[LANG-1715] ThreadUtils.getAllThreads returns null threads

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Duplicate
• Affects Version/s: 3.13.0
• Component/s: lang.*
• Assignee: Unassigned
• Reporter: Stefan Pfafferott
• Created: 09/Oct/23 11:31
• Updated: 10/Oct/23 06:36
• Resolved: 10/Oct/23 06:36

Description

The Collection returned by ThreadUtils.getAllThreads() contains null elements.

Example test code:

@Test
public void getAllThreads() {
    Collection<Thread> allThreads = ThreadUtils.getAllThreads();
    allThreads.forEach(Assertions::assertNotNull);
}

Cause should be in ThreadUtils.findThreads line 375 in conjunction with line 379. The array is created larger than the actual number of threads. getAllThreads uses an "always true" predicate. This way, the null elements of the array are copied to the result list.

In 3.12.0, only the elements up to the returned "count" are copied.

I suggest to add a "not null" filter when creating the result list.

Issue Links

• duplicates: LANG-1706 ThreadUtils findThreads returns a list with nulls elements