eclipse - Could not publish to the server. java.lang.NullPointerException in Tomcat v8.0 Server - Stack Overflow
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While Developing Project I got this Error.I used Eclipse Mars and Tomcat v8.0 Server.Actually upto last Night it works good but next morning it shows this error block.Nothing to be displayed in console, Error is just display on pop up window.I didn't get proper solution,So please help me to solve this error
java.lang.NullPointerException
at org.mon.internal.modulecore.IgnoreJavaInSourceFolderParticipant.shouldAddExportableFile(IgnoreJavaInSourceFolderParticipant.java:64)
at org.ponentcore.internal.flat.FlatVirtualComponent.shouldAddComponentFile(FlatVirtualComponent.java:288)
at org.ponentcore.internal.flat.VirtualComponentFlattenUtility.addFile(VirtualComponentFlattenUtility.java:122)
at org.ponentcore.internal.flat.VirtualComponentFlattenUtility.addMembersInternal(VirtualComponentFlattenUtility.java:99)
at org.ponentcore.internal.flat.VirtualComponentFlattenUtility.addMembersInternal(VirtualComponentFlattenUtility.java:96)
at org.ponentcore.internal.flat.VirtualComponentFlattenUtility.addMembers(VirtualComponentFlattenUtility.java:51)
at org.ponentcore.internal.flat.FlatVirtualComponent.treeWalk(FlatVirtualComponent.java:230)
at org.ponentcore.internal.flat.FlatVirtualComponent.cacheResources(FlatVirtualComponent.java:188)
at org.ponentcore.internal.flat.FlatVirtualComponent.fetchResources(FlatVirtualComponent.java:118)
at org.eclipse.wst.web.internal.deployables.FlatComponentDeployable.members(FlatComponentDeployable.java:227)
at org.eclipse.jst.j2ee.internal.deployables.J2EEFlexProjDeployable.members(J2EEFlexProjDeployable.java:267)
at org.eclipse.wst.server.core.internal.ModulePublishInfo.fillCache(ModulePublishInfo.java:314)
at org.eclipse.wst.server.core.internal.ModulePublishInfo.getDelta(ModulePublishInfo.java:396)
at org.eclipse.wst.server.core.internal.ServerPublishInfo.getDelta(ServerPublishInfo.java:366)
at org.eclipse.wst.server.core.internal.Server.getPublishedResourceDelta(Server.java:1578)
at org.eclipse.wst.server.core.model.ServerBehaviourDelegate.getPublishedResourceDelta(ServerBehaviourDelegate.java:698)
at org.eclipse.jst.server.tomcat.core.internal.TomcatServerBehaviour.getPublishedResourceDelta(TomcatServerBehaviour.java:958)
at org.eclipse.wst.server.core.puteDelta(ServerBehaviourDelegate.java:874)
at org.eclipse.wst.server.core.model.ServerBehaviourDelegate.publish(ServerBehaviourDelegate.java:909)
at org.eclipse.wst.server.core.model.ServerBehaviourDelegate.publish(ServerBehaviourDelegate.java:774)
at org.eclipse.wst.server.core.internal.Server.publishImpl(Server.java:3172)
at org.eclipse.wst.server.core.internal.Server$PublishJob.run(Server.java:345)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
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Eclipse（38）
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错误信息：publishing to tomcat v8.0 server at localhost has encontered a problemCould not publish to the server. java.lang.NullPointerException产生错误的操作：解决方法：1、找到Tomcat的配置文件“context.xml”，在Context标签中添加两个属性（&reloadable=true” privileged=true”），如下图：2、加完保存之后，重新启动Eclipse，否则不生效。重新启动Eclipse之后，问题就解决了；但再查看Context.xml文件会发现两个属性又被去掉了。其它方法以下方法我没有实际测试过，如果你通过上面的方法不能解决问题，可以考虑尝试下面的方法：解决方案：Removed the project from the workspaceRemove .classpath, .project and .settings folderReimport the projectMaven项目解决：Removed the project from the workspaceCMD：mvn eclipse:cleanRemove .settings folderCMD：mvn eclipse:eclipseReimport the project
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&&& 这是在启动tomcat的web应用的时候就报错，因为这个错误是不定期出现的，所以很难扑捉到。在网上搜索了一下相关的解决方案，但是也没有解决问题。大侠们，给帮忙解决一下吧！！！小女，谢过哦！！！！！
16:40:23,304 WARN [org.hibernate.util.JDBCExceptionReporter-logExceptions] - &SQL Error: 0, SQLState: null&
16:40:23,330 ERROR [org.hibernate.util.JDBCExceptionReporter-logExceptions] - &An attempt by a client to checkout a Connection has timed out.&
16:40:23,344 WARN [org.hibernate.cfg.SettingsFactory-buildSettings] - &Could not obtain connection metadata&
java.sql.SQLException: An attempt by a client to checkout a Connection has timed out.
