Java 在bluemix liberty上调试web应用中的文件描述符泄漏
我有一个在bluemix liberty上运行的web应用程序。If提供了一个restapi，它通过jdbc从db2实例检索信息。我观察到，大约7天后，我所有的RESTAPI查询都失败了。查看日志，我看到DriverManager.getConnection方法引发NoClassDef异常。ffdc异常摘要文件还有一个关联的FileNotFound异常（原因是“打开的文件太多”），导致无法写入该文件。摘录自底部包含的messages.log 查看我的代码，我发现我并没有在一个RESTAPI请求中关闭jdbc连接，该请求在过去7天中每5分钟调用一次。这是否会导致wlp服务器的打开文件描述符超过限制（限制约为16000） 我尝试了以下步骤来验证这一点：Java 在bluemix liberty上调试web应用中的文件描述符泄漏,java,jdbc,db2,ibm-cloud,websphere-liberty,Java,Jdbc,Db2,Ibm Cloud,Websphere Liberty,我有一个在bluemix liberty上运行的web应用程序。If提供了一个restapi，它通过jdbc从db2实例检索信息。我观察到，大约7天后，我所有的RESTAPI查询都失败了。查看日志，我看到DriverManager.getConnection方法引发NoClassDef异常。ffdc异常摘要文件还有一个关联的FileNotFound异常（原因是“打开的文件太多”），导致无法写入该文件。摘录自底部包含的messages.log 查看我的代码，我发现我并没有在一个RESTAPI请求中
[2/9/16 3:00:11:773 GMT] 0000fd52 com.ibm.ws.webcontainer.util.ApplicationErrorUtils E SRVE0777E: Exception thrown by application class 'org..apache.wink.server.internal.RequestProcessor.handleRequest:195'
javax.servlet.ServletException: java.lang.NoClassDefFoundError: com/ibm/db2/jcc/am/uo
at org.apache.wink.server.internal.RequestProcessor.handleRequest(RequestProcessor.java:195)
at com.ibm.websphere.jaxrs.server.IBMRestServlet..service(IBMRestServlet.java:107)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:668)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1287)
at com.ibm.ws.webcontainer.servlet..ServletWrapper.handleRequest(ServletWrapper.java:778)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.handleRequest(ServletWrapper.java:475)
at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1161)
at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:81)
at com.ibm.ws.webcontainer.WebContainer.handleRequest(WebContainer.java:928)
at com.ibm.ws.webcontainer.osgi.DynamicVirtualHost$2.run(DynamicVirtualHost.java:262)
at com.ibm.ws.http.dispatcher.internal.channel.HttpDispatcherLink$TaskWrapper.run(HttpDispatcherLink.java:955)
at com.ibm.ws.http.dispatcher.internal.channel.HttpDispatcherLink.ready(HttpDispatcherLink.java:341)
at com.ibm..ws.http.channel.internal.inbound.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:470)
at com.ibm.ws.http.channel.internal.inbound.HttpInboundLink.handleNewRequest(HttpInboundLink.java:404)
at com.ibm.ws.http.channel.internal.inbound.HttpInboundLink.processRequest(HttpInboundLink.java:284)
at com.ibm.ws.http.channel.internal.inbound.HttpInboundLink.ready(HttpInboundLink.java:255)
at com.ibm.ws.tcpchannel.internal.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback..java:174)
at com.ibm.ws.tcpchannel.internal.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:83)
at com.ibm.ws.tcpchannel.internal.WorkQueueManager.requestComplete(WorkQueueManager.java:504)
at com.ibm.ws.tcpchannel.internal.WorkQueueManager.attemptIO(WorkQueueManager.java:574)
at com.ibm.ws.tcpchannel.internal.WorkQueueManager.workerRun(WorkQueueManager.java:929)
at com.ibm.ws.tcpchannel.internal.WorkQueueManager$Worker.run(WorkQueueManager.java:1018)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoClassDefFoundError: com/ibm/db2/jcc/am/uo
at com.ibm.db2.jcc.t4.xb.a(xb.java:433)
at com.ibm.db2.jcc.t4.xb.<init>(xb.java:90)
at com.ibm.db2.jcc.t4.a.z(a.java:347)
at com.ibm.db2.jcc.t4.b.a(b.java:1974)
at com.ibm.db2.jcc.am.ib.a(ib.java:691)
at com.ibm.db2.jcc.am.ib.<init>(ib.java:644)
at com.ibm.db2.jcc.t4.b..<init>(b.java:330)
at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(DB2SimpleDataSource.java:231)
at com.ibm.db2.jcc.DB2SimpleDataSource.getConnection(DB2SimpleDataSource.java:197)
at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:472)
at com.ibm.db2.jcc.DB2Driver.connect(DB2Driver.java:113)
