Error in overlay types inheritance

Hi,

I have following class hierarchy:

interface Properties

--PropertiesOverlay

----ReportRowModelOverlay

----TrendValueModelOverlay

And GWT compiler throw error:

ERROR: Exception initializing module

com.google.gwt.dev.jjs.InternalCompilerException: Already seen an implementing JSO subtype (ReportRowModelOverlay) for interface (Properties) while examining newly-added type (TrendValueModelOverlay). This is a bug in JSORestrictionsChecker.

at com.google.gwt.dev.javac.typemodel.TypeOracle.computeSingleJsoImplData(TypeOracle.java:808)

at com.google.gwt.dev.javac.typemodel.TypeOracle.finish(TypeOracle.java:696)

at com.google.gwt.dev.javac.typemodel.TypeOracleBuilder.finish(TypeOracleBuilder.java:64)

at com.google.gwt.dev.javac.TypeOracleMediator.addNewTypes(TypeOracleMediator.java:448)

at com.google.gwt.dev.javac.TypeOracleMediatorFromSource.addNewUnits(TypeOracleMediatorFromSource.java:52)

at com.google.gwt.dev.javac.CompilationState.assimilateUnits(CompilationState.java:164)

at com.google.gwt.dev.javac.CompilationState.<init>(CompilationState.java:82)

at com.google.gwt.dev.javac.CompilationStateBuilder.doBuildFrom(CompilationStateBuilder.java:466)

at com.google.gwt.dev.javac.CompilationStateBuilder.buildFrom(CompilationStateBuilder.java:388)

at com.google.gwt.dev.cfg.ModuleDef.getCompilationState(ModuleDef.java:373)

at com.google.gwt.dev.DevModeBase$UiBrowserWidgetHostImpl.createModuleSpaceHost(DevModeBase.java:108)

at com.google.gwt.dev.shell.OophmSessionHandler.loadModule(OophmSessionHandler.java:197)

at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:526)

at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364)

at java.lang.Thread.run(Thread.java:722)

I've checked this case in debug and found that the problem is in following method of Properties interface:

  <X> X set(String property, X value);

because when compiler checks if base class (PropertiesOverlay) fully implements interface(Propeties) it fails to match second parameters (X value).

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