我正在使用Tomcat 7,Jaxb2和Jersey1.11。 我有一个EnumProperty类,它继承自一个抽象类Property。
@XmlAccessorType(XmlAccessType.FIELD)
public class EnumProperty extends Property<Enum> {
@XmlElement(name = "property_value", nillable = true)
private Enum value;
public EnumProperty() {
setValueType(PropertyValueTypeEnum.ENUM);
}
@Override
public Enum getValue() {
return value;
}
@Override
public void setValue(Enum value) {
this.value = value;
}
}
Property类还有其他子类。另外,我有另一个类Entity,它拥有一组属性。我还有一个资源,它在其子资源之一中返回一个Collection。当我尝试生成我的应用程序wadl时,我收到NullPointerException。我将问题隔离到了EnumProperty类。谁能帮助我了解问题所在?
java.lang.NullPointerException
java.util.EnumMap.<init>(Unknown Source)
com.sun.xml.bind.v2.model.impl.RuntimeEnumLeafInfoImpl.<init>(RuntimeEnumLeafInfoImpl.java:87)
com.sun.xml.bind.v2.model.impl.RuntimeModelBuilder.createEnumLeafInfo(RuntimeModelBuilder.java:109)
com.sun.xml.bind.v2.model.impl.RuntimeModelBuilder.createEnumLeafInfo(RuntimeModelBuilder.java:85)
com.sun.xml.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:228)
com.sun.xml.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:104)
com.sun.xml.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:85)
com.sun.xml.bind.v2.model.impl.ModelBuilder.getClassInfo(ModelBuilder.java:213)
com.sun.xml.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:99)
com.sun.xml.bind.v2.model.impl.RuntimeModelBuilder.getClassInfo(RuntimeModelBuilder.java:85)
com.sun.xml.bind.v2.model.impl.ModelBuilder.getTypeInfo(ModelBuilder.java:319)
com.sun.xml.bind.v2.model.impl.TypeRefImpl.calcRef(TypeRefImpl.java:96)
com.sun.xml.bind.v2.model.impl.TypeRefImpl.getTarget(TypeRefImpl.java:73)
com.sun.xml.bind.v2.model.impl.RuntimeTypeRefImpl.getTarget(RuntimeTypeRefImpl.java:62)
com.sun.xml.bind.v2.model.impl.RuntimeTypeRefImpl.getTarget(RuntimeTypeRefImpl.java:55)
com.sun.xml.bind.v2.model.impl.ElementPropertyInfoImpl$1.get(ElementPropertyInfoImpl.java:78)
com.sun.xml.bind.v2.model.impl.ElementPropertyInfoImpl$1.get(ElementPropertyInfoImpl.java:81)
java.util.AbstractList$Itr.next(Unknown Source)...