java - 方法不会覆盖或实现父类(super class)型的方法

Question

我试图重写“NamespacePrefixMapper”类的抽象方法来为 xml 属性提供自定义 namespace 。但它一直给出以下错误消息。

.c.compile:
   [javac] Compiling 1 source file to C:\isp_development\target\dmc_ac_efulfilment\release\lib
   [javac] C:\isp_development\source\dmc_ac_efulfilment\javasource\de\dmc\enfinity\adapter\efulfilment\client\JustForTest.java:3: error: package com.sun.xml.internal.bind.marshaller does not exist
   [javac] import com.sun.xml.internal.bind.marshaller.NamespacePrefixMapper;
   [javac]                                            ^
   [javac] C:\isp_development\source\dmc_ac_efulfilment\javasource\de\dmc\enfinity\adapter\efulfilment\client\JustForTest.java:5: error: cannot find symbol
   [javac] public class JustForTest extends NamespacePrefixMapper {
   [javac]                                  ^
   [javac]   symbol: class NamespacePrefixMapper
   [javac] C:\isp_development\source\dmc_ac_efulfilment\javasource\de\dmc\enfinity\adapter\efulfilment\client\JustForTest.java:7: error: method does not override or implement a method from a supertype
   [javac]     @Override
   [javac]     ^
   [javac] 3 errors

下面是我试图覆盖的方法代码。

 @Override
    public String getPreferredPrefix(String namespaceUri, String suggestion, boolean requirePrefix) {
    namespaceUri = "http://base.google.com/ns/1.0";
    suggestion="g";
    requirePrefix=true;
    return suggestion;
    }

是什么云的原因。非常感谢您的帮助。

Answer 1

package com.sun.xml.internal.bind.marshaller 不存在 应该是您的 key 。检查您的类路径。