How to set XStream mode in kie-server to use id/reference

[Giovanni Martano]

I'm tryng optaplanner xml solution posting sample data to kie-server (ver. 7.11-FINAL)  on wildfly11, via REST API (using SOAP-UI). 

I deployed some sample project via kie-wb and I can successfully test  sample xml with XPath reference to previous fact, so I can submit the XML data and get the best-solution calling the related endpoint.

But when I try to use id/reference for previous fact i get the com.thoughtworks.xstream.converters.ConversionException: Invalid reference error pointing to the xml line where I change XPath reference with id/reference. I found that XStream has a setting to process the incoming xml in the right way (XStream.ID_REFERENCES), but I canno't found in the kie-wb/kie-server how to set this mode.

Any help is very appreciated, thanks

Giovanni

[Giovanni Martano]

I open a RFE on jboss jira   https://issues.jboss.org/browse/DROOLS-3075

[Maciej Swiderski]

Could you provide bit more information how you interact between workbench and kie server and where do you want to have the xstream option enabled?

Maciej

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[Giovanni Martano]

Hi Maciej, thanks for your reply....well, I'm using kie-wb trought the GUI (I deployed kie-drools-wb and kie-server on wildlfy 11) to create a sample (optaplanner) project and deploy it in kie-server instance (using the deploy feature of kie-wb GUI). Then I interact with kie-server via rest api endpoints using SOAP-UI as client.

I don't know where is the best place to put the necessary xstream setting, I only found that in the scenario I described above I can't use xstream id_references mode option (kie-server respond with the reported error).

If it can be in the http header of rest request or in xml solver config, or in another place... I really don't know ...I'm not the right person to suggest where :-)

[Maciej Swiderski]

Giovanni,

You can set following HTTP header for the request to instruct kie server that the content and the response should be in xstream format

Name: X-KIE-ContentType

Value: XSTREAM

Is that what you are after?

Maciej

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[Giovanni Martano]

Well, but I know this feature and I already setted the header when submit xml, the problem is that when in xml body of solution  I try to use id/reference (instead of XPath) for previous fact i get the com.thoughtworks.xstream.converters.ConversionException: Invalid reference error pointing to the xml line where I change XPath reference with id/reference. I found that XStream has a setting to process the incoming xml in the right way (XStream.ID_REFERENCES), but I canno't found in the kie-wb/kie-server how to set this mode.

To be more clear, the following XML work well (where I use Xpath for reference):

<TeamRoster>
        <employeeList>
            <Employee>
                <name>Luigi</name>
            </Employee>
            <Employee>
                <name>Mauro</name>
            </Employee>
            <Employee>
                <name>Pietro</name>
            </Employee>
            <Employee>
                <name>Gino</name>
            </Employee>
        </employeeList>
        <teamList>
            <Team>
                <name>Squadra 1</name>
                <employeeList>
                    <Employee reference="../../../../employeeList/Employee"/>
                    <Employee reference="../../../../employeeList/Employee[2]"/>
                </employeeList>
                .........

With this one, instead, I receive from kie-server (after submit xml via rest with SOAP-UI client) com.thoughtworks.xstream.converters.ConversionException: Invalid reference:

        <TeamRoster id="1">
            <employeeList id="2">
                <Employee id="3">
                    <id>0</id>
                    <name>Luigi</name>
                </Employee>
                <Employee id="4">
                    <id>1</id>
                    <name>Mauro</name>
                </Employee>
                <Employee id="5">
                    <id>2</id>
                    <name>Pietro</name>
                </Employee>
                <Employee id="6">
                    <id>3</id>
                    <name>Gino</name>
                </Employee>
            </employeeList>
            <teamList id="7">
                <Team id="8">
                    <id>0</id>
                    <name>Squadra 1</name>
                    <employeeList id="9">
                        <Employee reference="3"/>
                        <Employee reference="4"/>
                    </employeeList>

The difference is, as you can see, that I change reference to previous fact with id's instead of XPath.

On stackoverflow Geoffrey De Smet (Lead optaplanner sw dev) reply that XStream has a setting param to process well this type of xml, using in code it will be

xStream = new XStream();
xStream.setMode(XStream.ID_REFERENCES);

But I'm using kie-wb GUI do develop and kie-server for deploy my project, so I have no access directly to XStream library to set this param. So, i conclude, that must be (it will be appreciated) present in some place on kie-server the possibility to set this param, and describe as sample (suggested by Geoffrey) the http parameter to switch between xstream xml, jaxb xml . I hope it's clear the use-case scenario :-) 

[Giovanni Martano]

Last but not least, XML with XPath reference is very hard to read for users and to produce dinamically for app that post/get xml data via rest api to kie-server.

