justinmclean opened a new issue, #9139:
URL: https://github.com/apache/gravitino/issues/9139
### What would you like to be improved?
In TreeLock.java in unlock there is a NPE when you have a null timestamp
Here is a unit test to help:
```
@Test
void testUnlockWithMissingHoldingTimestamp() {
TreeLockNode rootNode = new TreeLockNode("root");
TreeLockNode childNode = rootNode.getOrCreateChild("child").getLeft();
TreeLock treeLock =
new TreeLock(Arrays.asList(rootNode, childNode),
NameIdentifier.of("root", "child"));
treeLock.lock(LockType.WRITE);
childNode.getHoldingThreadTimestamp().clear();
assertDoesNotThrow(treeLock::unlock);
}
```
### How should we improve?
deal with null timestamps
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