[BAM-3402] Failed to load Ljava.util.concurrent.ConcurrentHashMap$Segment;

Type: Suggestion
Resolution: Fixed
Fix Version/s: 2.2 M3
Component/s: Elastic Bamboo
Labels:
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A certain flow from ~~BAM-3401~~ is causing the remote agant to try to load Ljava.util.concurrent.ConcurrentHashMap$Segment;

2009-01-06 18:11:26,923 FATAL [BAM::ip-10-250-150-114.ec2.internal::Agent] [AgentContext] Agent encountered fatal error.  Exiting.
java.io.IOException: HTTP status code 500 received in response to GET request for Ljava.util.concurrent.ConcurrentHashMap$Segment;.
	at com.atlassian.bamboo.agent.bootstrap.AgentContext.httpException(AgentContext.java:24)
	at com.atlassian.bamboo.agent.bootstrap.AgentClassLoader.findClass(AgentClassLoader.java:139)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
	at com.atlassian.bamboo.agent.bootstrap.AgentClassLoader.loadClass(AgentClassLoader.java:295)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:252)
	at org.apache.activemq.util.ClassLoading.load(ClassLoading.java:112)
	at org.apache.activemq.util.ClassLoading.loadClass(ClassLoading.java:51)
	at org.apache.activemq.util.ClassLoading.loadClass(ClassLoading.java:78)
	at org.apache.activemq.util.ClassLoadingAwareObjectInputStream.load(ClassLoadingAwareObjectInputStream.java:55)
	at org.apache.activemq.util.ClassLoadingAwareObjectInputStream.resolveClass(ClassLoadingAwareObjectInputStream.java:37)
	at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575)
	at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
	at java.io.ObjectInputStream.readArray(ObjectInputStream.java:1624)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1323)
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
	at java.io.ObjectInputStream.defaultReadObject(ObjectInputStream.java:480)
	at java.util.concurrent.ConcurrentHashMap.readObject(ConcurrentHashMap.java:1265)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:597)
	at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:974)
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1849)
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
	at java.io.ObjectInputStream.defaultReadFields(ObjectInputStream.java:1947)
	at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1871)
	at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1753)
	at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351)
	at org.apache.activemq.command.ActiveMQObjectMessage.getObject(ActiveMQObjectMessage.java:166)
	at org.springframework.jms.support.converter.SimpleMessageConverter.extractSerializableFromMessage(SimpleMessageConverter.java:222)
	at org.springframework.jms.support.converter.SimpleMessageConverter.fromMessage(SimpleMessageConverter.java:109)
	at org.springframework.jms.core.JmsTemplate.doConvertFromMessage(JmsTemplate.java:763)
	at org.springframework.jms.core.JmsTemplate.receiveSelectedAndConvert(JmsTemplate.java:742)
	at com.atlassian.bamboo.v2.build.queue.AgentQueueAccessorImpl.takeBuildContext(AgentQueueAccessorImpl.java:29)
	at com.atlassian.bamboo.v2.build.agent.BuildAgentControllerImpl.waitAndPerformBuild(BuildAgentControllerImpl.java:65)
	at com.atlassian.bamboo.v2.build.agent.DefaultBuildAgent$1.run(DefaultBuildAgent.java:101)
	at com.atlassian.bamboo.build.pipeline.concurrent.NamedThreadFactory$1.run(NamedThreadFactory.java:32)
	at edu.emory.mathcs.backport.java.util.concurrent.helpers.ThreadHelpers$1.run(ThreadHelpers.java:34)
	at java.lang.Thread.run(Thread.java:619)

is detailed by

BAM-3335 Elastic Bamboo implementation M3

Closed

is related to

BAM-3401 Agent died during artifact transfer

Closed

Adrian Hempel [Atlassian] added a comment - 08/Jan/2009 6:06 AM

The observed behaviour was a consequence of ~~BAM-3401~~ leaving HttpClient in a broken state.

The ClassLoading mechanism of ActiveMQ is reliant on the AgentClassLoader throwing a ClassNotFoundException in response to an attempt to load "Ljava.util.concurrent.ConcurrentHashMap$Segment;". AgentClassLoader delegates to the server, and encounters the HttpClient problem.

