Stefan E. Funk created CXF-4267:
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             Summary: A NPE in AttatchmentDataSource could be guarded.
                 Key: CXF-4267
                 URL: https://issues.apache.org/jira/browse/CXF-4267
             Project: CXF
          Issue Type: Bug
          Components: JAX-WS Runtime
    Affects Versions: 2.5.2
            Reporter: Stefan E. Funk
            Priority: Trivial


If I do a release a hold on a DataSource like this:

void release(DataSource ds) throws IOException {
  AttachmentDataSource ads = getAttachmentDataSource(ds);
  if (ads != null) {
    // tell attachment to hold the temporary file;
    ads.release();
  }
}

and the ads.isCached() is false, I get a NPE. I know that without a hold() 
there should be no release(), but sometimes it may happen anyway (e.g. in 
finally blocks), and then it would not be necesarry to check isCahced() before.

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