at java.sql.DriverManager.getConnection(Unknown Source)
at java.sql.DriverManager.getConnection(Unknown Source)
at com.ibm.biginsights.bluemix.infra.util.RepositoryHelper.getConnection(RepositoryHelper.java:58)
at com.ibm.biginsights.bluemix.infra.dao.JdbcDAOFactoryImpl.initConnection(JdbcDAOFactoryImpl.java:39)
at com.ibm.biginsights.bluemix.infra.pojo.MonitoringAPI.getStatus(MonitoringAPI.java:48)
at com.ibm.biginsights.bluemix.infra.rest.MonitoringService.getStats(MonitoringService.java:53)
at sun.reflect.GeneratedMethodAccessor82.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.wink.server.internal.handlers.InvokeMethodHandler.handleRequest(InvokeMethodHandler.java:63)
at org.apache.wink.server.handlers.AbstractHandler.handleRequest(AbstractHandler.java:33)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.handlers.CreateInvocationParametersHandler.handleRequest(CreateInvocationParametersHandler.java:54)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.handlers.AbstractHandler.handleRequest(AbstractHandler.java:34)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.handlers.FindResourceMethodHandler.handleResourceMethod(FindResourceMethodHandler.java:151)
at org.apache.wink.server.internal.handlers.FindResourceMethodHandler.handleRequest(FindResourceMethodHandler.java:65)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.handlers.FindRootResourceHandler.handleRequest(FindRootResourceHandler.java:95)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink..server.internal.handlers.HeadMethodHandler.handleRequest(HeadMethodHandler..java:53)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.handlers.OptionsMethodWADLHandler.handleRequest(OptionsMethodWADLHandler.java:51)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.handlers.SearchResultHandler.handleRequest(SearchResultHandler.java:33)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.log.ResourceInvocation.handleRequest(ResourceInvocation.java:92)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.internal.log.Requests.handleRequest(Requests.java:76)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:26)
at org.apache.wink.server.handlers.RequestHandlersChain.handle(RequestHandlersChain.java:22)
at org.apache.wink.server.handlers.AbstractHandlersChain.doChain(AbstractHandlersChain.java:75)
at org.apache.wink.server.handlers.AbstractHandlersChain.run(AbstractHandlersChain.java:60)
at org.apache.wink.server.internal.RequestProcessor.handleRequestWithoutFaultBarrier(RequestProcessor.java:207)
at org..apache.wink.server.internal.RequestProcessor.handleRequest(RequestProcessor.java:154)
... 24 more
[2/9/16 3:00:11:774 GMT] 0000fd52 SystemErr R java.io.FileNotFoundException: ../../../../../logs/ffdc/exception_summary_16.02.05_08.25.38.0.log (Too many open files)
[2/9/16 3:00:11:774 GMT] 0000fd52 SystemErr R at java.io.FileOutputStream.open0(Native Method)
[2/9/16 3:00:11:775 GMT] 0000fd52 SystemErr R at java.io.FileOutputStream.open(Unknown Source)
[2/9/16 3:00:11:775 GMT] 0000fd52 SystemErr R at java.io.FileOutputStream.<init>(Unknown Source)
[2/9/16 3:00:11:775 GMT] 0000fd52 SystemErr R at java.io.FileOutputStream.<init>(Unknown Source)
[2/9/16 3:00:11:775 GMT] 0000fd52 SystemErr R at com.ibm.ws.kernel..boot.logging.DefaultFileStreamFactory.createOutputStream(DefaultFileStreamFactory.java:28)
[2/9/16 3:00:11:775 GMT] 0000fd52 SystemErr R at com.ibm.ws.kernel.boot.logging..TextFileOutputStreamFactory.createOutputStream(TextFileOutputStreamFactory..java:66)
[2/9/16 3:00:11:775 GMT] 0000fd52 SystemErr R at com.ibm.ws.kernel.launch.internal.LauncherDelegateImpl$1.createOutputStream(LauncherDelegateImpl.java:59)
