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Posted to issues@flink.apache.org by "Chesnay Schepler (JIRA)" <ji...@apache.org> on 2018/01/22 12:13:00 UTC
[jira] [Created] (FLINK-8473) JarListHandler may fail with NPE if
directory is deleted
Chesnay Schepler created FLINK-8473:
---------------------------------------
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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