stankiewicz commented on PR #34514:
URL: https://github.com/apache/beam/pull/34514#issuecomment-2773178960
hey Yi,
you are right, NPE is further down:
```
Caused by: java.lang.NullPointerException: Cannot invoke "String.isEmpty()"
because "segment" is null
java.base/sun.nio.fs.UnixFileSystem.getPath(UnixFileSystem.java:271)
java.base/java.nio.file.Path.of(Path.java:147)
java.base/java.nio.file.Paths.get(Paths.java:69)
org.apache.beam.sdk.io.jdbc.JdbcUtil.lambda$saveFilesLocally$0(JdbcUtil.java:125)
java.base/java.util.ArrayList$ArrayListSpliterator.forEachRemaining(ArrayList.java:1625)
```
when jarPath is empty string my guess is that
`ResourceId sourceResourceId = FileSystems.matchNewResource(jarPath,
false);` returns `"/" as CWD is root dir on worker and when this happens
`Paths.get("/tmp", sourceResourceId.getFilename())` throws npe because
sourceResourceId.getFilename() is null.
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