Before we moved to Java 11 we recommended using the -XX:+AggressiveOpts
JVM tuning option. In Java 8 this was essentially equivalent to setting
these two main parameters:
- -XX:BiasedLockingStartupDelay=500 (4000 by default)
- -XX:AutoBoxCacheMax=20000 (128 by default)
BiasedLockingStartupDelay defaults to 0 in Java 11, but AutoBoxCacheMax
still defaults to 128. Therefore, we should add
-XX:AutoBoxCacheMax=20000 to restore this optimization that's been lost
since removing -XX:+AggressiveOpts.
Incorrect handling of unknown values in selectors.
There is a slight semantic change here due to an error in the way we
were handling null identifiers. This may require a change in selector
syntax to use "IS NULL" or "IS NOT NULL" when using identifiers which
may be null in the message being selected.
This was the case for an internal filter used by the cluster connection
bridge to select which cluster notification messages to consume.
See https://issues.apache.org/jira/browse/AMQ-5281 for more details.
The map used by LastValueQueue was inadvertently changed to a
non-thread-safe implementation in
4a4765c39c. This resulted in an occasional
ConcurrentModificationException from the hashCode implementation.
This commit restores the thread-safe map implementation and adds a test
which brute-forces a CME when using the non-thread-safe implementation.
Sometimes users want to perform custom client ID validation, and in the
case of an invalid client ID the proper reason code should be returned
in the CONNACK packet.
When the LegacyLDAPSecuritySettingPlugin has enableListener set to true
and a new permission is added it will try to modify the existing match
if one exists. This is problematic if there's a more generic wildcard
match than the specific one that's modified.
This commit fixes that problem so that instead of modifying the existing
match(es) it simply adds a new one. The plugin never should have tried
modifying the existing match in the first place as two identical matches
would be a configuration error.
Clebert Suconic
Gary Tully
Robbie Gemmell
Justin Bertram
Tiago Bueno
Domenico Francesco Bruscino
Vilius Šumskas
Timothy Bish