求教JavaEE5.0项目如何更改成6.0项目_course

项目中需要接入第三方功能接口，那些接口需要高版本的。求教各位大神应该如何解决配置服务器。我用的是Tomcat服务器。

阿里云轻量应用服务器配置了tomcat后外部浏览器无法访问_course

1相关规则已经配置了  2.tomcat已经开启  3.查看端口 （正在监听）  问题，外部浏览器还是无法访问服务器  找了一天的问题，没找到源头在哪里，心态炸裂了

下载文件速度问题，接口返回流下载速度慢_course

1.阿里云服务器，带宽是5M，我把文件直接放入到tomcat里面，然后访问下载速度在400kb/s，但是我使用java接口返回流下载的时候，却只有100kb/s，这个是怎么回事，哪位大神帮忙看下

tomcat正常启动，可与访问tomcat主页，但是不能访问自己写的Jsp页面_course

   我把tomcat默认端口，修改成了8088端口，防止其他进程占用8080端口！ tomcat可以正常启动！ 运行环境：win10 tomcat 7.093版本 eclipise ee 这到底是什么问题。百度了好久试了好多方法还是不行！求大佬帮忙看看到底那里问题！

idea发布maven项目到tomcat上。为何不能在tomcat下看输出_course

看了一下日志。项目生成的文件被保存在我的C盘的user/xxx/.intelli_idea15/sstem/tomcat中,怎么才能让每次生成的文件直接在tomcat安装路径下生成。

