Compile Widgetset Error

Vaadin 6 / 7 / 8
1

We are in the process of migrating from Vaadin 6.6.0 to Vaadin 7.2.4 we are getting an error during the compilation of the widgetset in Vaadin7. We are recieving a NoSuchMethod error for com.google.gwt.thirdparty.guava.common.io.Files.hash. When checking the library guava-16.0.1.vaadin1.jar we find that the correct method with the correct method signature exists. The error details are as follows and any help resolving would be greatly appreciated:

[ERROR]
Unexpected internal compiler error
java.lang.NoSuchMethodError: com.google.gwt.thirdparty.guava.common.io.Files.hash(Ljava/io/File;Lcom/google/gwt/thirdparty/guava/common/hash/HashFunction;)Lcom/google/gwt/thirdparty/guava/common/hash/HashCode;
at com.google.gwt.dev.javac.PersistentUnitCache.computePersistentCacheFilenamePrefix(PersistentUnitCache.java:470)
at com.google.gwt.dev.javac.PersistentUnitCache.(PersistentUnitCache.java:114)
at com.google.gwt.dev.javac.UnitCacheSingleton.get(UnitCacheSingleton.java:59)
at com.google.gwt.dev.Compiler.run(Compiler.java:152)
at com.google.gwt.dev.Compiler.run(Compiler.java:132)
at com.google.gwt.dev.Compiler$1.run(Compiler.java:100)
at com.google.gwt.dev.CompileTaskRunner.doRun(CompileTaskRunner.java:55)
at com.google.gwt.dev.CompileTaskRunner.runWithAppropriateLogger(CompileTaskRunner.java:50)
at com.google.gwt.dev.Compiler.main(Compiler.java:107)

2

Sounds like you have multiple GWT Guava versions on your classpath. Have you removed gwt-user.jar and gwt-dev.jar from your classpath when you migrated?

3

Thank you John,

You were absolutely right and the issue has been resolved. In addition to removing those jars from my classpath I also had to remove their reference from my gwt.xml file.

Again thank you for your help.