topic Re: failed to attach agent to server in Splunk AppDynamics

failed to attach agent to server

Amr_Gamal — Mon, 13 Nov 2017 11:51:41 GMT

hello ,

I'm using macOS sierra , firstly i installed java(jdk 9.0.1) after that i installed the apache tomcat server and it worked successfully after that i followed the instructions in the video of installing java agent ; as i downloaded the agent and followed the steps but i can't attach the server to the agent due to the error (in the below screenshot):

i noticed that tools.jar not exist in the JDK lib folder , but i don't know why and is it the problem or what ?

how can i fix this issue , please ?

Thanks

Re: failed to attach agent to server

Peter_Holditch — Mon, 13 Nov 2017 12:00:17 GMT

java 9 removed tools.jar from the distribution, and also removed the -Xbootclasspath option (see the modules spec)

You should find that the agent will attach to your running tomcat if you simply remove this option from the command line.

Warm regards,
Peter

Re: failed to attach agent to server

Amr_Gamal — Mon, 13 Nov 2017 12:10:10 GMT

thanks peter for your support ,but i tried it but it failed also so could you tell me what needs to be modified in the command so that it can attached successfully ,the original command :

sudo java -Xbootclasspath/Library/Java/JavaVirtualMachines/jdk-9.0.1.jdk/Contents/Home/lib/classes.jar -jar /Users/amrgamal/Downloads/AppServerAgent-4/ver4.3.3.9/javaagent.jar

Best Regards

Amr

Re: failed to attach agent to server

Peter_Holditch — Mon, 13 Nov 2017 12:12:54 GMT

I just noticed from the path in your command that you are using version 4.3.3.9 of the agent.

JDK9 support was a new feature we introduced in the 4.4 release, so you will need to upgrade to a 4.4 agent and controller, or downgrade to jdk 8 to get this working.

Warm regards,
Peter

Re: failed to attach agent to server

Amr_Gamal — Mon, 13 Nov 2017 12:36:42 GMT

i downgraded to jdk but the issue still the same as below screen shot .

is there something else i should do or check for ??

thanks a lot

Re: failed to attach agent to server

Peter_Holditch — Mon, 13 Nov 2017 12:41:25 GMT

Are you sure the java command hasn't picked up the java 9 JDK?

What happens if you replace "java" with "/Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home/bin/java" ?

Re: failed to attach agent to server

Amr_Gamal — Mon, 13 Nov 2017 12:50:23 GMT

yeah i'm sure i removed jdk9

the same error happened

Re: failed to attach agent to server

Peter_Holditch — Mon, 13 Nov 2017 13:08:32 GMT

Ah, I just noticed that your bootclasspath option is slightly malformed

From the documentation, you want to run the command like this:

java -Xbootclasspath/a:<path_to_jdk>/lib/tools.jar -jar /<agent_home>/javaagent.jar <jvm_process_id>

you're missing the "/a:" part, and the process ID of your running tomcat. Can you try adding these?

Re: failed to attach agent to server

Amr_Gamal — Mon, 13 Nov 2017 13:32:24 GMT

nice , i modified the command and get the process id but it raised an exception ,

i think the problem is in the process id , it check for it but it changed over time

Re: failed to attach agent to server

Amr_Gamal — Tue, 14 Nov 2017 08:58:26 GMT

Any recommendations ??

Re: failed to attach agent to server

Peter_Holditch — Tue, 14 Nov 2017 10:06:23 GMT

So, from the above 2282 was the pid of jps itself, which explains why you can't attach to that, since it stopped running before you tried.

The second process, called "bootstrap" is presumably your tomcat, so try to attach to that. (you could see the full command line by adding the -v option to your jps command)

If you're having toruble connecting to the tomact dynamically, you could try to add the javaagent as a tomcat startup parameter, as documented here.

Re: failed to attach agent to server

Amr_Gamal — Tue, 14 Nov 2017 12:13:52 GMT

i executed the full command line with -v parameter and it returned 2 ids then

i tried to execute the command of attaching the agent but it also failed with the same error with both 2 ids

i tried to add the javaagent as a tomcat startup parameter but no changes happened

i'm really got frustrated , any suggestions in order to try appdynamics

or is there another way to practice on appdynamics

thank