GWT compilation error with JDK 11

Hello,

I tried to compile our GWT 2.9 project with JDK 11, but encountered the following error:

Error: Could not find or load main class com.google.gwt.dev.Compiler

Caused by: java.lang.ClassNotFoundException: com.google.gwt.dev.Compiler

BTW, the Eclipse version is  Version: 2020-06 (4.16.0). 

Please help shed some lights on this issue.

thanks,

Jenny

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