IllegalArgumentException when using 1.9.30 GAE

[Jeremy Rochot]

Hi, 

I'm unable to upload my project since using 1.9.30 GAE:

java.lang.IllegalArgumentException: Class file is Java 8 but max supported is Java 7: org/json/CDL.class in /Users/jeremyrochot/portal/target/wizyportal-1.0-SNAPSHOT/WEB-INF/lib/json-20150729.jar

Could you help ?

Thx

[Zeehad (Cloud Platform Support)]

Hello,

It's an error which you'll generally get if deploying an app containing Java 8 source. If so, this may be expected as the Java runtime on App Engine is based on Java 7.

Also, a better place to post a question like this would be stackoverflow or the public issue tracker. This forum isn't meant for specific-issue technical support, and if such an issue is mentioned, it should be supplementary to a post which is centered around discussing more generally with the wider community of developers about the platform.

I hope this helps. Cheers!