I tried using @Deprecated (since="2.0", forRemoval=true) and got compilation errors, then i found out that the GWT default JRE emulation uses JDK8 java.lang.Deprecated which may or may not have been the culprit to my issues.So i asked to get confirmation by the community.
While you can use Java 11 syntax, the emulated JRE API is on Java 8 level, see: https://github.com/gwtproject/gwt/issues/9547
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