https://bz.apache.org/bugzilla/show_bug.cgi?id=66195
Bug ID: 66195
Summary: Observe multi-release JAR property from JVM available
via system properties
Product: Tomcat 9
Version: 9.0.x
Hardware: All
OS: Mac OS X 10.1
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: nob...@gmail.com
Target Milestone: -----
In 61601 , the multi-release JAR support was added. (1)
JVM also has a property to control whether the feature should be enabled or not
(2):
- system property: `jdk.util.jar.enableMultiRelease`
- Default value if not specified: `true`
This has side effects:
- Tomcat 9+ on JDK < 9 -- unaffected
- Tomcat 9+ on JDK 9+ && MR-JAR ON -- expected to work
- Tomcat 9+ on JDK 9+ && MR-JAR OFF -- unnecessary resource loading
On the latter cases, Tomcat actually delegates to JAR API which can be avoided.
The impact is that when there're large number of "resources" to cache with
Tomcat, since it also holds a lock for them, there is good chance of
contention.
If Tomcat also observes the same property, it'll enable the user applications
to completely disable MR-JAR processing which also decreases the resource
contention due to locking.
(1): https://bz.apache.org/bugzilla/show_bug.cgi?id=61601
(2):
https://github.com/openjdk/jdk/blob/jdk-11%2B28/src/java.base/share/classes/java/util/jar/JarFile.java#L188
--
You are receiving this mail because:
You are the assignee for the bug.
---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscr...@tomcat.apache.org
For additional commands, e-mail: dev-h...@tomcat.apache.org
