How can I get around this internal GWT compiler error

Question

I can not compile js in GWT.

devmode is working fine, as always. I made several changes between compilers, so I don’t know exactly where to look.

What can solve this?

[gwt 2.5 AE 1.7.1]

[ERROR] Unexpected internal compiler error 

java.lang.RuntimeException: Unexpected IOException in memory thread at com.google.gwt.dev.javac.CompilationUnit.getTypes (CompilationUnit.java:324) at com.google.gwt.dev.jjs.impl.UnifyAst.assimilateUnit ( UnifyAst.java:672) at com.google.gwt.dev.jjs.impl.UnifyAst.searchForTypeBySource (UnifyAst.java:985) at com.google.gwt.dev.jjs.impl.UnifyAst.addRootTypes (UnifyAst.java: 530) at com.google.gwt.dev.jjs.JavaToJavaScriptCompiler.precompile (JavaToJavaScriptCompiler.java:621) at com.google.gwt.dev.jjs.JavaScriptCompiler.precompile (JavaScriptCompiler.java:33) at com.google.gwt .dev.Precompile.precompile (Precompile.java:278) at com.google.gwt.dev.Precompile.precompile (Precompile.java:229) at com.google.gwt.dev.Precompile.precompile (Precompile.java:141 ) on com.google.gwt.dev.Compiler.run (Compiler.java:232) on com.google.gwt.dev.Compiler.run (Compiler.java:198) on com.google.gwt.dev.Compiler $ 1 .run (Compiler.java:170) on com.google. gwt.dev.CompileTaskRunner.doRun (CompileTaskRunner.java:88) on com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger (CompileTaskRunner.java:82) on com.google.gwt.dev.Compiler.mava (Compiler. 177) Called: java.io.InvalidClassException: com.google.gwt.dev.jjs.ast.JDeclaredType; the local class is incompatible: stream classdesc serialVersionUID = -8155793964565947646, the local class serialVersionUID = -1052417216019896795 in java.io.ObjectStreamClass.initNonProxy (ObjectStreamClass.java:604) in java.io.Oject.java:60_Stream.ObjectNoj.onject.Object.Object.ObjectNoj.Onject.Object.Object.ObjectNoj.Oject.Object.Object.ObjectNoj. io.ObjectInputStream.readClassDesc (ObjectInputStream.java:1514) in java.io.ObjectInputStream.readNonProxyDesc (ObjectInputStream.java:1601) in java.io.ObjectInputStream.readClassDesc (ObjectInputStream.javaObio.14avaO14.O (ObjectInputStream.java:1750) in java.io.ObjectInputStream.readObject0 (ObjectInputStream.java:1347) in java.io.ObjectInputStream.readObject (ObjectInputStream.javahaps69) in java.util.ArrayList.readObject (ArrayList. 733) at sun.reflect.GeneratedMethodAccessor21.invoke (Unknown source) at sun.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccess orImpl.java:43) in java.lang.reflect.Method.invoke (Method.java:601) in java.io.ObjectStreamClass.invokeReadObject (ObjectStreamClass.java:1004) in java.io.ObjectInputStream.readSerialData (ObjectInputStream.java : 1872) in java.io.ObjectInputStream.readOrdinaryObject (ObjectInputStream.java:1777) in java.io.ObjectInputStream.readObject0 (ObjectInputStream.java:1347) in java.io.ObjectInputStream.readObject (ObjectInput69ream java .google.gwt.dev.jjs.ast.JProgram.deserializeTypes (JProgram.java:203) on com.google.gwt.dev.javac.CompilationUnit.getTypes (CompilationUnit.java:322) ... 14 more Shutting down the PersistentUnitCache stream

Answer 1

Solution: delete the folder named gwt-unitCache

Answer 2

When you see this "local class incompatible: stream classdesc serialVersionUID = -8155793964565947646, local class serialVersionUID = -1052417216019896795", then you probably tried to compile a newer version of GWT using the older GWT compiler. The solution for it when you use Maven is to change the version of GWT. for instance

 <plugin> <groupId>org.codehaus.mojo</groupId> <artifactId>gwt-maven-plugin</artifactId> <version>2.5.0</version> <executions> <!-- GWT version detected from dependencyManagement --> <execution> <goals> <goal>compile</goal> </goals> </execution> </executions> 

Change <version>2.5.0</version> to <version>2.5.1</version> , it works for me.