tomcat6升级到tomcat8需要注意哪些？_course

因项目需要将tomcat6升级到tomcat8，项目用的是部署包，请问这个过程中需要注意哪些，能够防止和减少报错？

javamail 接收邮件,总是报javax.mail.NoSuchProviderException: invalid provider_course

javamail接收邮件的时候,报错误 ``` public Store createStore() throws NoSuchProviderException { Properties properties = System.getProperties(); properties.setProperty("mail.store.protocol", "smtp"); properties.setProperty("mail.smtp.host", "smtp.qq.com"); //认证连接 properties.setProperty("mail.smtp.auth", "true"); Session session = Session.getDefaultInstance(properties,null); session.setDebug(false); //创建连接邮件服务器 smtp return session.getStore(protoco); } ``` ``然后启动运行报错` javax.mail.NoSuchProviderException: invalid provider at javax.mail.Session.getStore(Session.java:655) ~[javax.mail-1.6.2.jar:1.6.2] at javax.mail.Session.getStore(Session.java:621) ~[javax.mail-1.6.2.jar:1.6.2] at javax.mail.Session.getStore(Session.java:600) ~[javax.mail-1.6.2.jar:1.6.2] at com.geely.trip.messagecenter.utils.MailUtils.createStore(MailUtils.java:80) ~[classes/:?] at com.geely.trip.messagecenter.service.EmailService.queryEmail(EmailService.java:261) ~[classes/:?] at com.geely.trip.messagecenter.service.EmailService$$FastClassBySpringCGLIB$$f966b9a6.invoke(<generated>) ~[classes/:?] at org.springframework.cglib.proxy.MethodProxy.invoke(MethodProxy.java:204) ~[spring-core-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(CglibAopProxy.java:684) ~[spring-aop-5.0.9.RELEASE.jar:5.0.9.RELEASE] at com.geely.trip.messagecenter.service.EmailService$$EnhancerBySpringCGLIB$$beacfde0.queryEmail(<generated>) ~[classes/:?] at com.geely.trip.messagecenter.controller.EmailController.queryEmail(EmailController.java:117) ~[classes/:?] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:1.8.0_181] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:1.8.0_181] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:1.8.0_181] at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_181] at org.springframework.web.method.support.InvocableHandlerMethod.doInvoke(InvocableHandlerMethod.java:209) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.web.method.support.InvocableHandlerMethod.invokeForRequest(InvocableHandlerMethod.java:136) ~[spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.ServletInvocableHandlerMethod.invokeAndHandle(ServletInvocableHandlerMethod.java:102) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.invokeHandlerMethod(RequestMappingHandlerAdapter.java:891) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.web.servlet.mvc.method.annotation.RequestMappingHandlerAdapter.handleInternal(RequestMappingHandlerAdapter.java:797) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.web.servlet.mvc.method.AbstractHandlerMethodAdapter.handle(AbstractHandlerMethodAdapter.java:87) ~[spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:991) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:925) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:974) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:866) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:687) [javax.servlet-api-3.1.0.jar:3.1.0] at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:851) [spring-webmvc-5.0.9.RELEASE.jar:5.0.9.RELEASE] at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) [javax.servlet-api-3.1.0.jar:3.1.0] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:231) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) [tomcat-embed-websocket-8.5.34.jar:8.5.34] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34] at com.alibaba.druid.support.http.WebStatFilter.doFilter(WebStatFilter.java:123) [druid-1.1.9.jar:1.1.9] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.springframework.boot.actuate.web.trace.servlet.HttpTraceFilter.doFilterInternal(HttpTraceFilter.java:90) [spring-boot-actuator-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.springframework.web.filter.RequestContextFilter.doFilterInternal(RequestContextFilter.java:99) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.springframework.web.filter.HttpPutFormContentFilter.doFilterInternal(HttpPutFormContentFilter.java:109) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.springframework.web.filter.HiddenHttpMethodFilter.doFilterInternal(HiddenHttpMethodFilter.java:93) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.springframework.cloud.sleuth.instrument.web.ExceptionLoggingFilter.doFilter(ExceptionLoggingFilter.java:48) [spring-cloud-sleuth-core-2.0.1.RELEASE.jar:2.0.1.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34] at brave.servlet.TracingFilter.doFilter(TracingFilter.java:86) [brave-instrumentation-servlet-5.1.4.jar:?] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:155) [spring-boot-actuator-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.filterAndRecordMetrics(WebMvcMetricsFilter.java:123) [spring-boot-actuator-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.springframework.boot.actuate.metrics.web.servlet.WebMvcMetricsFilter.doFilterInternal(WebMvcMetricsFilter.java:108) [spring-boot-actuator-2.0.5.RELEASE.jar:2.0.5.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:200) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107) [spring-web-5.0.9.RELEASE.jar:5.0.9.RELEASE] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:193) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:166) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:198) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:96) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:493) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:140) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:81) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:87) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:342) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:800) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:66) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:806) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1498) [tomcat-embed-core-8.5.34.jar:8.5.34] at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:49) [tomcat-embed-core-8.5.34.jar:8.5.34] at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [?:1.8.0_181] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [?:1.8.0_181] at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) [tomcat-embed-core-8.5.34.jar:8.5.34] at java.lang.Thread.run(Thread.java:748) [?:1.8.0_181] 2019-03-13 19:12:55 [ http-nio-9002-exec-3:21999 ] - [ WARN ] org.springframework.web.servlet.handler.AbstractHandlerExceptionResolver.resolveException(AbstractHandlerExceptionResolver.java:140) Resolved [javax.mail.NoSuchProviderException: invalid provider] 2019-03-13 19:13:12,314 INFO [Thread-30] server.JettyServer$1 (JettyServer.java:56) - >>>>>>>>>>> xxl-rpc server join success, netcon=com.xxl.job.core.rpc.netcom.jetty.server.JettyServer, port=9992 2019-03-13 19:17:47,162 INFO [AsyncResolver-bootstrap-executor-0] aws.ConfigClusterResolver (ConfigClusterResolver.java:43) - Resolving eureka endpoints via configuration 2019-03-13 19:18:06 [ http-nio-9002-exec-4:333136 ] - [ INFO ] org.springframework.cloud.config.client.ConfigServicePropertySourceLocator.getRemoteEnvironment(ConfigServicePropertySourceLocator.java:205) Fetching config from server at : http://10.86.216.184:8083/ 2019-03-13 19:18:06 [ http-nio-9002-exec-4:333501 ] - [ INFO ] org.springframework.cloud.config.client.ConfigServicePropertySourceLocator.log(ConfigServicePropertySourceLocator.java:149) Located environment: name=messagecenterxzy-v06, profiles=[localhost], label=master, version=47f76ee9b39bcda0ea0907280f06820b80e127de, state=null 2019-03-13 19:22:47,167 INFO [AsyncResolver-bootstrap-executor-0] aws.ConfigClusterResolver (ConfigClusterResolver.java:43) - Resolving eureka endpoints via configuration 2019-03-13 19:23:26 [ http-nio-9002-exec-8:653135 ] - [ INFO ] org.springframework.cloud.config.client.ConfigServicePropertySourceLocator.getRemoteEnvironment(ConfigServicePropertySourceLocator.java:205) Fetching config from server at : http://10.86.216.184:8083/ 2019-03-13 19:23:26 [ http-nio-9002-exec-8:653453 ] - [ INFO ] org.springframework.cloud.config.client.ConfigServicePropertySourceLocator.log(ConfigServicePropertySourceLocator.java:149) Located environment: name=messagecenterxzy-v06, profiles=[localhost], label=master, version=47f76ee9b39bcda0ea0907280f06820b80e127de, state=null 2019-03-13 19:27:47,169 INFO [AsyncResolver-bootstrap-executor-0] aws.ConfigClusterResolver (ConfigClusterResolver.java:43) - Resolving eureka endpoints via configuration 2019-03-13 19:28:46 [ http-nio-9002-exec-5:973135 ] - [ INFO ] org.springframework.cloud.config.client.ConfigServicePropertySourceLocator.getRemoteEnvironment(ConfigServicePropertySourceLocator.java:205) Fetching config from server at : http://10.86.216.184:8083/ 2019-03-13 19:28:46 [ http-nio-9002-exec-5:973441 ] - [ INFO ] org.springframework.cloud.config.client.ConfigServicePropertySourceLocator.log(ConfigServicePropertySourceLocator.java:149) Located environment: name=messagecenterxzy-v06, profiles=[localhost], label=master, version=47f76ee9b39bcda0ea0907280f06820b80e127de, state=null ``` ``` ```

