Lambda Expressions and JavaCompiler problem

Hi,
we are using IKVM to provide the .NET version of the tuProlog engine (
http://apice.unibo.it/xwiki/bin/view/Tuprolog/).
In the recent weeks we added support for lambdas expressions into the java
version, so the user can write his own lambda ((s1,s2) -> s1.indexOf(s2)
for example) and use it inside a prolog program.

In practice what we are doing in java is the following:
1 - at runtime we build the string of a class that contains the user's
lambda, for example:
public class MyLambda {
     public java.util.function.BiFunction<String, String, Integer>
 getFunction() {
      return <here the user's lambda>;
     }
}
2 - we use the class javax.tools.JavaCompiler to compile the class on the
fly;
3 - we instantiate the class and then we use the function returned by the
method "getFunction()".

In order to make it run on IKVM we added the following line before the
retrieving of the JavaCompiler:
ikvm.runtime.Startup.addBootClassPathAssemby(Assembly.Load("IKVM.OpenJDK.Tools"));
jc = ToolProvider.getSystemJavaCompiler();

Now the problem is that when we try to excute what I described above with a
user's lambda we get this error:
An exception has occurred in the compiler (1.8.0-internal). Please file a
bug at the Java Developer Connection (http://java.sun.com/webapps/bugreport)
 after checking the Bug Parade for duplicates. Include your program and the
following diagnostic in your report.  Thank you.
java.lang.ClassCastException: Unable to cast object of type
'java.util.PropertyResourceBundle' to type
'sun.util.resources.OpenListResourceBundle'.
        at
sun.util.resources.LocaleData.getCurrencyNames(LocaleData.java:84)
        at
sun.util.locale.provider.LocaleResources.getCurrencyName(LocaleResources.java:216)
        at
sun.util.locale.provider.CurrencyNameProviderImpl.getString(CurrencyNameProviderImpl.java:122)
        at
sun.util.locale.provider.CurrencyNameProviderImpl.getSymbol(CurrencyNameProviderImpl.java:90)
        at
java.util.Currency$CurrencyNameGetter.getObject(Currency.java:647)
        at
java.util.Currency$CurrencyNameGetter.getObject(Currency.java:625)
        at
sun.util.locale.provider.LocaleServiceProviderPool.getLocalizedObjectImpl(LocaleServiceProviderPool.java:281)
        at
sun.util.locale.provider.LocaleServiceProviderPool.getLocalizedObject(LocaleServiceProviderPool.java:265)
        at java.util.Currency.getSymbol(Currency.java:505)
        at
java.text.DecimalFormatSymbols.initialize(DecimalFormatSymbols.java:648)
        at
java.text.DecimalFormatSymbols.<init>(DecimalFormatSymbols.java:113)
        at
sun.util.locale.provider.DecimalFormatSymbolsProviderImpl.getInstance
(DecimalFormatSymbolsProviderImpl.java:85)
        at
java.text.DecimalFormatSymbols.getInstance(DecimalFormatSymbols.java:181)
        at java.util.Formatter.getZero(Formatter.java:2283)
        at java.util.Formatter.<init>(Formatter.java:1892)
        at java.util.Formatter.<init>(Formatter.java:1914)
        at java.lang.StringHelper.format(StringHelper.java:2534)
        at
com.sun.tools.javac.comp.DeferredAttr$DeferredTypeMap.<init>(DeferredAttr.java:677)
        at com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:3789)
        at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3583)
        at
com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3494)
        at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3468)
        at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3455)
        at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1815)
        at
com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:1459)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:597)
        at com.sun.tools.javac.comp.Attr.attribExpr(Attr.java:645)
        at com.sun.tools.javac.comp.Attr.visitExec(Attr.java:1596)
        at
com.sun.tools.javac.tree.JCTree$JCExpressionStatement.accept(JCTree.java:1290)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:597)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:665)
        at com.sun.tools.javac.comp.Attr.attribStats(Attr.java:680)
        at com.sun.tools.javac.comp.Attr.visitBlock(Attr.java:1127)
        at com.sun.tools.javac.tree.JCTree$JCBlock.accept(JCTree.java:903)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:597)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:665)
        at com.sun.tools.javac.comp.Attr.visitMethodDef(Attr.java:1020)
        at
com.sun.tools.javac.tree.JCTree$JCMethodDecl.accept(JCTree.java:772)
        at com.sun.tools.javac.comp.Attr.attribTree(Attr.java:597)
        at com.sun.tools.javac.comp.Attr.attribStat(Attr.java:665)
        at com.sun.tools.javac.comp.Attr.attribClassBody(Attr.java:4308)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4217)
        at com.sun.tools.javac.comp.Attr.attribClass(Attr.java:4149)
        at com.sun.tools.javac.comp.Attr.attrib(Attr.java:4124)
        at
com.sun.tools.javac.main.JavaCompiler.attribute(JavaCompiler.java:1252)
        at
com.sun.tools.javac.main.JavaCompiler.compile2(JavaCompiler.java:904)
        at
com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:864)
        at com.sun.tools.javac.main.Main.compile(Main.java:530)
        at
com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:129)
        at
com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:138)
        at alice.util.proxyGenerator.Generator.compile(Generator.java:58)
        at alice.util.proxyGenerator.Generator.make(Generator.java:48)
        at alice.tuprolog.lib.OOLibrary.new_lambda_3(OOLibrary.java:287)
        at java.lang.reflect.Method.invoke(Method.java:472)
        at
alice.tuprolog.PrimitiveInfo.evalAsPredicate(PrimitiveInfo.java:123)
        at
alice.tuprolog.StateGoalEvaluation.doJob(StateGoalEvaluation.java:42)
        at alice.tuprolog.Engine.run(Engine.java:78)
        at alice.tuprolog.EngineRunner.solve(EngineRunner.java:179)
        at alice.tuprolog.EngineManager.solve(EngineManager.java:227)
        at alice.tuprolog.Prolog.solve(Prolog.java:435)
        at alice.tuprolog.Prolog.solve(Prolog.java:455)
        at alice.tuprologx.ide.EngineThread.run(EngineThread.java:52)
Compile failed:
public class MyLambdaFunction1 {
  public java.util.function.BiFunction<String,String,Integer> getFunction()
{
                return (s1,s2) -> s1.indexOf(s2);
  }
}

Does anybody have any idea?

Thank you,
Alessandro

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