimpleDataSourceFactory.java:31) at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser$9.process(SqlMapConfigParser.java:347) at com.ibatis.common.xml.NodeletParser.processNodelet(NodeletParser.java:121) at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:105) at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:102) at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:102) at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:72) at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:51) at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:86) at com.ibatis.sqlmap.client.SqlMapClientBuilder.buildSqlMapClient(SqlMapClientBuilder.java:63) at com.ahedu.IStudentDAOImpl.<clinit>(IStudentDAOImpl.java:16) Exception in thread "main" java.lang.ExceptionInInitializerError Caused by: java.lang.RuntimeException: Error occurred. Cause: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/transactionManager/dataSource/end()'. Cause: com.ibatis.sqlmap.client.SqlMapException: Error initializing DataSource. Could not instantiate DataSourceFactory. Cause: java.lang.RuntimeException: SimpleDataSource: Error while loading properties. Cause: java.lang.ClassNotFoundException: driver at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:89) at com.ibatis.sqlmap.client.SqlMapClientBuilder.buildSqlMapClient(SqlMapClientBuilder.java:63) at com.ahedu.IStudentDAOImpl.<clinit>(IStudentDAOImpl.java:16) Caused by: com.ibatis.common.xml.NodeletException: Error parsing XML. Cause: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/transactionManager/dataSource/end()'. Cause: com.ibatis.sqlmap.client.SqlMapException: Error initializing DataSource. Could not instantiate DataSourceFactory. Cause: java.lang.RuntimeException: SimpleDataSource: Error while loading properties. Cause: java.lang.ClassNotFoundException: driver at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:53) at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser.parse(SqlMapConfigParser.java:86) ... 2 more Caused by: java.lang.RuntimeException: Error parsing XPath '/sqlMapConfig/transactionManager/dataSource/end()'. Cause: com.ibatis.sqlmap.client.SqlMapException: Error initializing DataSource. Could not instantiate DataSourceFactory. Cause: java.lang.RuntimeException: SimpleDataSource: Error while loading properties. Cause: java.lang.ClassNotFoundException: driver at com.ibatis.common.xml.NodeletParser.processNodelet(NodeletParser.java:123) at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:105) at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:102) at com.ibatis.common.xml.NodeletParser.process(NodeletParser.java:102) at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:72) at com.ibatis.common.xml.NodeletParser.parse(NodeletParser.java:51) ... 3 more Caused by: com.ibatis.sqlmap.client.SqlMapException: Error initializing DataSource. Could not instantiate DataSourceFactory. Cause: java.lang.RuntimeException: SimpleDataSource: Error while loading properties. Cause: java.lang.ClassNotFoundException: driver at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser$9.process(SqlMapConfigParser.java:354) at com.ibatis.common.xml.NodeletParser.processNodelet(NodeletParser.java:121) ... 8 more Caused by: java.lang.RuntimeException: SimpleDataSource: Error while loading properties. Cause: java.lang.ClassNotFoundException: driver at com.ibatis.common.jdbc.SimpleDataSource.initialize(SimpleDataSource.java:210) at com.ibatis.common.jdbc.SimpleDataSource.<init>(SimpleDataSource.java:116) at com.ibatis.sqlmap.engine.datasource.SimpleDataSourceFactory.initialize(SimpleDataSourceFactory.java:31) at com.ibatis.sqlmap.engine.builder.xml.SqlMapConfigParser$9.process(SqlMapConfigParser.java:347) ... 9 more Caused by: java.lang.ClassNotFoundException: driver at java.net.URLClassLoader$1.run(URLClassLoader.java:366) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:195) at com.ibatis.common.resources.Resources.classForName(Resources.java:265) at com.ibatis.common.resources.Resources.instantiate(Resources.java:281) at com.ibatis.common.jdbc.SimpleDataSource.initialize(SimpleDataSource.java:199) ... 12 more ![图片说明](https://img-ask.csdn.net/upload/201803/26/1522045555_391520.png) 什么原因啊 弄了好久了!
本地运行spark,JNI error, NoClassDefFoundError
异常信息如下:运行spark 的wordcount demo,引用 的jar都依赖好好的, 部署spark 的时候遇见过类似错误,通过环境变量指定hadoop的jni就好了,现在在本机ide不知道该怎么办了 Error: A JNI error has occurred, please check your installation and try again Exception in thread "main" java.lang.NoClassDefFoundError: org/apache/spark/api/java/function/FlatMapFunction at java.lang.Class.getDeclaredMethods0(Native Method) at java.lang.Class.privateGetDeclaredMethods(Class.java:2701) Disconnected from the target VM, address: '127.0.0.1:58564', transport: 'socket' at java.lang.Class.privateGetMethodRecursive(Class.java:3048) at java.lang.Class.getMethod0(Class.java:3018) at java.lang.Class.getMethod(Class.java:1784) at sun.launcher.LauncherHelper.validateMainClass(LauncherHelper.java:544) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:526) Caused by: java.lang.ClassNotFoundException: org.apache.spark.api.java.function.FlatMapFunction at java.net.URLClassLoader.findClass(URLClassLoader.java:381) at java.lang.ClassLoader.loadClass(ClassLoader.java:424) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ... 7 more
mybatis +spring 整合时候出现了问题
异常:java.lang.ClassNotFoundException: org.apache.ibatis.session.SqlSessionFactory at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1645) at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1491) at java.lang.Class.getDeclaredFields0(Native Method) at java.lang.Class.privateGetDeclaredFields(Class.java:2291) at java.lang.Class.getDeclaredFields(Class.java:1743) 我想知道难道整合的时候,有些包要舍弃吗?或者说整合的时候,会有不同的包引入吗?
