Why do I get an UnsupportedClassVersionError for my Java app?


If you see an error such as java.lang.UnsupportedClassVersionError: play/runsupport/classloader/ApplicationClassLoaderProvider: Unsupported major.minor version 52.0.


This is caused by users trying to run a JVM app compiled for one version of the JDK on a another version of the JDK. You can check the version of Java on Heroku by running heroku run java -version. Make sure you are using the correct JDK version by setting it in the system.properties file and make sure this file is committed to Git.

Ask on Stack Overflow

Engage with a community of passionate experts to get the answers you need

Ask on Stack Overflow

Heroku Support

Create a support ticket and our support experts will get back to you

Contact Heroku Support