shanemhansen opened a new issue, #23268:
URL: https://github.com/apache/beam/issues/23268
### What happened?
While attempting to use the builtin java expansion server to utilize a java
Bigtable Source from python I ran into errors due to the generated temporary
jar file being invalid. In particular `Class-Path: ` was too long and caused
the jvm to fail to start with a "could not find main class" error.
I was able to track down the offending code and monkey-patch it so that it
went from generating entries like this:
```
Class-Path: file1.jar file.jar .....
```
to
```
Class-Path: file1.jar
file2.jar
file3.jar
```
Which fixed the problem. See monkey-patched code here along with sample java
project (apologies the gist isn't entirely complete. The '--classpath' entry
was generated from the following command:
```sh
mvn dependency:build-classpath -Dmdep.outputFile=cp.txt
```
I believe this affects versions of beam since at least
6b9e37484038f0733db64af1c905adf7706f1d88 (and probably before since that was a
revert).
I have an inbound PR which fixes this issue.
### Issue Priority
Priority: 2
### Issue Component
Component: sdk-py-core
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