Failed to find Agent-Class manifest attribute from jolokia-agent-jvm-2.0.2.jar

[davsclaus]

This is from META-INF/MANIFEST.MF in jolokia-jvm-1.7.2 JAR

Manifest-Version: 1.0
Premain-Class: org.jolokia.jvmagent.JvmAgent
Archiver-Version: Plexus Archiver
Built-By: roland
Agent-Class: org.jolokia.jvmagent.JvmAgent
Can-Redefine-Classes: false
Can-Retransform-Classes: false
Can-Set-Native-Method-Prefix: false
Created-By: Apache Maven 3.8.6
Build-Jdk: 1.8.0_352
Main-Class: org.jolokia.jvmagent.client.AgentLauncher

And this is from META-INF/MANIFEST.MF in jolokia-jvm-agent-2.0.2 JAR

Manifest-Version: 1.0
Created-By: Maven JAR Plugin 3.3.0
Build-Jdk-Spec: 17

[davsclaus]

@grgrzybek it seems maybe those manifest headers are no longer in the build, and that they should be added back

[davsclaus]

Ah sorry my mistake - I forgot to specify the classifier = javaagent

[grgrzybek]

@davsclaus there's an important change in 2.x. See:

• https://jolokia.org/migration.html#jolokia_jvm_agent_module
• https://jolokia.org/reference/html/manual/agents.html#jvm-agent-installation

There's a problem in 1.7.x (not in 1.6.x) that agent-jvm without classifier is actually the one with shaded libraries and it causes problems in Maven (has both shaded libraries and dependencies).

If you need agent - the library with proper manifest, you need org.jolokia:jolokia-agent-jvm library with javaagent Maven classifier:

<dependency>
    <groupId>org.jolokia</groupId>
    <artifactId>jolokia-agent-jvm</artifactId>
    <version>2.0.2</version>
    <classifier>javaagent</classifier>
</dependency>

See:

Manifest-Version: 1.0
Created-By: Maven JAR Plugin 3.3.0
Build-Jdk-Spec: 17
Agent-Class: org.jolokia.jvmagent.JvmAgent
Can-Redefine-Classes: false
Can-Retransform-Classes: false
Can-Set-Native-Method-Prefix: false
Main-Class: org.jolokia.jvmagent.client.AgentLauncher
Premain-Class: org.jolokia.jvmagent.JvmAgent