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JDK Contributions

So far, we have reported, and in many cases fixed, a total of 25 bugs in the JDK, most of these in the java.util.concurrent classes.

Date Reported Description Status Pull Request
2025-04-29 Preload LockSupport.class to avoid rare lost unpark() Unresolved #24952
2025-04-28 LinkedBlockingDeque fixes and improvements Unresolved #24925
2025-04-08 LinkedBlockingDeque allows us to overflow size with addAll() Closed #24538
2025-04-08 JavaDoc states that Iterator.remove() is linear in the LinkedBlockingDeque Fixed #24500
2025-04-08 LinkedBlockingDeque offer() creates nodes even if capacity has been reached Closed #24521
2025-04-07 LinkedBlockingDeque.clear() should preserve weakly-consistent iterators Closed #24488
2025-02-06 LinkedBlockingDeque does not immediately throw InterruptedException in put/take Closed #23464
2024-11-19 State transitions in internal VirtualThread comment needs to be updated Fixed #22253
2024-11-01 ConcurrentSkipListMap.spliterator() can no longer split the stream Fixed #21820
2024-10-29 ArrayBlockingQueue serialization not thread safe Fixed #21783
2023-09-05 jcmd Thread.dump_to_file slow with millions of virtual threads Fixed
2023-02-05 ObjectInputFilter example incorrectly calls rejectUndecidedClass Fixed
2023-02-01 ThreadLocalRandom.current().doubles().parallel() contention Fixed #12366
2022-01-25 newInstanceFromSystemProperty() loads class in different ClassLoader with javac Not an Issue (?)
2021-11-13 Empty streams create too many objects Unresolved #6275
2021-02-15 Calling "main" method in anonymous nested class crashes the JVM Fixed
2021-11-15 Add a parallel multiply method to BigInteger Fixed #6409
2021-10-01 /src/jdk.management.jfr/share/classes/module-info.java has non-canonical order Fixed #5738
2021-04-14 Strange Characters in G1GC GC Log Fixed
2021-02-08 ZGC: ZWorker Threads Continue Marking After System.exit() called Fixed
2016-09-01 Java does not use user customized OS language settings for decimal points Not an Issue (?)
2016-07-18 Arrays.parallelSort() gets stuck when all common threads blocked Unresolved
2016-07-18 Arrays.parallelSort() does not sort in parallel for dual-core machines Not an Issue (?)
2015-06-08 LinkedTransferQueue<T>.spliterator can report LTQ.Node object, not T Fixed
2013-08-19 StampedLock serializes readers on writer unlock Fixed
Date Reported: 2025-04-29
Description: Preload LockSupport.class to avoid rare lost unpark()
Status: Unresolved
Pull Request: #24952
Date Reported: 2025-04-28
Description: LinkedBlockingDeque fixes and improvements
Status: Unresolved
Pull Request: #24925
Date Reported: 2025-04-08
Description: LinkedBlockingDeque allows us to overflow size with addAll()
Status: Closed
Pull Request: #24538
Date Reported: 2025-04-08
Description: JavaDoc states that Iterator.remove() is linear in the LinkedBlockingDeque
Status: Fixed
Pull Request: #24500
Date Reported: 2025-04-08
Description: LinkedBlockingDeque offer() creates nodes even if capacity has been reached
Status: Closed
Pull Request: #24521
Date Reported: 2025-04-07
Description: LinkedBlockingDeque.clear() should preserve weakly-consistent iterators
Status: Closed
Pull Request: #24488
Date Reported: 2025-02-06
Description: LinkedBlockingDeque does not immediately throw InterruptedException in put/take
Status: Closed
Pull Request: #23464
Date Reported: 2024-11-19
Description: State transitions in internal VirtualThread comment needs to be updated
Status: Fixed
Pull Request: #22253
Date Reported: 2024-11-01
Description: ConcurrentSkipListMap.spliterator() can no longer split the stream
Status: Fixed
Pull Request: #21820
Date Reported: 2024-10-29
Description: ArrayBlockingQueue serialization not thread safe
Status: Fixed
Pull Request: #21783
Date Reported: 2023-09-05
Description: jcmd Thread.dump_to_file slow with millions of virtual threads
Status: Fixed
Date Reported: 2023-02-05
Description: ObjectInputFilter example incorrectly calls rejectUndecidedClass
Status: Fixed
Date Reported: 2023-02-01
Description: ThreadLocalRandom.current().doubles().parallel() contention
Status: Fixed
Pull Request: #12366
Date Reported: 2022-01-25
Description: newInstanceFromSystemProperty() loads class in different ClassLoader with javac
Status: Not an Issue (?)
Date Reported: 2021-11-13
Description: Empty streams create too many objects
Status: Unresolved
Pull Request: #6275
Date Reported: 2021-02-15
Description: Calling "main" method in anonymous nested class crashes the JVM
Status: Fixed
Date Reported: 2021-11-15
Description: Add a parallel multiply method to BigInteger
Status: Fixed
Pull Request: #6409
Date Reported: 2021-10-01
Description: /src/jdk.management.jfr/share/classes/module-info.java has non-canonical order
Status: Fixed
Pull Request: #5738
Date Reported: 2021-04-14
Description: Strange Characters in G1GC GC Log
Status: Fixed
Date Reported: 2021-02-08
Description: ZGC: ZWorker Threads Continue Marking After System.exit() called
Status: Fixed
Date Reported: 2016-09-01
Description: Java does not use user customized OS language settings for decimal points
Status: Not an Issue (?)
Date Reported: 2016-07-18
Description: Arrays.parallelSort() gets stuck when all common threads blocked
Status: Unresolved
Date Reported: 2016-07-18
Description: Arrays.parallelSort() does not sort in parallel for dual-core machines
Status: Not an Issue (?)
Date Reported: 2015-06-08
Description: LinkedTransferQueue<T>.spliterator can report LTQ.Node object, not T
Status: Fixed
Date Reported: 2013-08-19
Description: StampedLock serializes readers on writer unlock
Status: Fixed
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