Java (Java Agent, Installation, JVM, and Controller Installation)

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Crash with javaagent

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Wanderer

Crash with javaagent

I get exception while running with javaagent and no information is sent to controller from javaagent. I've attached log file from applicationserver and javaagent

 

My application server log file has below exception...

 

Running obfuscated agent
Registered app server agent with Node ID[8] Component ID[11] Application ID [7]

Could not start Java Agent, Disabling !!!!!java.lang.NullPointerException ,Please check log files
java.lang.NullPointerException
    at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1838)
    at sun.misc.FloatingDecimal.parseDouble(FloatingDecimal.java:110)
    at java.lang.Double.parseDouble(Double.java:538)
    at com.singularity.ee.agent.appagent.services.gcvisibility.e.e(e.java:327)
    at com.singularity.ee.agent.appagent.services.B.a(B.java:54)
    at com.singularity.ee.agent.appagent.services.y.f(y.java:175)
    at com.singularity.ee.agent.appagent.services.y.d(y.java:147)
    at com.singularity.ee.agent.appagent.services.y.c(y.java:138)
    at com.singularity.ee.agent.appagent.services.y.allServicesStarted(y.java:82)
    at com.singularity.ee.agent.appagent.kernel.bm.c(bm.java:360)
    at com.singularity.ee.agent.appagent.kernel.m.start(m.java:147)
    at com.singularity.ee.agent.appagent.kernel.JavaAgent.initialize(JavaAgent.java:510)
    at com.singularity.ee.agent.appagent.kernel.JavaAgent.initialize(JavaAgent.java:308)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.singularity.ee.agent.appagent.AgentEntryPoint$1.run(AgentEntryPoint.java:647)

 

And agent log file has below exception

 

[Thread-21] 20 Feb 2018 16:14:02,152  WARN AgentConfigWatchdog - Error in initializing from app-agent-config.xml
java.lang.NullPointerException
    at com.singularity.ee.agent.appagent.kernel.config.xml.a.a(a.java:474)
    at com.singularity.ee.agent.appagent.kernel.config.xml.a.d(a.java:432)
    at com.singularity.ee.agent.appagent.kernel.config.xml.a.doOnChange(a.java:123)
    at com.singularity.util.org.apache.log4j.helpers.FileWatchdog.checkAndConfigure(FileWatchdog.java:87)
    at com.singularity.util.org.apache.log4j.helpers.FileWatchdog.<init>(FileWatchdog.java:59)
    at com.singularity.ee.agent.appagent.kernel.config.xml.a.<init>(a.java:101)
    at com.singularity.ee.agent.appagent.kernel.config.xml.e.d(e.java:369)
    at com.singularity.ee.agent.appagent.kernel.config.xml.e.<init>(e.java:168)
    at com.singularity.ee.agent.appagent.kernel.m.start(m.java:112)
    at com.singularity.ee.agent.appagent.kernel.JavaAgent.initialize(JavaAgent.java:510)
    at com.singularity.ee.agent.appagent.kernel.JavaAgent.initialize(JavaAgent.java:308)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:497)
    at com.singularity.ee.agent.appagent.AgentEntryPoint$1.run(AgentEntryPoint.java:647)

 

I'm not sure if these are related.

 

Crash with javaagent
8 REPLIES 8
Moderator

Re: Crash with javaagent

Looking at your agent log, the agent is reporting successfully to the controller.

 

The exception does suggest however that the agent is having trouble parsing its app-agent-config.xml file.

 

Has that file got corrupted in some way?  Can you post it here?

 

Warm regards,

Peter



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Wanderer

Re: Crash with javaagent

Thanks for your prompt response.

 

I've attached app-agent-config.xml from ver4.4.1.0\conf folder. I've not made any changes to this so this should be same as default one. But I have renamed extension from xml to txt as this forum doesn't allow uploading xml file.

 

Based on the below exception, do you know which field in app-agent-config.xml I should look for?

 

[Thread-21] 20 Feb 2018 16:14:02,152  WARN AgentConfigWatchdog - Error in initializing from app-agent-config.xml
java.lang.NullPointerException
    at com.singularity.ee.agent.appagent.kernel.config.xml.a.a(a.java:474)
    at com.singularity.ee.agent.appagent.kernel.config.xml.a.d(a.java:432)
    at com.singularity.ee.agent.appagent.kernel.config.xml.a.doOnChange(a.java:123)
    at com.singularity.util.org.apache.log4j.helpers.FileWatchdog.checkAndConfigure(FileWatchdog.java:87)

 

Moderator

Re: Crash with javaagent

Ajay,

 

The exception in your agent log is benign (which is why the fact that it is logged got missed - this is fixed in the next version.

 

The exception in your stdout, however, seems to indicate that the agent cannot obtain the value of the "java.specification.version" system property.

 

Could you please open a support case and support can work through this issue with you in more depth.

 

Warm regards,

Peter



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Wanderer

Re: Crash with javaagent

Thanks Peter. I'm evaluating your software and I don't have support contract with AppDynamics yet.

 

You may right that it's failing because of misssing system property expected by javaagent.

I tried passing "java.specification.version" as system property while starting my application but still get the same error. So it may be some other system property which I can not figure out.

 

If there is no other suggestion, I'll stop my evaluation here.

 

Re: Crash with javaagent

Hi Ajay,

 

Did you solve the problem as i have the same exception and my controller did show any data.

FYI my Controller is SAAS

 

Thanks,

M.ElGazzar

Wanderer

Re: Crash with javaagent

No, sorry. I wasn't able to solve it. My best guess is the java agent is expecting some system property that's not populated from my java application. I was advised to work with AppDyanmic support which I wasn't able to.

 

Did you mean you see data in controller even with this exception?

Re: Crash with javaagent

 

Yes, but i can see the data now but still have the same this exception in my logs.

 

Thanks,

Mostafa ElGazzar

Moderator

Re: Crash with javaagent

Which exception can you see?

The one I have pasted below is benign, and you can ignore it.  It will be fixed in the next agent release.

 

[Thread-21] 20 Feb 2018 16:14:02,152  WARN AgentConfigWatchdog - Error in initializing from app-agent-config.xml
java.lang.NullPointerException
    at com.singularity.ee.agent.appagent.kernel.config.xml.a.a(a.java:474)
    at com.singularity.ee.agent.appagent.kernel.config.xml.a.d(a.java:432)
    at com.singularity.ee.agent.appagent.kernel.config.xml.a.doOnChange(a.java:123)
    at com.singularity.util.org.apache.log4j.helpers.FileWatchdog.checkAndConfigure(FileWatchdog.java:87)

 

 



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