Accessing secured ODATA service in Java

[teiiduser]

Hello,

We have an ODATA service in place and I am trying to write a consumer in Java. So here is the code so far:

public class TestReadWrite{

  public static final String endpoint="http://localhost:8080/mydataserver/dsl.svc/";

  public static void main(String[] args) {

  TestReadWrite example = new TestReadWrite();

     example.run(args);

  }

  private void run(String[] args) {

  ODataConsumer c = ODataJerseyConsumer.create(endpoint);

  // list all products

    for (OEntity product : c.getEntities("Products").execute()) {

      reportEntity("Products: " + product.getProperty("name").getValue(), product);

    }

  }

}

This is a secured ODATA service so I get the error: Exception in thread "main" java.lang.RuntimeException: Expected status OK, found Unauthorized. Server response:

How do I pass the username/password to this service?I tried searching but did not find a decent example. Can anyone help with a code snippet or any clear documentation on the same?

Thank you!

[rareddy]

This seems like good question to framework that supplied ODataJerseyConsumer class, in this case I guess it is OData4J.

[teiiduser]

Yes. OData4j

[shawkins]

See https://searchcode.com/codesearch/view/9368038/

//ODataConsumer c = ODataJerseyConsumer.create(endpoint);

OClientBehavior basicAuth = OClientBehaviors.basicAuth("user", "password");

ODataConsumer c = ODataJerseyConsumer.newBuilder(endpoint).setClientBehaviors(basicAuth).build();

[teiiduser]

What could be the reason for this runtime exception. Doesnt give much information:

Exception in thread "main" java.lang.RuntimeException: com.ctc.wstx.exc.WstxEOFException: Unexpected EOF in prolog

at [row,col {unknown-source}]: [1,0]

  at org.odata4j.core.Throwables.propagate(Throwables.java:11)

  at org.odata4j.stax2.staximpl.StaxXMLFactoryProvider2$StaxXMLEventReader2.nextEvent(StaxXMLFactoryProvider2.java:113)

  at org.odata4j.format.xml.EdmxFormatParser.parseMetadata(EdmxFormatParser.java:55)

  at org.odata4j.consumer.AbstractODataClient.getMetadata(AbstractODataClient.java:44)

  at org.odata4j.consumer.AbstractODataConsumer$CachedEdmDataServices.refreshDelegate(AbstractODataConsumer.java:212)

  at org.odata4j.consumer.AbstractODataConsumer$CachedEdmDataServices.getDelegate(AbstractODataConsumer.java:205)

  at org.odata4j.internal.EdmDataServicesDecorator.findEdmEntitySet(EdmDataServicesDecorator.java:46)

  at org.odata4j.consumer.AbstractODataConsumer$CachedEdmDataServices.findEdmEntitySet(AbstractODataConsumer.java:221)

  at org.odata4j.consumer.AbstractODataConsumer.getFeedCustomizationMapping(AbstractODataConsumer.java:235)

  at org.odata4j.consumer.AbstractODataConsumer.getEntity(AbstractODataConsumer.java:99)

  at org.odata4j.consumer.AbstractODataConsumer.getEntity(AbstractODataConsumer.java:91)

  at org.odata4j.consumer.AbstractODataConsumer.getEntity(AbstractODataConsumer.java:83)

  at com.lgc.test.TestReadWrite.run(TestReadWrite.java:36)

  at com.lgc.test.TestReadWrite.main(TestReadWrite.java:24)

Caused by: com.ctc.wstx.exc.WstxEOFException: Unexpected EOF in prolog

at [row,col {unknown-source}]: [1,0]

  at com.ctc.wstx.sr.StreamScanner.throwUnexpectedEOF(StreamScanner.java:677)

  at com.ctc.wstx.sr.BasicStreamReader.handleEOF(BasicStreamReader.java:2119)

  at com.ctc.wstx.sr.BasicStreamReader.nextFromProlog(BasicStreamReader.java:2025)

  at com.ctc.wstx.sr.BasicStreamReader.next(BasicStreamReader.java:1117)

  at org.codehaus.stax2.ri.Stax2EventReaderImpl.nextEvent(Stax2EventReaderImpl.java:255)

  at org.odata4j.stax2.staximpl.StaxXMLFactoryProvider2$StaxXMLEventReader2.nextEvent(StaxXMLFactoryProvider2.java:111)

  ... 12 more

[shawkins]

If the server is returning a non-xml formatted 401 / unauthorized response, then you could see an exception like that.

[teiiduser]

How can I check that extra log information? In the Java console I see only the above error.

Also my service actually needs an extra parameter.. so when I access my service I have to put this in the browser:

http://localhost/mydataserver/dsl.svc/mymodel/1/mymodel-ds?param=value

but the endpoint in my java program is http://localhost/mydataserver/dsl.svc/mymodel/1/mymodel-ds

Would that be causing this problem? How do I pass this parameter?

Also would it matter if the service is using a different type of authentication, for eg: forms based?

[shawkins]

> How can I check that extra log information?

That would be the server log.

> Would that be causing this problem? How do I pass this parameter?

Seems like that would just be part of your endpoint, but if you are thinking something else you should check the jersey docs.

> Also would it matter if the service is using a different type of authentication, for eg: forms based?

Are you talking about a Teiid odata service?

[teiiduser]

If you mean the JBOSS server log, it does not show anything regarding this error.

[teiiduser]

Does anyone know the syntax to do form based authentication in java for ODATA service?

[rareddy]

It would be specific to that form as what that form submission target is, and typically you need to execute a POST with form parameter values against the endpoint. As far as Teiid OData is concerned we only support BasicAuth right now OOB.