Exit and Heap Dump on OutOfMemoryError

Publicado às 19/11/2022 17:00 • #java #tutorial

When your Java app crashes due to OutOfMemoryError, you probably want to automatically restart your application. After all, what's the point of keeping the application running if a OutOfMemoryError was thrown, since in that case you probably have a memory leak, so trying to catch the error and continue executing the app is unviable.

To do this, you can add -XX:+ExitOnOutOfMemoryError to your startup flags, this will cause the JVM to automatically exit when a OutOfMemoryError is thrown, sweet!

However, you may also want to create a heap dump when a OutOfMemoryError is thrown, to analyze the heap dump later to figure out what triggered the error. In that case, use -XX:+ExitOnOutOfMemoryError -XX:+HeapDumpOnOutOfMemoryError, this will create a heap dump on OutOfMemoryError and then exit.

You can change the heap dump folder with -XX:HeapDumpPath, so, if you want to store your heap dumps in the /tmp/dump folder, use -XX:HeapDumpPath=/tmp/dump!

Here's how you would use it when starting your application.

java -Xmx1G -Xms1G -XX:+ExitOnOutOfMemoryError -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/tmp/dump -jar ...

Revisões da Postagem

077e55fd 19/11/2022 16:26 Add new post about OutOfMemoryError