Unsupported class file major version 29281

[joachimhs]

Hello,

I am getting the following when I am trying to start my Java Application via the command line. I have built the app on JDK 16, and I am starting it on JDK 16. Using the Brace 2.2.2 download from GitHub. I am running this in an Apple Silicon Mac.

What version of Java do I need to use?

[joachimhs]

Hm. It seems that when I run BTrace with -javaagent, and use the scriptdir command, it picks up any file in that directory. Not only .class files. So the file .DS_Store (that gets automatically generated on Macs for each folder), is picked up and attempted to load into the Java application.

[jbachorik]

This is very strange - there is definitely no version 29281 of the java class format.

Can you provide the exact steps to reproduce, please?

[joachimhs]

Hello,

Looking at this, it seems that BTrace attempts to pick up any file in the scriptdir directory, so when it tries to pick up this ".DS_Store" file, it throws that exception.

I think there ought to be a filter that filters out anything not ending with .class when loading script files from a directory.

[joachimhs]

Created PR: https://github.com/btraceio/btrace/pull/580

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