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Gremlin: getting json response in Java with gremlin-driver

I have the following query:
g
.V("user-11")
.repeat(bothE().subgraph("subGraph").outV())
.times(2)
.cap("subGraph")
.next()
When I run it using gremlin-python, I receive the following response:
{'#type': 'tinker:graph',
'#value': {'vertices': [v[device-3], v[device-1], v[user-11], v[card-1]],
'edges': [e[68bad734-db2b-bffc-3e17-a0813d2670cc][user-11-uses_device->device-1],
e[14bad735-2b70-860f-705f-4c0b769a7849][user-11-uses_device->device-3],
e[f0bb3b6d-d161-ec60-5e6d-068272297f24][user-11-uses_card->card-1]]}}
Which is a Graphson representation of the subgraph obtained by the query.
I want to get the same response using Java and gremlin-driver but I haven't been able to figure how.
My best try was:
ObjectMapper mapper = GraphSONMapper.build().version(GraphSONVersion.V3_0).create().createMapper();
Object a = graphTraversalSource
.V(nodeId)
.repeat(bothE().subgraph("subGraph").outV())
.times(2)
.cap("subGraph")
.next();
return mapper.writeValueAsString(a);
But that gave me the following error:
io.netty.handler.codec.DecoderException: org.apache.tinkerpop.gremlin.driver.ser.SerializationException: org.apache.tinkerpop.shaded.kryo.KryoException: Encountered unregistered class ID: 65536
I am using AWS Neptune, but I doubt that makes a difference given that I receive the answer I want through gremlin-python.
I appreciate any help you can give! Thanks

As mentioned in the comments
When using Java what you get back will be an actual TinkerGraph
Using the GraphBinary or GraphSONV3D0 serializer is recommended.
The Gyro one is older and is likely causing the error you saw if you did not specify one of the others serializers.
Note that even if you use one of the other serializers, to get the graph to deserialize into JSON you will need to use the specific TinkerGraph serializer (see the end of this answer for an example). Otherwise you will just get {} returned.
However, you may not need to produce JSON at all in the case of the Java Gremlin client ....
Given you have an actual TinkerGraph back you can run real Gremlin queries against the in-memory subgraph - just create a new traversal source for it. You can also use the graph.io classes to write the graph to file should you wish to. The TinkerGraph will include properties as well as edges and vertices.
You can also access the TinkerGraph object directly using statements such as
a.vertices and a.edges
By means of a concrete example, if you have a query of the form
TinkerGraph tg = (TinkerGraph)g.V().bothE().subgraph("sg").cap("sg").next();
Then you can do
GraphTraversalSource g2 = tg.traversal();
Long cv = g2.V().count().next();
Long ce = g2.E().count().next();
Or you can just access the TinkerGraph data structure directly using statements of the form:
Vertex v = tg.vertices[<some-id>]
Or
List properties = tg.vertices[<some-id>].properties()
This actually means you have a lot more power available to you in the Java client when working with subgraphs.
If you still feel that you need a JSON version of your subgraph, the IO reference is a handy bookmark to have: https://tinkerpop.apache.org/docs/3.4.9/dev/io/#_io_reference
EDITED: - to save you a lot of reading the docs, this code will print a TinkerGraph as JSON
mapper = GraphSONMapper.build().
addRegistry(TinkerIoRegistryV3d0.instance()).
version(GraphSONVersion.V3_0).create().createMapper();
mapper.writeValueAsString(tg)

Adding custom step definitions to Karate framework

I have a need to extract a field parsed from a "complex" response header and use that value later in the test.
It seems that the "header" keyword in Karate is set up for setting request headers, not parsing response headers.
Is there a way to add a custom step definition maintaining access to the scenario variable stores? It appears the variable stores are private in the StepDefs class, and there doesn't seem to be a way to extend it easily.

You can get access to the response headers. Please look at the documentation for responseHeaders.
That said, the match header short-cut is most likely what you are looking for.
Karate's philosophy is that you never need to write custom step-definitions.
edit: some examples, sounds like you just need to do some string manipulation of the Location header ? You can freely mix JS code into Karate expressions.
* def location = responseHeaders['Location'][0]
# assume location = 'foo?bar=baz'
* def bar = location.substring(location.indexOf('bar=') + 4)

Creating a filter to check a case for a letter in a field in the json body in REST assured

I have a request in the form of json,which looks like this.
{"User":{"email":"test#test.com","FName":"fname"}}
When I try to send it via REST assured ,the U in the User is seen to change its case.i.e. changes to a lower case.
To send the request I have created my own serialized classes. The end-point is seen like this:
{"user":{"email":"test#test.com","FName":"fname"}}
but somehow it is not changing the case of the remaining fields.I don't knwo why this is happening.
I've even tried to create a filter for a request specification,but couldn't go any further with that too. I also then thought of first converting the serialized object to a gson,and then check the case of the User, still no luck.
Error I get is:
The class, User,does not match the payload object for payload.
Please note I am trying to use the service of another team,so I really don't have an access to their code-base(Although not needed).Observe the space between the first , and user in the above message, is it worth noting?

I finally got away with it by converting the object(JSON) into a JSON string/payload.
And while passing it as a form parameter,passed the string/payload.
Somehow,still couldn't figure out why the formparameter/formparam option in RESTAssured did not allow the serialized object to go through. But,anyway got around it this time.
Thanks for the suggestions all.

