On Wed, Jun 4, 2025 at 8:27 AM viktor_krumm <viktor_kr...@proton.me.invalid> wrote:
> Folder and file structure looks good. Debug log says: "Caused by: > java.lang.UnsupportedClassVersionError: > org/apache/guacamole/event/LoginListener has been compiled by a more recent > version of the Java Runtime (class file version 61.0), this version of the > Java Runtime only recognizes class file versions up to 52.0" > > This feels like a Maven issue. Full pom.xml: > > I don't think it's exactly a Maven issue - it sounds like the system or environment you're using to compile your custom listener code is being compiled with a Java version that is later than the one you're using to run Tomcat and the Guacamole code. While compiled Java code generally works across versions, if you compile with a later version of Java you can sometimes run into issues, particularly if you're using features or options in the code that aren't compatible with the version used to run the code. I would suggest validation the versions of Java you're using, and make sure that the one running your Tomcat and Guacamole Client environment is at least as equivalent to the one you use to compile. -Nick
