嵌入式hazelcast防止在Tomcat中進行乾淨關閉

Question

我在Tomcat 7 webapp中嵌入了hazelcast（3.8.2）。關機時，我打電話

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

但我仍然在tomcat日誌中，這阻止了我的web應用程序的乾淨關閉這個錯誤。 HazelcastManagedThread似乎試圖在服務器停止後運行ClisterListenerSupport實例。

我是否缺少一些進一步的清理步驟我應該添加到我的關閉鉤子？

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

這很難解決。問題是，Tomcat已經處於關閉模式，類加載器不會加載新的類。 Hazelcast首次使用關閉類，因此它們需要加載。修復這實際上是非常醜陋的。您可以使用Class.forName（或其他反射機制）來加載該類。您不必存儲對該類的引用，但這實際上會強制JVM加載其他依賴類。