小编jsk*_*ady的帖子

好的,我有一个类createUser,它应该创建一个XML文件来存储用户的数据.问题是,当我运行它时,我收到此错误

>        ERROR:  ''
>     javax.xml.transform.TransformerException: java.lang.NullPointerException
>         at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(Unknown
> Source)
>         at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transform(Unknown
> Source)
>         at CreateUser.makeUser(CreateUser.java:156)
>         at Welcomeclass.welcome(Welcomeclass.java:48)
>         at Welcomeclass.main(Welcomeclass.java:32)
>     Caused by: java.lang.NullPointerException
>         at com.sun.org.apache.xml.internal.serializer.ToUnknownStream.characters(Unknown
> Source)
>         at com.sun.org.apache.xalan.internal.xsltc.trax.DOM2TO.parse(Unknown
> Source)
>         at com.sun.org.apache.xalan.internal.xsltc.trax.DOM2TO.parse(Unknown
> Source)
>         at com.sun.org.apache.xalan.internal.xsltc.trax.DOM2TO.parse(Unknown
> Source)
>         at com.sun.org.apache.xalan.internal.xsltc.trax.DOM2TO.parse(Unknown
> Source)
>         at com.sun.org.apache.xalan.internal.xsltc.trax.DOM2TO.parse(Unknown
> Source)
>         at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerImpl.transformIdentity(Unknown
> Source)
>         ... 5 more
>     ---------
>     java.lang.NullPointerException
>         at com.sun.org.apache.xml.internal.serializer.ToUnknownStream.characters(Unknown
> Source)
>         at …

Run Code Online (Sandbox Code Playgroud)