https://github.com/marschall/jfr-leaker

a reproducer for a JFR memory leak
https://github.com/marschall/jfr-leaker

java java-flight-recorder jfr memory-leak

Last synced: 3 months ago
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a reproducer for a JFR memory leak

• Host: GitHub
• URL: https://github.com/marschall/jfr-leaker
• Owner: marschall
• Created: 2020-04-30T17:57:07.000Z (about 5 years ago)
• Default Branch: master
• Last Pushed: 2020-05-30T18:56:08.000Z (almost 5 years ago)
• Last Synced: 2025-01-16T02:45:06.303Z (4 months ago)
• Topics: java, java-flight-recorder, jfr, memory-leak
• Language: Java
• Size: 387 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
JFR Leaker

==========

A reproducer for the [JDK-8245951](https://bugs.openjdk.java.net/browse/JDK-8245951) JFR memory leak. The leak is `jdk.jfr.internal.TypeLibrary` keeps on holding to `jdk.jfr.internal.PlatformEventType` instances even when the underlying classes are unloaded.

This can for example happen when you redeploy a web application that contains custom JFR events.

The dominator tree shows the issue is `jdk.jfr.internal.TypeLibrary`.

![dominator tree](https://github.com/marschall/jfr-leaker/raw/master/src/main/javadoc/dominator_tree.png "Dominator Tree")

The histogram shows the issue is `jdk.jfr.internal.TypeLibrary` holding on to `jdk.jfr.internal.PlatformEventType`.

![histogram](https://github.com/marschall/jfr-leaker/raw/master/src/main/javadoc/histogram.png "Histogram")

The object list shows the issue is `jdk.jfr.internal.TypeLibrary#types` holding on to `jdk.jfr.internal.PlatformEventType`.

![list objects](https://github.com/marschall/jfr-leaker/raw/master/src/main/javadoc/list_objects.png "List Objects")

The classloader explorer shows not ClassLoader-leaks.

![classloader explorer](https://github.com/marschall/jfr-leaker/raw/master/src/main/javadoc/classloader_explorer.png "ClassLoader Explorer")

The issue can be reproduced with

```

java -Xmx64m -Xms64m -XX:MaxMetaspaceSize=64m -XX:+UseSerialGC -XX:+HeapDumpOnOutOfMemoryError -jar target/jfr-leaker-0.1.0-SNAPSHOT.jar 

```