Read out custom Header from a Restlet Request

I need to read out a custom header from a Restlet Request.
According to this I tried
Form headers = (Form) request.getAttributes().get("org.restlet.http.headers");
String ltpaToken = headers.getFirstValue("LtpaToken2");
But this results in the following exception:
java.lang.ClassCastException: org.restlet.util.Series cannot be cast to org.restlet.data.Form
Therefore, how can I read out this custom header?
Thanks and best regards
Ben

that was how to achive this in restlet 2.0.x I'm assuming that you are using a more recent version? at 2.1.x try
Series<Header> series = (Series<Header>)getRequestAttributes().get("org.restlet.http.headers");
series.getFirst("LtpaToken2");
there was mention of a short cut method, so that you did not need the magic String org.restlet.http.headers but I'm not sure which version that was / is being introduced in.

You can also use the org.restlet.engine.header.HeaderConstants#ATTRIBUTE_HEADERS class variable instead of "org.restlet.http.headers".
If you're not afraid of class casting:
((HttpRequest) getRequest()).getHeaders();

PHP how to consume SOAP web services?

I'm very new in using web services. Appreciate if anyone can help me on this.
In my PHP codes, I'm trying to use the SOAP web services from another server (JIRA, java). The JIRA SOAP API is shown here.
$jirasoap = new SoapClient($jiraserver['url']);
$token = $jirasoap->login($jiraserver['username'], $jiraserver['password']);
$remoteissue = $jirasoap->getIssue($token, "issuekey");
I found that my codes have no problem to call the functions listed on that page. However, I don't know how to use the objects returned by the API calls.
My question are:
In my PHP codes, how can I use the methods in the Java class objects returned by SOAP API calls?
For example, the function $remoteissue = $jirasoap->getIssue($a, $b) will return a RemoteIssue. Based on this (http://docs.atlassian.com/rpc-jira-plugin/latest/com/atlassian/jira/rpc/soap/beans/RemoteIssue.html), there are methods like getSummary, getKey, etc. How can I use these functions in my codes?
Based on some PHP examples I found from the internet, it seems that everyone is using something like this:
$remoteissue = $jirasoap->getIssue($token, "issuekey");
$key = $remoteissue->key;
They are not using the object's methods.
Refer to this example, it seems that someone is able to do this in other languages. Can it be done in PHP too?
The problem I'm facing is that, I am trying to get the ID of an Attachment. However, it seems that we can't get the Attachment ID using this method: $attachmentid = $remoteattachment->id;. I am trying to use the $remoteattachment->getId() method.
In PHP codes, after we made a SOAP API call and received the returned objects, how do we know what data fields are available in that object?
For example,
$remoteissue = $jirasoap->getIssue($token, "issuekey");
$summary = $remoteissue->summary;
How do we know ->summary is available in $remoteissue?
When i refer to this document (http://docs.atlassian.com/rpc-jira-plugin/latest/com/atlassian/jira/rpc/soap/beans/RemoteIssue.html), I don't see it mention any data fields in RemoteIssue. How do we know we can get key, summary, etc, from this object? How do we know it is ->summary, not ->getsummary? We need to use a web browser to open the WSDL URL?
Thanks.

This question is over one year old, but to share knowledge and provide an answer to people who have this same question and found this page, here are my findings.
The document mentioned in the question is an overview of the JiraSoapService interface. This is a good reference for what functions can be called with which arguments and what they return.
If you use Java for your Jira SoapClient the returned objects are implemented, but if you use PHP, the returned objects aren't of the type stated in this documentation and do not have any of the methods mentioned. The returned objects are instances of the internal PHP class stdClass, which is a placeholder for undefined objects. The best way to know what is returned is to use var_dump() on the objects returned from the SoapCalls.
$jirasoap = new SoapClient($jiraserver['url']);
$token = $jirasoap->login($jiraserver['username'], $jiraserver['password']);
$remoteissue = $jirasoap->getIssue($token, "PROJ-1");
var_dump($remoteissue);
/* -- You will get something like this ---
object(stdClass)#2 (21) {
["id"]=> string(3) "100"
["affectsVersions"]=> array(0) { }
["assignee"]=> string(4) "user"
...
["created"]=> string(24) "2012-12-13T09:27:49.934Z"
...
["description"]=> string(17) "issue description"
....
["key"]=> string(6) "PROJ-1"
["priority"]=> string(1) "3"
["project"]=> string(4) "PROJ"
["reporter"]=> string(4) "user"
["resolution"]=> NULL
["status"]=> string(1) "1"
["summary"]=> string(15) "Project issue 1"
["type"]=> string(1) "3"
["updated"]=> string(24) "2013-01-21T16:11:43.073Z"
["votes"]=> int(0)
}
*/
// You can access data like this:
$jiraKey = $remoteissue->key;
$jiraProject = $remoteissue->project;

The document you referred to in #2 is to a Java implementation and really doesn't give you any help with PHP. If they do not publish a public API for their service (which would be unusual), then using the WSDL as a reference will let you know what objects and methods are accepted by the service and you can plan your method calls accordingly.
The technique you used to call getIssue(...) seems fine, although you should consider using try...catch in case of a SoapException.

I have used Jira SOAP in .NET project and IntelliSense hinted me what fields are available for returned object.
You can use something like VS.Php for Visual Studio or Php for Visual Studio if you are using Visual Studio.
Or you can choose one of the IDEs from here with support of IntelliSense.