我得到了这个例外:
Field mapping error -->
MapId: null
Type: null
Source parent class: com.ParentObject
Source field name: field1
Source field type: class com.OnOff1BitEnum
Source field value: OFF
Dest parent class: com.SubParent
Dest field name: subParent.field2
Dest field type: java.lang.Boolean java.lang.NullPointerException
at org.dozer.util.ReflectionUtils.invoke(ReflectionUtils.java:270)
at org.dozer.propertydescriptor.GetterSetterPropertyDescriptor.getDeepSrcFieldValue(GetterSetterPropertyDescriptor.java:116)
at org.dozer.propertydescriptor.GetterSetterPropertyDescriptor.getPropertyValue(GetterSetterPropertyDescriptor.java:69)
at org.dozer.fieldmap.FieldMap.getDestValue(FieldMap.java:141)
这是映射字段:
<mapping>
<class-a>com.ParentObject</class-a>
<class-b>com.SubParent</class-b>
<field custom-converter="com.OnOffEnumToBooleanConverter">
<a>field1</a>
<b get-method="isField2">subParent.field2</b>
</field>
</mapping>
我使用的推土机版本是5.4.0
更新: 在此帖子中添加了转换器代码。 当我在这里提出一个断点时,这是没有达到的
public class OnOffEnumToBooleanConverter implements org.dozer.CustomConverter {
/**
* {@inheritDoc}
*/
@Override
public Object convert(Object dest, Object src, Class<?> destClass, Class<?> srcClass) {
if (src == null) {
return null;
}
if (src instanceof com.OnOff1BitEnum) {
boolean canonicalObject;
if ((com.OnOff1BitEnum) src == com.OnOff1BitEnum.ON) {
canonicalObject = true;
} else if ((com.OnOff1BitEnum) src == com.OnOff1BitEnum.OFF) {
canonicalObject = false;
} else { // Unreachable Code To Test
throw new MappingException("Converter " + this.getClass().getCanonicalName() + " used incorrectly. Arguments passed in were: "
+ dest + " and " + src);
}
return canonicalObject;
}
}
答案 0 :(得分:1)
也许是因为你错过了&#34;设置配置&#34;,请尝试明确指定它,看看是否解决了它或发生了不同的错误,例如。
<field custom-converter="com.OnOffEnumToBooleanConverter">
<a>field1</a>
<b get-method="isField2" set-method="field2">subParent.field2</b>
</field>
更新:
我必须正确格式化你的java代码才能阅读......这就是你遇到的问题&#34; if和else&#34;对于布尔值...没有第三个条件......只需仔细查看它:
if (src instanceof com.OnOff1BitEnum)
{
boolean canonicalObject;
if ((com.OnOff1BitEnum) src == com.OnOff1BitEnum.ON)
{
canonicalObject = true;
}
else
{
if ((com.OnOff1BitEnum) src == com.OnOff1BitEnum.OFF)
{
canonicalObject = false;
}
else
{ // Unreachable Code To Test
throw new MappingException("Converter " + this.getClass().getCanonicalName()
+ " used incorrectly. Arguments passed in were: " + dest + " and " + src);
}
}
return canonicalObject;
}
那是&#34;的邪恶,如果不构造&#34;在原始代码中没有括号。
你的&#34;转换&#34;方法返回Object ...所以你的&#34; boolean canonicalObject
&#34;必须是&#34; 布尔 canonicalObject&#34;不是原始类型。
应该是:
@Override
public Object convert(Object dest, Object src, Class<?> destClass, Class<?> srcClass)
{
if (src instanceof com.OnOff1BitEnum)
{
if ((com.OnOff1BitEnum) src == com.OnOff1BitEnum.ON)
{
return Boolean.TRUE;
}
else
{
return Boolean.FALSE;
}
}
return null;
}