阿里云 Java环境 每小时在根目录下生成 hs_err_pid*.log ，求教！_course

OS环境：阿里云 1核 1G内存； 安装软件：安装了 JDK 1.7 TOMCAT 7.X； 部署内容：部署了 java web 工程，工程正常运行； 问题：每小时在跟目录下生成一个 hs_err_pid<pid>.log 已经采取的措施： 1、配置服务器Swap 2、配置tomcat jvm 内存 （bin/catalina.sh） 未果，求牛人指点。 文件内容如下： # # There is insufficient memory for the Java Runtime Environment to continue. # pthread_getattr_np # Possible reasons: # The system is out of physical RAM or swap space # In 32 bit mode, the process size limit was hit # Possible solutions: # Reduce memory load on the system # Increase physical memory or swap space # Check if swap backing store is full # Use 64 bit Java on a 64 bit OS # Decrease Java heap size (-Xmx/-Xms) # Decrease number of Java threads # Decrease Java thread stack sizes (-Xss) # Set larger code cache with -XX:ReservedCodeCacheSize= # This output file may be truncated or incomplete. # # Out of Memory Error (os_linux_x86.cpp:718), pid=29229, tid=140505843455744 # # JRE version: Java(TM) SE Runtime Environment (7.0_67-b01) (build 1.7.0_67-b01) # Java VM: Java HotSpot(TM) 64-Bit Server VM (24.65-b04 mixed mode linux-amd64 compressed oops) # Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again # --------------- T H R E A D --------------- Current thread (0x00007fca0c08a800): JavaThread "Service Thread" daemon [_thread_new, id=29237, stack(0x0000000000000000,0x0000000000000000)] Stack: [0x0000000000000000,0x0000000000000000], sp=0x00007fca10e34880, free space=137212737746k Native frames: (J=compiled Java code, j=interpreted, Vv=VM code, C=native code) V [libjvm.so+0x99eb8a] V [libjvm.so+0x49721b] V [libjvm.so+0x8237ca] V [libjvm.so+0x823815] V [libjvm.so+0x952614] V [libjvm.so+0x958dd4] V [libjvm.so+0x81f988] --------------- P R O C E S S --------------- Java Threads: ( => current thread ) =>0x00007fca0c08a800 JavaThread "Service Thread" daemon [_thread_new, id=29237, stack(0x0000000000000000,0x0000000000000000)] 0x00007fca0c088000 JavaThread "C2 CompilerThread1" daemon [_thread_blocked, id=29236, stack(0x00007fca10e36000,0x00007fca10f37000)] 0x00007fca0c085800 JavaThread "C2 CompilerThread0" daemon [_thread_blocked, id=29235, stack(0x00007fca10f37000,0x00007fca11038000)] 0x00007fca0c084000 JavaThread "Signal Dispatcher" daemon [_thread_blocked, id=29234, stack(0x00007fca11038000,0x00007fca11139000)] 0x00007fca0c064800 JavaThread "Finalizer" daemon [_thread_blocked, id=29233, stack(0x00007fca11139000,0x00007fca1123a000)] 0x00007fca0c062800 JavaThread "Reference Handler" daemon [_thread_blocked, id=29232, stack(0x00007fca1123a000,0x00007fca1133b000)] 0x00007fca0c008800 JavaThread "main" [_thread_in_vm, id=29230, stack(0x00007fca12195000,0x00007fca12296000)] Other Threads: 0x00007fca0c05e000 VMThread [stack: 0x00007fca1133b000,0x00007fca1143c000] [id=29231] VM state:not at safepoint (normal execution) VM Mutex/Monitor currently owned by a thread: ([mutex/lock_event]) [0x00007fca0c006bc0] PeriodicTask_lock - owner thread: 0x00007fca0c008800 Heap def new generation total 4800K, used 343K [0x00000000eb400000, 0x00000000eb930000, 0x00000000f0750000) eden space 4288K, 8% used [0x00000000eb400000, 0x00000000eb455e40, 0x00000000eb830000) from space 512K, 0% used [0x00000000eb830000, 0x00000000eb830000, 0x00000000eb8b0000) to space 512K, 0% used [0x00000000eb8b0000, 0x00000000eb8b0000, 0x00000000eb930000) tenured generation total 10624K, used 0K [0x00000000f0750000, 0x00000000f11b0000, 0x00000000fae00000) the space 10624K, 0% used [0x00000000f0750000, 0x00000000f0750000, 0x00000000f0750200, 0x00000000f11b0000) compacting perm gen total 21248K, used 2132K [0x00000000fae00000, 0x00000000fc2c0000, 0x0000000100000000) the space 21248K, 10% used [0x00000000fae00000, 0x00000000fb015148, 0x00000000fb015200, 0x00000000fc2c0000) No shared spaces configured. Card table byte_map: [0x00007fca117bd000,0x00007fca11864000] byte_map_base: 0x00007fca11063000 Polling page: 0x00007fca1332b000 Code Cache [0x00007fca09000000, 0x00007fca09270000, 0x00007fca0c000000) total_blobs=156 nmethods=0 adapters=126 free_code_cache=48779Kb largest_free_block=49950080 Compilation events (0 events): No events GC Heap History (0 events): No events Deoptimization events (0 events): No events Internal exceptions (1 events): Event: 0.027 Thread 0x00007fca0c008800 Threw 0x00000000eb410380 at /HUDSON/workspace/7u-2-build-linux-amd64/jdk7u67/1368/hotspot/src/share/vm/prims/jni.cpp:3991 Events (10 events): Event: 0.058 loading class 0x00007fca11701880 Event: 0.058 loading class 0x00007fca11701880 done Event: 0.058 loading class 0x00007fca1170df80 Event: 0.058 loading class 0x00007fca1170df80 done Event: 0.058 loading class 0x00007fca116c8ee0 Event: 0.058 loading class 0x00007fca116c8ee0 done Event: 0.058 Thread 0x00007fca0c084000 Thread added: 0x00007fca0c084000 Event: 0.058 Thread 0x00007fca0c085800 Thread added: 0x00007fca0c085800 Event: 0.059 Thread 0x00007fca0c088000 Thread added: 0x00007fca0c088000 Event: 0.059 Thread 0x00007fca0c08a800 Thread added: 0x00007fca0c08a800 .....

