JCR重新開放連接

Question

我正在使用JCR 1.0，並且在關閉它們之後重新打開JCR連接時出現問題。

這裏是我的兩個輔助方法：

private void openConnection() throws Exception { 
    loadDbProperties(); 

    repository = new TransientRepository(repositoryConfig,repositoryHome); 
    session = repository.login(new SimpleCredentials("testUserName","testPassword".toCharArray())); 

    ws = session.getWorkspace(); 

    rootNode = session.getRootNode(); 
} 

private void closeConnection() throws Exception { 
    session.save(); 
    session.logout(); 
    session = null; 
    repository = null; 
} 

我呼籲兩個方法，方法addProperty（）和getProperty（），都需要在JCR庫的連接。我在add和get方法的開頭都放置了openConnection（）和closeConnection（）方法，但似乎無論哪個方法運行第二個方法都無法重新打開已關閉的連接。

這是個例外，我得到：

javax.faces.el.EvaluationException: javax.jcr.RepositoryException: this session has been closed 
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:102) 
    at com.sun.faces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:102) 
    at javax.faces.component.UICommand.broadcast(UICommand.java:315) 
    at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:775) 
    at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1267) 
    at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:82) 
    at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101) 
    at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118) 
    at javax.faces.webapp.FacesServlet.service(FacesServlet.java:312) 
    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:306) 
    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210) 
    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240) 
    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) 
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164) 
    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100) 
    at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:550) 
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118) 
    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:380) 
    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:243) 
    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:188) 
    at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:288) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886) 
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908) 
    at java.lang.Thread.run(Thread.java:619) 
Caused by: javax.jcr.RepositoryException: this session has been closed 
    at org.apache.jackrabbit.core.SessionImpl.sanityCheck(SessionImpl.java:340) 
    at org.apache.jackrabbit.core.ItemImpl.sanityCheck(ItemImpl.java:154) 
    at org.apache.jackrabbit.core.NodeImpl.addNode(NodeImpl.java:1751) 
    at pgts.trueMiner.core.dao.TenureDAOImpl.addTenure(TenureDAOImpl.java:63) 
    at pgts.trueMiner.core.biz.TenureServiceImpl.addTenure(TenureServiceImpl.java:63) 
    at pgts.trueMiner.core.ui.TenureForm.addTenure(TenureForm.java:50) 
    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 com.sun.el.parser.AstValue.invoke(AstValue.java:234) 
    at com.sun.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:297) 
    at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:98) 
    at javax.faces.component.MethodBindingMethodExpressionAdapter.invoke(MethodBindingMethodExpressionAdapter.java:88) 
    ... 23 more 

你如何重新打開相同的連接？我不想始終保持連接打開，因爲鎖會阻止其他應用程序使用存儲庫。

Answer 1

看起來你試圖在會話關閉後添加一個節點。我可以使用下面的測試案例重現例外：

Repository repository = new TransientRepository(); 
Session session = repository.login(
     new SimpleCredentials("admin", "admin".toCharArray())); 
session.getWorkspace(); 
Node rootNode = session.getRootNode(); 
session.save(); 
session.logout(); 
rootNode.addNode("test"); 

隨着新版本的兔崽子（我用兔崽子幹線），你會得到其中會話被關閉的堆棧跟蹤：

Exception in thread "main" javax.jcr.RepositoryException: This session has been closed. See the chained exception for a trace of where the session was closed. 
    at org.apache.jackrabbit.core.session.SessionState.checkAlive(SessionState.java:121) 
    at org.apache.jackrabbit.core.session.SessionState.perform(SessionState.java:171) 
    at org.apache.jackrabbit.core.ItemImpl.perform(ItemImpl.java:91) 
    at org.apache.jackrabbit.core.NodeImpl.addNodeWithUuid(NodeImpl.java:1790) 
    at org.apache.jackrabbit.core.NodeImpl.addNode(NodeImpl.java:1742) 
    at org.apache.jackrabbit.api.Test.main(Test.java:21) 
Caused by: java.lang.Exception: Stack trace of where session-admin-4 was originally closed 
    at org.apache.jackrabbit.core.session.SessionState.close(SessionState.java:246) 
    at org.apache.jackrabbit.core.SessionImpl.logout(SessionImpl.java:888) 
    at org.apache.jackrabbit.core.XASessionImpl.logout(XASessionImpl.java:389) 
    at org.apache.jackrabbit.api.Test.main(Test.java:20)