matthiasblaesing commented on PR #5609:
URL: https://github.com/apache/netbeans/pull/5609#issuecomment-1484213567

   > Thanks @matthiasblaesing Couple of comments, in priority order.
   > 
   > > Only run the nbjavac test job when the Java label is added to the PR.
   > 
   > Can we please add a `nb-javac` label and only run the test on that, not 
every Java labelled PR as per [#5609 
(comment)](https://github.com/apache/netbeans/pull/5609#issuecomment-1476006761)
   
   Label created, added here and updated the final commit (and the comment 
summarizing the changes).
   
   > > `loadClass` is not synchronized and does not synchronize access to the 
caching `HashMap`. Instead of introducing synchronization, use a thread safe 
`ConcurrentHashMap`.
   > 
   > Also use `computeIfAbsent()`?
   
   Decided against it. `findClass` throws a checked exception. The mapping 
function then become more complex than the current straight implementation.


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