Myeclipse发布项目到tomcat7.0服务器上报错，无法发布_course

An internal error occurred during: "Launching day19_2 on Tomcat 7.x". Container with path org.eclipse.jdt.launching.JRE_CONTAINER/org.eclipse.jdt.internal.debug.ui.launcher.StandardVMType/jdk1.7.0_72 could not be found in project day19_2   

关于 No suitable driver问题，问题已经解决，但问题本身很奇怪_course

这个问题之前有过发生，但我都没较真，解决就过去了，但今天认真对比了下发现很奇怪。望大神帮助指点 先说问题： 项目为maven 的 spring mvc+mybatis框架，本地运行了一下后，去tomcat下打包，上传服务器 ，上传后，修改jdbc.properties文件，更改数据库。 之后tomcat正常启动，登录页面正常打开（未访问DB的页面），登录后，开始报错： No suitable driver 。 按网上的说法一一尝试皆无效。 本地服务远程连接DB无问题运行。 后来解决方法：把本地跑的布署项目包直接上传服务器，OK。 返回查问题根本原因。**发现不能远程修改jdbc.properties文件只要动一下就报no suitable driver错误。复制本地的过去就没问题。文字一模一样。** 另外： 本地文件编辑在eclipse中编辑，编码utf-8。 服务器上用的记事本。 我有点怀疑是系统底层编码问题，但实在无头绪理清，在此求教大神帮忙~

java web 项目开发中的文件上传与下载使用什么方式？_course

场景: 把文件上传到tomcat服务器的webapp中，把上传的文件url提供给其他应用或当前应用调用。 问题: 文件保存的路径应该在哪里？要建虚拟目录吗？表单提交后才上传到服务器？ 我写的部分代码： // 输出 ： /项目名 String getContextPath = request.getSession().getServletContext().getContextPath(); // 去除/ String getContextName = request.getSession().getServletContext().getContextPath().substring(1,getContextPath.length()); System.out.println(realpath); if(realpath2!=null){ int nIndex = realpath2.indexOf(getContextName); realpath2 = realpath2.substring(0,nIndex)+"/Images"; System.out.println(realpath2);//D:\Program Files\apache-tomcat-7.0.55\webapps\/Images }

