post vertex exception handling

gistfile1.java

    @POST
    @Path("/{id}")
    public Response postVertex(@PathParam("graphname") String graphName, @PathParam("id") String id) {

        Graph graph = this.getRexsterApplicationGraph(graphName).getGraph();
        Vertex vertex = null;

        try {
            vertex = graph.getVertex(id);
        } catch (RuntimeException re)
        {
            // not sure i like this assumption: everything's ok...in the case of DEX, it could just
            // mean i did not find the vertex i was looking for.
        }

        try {

            if (null == vertex) {
                vertex = graph.addVertex(id);
            } else {
                if (!this.hasElementProperties(this.getRequestObject())) {
                    JSONObject error = generateErrorObjectJsonFail(new Exception("Vertex with id " + id + " already exists"));
                    throw new WebApplicationException(this.addHeaders(Response.status(Status.CONFLICT).entity(error)).build());
                }
            }

            Iterator keys = this.getRequestObject().keys();
            while (keys.hasNext()) {
                String key = keys.next().toString();
                if (!key.startsWith(Tokens.UNDERSCORE)) {
                    vertex.setProperty(key, this.getTypedPropertyValue(this.getRequestObject().getString(key)));
                }
            }

            this.resultObject.put(Tokens.RESULTS, new ElementJSONObject(vertex, this.getReturnKeys(), this.hasShowTypes()));
            this.resultObject.put(Tokens.QUERY_TIME, sh.stopWatch());
        } catch (JSONException ex) {
            logger.error(ex);

            JSONObject error = generateErrorObjectJsonFail(ex);
            throw new WebApplicationException(this.addHeaders(Response.status(Status.INTERNAL_SERVER_ERROR).entity(error)).build());
        }  catch (RuntimeException re) {
            logger.error(re);

            JSONObject error = generateErrorObject(re.getMessage(), re);
            throw new WebApplicationException(this.addHeaders(Response.status(Status.INTERNAL_SERVER_ERROR).entity(error)).build());
        }

        return this.addHeaders(Response.ok(this.resultObject)).build();
    }