NPE with Java Records: Cannot invoke "org.eclipse.jdt.internal.compiler.lookup.MethodBinding.original()" because "binding" is null

[jnehlmeier]

GWT Version: HEAD

---

When creating a record (code can be unused)

public record TestRecord() {

  private static final int CAUSES_NPE = 1;

}

GWT compiler fails with exception

com.google.gwt.dev.jjs.InternalCompilerException: Error constructing Java AST
        at com.google.gwt.dev.jjs.impl.GwtAstBuilder.translateException(GwtAstBuilder.java:4239)
        at com.google.gwt.dev.jjs.impl.GwtAstBuilder.getInternalCompilerException(GwtAstBuilder.java:4678)
        at com.google.gwt.dev.jjs.impl.GwtAstBuilder.createMembers(GwtAstBuilder.java:4373)
        at com.google.gwt.dev.jjs.impl.GwtAstBuilder.processImpl(GwtAstBuilder.java:4171)
        at com.google.gwt.dev.jjs.impl.GwtAstBuilder.process(GwtAstBuilder.java:4213)
        at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater$UnitProcessorImpl.process(CompilationStateBuilder.java:128)
        at com.google.gwt.dev.javac.JdtCompiler$CompilerImpl.process(JdtCompiler.java:329)
        at org.eclipse.jdt.internal.compiler.Compiler.processCompiledUnits(Compiler.java:575)
        at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:475)
        at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:426)
        at com.google.gwt.dev.javac.JdtCompiler.doCompile(JdtCompiler.java:1028)
        at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater.compile(CompilationStateBuilder.java:322)
        at com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:532)
        at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:464)
        at com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:426)
        at com.google.gwt.dev.Precompile.precompile(Precompile.java:210)
        at com.google.gwt.dev.Precompile.precompile(Precompile.java:190)
        at com.google.gwt.dev.Precompile.precompile(Precompile.java:131)
        at com.google.gwt.dev.Compiler.compile(Compiler.java:192)
        at com.google.gwt.dev.codeserver.Recompiler.doCompile(Recompiler.java:362)
        at com.google.gwt.dev.codeserver.Recompiler.compile(Recompiler.java:175)
        at com.google.gwt.dev.codeserver.Recompiler.recompile(Recompiler.java:134)
        at com.google.gwt.dev.codeserver.Outbox.recompile(Outbox.java:135)
        at com.google.gwt.dev.codeserver.JobRunner.recompile(JobRunner.java:113)
        at com.google.gwt.dev.codeserver.JobRunner$2.run(JobRunner.java:90)
        at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:572)
        at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:317)
        at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1144)
        at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:642)
        at java.base/java.lang.Thread.run(Thread.java:1583)
Caused by: java.lang.NullPointerException: Cannot invoke "org.eclipse.jdt.internal.compiler.lookup.MethodBinding.original()" because "binding" is null
        at com.google.gwt.dev.jjs.impl.ReferenceMapper.get(ReferenceMapper.java:99)
        at com.google.gwt.dev.jjs.impl.GwtAstBuilder.createMembers(GwtAstBuilder.java:4348)
        ... 27 more

Commenting the static field in the record makes the compiler happy again.

[jnehlmeier]

A co-worker said that even Eclipse had trouble refactoring the original, more complex code (also with AST troubles). Chances are that it might be a JDT bug in general.