嵌入式hazelcast防止在Tomcat中进行干净关闭

Question

我在Tomcat 7 webapp中嵌入了hazelcast（3.8.2）。关机时，我打电话

myInstance.shutdown(); 
Hazelcast.shutdownAll(); 

但我仍然在tomcat日志中，这阻止了我的web应用程序的干净关闭这个错误。 HazelcastManagedThread似乎试图在服务器停止后运行ClisterListenerSupport实例。

我是否缺少一些进一步的清理步骤我应该添加到我的关闭钩子？

04-Oct-2017 12:15:08.923 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["http-nio-8084"] 
04-Oct-2017 12:15:08.952 INFO [main] org.apache.coyote.AbstractProtocol.stop Stopping ProtocolHandler ["ajp-nio-8009"] 
04-Oct-2017 12:15:09.048 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["http-nio-8084"] 
04-Oct-2017 12:15:09.049 INFO [main] org.apache.coyote.AbstractProtocol.destroy Destroying ProtocolHandler ["ajp-nio-8009"] 
04-Oct-2017 12:15:14.226 INFO [hz.client_0.cluster-] org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading Illegal access: this web application instance has been stopped already. Could not load [com.hazelcast.client.spi.impl.ClusterListenerSupport$1$1]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access. 
    java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [com.hazelcast.client.spi.impl.ClusterListenerSupport$1$1]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access. 
     at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForResourceLoading(WebappClassLoaderBase.java:1327) 
     at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1313) 
     at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1196) 
     at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1157) 
     at com.hazelcast.client.spi.impl.ClusterListenerSupport$1.run(ClusterListenerSupport.java:235) 
     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
     at java.lang.Thread.run(Thread.java:745) 
     at com.hazelcast.util.executor.HazelcastManagedThread.executeRun(HazelcastManagedThread.java:64) 
     at com.hazelcast.util.executor.HazelcastManagedThread.run(HazelcastManagedThread.java:80) 

    Exception in thread "hz.client_0.cluster-" java.lang.IllegalStateException: Can't overwrite cause with java.lang.IllegalStateException: Illegal access: this web application instance has been stopped already. Could not load [com.hazelcast.client.spi.impl.ClusterListenerSupport$1$1]. The following stack trace is thrown for debugging purposes as well as to attempt to terminate the thread which caused the illegal access. 
     at java.lang.Throwable.initCause(Throwable.java:457) 
     at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1316) 
     at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1196) 
     at org.apache.catalina.loader.WebappClassLoaderBase.loadClass(WebappClassLoaderBase.java:1157) 
     at com.hazelcast.client.spi.impl.ClusterListenerSupport$1.run(ClusterListenerSupport.java:235) 
     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) 
     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) 
     at java.lang.Thread.run(Thread.java:745) 
     at com.hazelcast.util.executor.HazelcastManagedThread.executeRun(HazelcastManagedThread.java:64) 
     at com.hazelcast.util.executor.HazelcastManagedThread.run(HazelcastManagedThread.java:80) 
    Caused by: java.lang.ClassNotFoundException 
     at org.apache.catalina.loader.WebappClassLoaderBase.checkStateForClassLoading(WebappClassLoaderBase.java:1315) 
     ... 8 more 

Answer 1

这很难解决。问题是，Tomcat已经处于关闭模式，类加载器不会加载新的类。 Hazelcast首次使用关闭类，因此它们需要加载。修复这实际上是非常丑陋的。您可以使用Class.forName（或其他反射机制）来加载该类。您不必存储对该类的引用，但这实际上会强制JVM加载其他依赖类。