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我们在WebLogic 10 clustured环境中使用Spring Web Flow的（2.0.9）。并在生产中，我们得到了很多LockTimeoutException的：无法在30秒后获得的谈话锁。Spring Web Flow的LockTimeoutException
我一直在试图弄清楚为什么上面的异常出现在某些情况下，只有一次点击或我们正在访问网站本身的主页。
请找正试图在SWF锁定了流量控制器的代码。我无法弄清楚的是锁正在被访问的servlet或其他东西？
请帮助理解在Web应用程序中何时发生哪些资源实际上锁定在SWF中？
要了解ReentrantLock的概念，请参阅下面的链接。
What is the Re-entrant lock and concept in general?
在此先感谢。
异常堆栈跟踪
org.springframework.webflow.conversation.impl.LockTimeoutException: Unable to acquire conversation lock after 30 seconds
at org.springframework.webflow.conversation.impl.JdkConcurrentConversationLock.lock(JdkConcurrentConversationLock.java:44)
at org.springframework.webflow.conversation.impl.ContainedConversation.lock(ContainedConversation.java:69)
at org.springframework.webflow.execution.repository.support.ConversationBackedFlowExecutionLock.lock(ConversationBackedFlowExecutionLock.java:51)
at org.springframework.webflow.executor.FlowExecutorImpl.resumeExecution(FlowExecutorImpl.java:166)
at org.springframework.webflow.mvc.servlet.FlowHandlerAdapter.handle(FlowHandlerAdapter.java:183)
at org.springframework.webflow.mvc.servlet.FlowController.handleRequest(FlowController.java:174)
at org.springframework.web.servlet.mvc.SimpleControllerHandlerAdapter.handle(SimpleControllerHandlerAdapter.java:48)
at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:875)
at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:807)
at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:571)
at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:511)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:727)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)
at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
at org.springframework.web.filter.CharacterEncodingFilter.doFilterInternal(CharacterEncodingFilter.java:96)
at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:76)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
在SWF
package org.springframework.webflow.conversation.impl;
import java.io.Serializable;
import java.util.concurrent.locks.ReentrantLock;
/**
* A conversation lock that relies on a {@link ReentrantLock} within Java 5's <code>util.concurrent.locks</code>
* package.
*
* @author Keith Donald
*/
class JdkConcurrentConversationLock implements ConversationLock, Serializable {
/**
* The lock.
*/
private ReentrantLock lock = new ReentrantLock();
public void lock() {
// ensure non-reentrant behaviour
if (!lock.isHeldByCurrentThread()) {
lock.lock();
}
}
public void unlock() {
// ensure non-reentrant behaviour
if (lock.isHeldByCurrentThread()) {
lock.unlock();
}
}
}