4

I'm developing an OpenJPA application (no webserver, regular java se app). In order to make OpenJPA work with my application, I need to set the openjpa-all-2.3.0.jar as a javaagent.

java -cp ... -javaagent:/full/path/to/openjpa-all-2.3.0.jar -jar app.jar

As I am packaging the openjpa.jar within the app.jar anyway, I am now wondering how it is possible to specify the javaagent, as a jar within my application jar file.

This didn't work

java -cp ".;.\app.jar" -javaagent:openjpa-all-2.3.0.jar pckg.Main
Simbi
  • 992
  • 3
  • 13
  • 29
  • Possible duplicate of [Classpath including JAR within a JAR](http://stackoverflow.com/questions/183292/classpath-including-jar-within-a-jar) – OrangeDog Dec 11 '15 at 12:22

2 Answers2

3

There's no way to do it. The JVM does not look at the classpath to find the specified agent; it is expecting a file path, and you also cannot specify file paths inside jar files.

JDK-4648386 is the related feature request, and was closed Won't Fix after 18 years.

However, what you can do is write code to copy the agent jar from a classpath resource to a temporary file, and then attach it to the current running JVM. The ByteBuddy Agent library provides tooling to do this.

OrangeDog
  • 36,653
  • 12
  • 122
  • 207
0

Simply in your MANIFEST.MF, add this property: Launcher-Agent-Class: org.path.to.your.AgentClass

Saber Chebka
  • 87
  • 4