private void handleKnowledgeBuilderErrors(KnowledgeBuilder knowledgeBuilder) {
   if (knowledgeBuilder.hasErrors()) {
     StringBuilder builder = new StringBuilder(1024);
     builder.append("Drools " + knowledgeBuilder.getClass().getSimpleName() + " error occurred:");
     for (KnowledgeBuilderError knowledgeBuilderError : knowledgeBuilder.getErrors()) {
       builder.append("Error in line(s) [");
       appendLinesTo(knowledgeBuilderError.getErrorLines(), builder);
       builder.append("]:");
       builder.append(knowledgeBuilderError.getMessage());
     }
     throw new TestFluxException(builder.toString());
   }
 }