[Maciej Swiderski]

Ok, now it’s more clear, thanks.

You could already do it by implementing org.kie.server.api.marshalling.xstream.XStreamMarshallerExtension and package this in a jar with services file (follow Java SE ServiceLoader approach). Once you have the jar file place it to the same class path as kie-server-api module is - make sure you have this jar on both client and server side.

Maciej

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[Giovanni Martano]

Thanks Maciej for your prompt reply, but I'm using Optaplanner 7.11FINAL (kie-wb + kie-server), not drools/optaplanner jars with custom java project, so how I can implement this extension? When i create asset via kie-wb GUI? What type of asset?

Thanks again

[Maciej Swiderski]

So you need to do the following:

- create maven project

- add dependency to org.kie.server:kie-server-api 

- create class that implements org.kie.server.api.marshalling.xstream.XStreamMarshallerExtension

- implement required methods

- in the extend method add this

XStream xstream = marshaller.getXstream();

xstream.setMode(mode);

- create file src/main/resources/META-INF/services/org.kie.server.api.marshalling.xstream.XStreamMarshallerExtension

- paste into that file fully qualified class name of the class you just created

- mvn clean package

- copy that file into kie-server.war/WEB-INF/lib

- copy that file (or add it as maven dependency) to your custom java project that uses kie server client

- not sure you use any UI to call kie server api from workbench but if you do copy that file to workbench/WEB-INF/lib too

Hope this helps

Maciej

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[Giovanni Martano]

Thanks for details Maciej, but I'm not using any kie client, I'm using a generic rest client (SOAP-UI) because I only need to access via different client (python, android, php)  to kie-server rest endpoints. 

It will work anyway? The jar package I intend.

[Maciej Swiderski]

On 4 Oct 2018, at 11:36, Giovanni Martano <giovanni...@gmail.com> wrote:

Thanks for details Maciej, but I'm not using any kie client, I'm using a generic rest client (SOAP-UI) because I only need to access via different client (python, android, php)  to kie-server rest endpoints. 

It will work anyway? The jar package I intend.

Yes, then you simply need to put this on kie-server.war/WEB-INF/lib

Maciej

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[Giovanni Martano]

I created the maven jar, but under wildfly 11 directory I cannot access any subdir under kie-server.war.

My directory wildfly-11/standalone/deployments/ only contain kie-server.war and kie-server.war.deployed no one sub dir where I can copy the jar :-(

[Maciej Swiderski]

Unzip the kie-server.war file and name the unzipped directory exactly the same kie-server.war (you would have to move the file before that)

Maciej

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[Giovanni Martano]

Well one step is ok, I can submit xml with reference id's withou errors, but when I try to get the solution via rest (calling the endpoint .../bestsolution)

I have this error in the raw response "Unexpected error during processing: Can't marshall input object: SolverInstance{containerId='TRostering_2.0.0', solverId='solver-1', solverConfigFile='com/linkit/trostering/TRosteringSolverConfig.solver.xml', status=SOLVING, scoreWrapper=ScoreWrapper{scoreClass='class org.optaplanner.core.api.score.buildin.hardsoft.HardSoftScore', scoreString='-4hard/-25soft'}}"

[Maciej Swiderski]

That I will leave to OptaPlanner experts … outside of my expertise area…

Maciej

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[Giovanni Martano]

Ok it function If I put in the header X-KIE-ContentType:xstream when I get the xml, but hot to have json? 

[Giovanni Martano]

The solution xml response is wrong, it contain nested xml solution with  facts and solution mixed (?)...nothing done..i must use reference XPath 

[Michael Anstis]

Forwarded to the Optaplanner lead.. there may be a better mailing list to use from now on... 

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[Giovanni Martano]

Thanks for your support Maciej, I rollback my work and avoid tu use id's for the moment

Maciej

Maciej

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[Geoffrey De Smet]

Thanks for forwarding, Michael.

This kie-server feature isn't optaplanner specific though,
although optaplanner use cases might run into it more easily.

In any case, currently kie-server only supports XPath references in XStream as there no way to make kie-server's marshaller call:
  xStream.setMode(XStream.ID_REFERENCES);
through a HTTP parameter.

FWIW, Looks like a duplicate of this optaplanner question:
  https://stackoverflow.com/questions/52623500/optaplanner-7-11-id-reference-error-posting-xml-for-solution-to-kie-server
And specifically this RFE jira:
  https://issues.jboss.org/browse/DROOLS-3075

With kind regards,
Geoffrey De Smet