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Home » Eclipse Projects » EclipseLink » Possible BUG: @XmlPaths and 'Self Mappings' (Using @XmlElements with @XmlPaths allows me to represent schema choices, but what if one of the elements is a 'Self' mapping)
Possible BUG: @XmlPaths and 'Self Mappings' [message #1714554] Fri, 13 November 2015 14:09
J F is currently offline J FFriend
Messages: 256
Registered: July 2009
Senior Member
Suppose I have a schema with a type which has an inner choice;

    <complexType name="RootType">
    	<sequence minOccurs="1" maxOccurs="1">
    		<choice>
    			<sequence minOccurs="1" maxOccurs="1">
    				<element name="A" type="tns:A"></element>
    				<element name="B" type="tns:B"></element>
    				<element name="C" type="tns:C"></element>
    			</sequence>
    			<element name="P" type="tns:P" minOccurs="1" maxOccurs="1"></element>
    			<element name="Q" type="tns:Q" minOccurs="1" maxOccurs="1"></element>
    		</choice>
    	</sequence>
    </complexType>


I might want to represent the sequence of A, B, C by a wrapping java class to distinguish it from the P or Q. I represent structure which as no name using MOXy's 'self mappings';

@XmlAccessorType(XmlAccessType.NONE)
@XmlType(name = "RootType", propOrder = {
    "seq1",
    "p",
    "q"
})
@XmlRootElement(name="TopLevel")
public class RootType {


    @XmlPath(".")
    private InnerSequence seq1;
    @XmlElement(name = "P")
    private P p;
    @XmlElement(name = "Q")
    private Q q;
    
    public static class InnerSequence 
    {
    	@XmlElement(name = "A")
        public A a;
        @XmlElement(name = "B")
        public B b;
        @XmlElement(name = "C")
        public C c;
     }
}


See this previous question and answer

But suppose I prefered to represent that in a way more natural to a schema choice;

@XmlAccessorType(XmlAccessType.NONE)
@XmlType(name = "RootType2", propOrder = {
    "choice1"
})
@XmlRootElement(name="TopLevel2")
public class RootType2 {
 
	
    @XmlPaths({
    	@XmlPath("."),
    	@XmlPath("P"),
    	@XmlPath("Q"),
    	})
    @XmlElements({
    	 @XmlElement(type=InnerSequence.class),
    	 @XmlElement(name = "P", type=P.class),
    	 @XmlElement(name = "Q", type=Q.class),
    })
    public Object choice1;
    
    public static class InnerSequence 
    {
    	@XmlElement(name = "A")
        public A a;
        @XmlElement(name = "B")
        public B b;
        @XmlElement(name = "C")
        public C c;
    }
}


Moxy will marshall

RootType2 root1 = new RootType2();
		InnerSequence inner1 = new InnerSequence();
		root1.choice1 = inner1;
		inner1.a = new A();
		inner1.b = new B();
		inner1.c = new C();
		inner1.a.setOne("Hello One A");
		inner1.b.setOne("Hello One B");
		inner1.c.setOne("Hello One C");


as expected to

<?xml version="1.0" encoding="UTF-8"?>
<TopLevel2 xmlns="http://www.example.org/Schema1">
   <A>
      <one>Hello One A</one>
   </A>
   <B>
      <one>Hello One B</one>
   </B>
   <C>
      <one>Hello One C</one>
   </C>
</TopLevel2>


But when I unmarshall it RootType2 is empty; on remarshalling I get;

<?xml version="1.0" encoding="UTF-8"?>
<TopLevel2 xmlns="http://www.example.org/Schema1"/>


Okay, so perhaps I need to kick MOXy into life by telling it somehow that InnerSequence should be mapped if A or B or C are in TopLevel, so I try this XPath (having checked that it works in standalone java);

public class RootType2 {
 
	
    @XmlPaths({
    	@XmlPath("self::node()[A|B|C]/."),
    	@XmlPath("P"),
    	@XmlPath("Q"),
    	})
    @XmlElements({
    	 @XmlElement(type=InnerSequence.class),
    	 @XmlElement(name = "P", type=P.class),
    	 @XmlElement(name = "Q", type=Q.class),
    })
    public Object choice1;

...


