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  1. Drools
  2. DROOLS-329

ClassFormatException when compile template with latest JDK8 (b114)

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    • Icon: Bug Bug
    • Resolution: Done
    • Icon: Major Major
    • 5.5.1.Final, 6.3.0.CR1
    • 5.5.0.Final, 6.0.0.CR5
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      Use Janino compiler, which can be done with these steps:

      • Add -Ddrools.dialect.java.compiler=JANINO to JVM System properties
      • Add Janino to classpath. With maven it can be done by adding this dependency into pom.xml: 
        <dependency>
  <groupId>org.codehaus.janino</groupId>
  <artifactId>janino</artifactId>
  <version>2.5.16</version>
 </dependency>
      Show
      Use Janino compiler, which can be done with these steps: Add -Ddrools.dialect.java.compiler=JANINO to JVM System properties Add Janino to classpath. With maven it can be done by adding this dependency into pom.xml: <dependency> <groupId>org.codehaus.janino</groupId> <artifactId>janino</artifactId> <version>2.5.16</version> </dependency>

      When trying to run code for compile templates with latest JDK8 (For instance this example https://github.com/droolsjbpm/drools/blob/master/drools-examples/src/main/java/org/drools/examples/templates/SimpleRuleTemplateExample.java )
      it will throw an exception like this:

      Exception in thread "main" java.lang.RuntimeException: java.lang.RuntimeException: wrong class format
	at org.drools.template.parser.DefaultTemplateRuleBase.readRule(DefaultTemplateRuleBase.java:148)
	at org.drools.template.parser.DefaultTemplateRuleBase.<init>(DefaultTemplateRuleBase.java:62)
	at org.drools.template.parser.TemplateDataListener.<init>(TemplateDataListener.java:74)
	at org.drools.decisiontable.ExternalSpreadsheetCompiler.compile(ExternalSpreadsheetCompiler.java:95)
	at org.drools.decisiontable.ExternalSpreadsheetCompiler.compile(ExternalSpreadsheetCompiler.java:81)
	at org.drools.examples.templates.SimpleRuleTemplateExample.buildKBase(SimpleRuleTemplateExample.java:84)
	at org.drools.examples.templates.SimpleRuleTemplateExample.executeExample(SimpleRuleTemplateExample.java:49)
	at org.drools.examples.templates.SimpleRuleTemplateExample.main(SimpleRuleTemplateExample.java:43)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:483)
	at com.intellij.rt.execution.application.AppMain.main(AppMain.java:120)
Caused by: java.lang.RuntimeException: wrong class format
	at org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:263)
	at org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:203)
	at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:102)
	at org.eclipse.jdt.internal.compiler.lookup.UnresolvedReferenceBinding.resolve(UnresolvedReferenceBinding.java:49)
	at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.resolveType(BinaryTypeBinding.java:122)
	at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getTypeFromTypeSignature(LookupEnvironment.java:1188)
	at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getTypeFromVariantTypeSignature(LookupEnvironment.java:1244)
	at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getTypeArgumentsFromSignature(LookupEnvironment.java:1031)
	at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.getTypeFromTypeSignature(LookupEnvironment.java:1193)
	at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.createMethod(BinaryTypeBinding.java:495)
	at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.createMethods(BinaryTypeBinding.java:577)
	at org.eclipse.jdt.internal.compiler.lookup.BinaryTypeBinding.cachePartsFrom(BinaryTypeBinding.java:327)
	at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.createBinaryTypeFrom(LookupEnvironment.java:640)
	at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.createBinaryTypeFrom(LookupEnvironment.java:619)
	at org.eclipse.jdt.internal.compiler.Compiler.accept(Compiler.java:295)
	at org.eclipse.jdt.internal.compiler.lookup.LookupEnvironment.askForType(LookupEnvironment.java:133)
	at org.eclipse.jdt.internal.compiler.lookup.PackageBinding.getTypeOrPackage(PackageBinding.java:183)
	at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.findImport(CompilationUnitScope.java:465)
	at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.findSingleImport(CompilationUnitScope.java:519)
	at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.faultInImports(CompilationUnitScope.java:368)
	at org.eclipse.jdt.internal.compiler.lookup.CompilationUnitScope.faultInTypes(CompilationUnitScope.java:444)
	at org.eclipse.jdt.internal.compiler.Compiler.process(Compiler.java:752)
	at org.eclipse.jdt.internal.compiler.Compiler.compile(Compiler.java:464)
	at org.drools.commons.jci.compilers.EclipseJavaCompiler.compile(EclipseJavaCompiler.java:389)
	at org.drools.commons.jci.compilers.AbstractJavaCompiler.compile(AbstractJavaCompiler.java:49)
	at org.drools.rule.builder.dialect.java.JavaDialect.compileAll(JavaDialect.java:371)
	at org.drools.compiler.DialectCompiletimeRegistry.compileAll(DialectCompiletimeRegistry.java:46)
	at org.drools.compiler.PackageRegistry.compileAll(PackageRegistry.java:102)
	at org.drools.compiler.PackageBuilder.compileAll(PackageBuilder.java:1006)
	at org.drools.compiler.PackageBuilder.compileAllRules(PackageBuilder.java:842)
	at org.drools.compiler.PackageBuilder.addPackage(PackageBuilder.java:831)
	at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:441)
	at org.drools.compiler.PackageBuilder.addPackageFromDrl(PackageBuilder.java:419)
	at org.drools.template.parser.DefaultTemplateRuleBase.readRule(DefaultTemplateRuleBase.java:139)
	... 12 more
Caused by: org.eclipse.jdt.internal.compiler.classfmt.ClassFormatException
	at org.eclipse.jdt.internal.compiler.classfmt.ClassFileReader.<init>(ClassFileReader.java:372)
	at org.drools.commons.jci.compilers.EclipseJavaCompiler$2.createNameEnvironmentAnswer(EclipseJavaCompiler.java:287)
	at org.drools.commons.jci.compilers.EclipseJavaCompiler$2.findType(EclipseJavaCompiler.java:258)
	... 45 more

      Workaround, which worked for me is to switch to Janino compiler (See Workaround description)

              mfusco@redhat.com Mario Fusco
              mposolda@redhat.com Marek Posolda
              Votes:
              8 Vote for this issue
              Watchers:
              16 Start watching this issue

                Created:
                Updated:
                Resolved: