java.net.ConnectException怎么处理？

Question

org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet [dispatcher] in context with path [/platform] threw exception [Filtered request failed.] with root cause
java.net.ConnectException: Connection refused: connect
    at java.net.DualStackPlainSocketImpl.waitForConnect(Native Method)
    at java.net.DualStackPlainSocketImpl.socketConnect(DualStackPlainSocketImpl.java:85)
    at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:350)
    at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
    at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
    at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:172)
    at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
    at java.net.Socket.connect(Socket.java:589)
    at redis.clients.jedis.Connection.connect(Connection.java:184)
    at redis.clients.jedis.BinaryClient.connect(BinaryClient.java:93)
    at redis.clients.jedis.BinaryJedis.connect(BinaryJedis.java:1767)
    at redis.clients.jedis.JedisFactory.makeObject(JedisFactory.java:106)
    at org.apache.commons.pool2.impl.GenericObjectPool.create(GenericObjectPool.java:868)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:458)
    at org.apache.commons.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:363)
    at redis.clients.util.Pool.getResource(Pool.java:49)
    at redis.clients.jedis.JedisPool.getResource(JedisPool.java:226)
    at redis.clients.jedis.JedisPool.getResource(JedisPool.java:16)
    at net.oschina.j2cache.redis.RedisPubSubClusterPolicy.publish(RedisPubSubClusterPolicy.java:146)
    at net.oschina.j2cache.redis.RedisPubSubClusterPolicy.connect(RedisPubSubClusterPolicy.java:102)
    at net.oschina.j2cache.cluster.ClusterPolicyFactory.redis(ClusterPolicyFactory.java:68)
    at net.oschina.j2cache.cluster.ClusterPolicyFactory.init(ClusterPolicyFactory.java:43)
    at net.oschina.j2cache.J2CacheBuilder.initFromConfig(J2CacheBuilder.java:119)
    at net.oschina.j2cache.J2CacheBuilder.getChannel(J2CacheBuilder.java:62)
    at net.oschina.j2cache.J2Cache.getChannel(J2Cache.java:44)
    at com.platform.cache.J2CacheUtils.<clinit>(J2CacheUtils.java:25)
    at com.platform.shiro.CluterShiroSessionDao.setShiroSession(CluterShiroSessionDao.java:57)
    at com.platform.shiro.CluterShiroSessionDao.doCreate(CluterShiroSessionDao.java:23)
    at org.apache.shiro.session.mgt.eis.AbstractSessionDAO.create(AbstractSessionDAO.java:116)
    at org.apache.shiro.session.mgt.eis.CachingSessionDAO.create(CachingSessionDAO.java:184)
    at org.apache.shiro.session.mgt.DefaultSessionManager.create(DefaultSessionManager.java:177)
    at org.apache.shiro.session.mgt.DefaultSessionManager.doCreateSession(DefaultSessionManager.java:158)
    at org.apache.shiro.session.mgt.AbstractValidatingSessionManager.createSession(AbstractValidatingSessionManager.java:136)
    at org.apache.shiro.session.mgt.AbstractNativeSessionManager.start(AbstractNativeSessionManager.java:99)
    at org.apache.shiro.mgt.SessionsSecurityManager.start(SessionsSecurityManager.java:152)
    at org.apache.shiro.subject.support.DelegatingSubject.getSession(DelegatingSubject.java:336)
    at org.apache.shiro.subject.support.DelegatingSubject.getSession(DelegatingSubject.java:312)
    at org.apache.shiro.web.util.WebUtils.saveRequest(WebUtils.java:607)
    at org.apache.shiro.web.filter.AccessControlFilter.saveRequest(AccessControlFilter.java:208)
    at org.apache.shiro.web.filter.AccessControlFilter.saveRequestAndRedirectToLogin(AccessControlFilter.java:191)
    at org.apache.shiro.web.filter.authc.FormAuthenticationFilter.onAccessDenied(FormAuthenticationFilter.java:168)
    at org.apache.shiro.web.filter.AccessControlFilter.onAccessDenied(AccessControlFilter.java:133)
    at org.apache.shiro.web.filter.AccessControlFilter.onPreHandle(AccessControlFilter.java:162)
    at org.apache.shiro.web.filter.PathMatchingFilter.isFilterChainContinued(PathMatchingFilter.java:203)
    at org.apache.shiro.web.filter.PathMatchingFilter.preHandle(PathMatchingFilter.java:178)
    at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:131)
    at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
    at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
    at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
    at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
    at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
    at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
    at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
    at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
    at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    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:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

