dlmarion commented on issue #45:
URL:
https://github.com/apache/accumulo-classloaders/issues/45#issuecomment-3762126753
There was discussion in the original comment thread about finding a JMX
client library to use in an end-to-end example utility. Just adding this to the
discussion - I came across Jolokia, which can be set a a javaagent on a JVM
that then exposes JMX MBeans via an HTTP interface. I was able to test this
very easily by doing the following:
1. Downloading the agent jar
(https://search.maven.org/remotecontent?filepath=org/jolokia/jolokia-agent-jvm/2.4.2/jolokia-agent-jvm-2.4.2-javaagent.jar)
2. Adding the following in the tserver options in accumulo-env.sh:
`-javaagent:/path/to/agent.jar=port=7777,host=localhost`
3. Then using a browser to make the following HTTP request:
`http://localhost:7777/jolokia/read/org.apache.accumulo.classloader:type=ContextClassLoaders`.
This resulted in the following response:
```
{
"request": {
"mbean": "org.apache.accumulo.classloader:type=ContextClassLoaders",
"type": "read"
},
"value": {
"ReferencedFiles": {
"file:///tmp/contexts.json-c1f19a8a3b1864fcec75464ececbde919bc834e8128b72ce35d20bbdbd72a211":
[
"file:/tmp/contexts/resources/example-iterators-a-1.0.0-SNAPSHOT-337fe466c1cf0f6299e468b581300d760b9c29940e007134de61246138e53164.jar"
]
},
"ObjectName": {
"objectName":
"org.apache.accumulo.classloader:type=ContextClassLoaders"
}
},
"status": 200,
"timestamp": 1768603278
}
```
Relevant links:
https://jolokia.org/reference/html/manual/agents.html#agents-jvm
https://jolokia.org/reference/html/manual/jolokia_protocol.html#get-requests
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