[ARTEMIS-3025] JsonReader char[] leak

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.17.0
• Assignee: Francesco Nigro
• Reporter: Francesco Nigro
• Created: 09/Dec/20 06:32
• Updated: 09/Feb/21 21:24
• Resolved: 12/Jan/21 01:10

Description

The default Json provider ie https://github.com/apache/johnzon is using several pools while parsing eg org.apache.johnzon.max-string-length that wouldn't pool char[] if the JsonReader isn't properly closed.

Currently we're not properly closing such readers and that means that we allocate org.apache.johnzon.max-string-length * 2 bytes on each handled notification ~ 20 MiB.

Until https://bugs.openjdk.java.net/browse/JDK-8027959 ie JDK u40, with G1GC the mentioned char[] was (very likely) allocated into the old generation as Humongous Allocation, needing a Full GC to release it.

Issue Links

• links to: GitHub Pull Request #3375