Use the JAXBContext.newInstance(...) method which takes a list of
package names
JAXBContext.newInstance("com.acme.foo:com.acme.bar")
instead of JAXBContext.newInstance method that takes a list of classes.
See javadoc for
https://jaxb.dev.java.net/nonav/jaxb20-pfd/api/javax/xml/bind/JAXBContext.html
.
Sekhar
Moravec Jan wrote:
>Hi,
>
>I have written a simple Ant task that uses JAXB (jaxb-ri-20060607) to create GraphML XML instances describing JAR-level dependencies between 3rd party JARs and my project module JARs (helpful when one wants to update a 3rd party JAR and want to see which of project modules and 3rd party libs will be affected).
>
>I am using GraphML XSD schemas with yWorks extensions (http://www.yworks.com/en/products_yfiles_ep_graphml.htm) to generate Java classes for the content tree objects. That goes fine, but when I populate these objects and attempt to marchall the content tree I receive the following exception:
>
>[findlibdeps] 26.7.2006 17:05:45 javax.xml.bind.ContextFinder newInstance
>[findlibdeps] FINE: Trying to load com.sun.xml.bind.v2.ContextFactory
>[findlibdeps] 26.7.2006 17:05:45 javax.xml.bind.ContextFinder newInstance
>[findlibdeps] FINE: loaded com.sun.xml.bind.v2.ContextFactory from jar:file:/c:/Java/e/lib/jaxb/jaxb-impl.jar!/com/sun/xml/bind/v2/ContextFactory.class
>[findlibdeps] Error marschalling dependency graph: org.graphdrawing.graphml.xmlns.graphml.GraphmlType_at_33f0de
>[findlibdeps] com.sun.xml.bind.v2.runtime.IllegalAnnotationsException: 1 counts of IllegalAnnotationExceptions
>[findlibdeps] There's no ObjectFactory with an @XmlElementDecl for the element {http://www.yworks.com/xml/graphml}ProxyShapeNode.
>[findlibdeps] this problem is related to the following location:
>[findlibdeps] at protected java.util.List org.graphdrawing.graphml.xmlns.graphml.DataExtensionType.content
>[findlibdeps] at org.graphdrawing.graphml.xmlns.graphml.DataExtensionType
>[findlibdeps] at org.graphdrawing.graphml.xmlns.graphml.DefaultType
>[findlibdeps] at protected org.graphdrawing.graphml.xmlns.graphml.DefaultType org.graphdrawing.graphml.xmlns.graphml.KeyType._default
>[findlibdeps] at org.graphdrawing.graphml.xmlns.graphml.KeyType
>[findlibdeps] at protected java.util.List org.graphdrawing.graphml.xmlns.graphml.GraphmlType.key
>[findlibdeps] at org.graphdrawing.graphml.xmlns.graphml.GraphmlType
>[findlibdeps] at com.sun.xml.bind.v2.runtime.IllegalAnnotationsException$Builder.check(IllegalAnnotationsException.java:66)
>[findlibdeps] at com.sun.xml.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:364)
>[findlibdeps] at com.sun.xml.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:216)
>
>The generated JAXB classes are in two packages:
>
>org.graphdrawing.graphml.xmlns.graphml - standard GraphML types
>com.yworks.xml.graphml - yWorks GraphML extension types
>
>The error would indicate that JAXB has problems finding the ObjectFactory for the ProxyShapeNode. I thought it was because I did not include the com.yworks.xml.graphml package into the list of packages the JAXBContext gets initialized with. However, later on I added that package, but to no avail.
>
>This is how I obtain the JAXBContext:
>
>JAXBContext jaxb = JAXBContext.newInstance( GraphmlType.class, ProxyShapeNodeType.class );
>
>GraphmlType.class - is from the org.graphdrawing.graphml.xmlns.graphml package.
>
>ProxyShapeNodeType.class - is from the GraphML extension (com.yworks.xml.graphml) package. I used this class as there was no "root" object in the extension package, so I just picked this one when JAXB started complaining about it. I expect I would get the same result with any class from the GraphML extension package.
>
>My poor understanding of JAXB internals is that JAXB merely extracts package names from the classes passed to JAXBContext.newInstance method and uses them to obtain a list of ObjectFactory instances. These are then consulted to handle individual content tree types.
>
>I checked the com.yworks.xml.graphml.ObjectFactory to see what is has to say about the ProxyShapeNode and it contains:
>
> /**
> * Create an instance of {_at_link JAXBElement }{_at_code <}{_at_link ProxyShapeNodeType }{_at_code >}}
> *
> */
> @XmlElementDecl(namespace = "http://www.yworks.com/xml/graphml", name = "ProxyShapeNode")
> public JAXBElement<ProxyShapeNodeType> createProxyShapeNode(ProxyShapeNodeType value) {
> return new JAXBElement<ProxyShapeNodeType>(_ProxyShapeNode_QNAME, ProxyShapeNodeType.class, null, value);
> }
>
>Because the exception says JAXB detected problem related to org.graphdrawing.graphml.xmlns.graphml.DataExtensionType.content, I checked the DataExtensionType and it has:
>
>public class DataExtensionType {
>
> @XmlElementRefs({
> @XmlElementRef(name = "ProxyShapeNode", namespace = "http://www.yworks.com/xml/graphml", type = JAXBElement.class),
> @XmlElementRef(name = "ImageNode", namespace = "http://www.yworks.com/xml/graphml", type = JAXBElement.class),
> ....
>
>The problematic ProxyShapeNode is the first annotated element reference. The element name and namespace seem to match the @XmlElementDecl in the ObjectFactory above.
>
>So I am kinda lost as to which @XmlElementDecl is missing and where, or what else is wrong. Any help is greately appreciated.
>
>Thank you,
>Jan
>
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