[jboss-jira] [JBoss JIRA] Created: (JBRULES-1640) Packaged rules use StringBuilder even when JavaDialectConfiguration languageLevel set to 1.4

[Brad Koehn (JIRA)]

Packaged rules use StringBuilder even when JavaDialectConfiguration languageLevel set to 1.4
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                 Key: JBRULES-1640
                 URL: http://jira.jboss.com/jira/browse/JBRULES-1640
             Project: JBoss Drools
          Issue Type: Bug
      Security Level: Public (Everyone can see)
          Components: Drl Parser/Builder
    Affects Versions: 4.0.7
         Environment: Java 5/6 for building packages, Java 2 (1.4) for reading them. 
            Reporter: Brad Koehn
         Assigned To: Mark Proctor


When creating a package and serializing it under Java 5/6, and the languageLevel is set to "1.4", Drools will generate code that uses StringBuilder, a class that doesn't exist in Java 1.4. 

Here's some code that is used to generate the package:

		PackageBuilderConfiguration packageBuilderConfiguration = new PackageBuilderConfiguration();
		JavaDialectConfiguration javaDialectConfiguration = (JavaDialectConfiguration) packageBuilderConfiguration
				.getDialectConfiguration("java");
		javaDialectConfiguration.setJavaLanguageLevel("1.4");
		javaDialectConfiguration.setCompiler(JavaDialectConfiguration.JANINO);
		packageBuilderConfiguration.setDialectConfiguration("java",
				javaDialectConfiguration);

Drools (Janino, in this case) generates the correct major/minor version of the classes, so they load correctly under a 1.4 JVM, but I then get a NoClassDefFoundError: java.util.StringBuilder at rule execution time. 

If I build the same package under a 1.4 JVM, Drools doesn't use StringBuilder and the rules execute correctly on a 1.4 JVM. 

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