Without the HttpClient problem, the call to the server completes normally, and a ClassNotFoundException is thrown.

Adrian Hempel [Atlassian] added a comment - 08/Jan/2009 6:06 AM The observed behaviour was a consequence of BAM-3401 leaving HttpClient in a broken state. The ClassLoading mechanism of ActiveMQ is reliant on the AgentClassLoader throwing a ClassNotFoundException in response to an attempt to load "Ljava.util.concurrent.ConcurrentHashMap$Segment;". AgentClassLoader delegates to the server, and encounters the HttpClient problem. Without the HttpClient problem, the call to the server completes normally, and a ClassNotFoundException is thrown.

MarkC added a comment - 08/Jan/2009 5:38 AM

Lowering priority now ~~BAM-3401~~ has been resolved.

MarkC added a comment - 08/Jan/2009 5:38 AM Lowering priority now BAM-3401 has been resolved.

Adrian Hempel [Atlassian] added a comment - 08/Jan/2009 12:38 AM

It's looking like some kookiness in ActiveMQs classloading code: It appears to be asking for a class named "Ljava.util.concurrent.ConcurrentHashMap$Segment;". The 'L' prefix and ';' suffix should only be used when the class is being used as an array element type.

Given that we don't expect classnames in this format, we're not recognising it as as belonging to a java.* package.

I'll dig a bit further, and implement a workaround if necessary.

Adrian Hempel [Atlassian] added a comment - 08/Jan/2009 12:38 AM It's looking like some kookiness in ActiveMQs classloading code: It appears to be asking for a class named "Ljava.util.concurrent.ConcurrentHashMap$Segment;". The 'L' prefix and ';' suffix should only be used when the class is being used as an array element type. Given that we don't expect classnames in this format, we're not recognising it as as belonging to a java.* package. I'll dig a bit further, and implement a workaround if necessary.

Adrian Hempel [Atlassian] added a comment - 07/Jan/2009 11:57 PM

Not so strange. Taking builds from the queue involves deserialisation.

Adrian Hempel [Atlassian] added a comment - 07/Jan/2009 11:57 PM Not so strange. Taking builds from the queue involves deserialisation.

MarkC added a comment - 07/Jan/2009 12:47 AM

Strangely, it looks like the class is being loaded when taking from queue.

	at com.atlassian.bamboo.v2.build.queue.AgentQueueAccessorImpl.takeBuildContext(AgentQueueAccessorImpl.java:29)
	at com.atlassian.bamboo.v2.build.agent.BuildAgentControllerImpl.waitAndPerformBuild(BuildAgentControllerImpl.java:65)

MarkC added a comment - 07/Jan/2009 12:47 AM Strangely, it looks like the class is being loaded when taking from queue. at com.atlassian.bamboo.v2.build.queue.AgentQueueAccessorImpl.takeBuildContext(AgentQueueAccessorImpl.java:29) at com.atlassian.bamboo.v2.build.agent.BuildAgentControllerImpl.waitAndPerformBuild(BuildAgentControllerImpl.java:65)

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Collapse comment: Adrian Hempel [Atlassian] added a comment - 08/Jan/2009 6:06 AM

Expand comment: Adrian Hempel [Atlassian] added a comment - 08/Jan/2009 6:06 AM

Collapse comment: MarkC added a comment - 08/Jan/2009 5:38 AM

Expand comment: MarkC added a comment - 08/Jan/2009 5:38 AM

Collapse comment: Adrian Hempel [Atlassian] added a comment - 08/Jan/2009 12:38 AM

Expand comment: Adrian Hempel [Atlassian] added a comment - 08/Jan/2009 12:38 AM

Collapse comment: Adrian Hempel [Atlassian] added a comment - 07/Jan/2009 11:57 PM

Expand comment: Adrian Hempel [Atlassian] added a comment - 07/Jan/2009 11:57 PM

Collapse comment: MarkC added a comment - 07/Jan/2009 12:47 AM

Expand comment: MarkC added a comment - 07/Jan/2009 12:47 AM

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