I then cannot Marshall, getting an NPE:

javax.xml.bind.MarshalException
 - with linked exception:
[javax.xml.bind.MarshalException
 - with linked exception:
[java.lang.NullPointerException]]
	at org.eclipse.persistence.jaxb.JAXBMarshaller.marshal(JAXBMarshaller.java:508)
	at uk.co.his.test.complexSequenceAndChoice.TestSchema3.testNACT1_jaxb(TestSchema3.java:63)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:497)
	at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:50)
	at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12)
	at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:47)
	at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:17)
	at org.junit.runners.ParentRunner.runLeaf(ParentRunner.java:325)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:78)
	at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:57)
	at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290)
	at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71)
	at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288)
	at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58)
	at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268)
	at org.junit.internal.runners.statements.RunBefores.evaluate(RunBefores.java:26)
	at org.junit.runners.ParentRunner.run(ParentRunner.java:363)
	at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86)
	at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:675)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382)
	at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192)
Caused by: javax.xml.bind.MarshalException
 - with linked exception:
[java.lang.NullPointerException]
	at org.eclipse.persistence.jaxb.JAXBMarshaller.marshal(JAXBMarshaller.java:487)
	at org.eclipse.persistence.jaxb.JAXBMarshaller.marshal(JAXBMarshaller.java:501)
	... 25 more
Caused by: java.lang.NullPointerException
	at org.eclipse.persistence.oxm.record.OutputStreamRecord.outputStreamWrite(OutputStreamRecord.java:581)
	at org.eclipse.persistence.oxm.record.OutputStreamRecord.outputStreamWrite(OutputStreamRecord.java:568)
	at org.eclipse.persistence.oxm.record.FormattedOutputStreamRecord.openStartElement(FormattedOutputStreamRecord.java:120)
	at org.eclipse.persistence.oxm.record.MarshalRecord.openStartGroupingElements(MarshalRecord.java:482)
	at org.eclipse.persistence.internal.oxm.XMLCompositeObjectMappingNodeValue.marshalSingleValue(XMLCompositeObjectMappingNodeValue.java:168)
	at org.eclipse.persistence.internal.oxm.XMLChoiceObjectMappingNodeValue.marshalSingleValue(XMLChoiceObjectMappingNodeValue.java:155)
	at org.eclipse.persistence.internal.oxm.XMLChoiceObjectMappingNodeValue.marshal(XMLChoiceObjectMappingNodeValue.java:106)
	at org.eclipse.persistence.internal.oxm.NodeValue.marshal(NodeValue.java:102)
	at org.eclipse.persistence.internal.oxm.record.ObjectMarshalContext.marshal(ObjectMarshalContext.java:59)
	at org.eclipse.persistence.internal.oxm.XPathNode.marshal(XPathNode.java:443)
	at org.eclipse.persistence.internal.oxm.XPathNode.marshal(XPathNode.java:424)
	at org.eclipse.persistence.internal.oxm.XPathObjectBuilder.buildRow(XPathObjectBuilder.java:243)
	at org.eclipse.persistence.internal.oxm.TreeObjectBuilder.buildRow(TreeObjectBuilder.java:118)
	at org.eclipse.persistence.internal.oxm.TreeObjectBuilder.buildRow(TreeObjectBuilder.java:1)
	at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:766)
	at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshalStreamOrWriter(XMLMarshaller.java:1147)
	at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:934)
	at org.eclipse.persistence.internal.oxm.XMLMarshaller.marshal(XMLMarshaller.java:877)
	at org.eclipse.persistence.


Is there any way to use a Self Mapping in conjunction with an @XmlPaths and @XmlElements?

[Updated on: Fri, 13 November 2015 15:11]

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