ssm项目:明明已经导入jar包,但运行时却报ClassNotFoundException异常。
异常信息如下: org.springframework.beans.factory.CannotLoadBeanClassException: Cannot find class [org.mybatis.spring.SqlSessionFactoryBean.class] for bean with name 'sessionFactory' defined in class path resource [spring/applicationContext-dao.xml]; nested exception is java.lang.ClassNotFoundException: org.mybatis.spring.SqlSessionFactoryBean.class at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1275) at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.predictBeanType(AbstractAutowireCapableBeanFactory.java:575) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:1344) at org.springframework.beans.factory.support.AbstractBeanFactory.isFactoryBean(AbstractBeanFactory.java:910) at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:609) at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932) at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139) at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83) at com.yong.mapper.UserMapperTest.setUp(UserMapperTest.java:18) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) at java.lang.reflect.Method.invoke(Method.java:597) at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:45) at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15) at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:42) at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:27) at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:263) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:68) at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:47) at org.junit.runners.ParentRunner$3.run(ParentRunner.java:231) at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:60) at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:229) at org.junit.runners.ParentRunner.access$000(ParentRunner.java:50) at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:222) at org.junit.runners.ParentRunner.run(ParentRunner.java:300) at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:50) at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390) at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197) Caused by: java.lang.ClassNotFoundException: org.mybatis.spring.SqlSessionFactoryBean.class at java.net.URLClassLoader$1.run(URLClassLoader.java:202) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:190) at java.lang.ClassLoader.loadClass(ClassLoader.java:306) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:247) at org.springframework.util.ClassUtils.forName(ClassUtils.java:260) at org.springframework.beans.factory.support.AbstractBeanDefinition.resolveBeanClass(AbstractBeanDefinition.java:416) at org.springframework.beans.factory.support.AbstractBeanFactory.doResolveBeanClass(AbstractBeanFactory.java:1296) at org.springframework.beans.factory.support.AbstractBeanFactory.resolveBeanClass(AbstractBeanFactory.java:1267) ... 32 more 提示找不到的类是SqlSessionFactoryBean.class,但是下图可以看到已经导入的jar包下有这个类 啊![图片说明](https://img-ask.csdn.net/upload/201604/21/1461208942_696875.png)
为什么在MyEclips下运行链接数据库的java程序会报异常,但在dos下可以。
import java.sql.*; public class Connect { /** * @param args */ public void getConnection() { String driverName = "com.microsoft.sqlserver.jdbc.SQLServerDriver"; Connection dbConn=null; try{ Class.forName(driverName); System.out.println("ok"); Connection con = DriverManager.getConnection("jdbc:sqlserver://localhost;databaseName=master;user=huyaozhong;password=123456"); System.out.println("Connection Successful!"); } catch (Exception e){ e.printStackTrace(); } } public static void main(String [] args) { Connect conn=new Connect(); conn.getConnection(); } } MyEclipse下的运行结果: java.lang.ClassNotFoundException: com.microsoft.sqlserver.jdbc.SQLServerDriver at java.net.URLClassLoader$1.run(URLClassLoader.java:200) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:188) at java.lang.ClassLoader.loadClass(ClassLoader.java:307) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301) at java.lang.ClassLoader.loadClass(ClassLoader.java:252) at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:320) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:169) at Connect.getConnection(Connect.java:13) at Connect.main(Connect.java:25) dos下运行结果: ok Connection Successful!
终于明白阿里百度这样的大公司,为什么面试经常拿ThreadLocal考验求职者了
点击上面↑「爱开发」关注我们每晚10点,捕获技术思考和创业资源洞察什么是ThreadLocalThreadLocal是一个本地线程副本变量工具类,各个线程都拥有一份线程私有的数
程序员必须掌握的核心算法有哪些?
由于我之前一直强调数据结构以及算法学习的重要性,所以就有一些读者经常问我,数据结构与算法应该要学习到哪个程度呢?,说实话,这个问题我不知道要怎么回答你,主要取决于你想学习到哪些程度,不过针对这个问题,我稍微总结一下我学过的算法知识点,以及我觉得值得学习的算法。这些算法与数据结构的学习大多数是零散的,并没有一本把他们全部覆盖的书籍。下面是我觉得值得学习的一些算法以及数据结构,当然,我也会整理一些看过...
《奇巧淫技》系列-python!!每天早上八点自动发送天气预报邮件到QQ邮箱
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