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:106)
at com.mchange.v2.sql.SqlUtils.toSQLException(SqlUtils.java:65)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:527)
at com.mchange.v2.c3p0.impl.AbstractPoolBackedDataSource.getConnection(AbstractPoolBackedDataSource.java:128)
at org.springframework.orm.hibernate3.LocalDataSourceConnectionProvider.getConnection(LocalDataSourceConnectionProvider.java:81)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:84)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2073)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1298)
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.newSessionFactory(LocalSessionFactoryBean.java:805)
at org.springframework.orm.hibernate3.LocalSessionFactoryBean.buildSessionFactory(LocalSessionFactoryBean.java:745)
at org.springframework.orm.hibernate3.AbstractSessionFactoryBean.afterPropertiesSet(AbstractSessionFactoryBean.java:134)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1143)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1110)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:431)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:254)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:144)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:251)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:163)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:271)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:128)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1047)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:843)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:427)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:254)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:144)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:251)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:163)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveReference(BeanDefinitionValueResolver.java:271)
at org.springframework.beans.factory.support.BeanDefinitionValueResolver.resolveValueIfNecessary(BeanDefinitionValueResolver.java:128)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1047)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:843)
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:427)
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:254)
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:144)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:251)
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:163)
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:284)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:352)
at org.springframework.web.context.ContextLoader.createWebApplicationContext(ContextLoader.java:241)
at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:184)
at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:49)
at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3972)
at org.apache.catalina.core.StandardContext.start(StandardContext.java:4467)
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:546)
at org.apache.catalina.startup.HostConfig.deployDirectory(HostConfig.java:1041)
at org.apache.catalina.startup.HostConfig.deployDirectories(HostConfig.java:964)
at org.apache.catalina.startup.HostConfig.deployApps(HostConfig.java:502)
at org.apache.catalina.startup.HostConfig.start(HostConfig.java:1277)
at org.apache.catalina.startup.HostConfig.lifecycleEvent(HostConfig.java:321)
at org.apache.catalina.util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:119)
at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1053)
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:443)
at org.apache.catalina.core.StandardService.start(StandardService.java:519)
at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
at org.apache.catalina.startup.Catalina.start(Catalina.java:581)
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:289)
at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:414)
Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from com.mchange.v2.resourcepool.BasicResourcePool@199dcfe -- timeout at awaitAvailable()
at com.mchange.v2.resourcepool.BasicResourcePool.awaitAvailable(BasicResourcePool.java:1317)
at com.mchange.v2.resourcepool.BasicResourcePool.prelimCheckoutResource(BasicResourcePool.java:557)
at com.mchange.v2.resourcepool.BasicResourcePool.checkoutResource(BasicResourcePool.java:477)
at com.mchange.v2.c3p0.impl.C3P0PooledConnectionPool.checkoutPooledConnection(C3P0PooledConnectionPool.java:525)
... 62 more
问题补充：crud0906 写道数据库连接超时，没连上数据库服务器
是啊，但是不知道怎么解决这问题呀，我怕发布到客户端服务器之后，客户访问的时候也会出现这样的错误。
问题补充：7454103 写道引用Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from
个人猜测应该是你们的 JDBC连接池 初始化 失败！
网咯不稳定 或者其他 导致的！具体情况还得靠你们自己哦！
有没有具体的解决办法呀，我问了几位同事都解决不了。谢啦
问题补充：crud0906 写道引用问题补充：
crud0906 写道
数据库连接超时，没连上数据库服务器
是啊，但是不知道怎么解决这问题呀，我怕发布到客户端服务器之后，客户访问的时候也会出现这样的错误。
只要数据库连接池信息配置对了，数据库服务器不挂掉，就不会出问题
通过查看客户端tomcat服务器的日志，有时候也可以发现会有同样的错误信息，但是并不影响客户端的操作。只是感觉有时候会报错，看到错误信息心里不舒畅，就想解决掉它。恩，谢谢您的回答！
采纳的答案
引用Caused by: com.mchange.v2.resourcepool.TimeoutException: A client timed out while waiting to acquire a resource from
个人猜测应该是你们的 JDBC连接池 初始化 失败！
网咯不稳定 或者其他 导致的！具体情况还得靠你们自己哦！
美女我也出现同样的问题！希望能give me your hand！
QQ
可以换个新版的Tomcat试一试。
引用问题补充：
crud0906 写道
数据库连接超时，没连上数据库服务器
是啊，但是不知道怎么解决这问题呀，我怕发布到客户端服务器之后，客户访问的时候也会出现这样的错误。
只要数据库连接池信息配置对了，数据库服务器不挂掉，就不会出问题
数据库连接超时，没连上数据库服务器
已解决问题
未解决问题