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From moodycl <calvin.mo...@l-3com.com>
Subject Applet Class Loader Problems
Date Wed, 25 Sep 2013 20:06:20 GMT

I am having a problem loading classes when my applet reconnects to the
backup server after a network failure. My messages are taking a very long
time to be processed and I think that it is because the
ClassLoadingAwareObjectInputStream is still trying to connect to the
original server that served up the applet.

I think that the ClassLoadingAwareObjectInputStream is still referencing the
original classloader URL and has to wait for that request to timeout before
it falls to the backup classloader. Another strange thing is that this
appears to only be happening for the primitive types. (int, boolean, etc.) I
have not yet seen it fail for any other class. 

I have several threads blocked waiting for an ActiveMQ Session Task to
release it's lock.
I have included the stacktrace. 

Name: ActiveMQ Session Task-96
State: RUNNABLE
Total blocked: 19  Total waited: 77

Stack trace: 
 java.net.TwoStacksPlainSocketImpl.socketConnect(Native Method)
java.net.AbstractPlainSocketImpl.doConnect(Unknown Source)
   - locked java.net.TwoStacksPlainSocketImpl@1dcac73
java.net.AbstractPlainSocketImpl.connectToAddress(Unknown Source)
java.net.AbstractPlainSocketImpl.connect(Unknown Source)
java.net.PlainSocketImpl.connect(Unknown Source)
java.net.SocksSocketImpl.connect(Unknown Source)
java.net.Socket.connect(Unknown Source)
sun.security.ssl.SSLSocketImpl.connect(Unknown Source)
sun.net.NetworkClient.doConnect(Unknown Source)
sun.net.www.http.HttpClient.openServer(Unknown Source)
sun.net.www.http.HttpClient.openServer(Unknown Source)
   - locked sun.net.www.protocol.https.HttpsClient@bdc77d
sun.net.www.protocol.https.HttpsClient.<init>(Unknown Source)
sun.net.www.protocol.https.HttpsClient.New(Unknown Source)
sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.getNewHttpClient(Unknown
Source)
sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
sun.net.www.protocol.https.AbstractDelegateHttpsURLConnection.connect(Unknown
Source)
sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)
   - locked sun.net.www.protocol.https.DelegateHttpsURLConnection@1c204d7
java.net.HttpURLConnection.getResponseCode(Unknown Source)
sun.net.www.protocol.https.HttpsURLConnectionImpl.getResponseCode(Unknown
Source)
sun.plugin2.applet.Applet2ClassLoader.getBytes(Unknown Source)
sun.plugin2.applet.Applet2ClassLoader.access$000(Unknown Source)
sun.plugin2.applet.Applet2ClassLoader$1.run(Unknown Source)
java.security.AccessController.doPrivileged(Native Method)
sun.plugin2.applet.Applet2ClassLoader.findClass(Unknown Source)
sun.plugin2.applet.Plugin2ClassLoader.loadClass0(Unknown Source)
sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
   - locked sun.plugin2.applet.Applet2ClassLoader@1fe96f2
sun.plugin2.applet.Plugin2ClassLoader.loadClass(Unknown Source)
   - locked sun.plugin2.applet.Applet2ClassLoader@1fe96f2
java.lang.ClassLoader.loadClass(Unknown Source)
java.lang.Class.forName0(Native Method)
java.lang.Class.forName(Unknown Source)
org.apache.activemq.util.ClassLoadingAwareObjectInputStream.load(ClassLoadingAwareObjectInputStream.java:77)
org.apache.activemq.util.ClassLoadingAwareObjectInputStream.resolveClass(ClassLoadingAwareObjectInputStream.java:46)
java.io.ObjectInputStream.readNonProxyDesc(Unknown Source)
java.io.ObjectInputStream.readClassDesc(Unknown Source)
java.io.ObjectInputStream.readClass(Unknown Source)
java.io.ObjectInputStream.readObject0(Unknown Source)
java.io.ObjectInputStream.readArray(Unknown Source)
java.io.ObjectInputStream.readObject0(Unknown Source)
java.io.ObjectInputStream.defaultReadFields(Unknown Source)
java.io.ObjectInputStream.readSerialData(Unknown Source)
java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
java.io.ObjectInputStream.readObject0(Unknown Source)
java.io.ObjectInputStream.defaultReadFields(Unknown Source)
java.io.ObjectInputStream.readSerialData(Unknown Source)
java.io.ObjectInputStream.readOrdinaryObject(Unknown Source)
java.io.ObjectInputStream.readObject0(Unknown Source)
java.io.ObjectInputStream.readObject(Unknown Source)
org.apache.activemq.command.ActiveMQObjectMessage.getObject(ActiveMQObjectMessage.java:185)
com.mypackage.MyClass$2.processObjectMessage(MyClass.java:386)
com.mypackage.JMSMessageProcessor.onMessage(JMSMessageProcessor.java:29)
   - locked com.mypackage.MyClass$2@9595d2
org.apache.activemq.ActiveMQMessageConsumer.dispatch(ActiveMQMessageConsumer.java:1321)
   - locked java.lang.Object@40c537
org.apache.activemq.ActiveMQSessionExecutor.dispatch(ActiveMQSessionExecutor.java:131)
org.apache.activemq.ActiveMQSessionExecutor.iterate(ActiveMQSessionExecutor.java:202)
org.apache.activemq.thread.PooledTaskRunner.runTask(PooledTaskRunner.java:129)
org.apache.activemq.thread.PooledTaskRunner$1.run(PooledTaskRunner.java:47)
java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
java.lang.Thread.run(Unknown Source)





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