JSF mysql tomcat内存泄漏

我是一个基本的程序员，遇到了一个我以前没见过的bug。我使用MySQL，Tomcat 8和jsf。这里是我的应用程序（部分）：JSF mysql tomcat内存泄漏

当我写的东西到文本区并点击 “Mehet” 按钮，这使得如下：（XHTML页面）

<p:commandButton value="Mehet" 
         action="#{alvallalkozoBevitelBean.add()}" update="@form :alvallalkozoFrm" />

“alvallalkozoFrm”表格中的数据表。 Java代码：

public void add() throws SQLException { 

    String sql = "INSERT INTO alvallalkozo(Ceg_neve, Ceg_szekhelye, Kapcsolattarto_neve, Kapcsolattarto_email, Ceg_telefonsz, Ceg_megjegyzes) VALUES(?,?,?,?,?,?)"; 

    if (ds == null) 
     throw new SQLException("Datasource nem található"); 
    PreparedStatement ps = null; 
    Connection con = ds.getConnection(); 
    if (con == null) 
     throw new SQLException("Nincs adatbázis kapcsolat"); 
    ps = con.prepareStatement(sql); 

    ps.setString(1, alvallalkozo.getCegNeve()); 
    ps.setString(2, alvallalkozo.getCegSzekhelye()); 
    ps.setString(3, alvallalkozo.getKapcsolattartoNeve()); 
    ps.setString(4, alvallalkozo.getKapcsolattartoEmail()); 
    ps.setString(5, alvallalkozo.getCegTelefonsz()); 
    ps.setString(6, alvallalkozo.getCegMegjegyzes()); 
    ps.executeUpdate(); 

    System.out.println("Data Added Successfully"); 
}

我可以把它添加只有7次一些数据，而当我想以增加第8个数据“Mehet”按钮，Tomcat的冻结，以及镀铬显示以下内容：

enter image description here

然后我停止Tomcat，因为我不能用它做什么，我得到下面的异常在Tomcat中：

WARNING: The web application [eDispatcher] is still processing a request that has yet to finish. This is very likely to create a memory leak. You can control the time allowed for requests to finish by using the unloadDelay attribute of the standard Context implementation. Stack trace of request processing thread: 
sun.misc.Unsafe.park(Native Method) 
java.util.concurrent.locks.LockSupport.park(Unknown Source) 
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await(Unknown Source) 
org.apache.tomcat.dbcp.pool2.impl.LinkedBlockingDeque.takeFirst(LinkedBlockingDeque.java:582) 
org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:439) 
org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:360) 
org.apache.tomcat.dbcp.dbcp2.PoolingDataSource.getConnection(PoolingDataSource.java:118) 
org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection(BasicDataSource.java:1412) 
com.dangerzone.main.IndexBean.getAlvallalkozok(IndexBean.java:51) 
sun.reflect.GeneratedMethodAccessor59.invoke(Unknown Source) 
sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) 
java.lang.reflect.Method.invoke(Unknown Source) 
javax.el.BeanELResolver.getValue(BeanELResolver.java:97) 
com.sun.faces.el.DemuxCompositeELResolver._getValue(DemuxCompositeELResolver.java:176) 
com.sun.faces.el.DemuxCompositeELResolver.getValue(DemuxCompositeELResolver.java:203) 
org.apache.el.parser.AstValue.getValue(AstValue.java:167) 
org.apache.el.ValueExpressionImpl.getValue(ValueExpressionImpl.java:184) 
com.sun.faces.facelets.el.TagValueExpression.getValue(TagValueExpression.java:109) 
javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:194) 
javax.faces.component.ComponentStateHelper.eval(ComponentStateHelper.java:182) 
javax.faces.component.UIData.getValue(UIData.java:732) 
org.primefaces.component.api.UIData.getDataModel(UIData.java:758) 
javax.faces.component.UIData.getRowCount(UIData.java:356) 
org.primefaces.component.api.UIData.calculateFirst(UIData.java:209) 
org.primefaces.component.datatable.DataTableRenderer.preRender(DataTableRenderer.java:115) 
org.primefaces.component.datatable.DataTableRenderer.encodeEnd(DataTableRenderer.java:83) 
javax.faces.component.UIComponentBase.encodeEnd(UIComponentBase.java:919) 
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1863) 
javax.faces.render.Renderer.encodeChildren(Renderer.java:176) 
javax.faces.component.UIComponentBase.encodeChildren(UIComponentBase.java:889) 
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856) 
com.sun.faces.context.PartialViewContextImpl$PhaseAwareVisitCallback.visit(PartialViewContextImpl.java:582) 
com.sun.faces.component.visit.PartialVisitContext.invokeVisitCallback(PartialVisitContext.java:183) 
javax.faces.component.UIForm.visitTree(UIForm.java:381) 
javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) 
javax.faces.component.UIComponent.visitTree(UIComponent.java:1700) 
com.sun.faces.context.PartialViewContextImpl.processComponents(PartialViewContextImpl.java:403) 
com.sun.faces.context.PartialViewContextImpl.processPartial(PartialViewContextImpl.java:322) 
org.primefaces.context.PrimePartialViewContext.processPartial(PrimePartialViewContext.java:60) 
javax.faces.component.UIViewRoot.encodeChildren(UIViewRoot.java:1004) 
javax.faces.component.UIComponent.encodeAll(UIComponent.java:1856) 
com.sun.faces.application.view.FaceletViewHandlingStrategy.renderView(FaceletViewHandlingStrategy.java:430) 
com.sun.faces.application.view.MultiViewHandler.renderView(MultiViewHandler.java:133) 
com.sun.faces.lifecycle.RenderResponsePhase.execute(RenderResponsePhase.java:120) 
com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) 
com.sun.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:219) 
javax.faces.webapp.FacesServlet.service(FacesServlet.java:655) 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:291) 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) 
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:239) 
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) 
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:219) 
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106) 
org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502) 
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:142) 
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79) 
org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:610) 
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88) 
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:518) 
org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1091) 
org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:668) 
org.apache.coyote.http11.Http11NioProtocol$Http11ConnectionHandler.process(Http11NioProtocol.java:223) 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1517) 
org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1474) 
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) 
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) 
org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61) 
java.lang.Thread.run(Unknown Source)

