[
https://issues.apache.org/jira/browse/AMQ-4746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Calvin Moody updated AMQ-4746:
------------------------------
Description:
In ClassLoadingAwareObjectInputStream.java the load() method makes a call to
Class.forName().
For the primitive types (int, boolean, etc.) this would result in a call
similar to:
Class.forName("int", false, loader); //Where loader is the
Applet2ClassLoader
Since Applet2ClassLoader is a URLClassLoader and "int.class" is not in the jar
cache it pulled down from the server at the start of application, it is going
to try and go to the server to resolve this class.
In the event of a network failure, this will result in the ClassLoader having
to wait for the socket timeout. (see stacktrace below) Once this socket timeout
occurs, the load() method then attempts to lookup the class in the primitive
HashMap that is statically initialized. This returns the class for the int and
the deserialization continues on.
At first it seemed like the messages were failing to be received but it turned
out they were just taking a very long time to be deserialized. This problem can
be avoided by changing the order in which ClassLoadingAwareObjectInputStream
tries to resolve the class.
Here is the change I made to the load() method:
http://activemq.2283324.n4.nabble.com/Applet-Class-Loader-Problems-td4671835.html
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)
was:
In ClassLoadingAwareObjectInputStream.java the load() method makes a call to
Class.forName().
For the primitive types (int, boolean, etc.) this would result in a call
similar to:
Class.forName("int", false, loader); //Where loader is the
Applet2ClassLoader
Since Applet2ClassLoader is a URLClassLoader and "int.class" is not in the jar
cache it pulled down from the server at the start of application, it is going
to try and go to the server to resolve this class.
In the event of a network failure, this will result in the ClassLoader having
to wait for the socket timeout. (see stacktrace in previous post) Once this
socket timeout occurs, the load() method then attempts to lookup the class in
the primitive HashMap that is statically initialized. This returns the class
for the int and the deserialization continues on.
At first it seemed like the messages were failing to be received but it turned
out they were just taking a very long time to be deserialized. This problem can
be avoided by changing the order in which ClassLoadingAwareObjectInputStream
tries to resolve the class.
Here is the change I made to the load() method:
http://activemq.2283324.n4.nabble.com/Applet-Class-Loader-Problems-td4671835.html
Affects Version/s: 5.8.0
> Applet ClassLoader Problems
> ---------------------------
>
> Key: AMQ-4746
> URL: https://issues.apache.org/jira/browse/AMQ-4746
> Project: ActiveMQ
> Issue Type: Bug
> Components: JMS client
> Affects Versions: 5.7.0, 5.8.0
> Environment: Windows 7, Java 1.7 or 1.6, Applet
> Reporter: Calvin Moody
> Labels: ClassLoader
> Original Estimate: 24h
> Remaining Estimate: 24h
>
> In ClassLoadingAwareObjectInputStream.java the load() method makes a call to
> Class.forName().
> For the primitive types (int, boolean, etc.) this would result in a call
> similar to:
> Class.forName("int", false, loader); //Where loader is the
> Applet2ClassLoader
> Since Applet2ClassLoader is a URLClassLoader and "int.class" is not in the
> jar cache it pulled down from the server at the start of application, it is
> going to try and go to the server to resolve this class.
> In the event of a network failure, this will result in the ClassLoader having
> to wait for the socket timeout. (see stacktrace below) Once this socket
> timeout occurs, the load() method then attempts to lookup the class in the
> primitive HashMap that is statically initialized. This returns the class for
> the int and the deserialization continues on.
> At first it seemed like the messages were failing to be received but it
> turned out they were just taking a very long time to be deserialized. This
> problem can be avoided by changing the order in which
> ClassLoadingAwareObjectInputStream tries to resolve the class.
> Here is the change I made to the load() method:
> http://activemq.2283324.n4.nabble.com/Applet-Class-Loader-Problems-td4671835.html
>
> 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)
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators
For more information on JIRA, see: http://www.atlassian.com/software/jira
