Failed to generate a schema from the following java file(it comes from http://download.java.net/java/jdk9/docs/api/javax/xml/bind/annotation/XmlAttachmentRef.html):
import javax.xml.bind.annotation.XmlAttachmentRef;
import javax.xml.bind.annotation.XmlElement;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.bind.annotation.XmlAttribute;
import javax.activation.DataHandler;
 
@XmlRootElement
class Foo {
   @XmlAttachmentRef
   @XmlAttribute
   DataHandler data;
 
   @XmlAttachmentRef
   @XmlElement
   DataHandler body;
}
 
with the following error:
schemagen Foo.java
Nov 16, 2016 3:56:54 PM com.sun.tools.internal.jxc.SchemaGenerator run
SEVERE: null
java.lang.reflect.InvocationTargetException
         at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
         at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
         at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
         at java.base/java.lang.reflect.Method.invoke(Method.java:537)
         at jdk.xml.bind@9-ea/com.sun.tools.internal.jxc.SchemaGenerator.run(SchemaGenerator.java:154)
         at jdk.xml.bind@9-ea/com.sun.tools.internal.jxc.SchemaGenerator.run(SchemaGenerator.java:76)
         at jdk.xml.bind@9-ea/com.sun.tools.internal.jxc.SchemaGenerator.main(SchemaGenerator.java:67)
Caused by: java.lang.RuntimeException: java.lang.NullPointerException
         at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.handleExceptions(JavacTaskImpl.java:151)
         at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:100)
         at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:94)
         at jdk.xml.bind@9-ea/com.sun.tools.internal.jxc.SchemaGenerator$Runner.compile(SchemaGenerator.java:254)
         ... 7 more
Caused by: java.lang.NullPointerException
         at jdk.compiler/com.sun.tools.javac.model.JavacTypes.getDeclaredType(JavacTypes.java:235)
         at jdk.xml.bind@9-ea/com.sun.tools.internal.jxc.model.nav.ApNavigator.use(ApNavigator.java:206)
         at jdk.xml.bind@9-ea/com.sun.tools.internal.jxc.model.nav.ApNavigator.use(ApNavigator.java:67)
         at java.xml.bind@9-ea/com.sun.xml.internal.bind.v2.model.core.Adapter.<init>(Adapter.java:73)
         at java.xml.bind@9-ea/com.sun.xml.internal.bind.v2.model.impl.PropertyInfoImpl.<init>(PropertyInfoImpl.java:127)
         at java.xml.bind@9-ea/com.sun.xml.internal.bind.v2.model.impl.SingleTypePropertyInfoImpl.<init>(SingleTypePropertyInfoImpl.java:60)
         at java.xml.bind@9-ea/com.sun.xml.internal.bind.v2.model.impl.AttributePropertyInfoImpl.<init>(AttributePropertyInfoImpl.java:48)
         at java.xml.bind@9-ea/com.sun.xml.internal.bind.v2.model.impl.ClassInfoImpl.createAttributeProperty(ClassInfoImpl.java:904)
         at java.xml.bind@9-ea/com.sun.xml.internal.bind.v2.model.impl.ClassInfoImpl.addProperty(ClassInfoImpl.java:861)
         at java.xml.bind@9-ea/com.sun.xml.internal.bind.v2.model.impl.ClassInfoImpl.findFieldProperties(ClassInfoImpl.java:393)
         at java.xml.bind@9-ea/com.sun.xml.internal.bind.v2.model.impl.ClassInfoImpl.getProperties(ClassInfoImpl.java:296)
         at java.xml.bind@9-ea/com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:246)
         at java.xml.bind@9-ea/com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:212)
         at java.xml.bind@9-ea/com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:360)
         at java.xml.bind@9-ea/com.sun.xml.internal.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:375)
         at jdk.xml.bind@9-ea/com.sun.tools.internal.jxc.api.impl.j2s.JavaCompilerImpl.bind(JavaCompilerImpl.java:80)
         at jdk.xml.bind@9-ea/com.sun.tools.internal.jxc.ap.SchemaGenerator.process(SchemaGenerator.java:95)
         at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:959)
         at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:875)
         at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.access$2100(JavacProcessingEnvironment.java:106)
         at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1182)
         at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1290)
         at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1261)
         at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:939)
         at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl$1.call(JavacTaskImpl.java:104)
         at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl$1.call(JavacTaskImpl.java:100)
         at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.handleExceptions(JavacTaskImpl.java:135)
         ... 10 more