我想使用新的JPA 2.1功能來創建自定義泛型Enum轉換器。但部署我得到這個錯誤:Caused by: org.hibernate.AssertionFailure: Could not extract ParameterizedType representation of AttributeConverter definition from AttributeConverter implementation class [de.lukaseichler.pomodoro.task.entity.converter.PriorityConverter]
無法提取AttributeConverter定義的ParameterizedType表示形式
我在Wildfly 8.0.0.Beta1上使用Hibernate 4.3.0與JPA 2.1。 我在做些什麼或者這是在休眠的錯誤?
Enumconverter.java
public abstract class EnumConverter<T extends Enum> implements AttributeConverter<T, String> {
private Class<T> type;
@Override
public String convertToDatabaseColumn(T attribute) {
return attribute.name();
}
@Override
public T convertToEntityAttribute(String name) {
if (type == null) {
getType();
}
return (T)Enum.valueOf(type, name);
}
private void getType() {
Class<?> converterClass = getClass();
while (true) {
Class<?> baseClass = converterClass.getSuperclass();
assert baseClass != null : "Converter must be derived from " + EnumConverter.class.getName();
if (baseClass == EnumConverter.class) {
break;
}
converterClass = baseClass;
}
Type genericSuperClass = converterClass.getGenericSuperclass();
assert genericSuperClass instanceof ParameterizedType : EnumConverter.class.getName() + "must be generic";
Type[] typeParms = ((ParameterizedType) genericSuperClass).getActualTypeArguments();
assert typeParms.length == 2 : EnumConverter.class.getName() + " must have 2 type parameters but has " + typeParms.length;
Type enumType = typeParms[1];
if(enumType instanceof ParameterizedType) {
enumType = ((ParameterizedType) enumType).getRawType();
}
assert enumType instanceof Enum<?> : "Entity must be a enum type";
type = (Class<T>) enumType;
}
}
PriorityConverter.java
@Converter(autoApply = true)
public class PriorityConverter extends EnumConverter<Priority>{
}
Priority.java
public enum Priority {
NONE, LOW, NORMAL, HIGH, TOP;
}
能否請您發表您的項目配置,包括Hibernate和JPA API的版本? – chrylis
我在Wildfly 8.0.0.Beta1上使用Hibernate 4.3.0和JPA 2.1 –
[相關代碼在這裏](https://github.com/hibernate/hibernate-orm/blob/master/hibernate-core/src /main/java/org/hibernate/cfg/AttributeConverterDefinition.java)。休眠4.3.0仍然是測試版;請確認您使用的是最新版本(我認爲現在是beta5)。 – chrylis