Chesnay Schepler created FLINK-8473:
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Summary: JarListHandler may fail with NPE if directory is deleted
Key: FLINK-8473
URL: https://issues.apache.org/jira/browse/FLINK-8473
Project: Flink
Issue Type: Improvement
Components: Webfrontend
Affects Versions: 1.4.0, 1.5.0
Reporter: Chesnay Schepler
Assignee: Chesnay Schepler
Fix For: 1.5.0, 1.4.1
The JarListHandler is responsible for listing all jars that have been uploaded
via the webUI. Uploaded jars are stored in a temporary directory, and the
handler simply iterates over the contents of this directory to create the
listing.
{code:java}
File[] list = jarDir.listFiles(new FilenameFilter() {
@Override
public boolean accept(File dir, String name) {
return name.endsWith(".jar");
}
});
// last modified ascending order
Arrays.sort(list, (f1, f2) -> Long.compare(f2.lastModified(),
f1.lastModified()));{code}
This code will fail with a {{NullPointerException}} if the directory was
deleted (like as part of some automatic cleanup). File#listFiles returns null
in this case causing Arrays.sort to throw the NPE.
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