[2/9/16 3:00:11:776 GMT] 0000fd52 SystemErr R at com.ibm.ws.logging.internal.impl.BaseFFDCService.createSummaryStream(BaseFFDCService.java:430)
[2/9/16 3:00:11:776 GMT] 0000fd52 SystemErr R at com.ibm.ws.logging.internal.impl.BaseFFDCService.logSummary(BaseFFDCService.java:300)
[2/9/16 3:00:11:776 GMT] 0000fd52 SystemErr R at com.ibm.ws.logging.internal.impl.BaseFFDCService.logSummary(BaseFFDCService.java:274)
[2/9/16 3:00:11:776 GMT] 0000fd52 SystemErr R at com.ibm.ws.logging.internal.impl.BaseFFDCService.log(BaseFFDCService.java:237)
[2/9/16 3:00:11:776 GMT] 0000fd52 SystemErr R at com.ibm.ws.logging.internal.impl.BaseFFDCService.processException(BaseFFDCService.java:160)
[2/9/16 3:00:11:776 GMT] 0000fd52 SystemErr R at com.ibm.ws.ffdc.FFDCFilter.processException(FFDCFilter.java:45)
[2/9/16 3:00:11:777 GMT] 0000fd52 SystemErr R at com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters(WebAppFilterManager.java:1226)
[2/9/16 3:00:11:777 GMT] 0000fd52 SystemErr R at com.ibm.ws.webcontainer.servlet.CacheServletWrapper.handleRequest(CacheServletWrapper.java:81)
[2/9/16 3:00:11:777 GMT] 0000fd52 SystemErr R at com.ibm.ws.webcontainer.WebContainer..handleRequest(WebContainer.java:928)
[2/9/16 3:00:11:777 GMT] 0000fd52 SystemErr R at com.ibm.ws.webcontainer.osgi.DynamicVirtualHost$2.run(DynamicVirtualHost.java:262)
[2/9/16 3:00:11:777 GMT] 0000fd52 SystemErr R at com.ibm.ws.http.dispatcher.internal.channel.HttpDispatcherLink$TaskWrapper.run(HttpDispatcherLink.java:955)
[2/9/16 3:00:11:777 GMT] 0000fd52 SystemErr R at com.ibm.ws.http.dispatcher.internal.channel.HttpDispatcherLink.ready(HttpDispatcherLink.java:341)
[2/9/16 3:00:11:777 GMT] 0000fd52 SystemErr R at com.ibm.ws.http.channel.internal.inbound.HttpInboundLink.handleDiscrimination(HttpInboundLink.java:470)
[2/9/16 3:00:11:778 GMT] 0000fd52 SystemErr R at com.ibm.ws.http.channel.internal.inbound.HttpInboundLink.handleNewRequest(HttpInboundLink.java:404)
[2/9/16 3:00:11:778 GMT] 0000fd52 SystemErr R at com.ibm.ws.http.channel.internal.inbound.HttpInboundLink.processRequest(HttpInboundLink.java:284)
[2/9/16 3:00:11:778 GMT] 0000fd52 SystemErr R at com.ibm.ws.http.channel.internal.inbound.HttpInboundLink.ready(HttpInboundLink.java:255)
[2/9/16 3:00:11:778 GMT] 0000fd52 SystemErr R at com.ibm.ws.tcpchannel.internal.NewConnectionInitialReadCallback.sendToDiscriminators(NewConnectionInitialReadCallback.java:174)
[2/9/16 3:00:11:778 GMT] 0000fd52 SystemErr R at com.ibm.ws.tcpchannel.internal.NewConnectionInitialReadCallback.complete(NewConnectionInitialReadCallback.java:83)
[2/9/16 3:00:11:778 GMT] 0000fd52 SystemErr R at com.ibm.ws.tcpchannel.internal.WorkQueueManager.requestComplete(WorkQueueManager.java:504)
[2/9/16 3:00:11:779 GMT] 0000fd52 SystemErr R at com.ibm.ws.tcpchannel.internal.WorkQueueManager.attemptIO(WorkQueueManager.java:574)
[2/9/16 3:00:11:779 GMT] 0000fd52 SystemErr R at com.ibm.ws.tcpchannel.internal.WorkQueueManager.workerRun(WorkQueueManager.java:929)
[2/9/16 3:00:11:779 GMT] 0000fd52 SystemErr R at com.ibm.ws.tcpchannel.internal.WorkQueueManager$Worker.run(WorkQueueManager.java:1018)
[2/9/16 3:00:11:779 GMT] 0000fd52 SystemErr R at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
[2/9/16 3:00:11:779 GMT] 0000fd52 SystemErr R at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
[2/9/16 3:00:11:779 GMT] 0000fd52 SystemErr R at java.lang.Thread.run(Unknown Source)
[2/9/16 3:00:11:773 GMT]0000fd52 com.ibm.ws.webcontainer.util.ApplicationErrorUtils E SRVE0777E:应用程序类“org..apache.wink.server.internal.RequestProcessor.HandlerRequest:195”引发的异常
javax.servlet.ServletException:java.lang.NoClassDefFoundError:com/ibm/db2/jcc/am/uo
