Short answer: Update to openjdk version 8.
The problem:
After downloading Geany 1.32 from the website and installing onto Trisquel 7
64-bit, my .java programs gave the following error when I tried to compile
them:
Exception in thread "main" java.lang.UnsupportedClassVersionError: filename :
Unsupported major.minor version 52.
The fix:
The problem was fixed after installing some packages:
sudo apt install openjdk-8-dbg openjdk-7-dbg openjdk-7-jdk openjdk-7-demo
openjdk-7-source visualvm
Many of these probably didn't help; I installed them because apt recommended
them. The package that fixed the problem was probably openjdk-8-dbg. I'm too
lazy to check though-- sorry. I had previously installed the following:
openjdk-8-jdk openjdk-8-jre openjdk-8-jre-headless.
I can once again compile .java programs with Geany.
