code: public Object getValue(InternalWorkingMemory workingMemory,
                             Object object) {
          return MVELSafeHelper.getEvaluator().executeExpression( mvelExpression,
                                         object  );
      }
docs: /* (non-Javadoc)
  @see org.kie.base.extractors.BaseObjectClassFieldExtractor#getValue(java.lang.Object)