Re: Lambda Expressions and JavaCompiler problem

Hi Alessandro,

Are you using the most recent IKVM snapshot?

Regards,
Jeroen

> -----Original Message-----
> From: Alessandro Montanari [mailto:[email protected]]
> Sent: Monday, July 7, 2014 9:43
> To: [email protected]
> Subject: [Ikvm-developers] 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(CurrencyName
> ProviderImpl.java:122)
>         at
> sun.util.locale.provider.CurrencyNameProviderImpl.getSymbol(CurrencyName
> ProviderImpl.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.getLocalizedObjectImp
> l(LocaleServiceProviderPool.java:281)
>         at
> sun.util.locale.provider.LocaleServiceProviderPool.getLocalizedObject(Lo
> caleServiceProviderPool.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$DeferredTypeMap.<init>(DeferredAtt
> r.java:677)
>         at com.sun.tools.javac.comp.Attr.checkMethod(Attr.java:3789)
>         at com.sun.tools.javac.comp.Attr.checkIdInternal(Attr.java:3583)
>         at
> com.sun.tools.javac.comp.Attr.checkMethodIdInternal(Attr.java:3494)
>         at com.sun.tools.javac.comp.Attr.checkMethodId(Attr.java:3468)
>         at com.sun.tools.javac.comp.Attr.checkId(Attr.java:3455)
>         at com.sun.tools.javac.comp.Attr.visitApply(Attr.java:1815)
>         at
> com.sun.tools.javac.tree.JCTree$JCMethodInvocation.accept(JCTree.java:14
> 59)
>         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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