org.apache.catalina.core.StandardWrapperValve invoke
严重: Servlet.service() for servlet [dispatcher] in context with path [/platform] threw exception [Filtered request failed.] with root cause
java.lang.NoClassDefFoundError: Could not initialize class com.platform.cache.J2CacheUtils
    at com.platform.shiro.CluterShiroSessionDao.setShiroSession(CluterShiroSessionDao.java:57)
    at com.platform.shiro.CluterShiroSessionDao.doCreate(CluterShiroSessionDao.java:23)
    at org.apache.shiro.session.mgt.eis.AbstractSessionDAO.create(AbstractSessionDAO.java:116)
    at org.apache.shiro.session.mgt.eis.CachingSessionDAO.create(CachingSessionDAO.java:184)
    at org.apache.shiro.session.mgt.DefaultSessionManager.create(DefaultSessionManager.java:177)
    at org.apache.shiro.session.mgt.DefaultSessionManager.doCreateSession(DefaultSessionManager.java:158)
    at org.apache.shiro.session.mgt.AbstractValidatingSessionManager.createSession(AbstractValidatingSessionManager.java:136)
    at org.apache.shiro.session.mgt.AbstractNativeSessionManager.start(AbstractNativeSessionManager.java:99)
    at org.apache.shiro.mgt.SessionsSecurityManager.start(SessionsSecurityManager.java:152)
    at org.apache.shiro.subject.support.DelegatingSubject.getSession(DelegatingSubject.java:336)
    at org.apache.shiro.subject.support.DelegatingSubject.getSession(DelegatingSubject.java:312)
    at org.apache.shiro.web.util.WebUtils.saveRequest(WebUtils.java:607)
    at org.apache.shiro.web.filter.AccessControlFilter.saveRequest(AccessControlFilter.java:208)
    at org.apache.shiro.web.filter.AccessControlFilter.saveRequestAndRedirectToLogin(AccessControlFilter.java:191)
    at org.apache.shiro.web.filter.authc.FormAuthenticationFilter.onAccessDenied(FormAuthenticationFilter.java:168)
    at org.apache.shiro.web.filter.AccessControlFilter.onAccessDenied(AccessControlFilter.java:133)
    at org.apache.shiro.web.filter.AccessControlFilter.onPreHandle(AccessControlFilter.java:162)
    at org.apache.shiro.web.filter.PathMatchingFilter.isFilterChainContinued(PathMatchingFilter.java:203)
    at org.apache.shiro.web.filter.PathMatchingFilter.preHandle(PathMatchingFilter.java:178)
    at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:131)
    at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
    at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
    at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:449)
    at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:365)
    at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
    at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
    at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:383)
    at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:362)
    at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:125)
    at org.springframework.web.filter.DelegatingFilterProxy.invokeDelegate(DelegatingFilterProxy.java:346)
    at org.springframework.web.filter.DelegatingFilterProxy.doFilter(DelegatingFilterProxy.java:262)
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
    at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:197)
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:107)
    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:220)
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
    at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:505)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:169)
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:956)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:436)
    at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1078)
    at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:625)
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:316)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
    at java.lang.Thread.run(Thread.java:748)

Answer 1

根据报错，可以判断请求已经被tomcat接受并开始处理，但是在装载类的时候找不到Could not initialize class com.platform.cache.J2CacheUtils，无法初始化这个类，原因基本上有以下几点：
1.在打war包的时候没有将依赖的jar包打进去
2.依赖的jar包没有被成功加载
具体可以去看下项目lib目录底下的jar包，先确认依赖包正常被加载