Hi everybody,

with the upcoming release of JDK 14 in March, I think we should try to be up-to-date with the latest JDK. I have spent several hours to start the work to support JDK 13, and here are the state so far :

• Groovy upgraded to 2.5.8 (for jdk13 compatibility)
• Jaxen upgraded to 1.2.0 (to avoid module conflict with org.w3c.dom)
• one test had to be modified to prevent the use of reflection which has been forbidden by JDK-8210522 CSR.

It seems to work for simple projects, but I have two issues :

• the JDT Compiler gives "Type already existing errors" when hot-recompiling classes in dev mode. I could force a policy so that all compile errors are ignored to go further, but that's far from ideal
• modules do not work : the classes are not properly recompiled and lead to errors (like "FasterGT" : there are some conflicts between package names and compiled template names)

If you want to get a look or contribute, you can see the work in progress here : https://github.com/tomparle/play1/tree/upgrade-jdk-13

I'll try to make some more progress later but module errors seem hard to solve.
All comments appreciated !