Program: 6597
Project: 6597
Buggy source:
private void attributeConstructor(final MutableInstance instance,final Map<String,MutableInstance> allInstances){
  final JavaClass cl=builder.getClassByName(instance.getType());
  final List<JavaMethod> matchingConstructors=findMatchingConstructors(cl,instance,allInstances);
  sortConstructors(matchingConstructors);
  final List<MutableConstructorArgument> arguments=new ArrayList<MutableConstructorArgument>();
  constructorsearch:   for (  final JavaMethod constructor : matchingConstructors) {
    arguments.clear();
    int i=0;
    parametersearch:     for (    final JavaParameter parameter : constructor.getParameters()) {
      if (i < instance.getConstructorArguments().size()) {
        final MutableConstructorArgument arg=instance.getConstructorArguments().get(i);
        arg.setType(parameter.getType().getValue());
        arg.setPrimitive(parameter.getType().isPrimitive());
        arguments.add(arg);
        i++;
        continue parametersearch;
      }
      if (parameter.getType().isPrimitive()) {
        continue constructorsearch;
      }
      final MutableInstance newInstance;
      newInstance=findInstanceByType(allInstances,instance.getName(),"String_Node_Str" + parameter.getName(),parameter.getType().getValue());
      if (newInstance == null || !newInstance.isAutowireCandidate()) {
        continue constructorsearch;
      }
      final MutableConstructorArgument arg=new MutableConstructorArgument(instance);
      final MutableInstanceReference ref=new MutableInstanceReference(arg,newInstance.getName());
      ref.setReferencedId(newInstance.getId());
      ref.setId("String_Node_Str" + counter++);
      arg.setPrimitive(false);
      arg.setSource(ref);
      arg.setType(newInstance.getType());
      arg.setInstance(instance);
      arguments.add(arg);
    }
    break;
  }
  if (arguments.size() > 0) {
    instance.setConstructorArguments(arguments);
  }
 else {
    throw new RuntimeException("String_Node_Str" + instance.getName() + "String_Node_Str"+ instance.getType());
  }
}

Fixed version (ground truth):
private void attributeConstructor(final MutableInstance instance,final Map<String,MutableInstance> allInstances){
  final JavaClass cl=builder.getClassByName(instance.getType());
  final List<JavaMethod> matchingConstructors=findMatchingConstructors(cl,instance,allInstances);
  sortConstructors(matchingConstructors);
  final List<MutableConstructorArgument> arguments=new ArrayList<MutableConstructorArgument>();
  constructorsearch:   for (  final JavaMethod constructor : matchingConstructors) {
    arguments.clear();
    int i=0;
    int numArgs=instance.getConstructorArguments() == null ? 0 : instance.getConstructorArguments().size();
    parametersearch:     for (    final JavaParameter parameter : constructor.getParameters()) {
      if (i < numArgs) {
        final MutableConstructorArgument arg=instance.getConstructorArguments().get(i);
        arg.setType(parameter.getType().getValue());
        arg.setPrimitive(parameter.getType().isPrimitive());
        arguments.add(arg);
        i++;
        continue parametersearch;
      }
      if (parameter.getType().isPrimitive()) {
        continue constructorsearch;
      }
      final MutableInstance newInstance;
      newInstance=findInstanceByType(allInstances,instance.getName(),"String_Node_Str" + parameter.getName(),parameter.getType().getValue());
      if (newInstance == null || !newInstance.isAutowireCandidate()) {
        continue constructorsearch;
      }
      final MutableConstructorArgument arg=new MutableConstructorArgument(instance);
      final MutableInstanceReference ref=new MutableInstanceReference(arg,newInstance.getName());
      ref.setReferencedId(newInstance.getId());
      ref.setId("String_Node_Str" + counter++);
      arg.setPrimitive(false);
      arg.setSource(ref);
      arg.setType(newInstance.getType());
      arg.setInstance(instance);
      arguments.add(arg);
    }
    break;
  }
  if (arguments.size() > 0) {
    instance.setConstructorArguments(arguments);
  }
 else {
    throw new RuntimeException("String_Node_Str" + instance.getName() + "String_Node_Str"+ instance.getType());
  }
}