mysql8.0跟tomcat7.0有冲突吗_course

我用mysql8.0+mysql-connector-java-8.0.15+jdk1.8能通过jdbc访问数据库，但是将服务部署到tomcat7.0服务器时出错，初步认定是没能成功访问数据库，报错信息如下： 严重: Servlet.service() for servlet [LoginServlet] in context with path [/day0513] threw exception [Servlet execution threw an exception] with root cause java.lang.UnsupportedClassVersionError: com/mysql/cj/jdbc/Driver : Unsupported major.minor version 52.0 (unable to load class com.mysql.cj.jdbc.Driver) ``` at org.apache.catalina.loader.WebappClassLoaderBase.findClassInternal(WebappClassLoaderBase.java:3255) at org.apache.catalina.loader.WebappClassLoaderBase.findClass(WebappClassLoaderBase.java:1420) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1924) at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1798) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:190) at com.fubr.dao.Dao.getUserByUsernameAndPwd(Dao.java:14) at com.fubr.service.UserService.login(UserService.java:24) at com.fubr.servlet.LoginServlet.doPost(LoginServlet.java:25) at javax.servlet.http.HttpServlet.service(HttpServlet.java:650) at javax.servlet.http.HttpServlet.service(HttpServlet.java:731) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:110) at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:494) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:104) at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:1025) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:445) at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1137) at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:637) at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:317) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) at java.lang.Thread.run(Thread.java:744) ``` 求大神解答，在线等

安卓项目客户端服务端服务器搞不懂_course

第一次设计服务器，我在做毕业设计，模仿百度贴吧也做个贴吧，手机客户端的界面都做好了，可是需要服务端，遇到好几个问题，求大神们解答下： 1.我要做后台服务端来管理，那就需要服务器，服务器是用tomcat是吗？ 2.客户端和服务端要分开为两个工程吗，两个工程怎么响应？ 3.我用eclipse java ee来做，不用MyEclipse可以吗？ 4.我下载了一个简单的有客户端和服务端的项目做例子，可要怎么运行这个项目额？ 5.数据库是不用写在客户端，是写在服务端吗？ 求大神们解答，拜托拜托！！！

springboot整合springcloud能承载的最大并发数是多少？？？？_course

springboot整合springcloud能承载的最大并发数是多少？？？？

web项目如何发布在外网服务器上，让所有有网络的人可以访问该项目_course

希望各位前辈帮帮忙，我是一名大学生，做了一个项目，有一个服务器的固定IP地址，然后 能远程控制服务器，我将jdk、Tomcat、都安装在服务器上面了，也配好了各自的环境 变量，现在就是在服务器中发布了项目，在其他局域网不能访问，这是为什么，求各位 前辈给一个方法，服务器是Windows、

eclipse中启动Tomcat无法访问我自己的JSP文件_course

我在eclipse中启动Tomcat8.5之后，运行maven-webapp项目下的JSP文件，总是报404错误，但是访问http://localhost:8080/地址却可以正常访问，请问是怎么回事啊？ 补充：server中的server locations已经改成了 use Tomcat installation deploy path 里面也改成了 webspps

Linux系统Tomcat上运行的JAVAEE项目log4j日志异常_course

我部署在Linux系统上的JAVAEE项目正常运行的某一天开始，日志突然就不在文本上打印出来了，但在客户端上程序还是正常运行，只是无日志记录。并且日志文本文件还是存在，只是为空且会有时间的更新。如图日志内容，日志配置：大神们，log4j框架有什么bug吗？还是因为其他原因，请大神分析！！！服务器正常运行，未停止过服务器，也未修改过代码。

现在springcloud项目推荐是用jar还是war，还需不需要搭自己的tomcat，为什么？_course

现在springcloud项目推荐是用jar还是war，还需不需要搭自己的tomcat，为什么？

关于web服务器的一个疑问，谢谢大家_course

看到一段话，”虽然Web服务器不支持事务处理或数据库连接池，但它可以配置(employ)各种策略(strategies)来实现容错性(fault tolerance)和可扩展性(scalability)......“，我有个疑问，我们常用的tomcat服务器不就支持事务处理和数据库连接池吗？还是我的理解有问题呢？？谢谢大家