Re: Updating to GWT 2.12 SuperDevMode on start: JSwitchStatement cannot be cast to class com.google.gwt.dev.jjs.ast.JExpression

Thanks for the report, looks like you're running into https://github.com/gwtproject/gwt/issues/10024. We have a fix for that merged, you can test the HEAD-SNAPSHOT release from the sonatype snapshots repository (https://oss.sonatype.org/content/repositories/snapshots/), or wait for the 2.12.1 release (see https://github.com/gwtproject/gwt/milestone/24, will likely only contain that fix plus one other long-standing issue that impacts latest jsinterop-base and elemental2).

You can also find the failing code (easier to spot running the compiler) and add the missing "{}"s in the "if" that contains the switch statement, that will work around this bug.

On Friday, November 8, 2024 at 6:53:40 AM UTC-6 ora...@gmail.com wrote:

Hello,

I have updated from GWT 2.11 to 2.12. SuperDevMode does not start in Intellij IDEA with the following exception. Any idea how to fix this?
com.google.gwt.dev.jjs.InternalCompilerException: Error constructing Java AST
at com.google.gwt.dev.jjs.impl.GwtAstBuilder.translateException(GwtAstBuilder.java:4181)
at com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.endVisit(GwtAstBuilder.java:1091)
at org.eclipse.jdt.internal.compiler.ast.IfStatement.traverse(IfStatement.java:335)
at org.eclipse.jdt.internal.compiler.ast.MethodDeclaration.traverse(MethodDeclaration.java:437)
at org.eclipse.jdt.internal.compiler.ast.TypeDeclaration.traverse(TypeDeclaration.java:1699)
at com.google.gwt.dev.jjs.impl.GwtAstBuilder.processImpl(GwtAstBuilder.java:4117)
at com.google.gwt.dev.jjs.impl.GwtAstBuilder.process(GwtAstBuilder.java:4155)
at com.google.gwt.dev.javac.CompilationStateBuilder$CompileMoreLater$UnitProcessorImpl.process(CompilationStateBuilder.java:128)
at com.google.gwt.dev.javac.JdtCompiler$CompilerImpl.process(JdtCompiler.java:322)
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:1021)
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.codeserver.Recompiler.initWithoutPrecompile(Recompiler.java:213)
at com.google.gwt.dev.codeserver.Outbox.maybePrecompile(Outbox.java:89)
at com.google.gwt.dev.codeserver.Outbox.<init>(Outbox.java:61)
at com.google.gwt.dev.codeserver.CodeServer.makeOutboxTable(CodeServer.java:192)
at com.google.gwt.dev.codeserver.CodeServer.start(CodeServer.java:151)
at com.google.gwt.dev.codeserver.CodeServer.main(CodeServer.java:104)
at com.google.gwt.dev.codeserver.CodeServer.main(CodeServer.java:55)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at com.google.gwt.dev.shell.SuperDevListener.runCodeServer(SuperDevListener.java:118)
at com.google.gwt.dev.shell.SuperDevListener.start(SuperDevListener.java:97)
at com.google.gwt.dev.DevMode.ensureCodeServerListener(DevMode.java:664)
at com.google.gwt.dev.DevModeBase.doStartup(DevModeBase.java:785)
at com.google.gwt.dev.DevMode.doStartup(DevMode.java:549)
at com.google.gwt.dev.DevModeBase.startUp(DevModeBase.java:888)
at com.google.gwt.dev.DevModeBase.run(DevModeBase.java:705)
at com.google.gwt.dev.DevMode.main(DevMode.java:430)
Caused by: java.lang.ClassCastException: class com.google.gwt.dev.jjs.ast.JSwitchStatement cannot be cast to class com.google.gwt.dev.jjs.ast.JExpression (com.google.gwt.dev.jjs.ast.JSwitchStatement and com.google.gwt.dev.jjs.ast.JExpression are in unnamed module of loader 'app')
at com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.pop(GwtAstBuilder.java:2816)
at com.google.gwt.dev.jjs.impl.GwtAstBuilder$AstVisitor.endVisit(GwtAstBuilder.java:1087)
... 34 more

Thanks,

Oleg

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