Error loading Agent.jar

Document ID : KB000033232
Last Modified Date : 14/02/2018
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Problem:

When enabling APM Java Agent within JVM arguments for an Application Server this error is being logged:

Error opening zip file or JAR manifest missing : /opt/tools/introscope/R101015/wily/Agent.jar

Error occurred during initialization of VM agent library failed to init: instrument

In addition no Agent logs are being created.

 

Cause:

There are multiple reasons that could cause this issue/error to show up during initialization of JVM such as:

  • Corrupted Agent binaries (Agent.jar) either because of corrupted install or non binary FTP transfer when copying from other machine
  • Incorrect path to the Agent.jar
  • Incorrect permissions
  • JVM incompatibility with APM Java Agent

 

Solution:

Unix user id that was running the application server didn't have read permissions to the top level Agent installation directory, as a result of which it was failing to load the Agent.jar. Providing required read/write/execute permissions on the Agent install folder should address the issue.