有些东西停留在后台，也许是后台请求。我的问题：什么导致了内存泄漏？我该如何解决这个问题？感谢并抱歉，长时间表示。

来源

2015-05-21 Adam Eros

记住要确保你的“表单”类，特别是它对'DataSource'的访问是线程安全的。如果没有，你可能会损坏你的'DataSource'，这不能保证是线程安全的。您当前使用的'DataSource.getConnection'不是线程安全的。 –

您没有关闭Connection，从而产生内存泄漏。这可以在这里指出的堆栈跟踪（emphasys矿）：

sun.misc.Unsafe.park（本机方法） java.util.concurrent.locks.LockSupport.park（来源不明） java.util中.concurrent.locks.AbstractQueuedSynchronizer $ ConditionObject.await（Unknown Source） org.apache.tomcat.dbcp.pool2.impl.LinkedBlockingDeque.takeFirst（LinkedBlockingDeque.java:582） org.apache.tomcat.dbcp.pool2.impl。 GenericObjectPool.borrowObject（GenericObjectPool.java:439） org.apache.tomcat.dbcp.pool2.impl.GenericObjectPool.borrowObject（GenericObjectPool.java:360） org.apache.tomcat.dbcp.dbcp2.PoolingDataSource.getConnection（PoolingDataSource。 java：118） org.apache.tomcat.dbcp.dbcp2.BasicDataSource.getConnection（BasicDataSource.java:1412）

简而言之：ALWAYS关闭资源。

两种方式做到这一点：

显式调用方法close：
```
ps.close(); 
con.close(); 
```

使用try-with-resources（可用自Java 7中），没有必要打电话close以来试试就自动为你做：

String sql = "..."; 
try (Connection con = ds.getConnection(); 
    PreparedStatement ps = con.prepareStatement(sql)) { 
    //... 
} catch (SQLException e) { 
    //ALWAYS handle your exceptions as well 
}

来源

2015-05-21 16:30:25

真棒兄弟真棒！它的作品谢谢你:)并感谢你的tipp。 –

不客气。 –

即使你明确地关闭了事情，你也需要总是使用'try/catch'，* always *，** always **。 –

JSF mysql tomcat内存泄漏

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