JAXB error while marshalling

Question

I am getting this error when i am trying to marshal a JAXB object to XML. The JAXBContext is unable to find the class that i am passing. I am stuck up here. Any help in this regard is highly appreciated.

Exception in thread "main" java.lang.InternalError
    at com.sun.xml.internal.bind.v2.model.annotation.RuntimeInlineAnnotationReader.getClassValue(RuntimeInlineAnnotationReader.java:128)
    at com.sun.xml.internal.bind.v2.model.annotation.RuntimeInlineAnnotationReader.getClassValue(RuntimeInlineAnnotationReader.java:42)
    at com.sun.xml.internal.bind.v2.model.impl.PropertyInfoImpl.isApplicable(PropertyInfoImpl.java:201)
    at com.sun.xml.internal.bind.v2.model.impl.PropertyInfoImpl.getApplicableAdapter(PropertyInfoImpl.java:212)
    at com.sun.xml.internal.bind.v2.model.impl.PropertyInfoImpl.<init>(PropertyInfoImpl.java:111)
    at com.sun.xml.internal.bind.v2.model.impl.SingleTypePropertyInfoImpl.<init>(SingleTypePropertyInfoImpl.java:60)
    at com.sun.xml.internal.bind.v2.model.impl.AttributePropertyInfoImpl.<init>(AttributePropertyInfoImpl.java:48)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeAttributePropertyInfoImpl.<init>(RuntimeAttributePropertyInfoImpl.java:43)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeClassInfoImpl.createAttributeProperty(RuntimeClassInfoImpl.java:144)
    at com.sun.xml.internal.bind.v2.model.impl.ClassInfoImpl.addProperty(ClassInfoImpl.java:851)
    at com.sun.xml.internal.bind.v2.model.impl.ClassInfoImpl.findFieldProperties(ClassInfoImpl.java:387)
    at com.sun.xml.internal.bind.v2.model.impl.ClassInfoImpl.getProperties(ClassInfoImpl.java:290)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeClassInfoImpl.getProperties(RuntimeClassInfoImpl.java:165)
    at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:212)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:89)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:70)
    at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:178)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:84)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:70)
    at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:293)
    at com.sun.xml.internal.bind.v2.model.impl.TypeRefImpl.calcRef(TypeRefImpl.java:81)
    at com.sun.xml.internal.bind.v2.model.impl.TypeRefImpl.getTarget(TypeRefImpl.java:58)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeTypeRefImpl.getTarget(RuntimeTypeRefImpl.java:47)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeTypeRefImpl.getTarget(RuntimeTypeRefImpl.java:40)
    at com.sun.xml.internal.bind.v2.model.impl.ElementPropertyInfoImpl$1.get(ElementPropertyInfoImpl.java:63)
    at com.sun.xml.internal.bind.v2.model.impl.ElementPropertyInfoImpl$1.get(ElementPropertyInfoImpl.java:61)
    at java.util.AbstractList$Itr.next(AbstractList.java:345)
    at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:224)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:89)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:70)
    at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:178)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:84)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:70)
    at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:293)
    at com.sun.xml.internal.bind.v2.model.impl.TypeRefImpl.calcRef(TypeRefImpl.java:81)
    at com.sun.xml.internal.bind.v2.model.impl.TypeRefImpl.getTarget(TypeRefImpl.java:58)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeTypeRefImpl.getTarget(RuntimeTypeRefImpl.java:47)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeTypeRefImpl.getTarget(RuntimeTypeRefImpl.java:40)
    at com.sun.xml.internal.bind.v2.model.impl.ElementPropertyInfoImpl$1.get(ElementPropertyInfoImpl.java:63)
    at com.sun.xml.internal.bind.v2.model.impl.ElementPropertyInfoImpl$1.get(ElementPropertyInfoImpl.java:61)
    at java.util.AbstractList$Itr.next(AbstractList.java:345)
    at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:224)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:89)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:70)
    at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:178)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:84)
    at com.sun.xml.internal.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:70)
    at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:293)
    at com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:308)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.getTypeInfoSet(JAXBContextImpl.java:430)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl.<init>(JAXBContextImpl.java:277)
    at com.sun.xml.internal.bind.v2.runtime.JAXBContextImpl$JAXBContextBuilder.build(JAXBContextImpl.java:1100)
    at com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:143)
    at com.sun.xml.internal.bind.v2.ContextFactory.createContext(ContextFactory.java:110)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:597)
    at javax.xml.bind.ContextFinder.newInstance(ContextFinder.java:202)
    at javax.xml.bind.ContextFinder.find(ContextFinder.java:376)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:574)
    at javax.xml.bind.JAXBContext.newInstance(JAXBContext.java:522)
    at src.example.MarshalCommlAuto.main(MarshalCommlAuto.java:48)

Answer 1

I had the similar problem and this is was the problem with some transitive dependencies on the one of the big project within company (but I didn't get the ClassNotFound exception but that InternalError which points to nowhere). Even when I've used the hint suggested by @Blaise it didn't start work.

So - how I solve the problem? First - I've added the -verbose:class to command line in order to track down the loaded classes. With this I have figured out that some of the classes from my jaxb package (it could be that example package: "com.example.foo") weren't loaded for some reason. So I've added example import for those non-loaded classes from jaxb package and simple usage on the code, like:

ExampleNotLoadedClass.class.getName();

With above code finally during loading this class I've received the ClassNotFound exception with the class from different package. It should be included by some transitive dependencies for this artifact but for some reason this didn't work (I think it doesn't matter, I would only say that we were dividing our big project and extracting some of the artifacts to different subprojects).

So I've added that missing class dependency directly to that problematic artifact and everything had started work fine.

I hope it helps someone in similar problem.

Answer 2

When you create a JAXBContext from a Java class, the JAXB impl will also create metadata for all classes if can reach from it (including property types, super classes, and classes specified in annotations). It will not package scan or pull in subclasses so care needs to be taken to ensure metadata is produced for all classes in your model.

If your model is generated from an XML schema then you should create the JAXBContext from the generated package name. To ensure the classes are loaded correctly you should also specify the correct ClassLoader. Assuming your package name is com.example.foo you can do the following.

JAXBContext jc = JAXBContext.newInstance("com.example.foo", CommlAutoPolicyInfoType.class.getClassLoader());

If your generate model spans multiple packages you separate the packages in context path using the : character.

JAXBContext jc = JAXBContext.newInstance("com.example.foo:com.example.bar", CommlAutoPolicyInfoType.class.getClassLoader());

For More Information

• JAXBContext.newInstance variations