位于org.apache.wink.server.internal.RequestProcessor.handleRequest（RequestProcessor.java:195）
位于com.ibm.websphere.jaxrs.server.IBMRestServlet..service（IBMRestServlet.java:107）
位于javax.servlet.http.HttpServlet.service（HttpServlet.java:668）
位于com.ibm.ws.webcontainer.servlet.ServletWrapper.service（ServletWrapper.java:1287）
位于com.ibm.ws.webcontainer.servlet..ServletWrapper.HandlerRequest（ServletWrapper.java:778）
位于com.ibm.ws.webcontainer.servlet.ServletWrapper.HandlerRequest（ServletWrapper.java:475）
在com.ibm.ws.webcontainer.filter.WebAppFilterManager.invokeFilters（WebAppFilterManager.java:1161）
位于com.ibm.ws.webcontainer.servlet.CacheServletWrapper.HandlerRequest（CacheServletWrapper.java:81）
位于com.ibm.ws.webcontainer.webcontainer.handleRequest（webcontainer.java:928）
位于com.ibm.ws.webcontainer.osgi.DynamicVirtualHost$2.run（DynamicVirtualHost.java:262）
位于com.ibm.ws.http.dispatcher.internal.channel.HttpDispatcherLink$TaskWrapper.run（HttpDispatcherLink.java:955）
位于com.ibm.ws.http.dispatcher.internal.channel.HttpDispatcherLink.ready（HttpDispatcherLink.java:341）
位于com.ibm..ws.http.channel.internal.inbound.HttpInboundLink.handleDiscrimination（HttpInboundLink.java:470）
位于com.ibm.ws.http.channel.internal.inbound.HttpInboundLink.handleNewRequest（HttpInboundLink.java:404）
位于com.ibm.ws.http.channel.internal.inbound.HttpInboundLink.processRequest（HttpInboundLink.java:284）
位于com.ibm.ws.http.channel.internal.inbound.HttpInboundLink.ready（HttpInboundLink.java:255）
在com.ibm.ws.tcpchannel.internal.NewConnectionInitialReadCallback.sendToDiscriminators上（NewConnectionInitialReadCallback..java:174）
在com.ibm.ws.tcpchannel.internal.NewConnectionInitialReadCallback.complete（NewConnectionInitialReadCallback.java:83）上
位于com.ibm.ws.tcpchannel.internal.WorkQueueManager.requestComplete（WorkQueueManager.java:504）
位于com.ibm.ws.tcpchannel.internal.WorkQueueManager.attemptIO（WorkQueueManager.java:574）
位于com.ibm.ws.tcpchannel.internal.WorkQueueManager.workerRun（WorkQueueManager.java:929）
位于com.ibm.ws.tcpchannel.internal.WorkQueueManager$Worker.run（WorkQueueManager.java:1018）
位于java.util.concurrent.ThreadPoolExecutor.runWorker（未知源）
位于java.util.concurrent.ThreadPoolExecutor$Worker.run（未知源）
位于java.lang.Thread.run（未知源）
原因：java.lang.NoClassDefFoundError:com/ibm/db2/jcc/am/uo
com.ibm.db2.jcc.t4.xb.a（xb.java:433）
com.ibm.db2.jcc.t4.xb.（xb.java:90）
位于com.ibm.db2.jcc.t4.a.z（a.java:347）
com.ibm.db2.jcc.t4.b.a（b.java:1974）
com.ibm.db2.jcc.am.ib.a（ib.java:691）
com.ibm.db2.jcc.am.ib.（ib.java:644）
在com.ibm.db2.jcc.t4.b…（b.java:330）
位于com.ibm.db2.jcc.DB2SimpleDataSource.getConnection（DB2SimpleDataSource.java:231）
位于com.ibm.db2.jcc.DB2SimpleDataSource.getConnection（DB2SimpleDataSource.java:197）
com.ibm.db2.jcc.DB2Driver.connect（DB2Driver.java:472）
com.ibm.db2.jcc.DB2Driver.connect（DB2Driver.java:113）
位于java.sql.DriverManager.getConnection（未知源）
位于java.sql.DriverManager.getConnection（未知源）
在com.ibm.bigdights.bluemix.infra.util.RepositoryHelper.getConnection上（RepositoryHelper.java:58）
位于com.ibm.bigdights.bluemix.infra.dao.jdbcdaofactorympl.initConnection（jdbcdaofactorympl.java:39）
在com.ibm.bigdights.bluemix.infra.pojo.MonitoringAPI.getStatus上（MonitoringAPI.java:48）
在com.ibm.bigdights.bluemix.infra.rest.MonitoringService.getStats上（MonitoringService.java:53）
位于sun.reflect.GeneratedMethodAccessor82.invoke（未知源）
在sun.reflect.DelegatingMethodAccessorImpl.invoke处（未知源）
位于java.lang.reflect.Method.invoke（未知源）
位于org.apache.wink.server.internal.handlers.InvokeMethodHandler.handleRequest（InvokeMethodHandler.java:63）
位于org.apache.wink.server.handlers.AbstractHandler.HandlerRequest（AbstractHandler.java:33）