private void compileJavaClasses(JavaDialectConfiguration javaConf, ClassLoader classLoader, List<String> javaFiles, String rootFolder) {
if ( !javaFiles.isEmpty() ) {
String[] sourceFiles = javaFiles.toArray( new String[javaFiles.size()] );
JavaCompiler javaCompiler = createCompiler( javaConf, rootFolder );
CompilationResult res = javaCompiler.compile( sourceFiles,
srcMfs,
trgMfs,
classLoader );
for ( CompilationProblem problem : res.getErrors() ) {