Created attachment 152419 [details]
example project

and thus can cause uncompilable code after refactoring. The example class is 

    package de.richtercloud.unnecessary.call.to.string;

    import com.orientechnologies.common.util.OCallable;
    import com.orientechnologies.orient.core.metadata.schema.OClass;
    import com.tinkerpop.blueprints.Features;
    import com.tinkerpop.blueprints.impls.orient.OrientBaseGraph;
    import com.tinkerpop.blueprints.impls.orient.OrientEdgeType;
    import com.tinkerpop.blueprints.impls.orient.OrientVertexType;

    /**
     * example taken from orientdb's
     * com.tinkerpop.blueprints.impls.orient.OrientBaseGraph
     *
     * @author richter
     */
    public class UnnecessaryCallToString extends OrientBaseGraph {

        public UnnecessaryCallToString(String url) {
            super(url);
        }

        @Override
        public OrientVertexType createVertexType(final String iClassName) {
            makeActive();

            return createVertexType(iClassName, (String) null);
        }

        @Override
        public OrientEdgeType createEdgeType(final String iClassName) {
            makeActive();

            return createEdgeType(iClassName, (String) null);
        }

        @Override
        public OrientEdgeType createEdgeType(final String iClassName, final String iSuperClassName) {
            return createEdgeType(iClassName, iSuperClassName == null ? getEdgeBaseType() : getEdgeType(iSuperClassName));
        }

        @Override
        public OrientEdgeType createEdgeType(final String iClassName, final OClass iSuperClass) {
            return executeOutsideTx(new OCallable<OrientEdgeType, OrientBaseGraph>() {
                @Override
                public OrientEdgeType call(final OrientBaseGraph g) {
                    return new OrientEdgeType(g, getRawGraph().getMetadata().getSchema().createClass(iClassName, iSuperClass));
                }
            }, "create edge type '", iClassName, "' as subclass of '", iSuperClass.getName(), "'");
        }

        @Override
        public Features getFeatures() {
            throw new UnsupportedOperationException("Not supported yet.");
        }
    }

I created and attached a sample maven project (which depends on orientdb - I don't seem to figure out what the cause is and didn't manage to create a project from scratch).