[Ant API求助]XSLTProcess的NullPointerException问题

[CrazyJavar]

自定义的Task类中的execute()方法如下：

XSLTProcess xp = new XSLTProcess();
xp.setProcessor("Spec Transmission");
XSLTProcess.Param param = xp.createParam();
param.setName(VAR_LANGUAGE);
param.setExpression(language);

xp.setIn(srcF);
xp.setStyle(engine.getAbsolutePath());
xp.setOut(dstF);
log(
"Transforming "
+ srcF.getAbsolutePath()
+ " to "
+ dstF.getAbsolutePath()
+ " by "
+ engine.getAbsolutePath());

xp.execute();


所有文件均不为null，为何运行后程序报错为
[TaskName] NullPointerException
呢

请高手指教

谢谢

[goodchen8]

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[dunktalent]

请把错误信息铁出来

[CrazyJavar]

错误信息就是一句

[TaskName] NullPointerException

[CrazyJavar]

困扰啊

[CrazyJavar]

研究了一下，发现不仅仅是XSLTPRocess的问题

我新建一个Task

里面就一个execute方法

其中的代码如下：

Mkdir md = new Mkdir();
md.init();
md.setDir(new File("C:\\124"));
md.execute();

在build.xml写好taskdef后，调用

发现还是抛出

[TaskName] java.lang.NullPointerException

真是奇怪啊

问题究竟出在哪里呢？

[CrazyJavar]

Up

[CrazyJavar]

完整源码如下，请高手帮忙看看
import java.io.*;

import org.apache.tools.ant.*;
import org.apache.tools.ant.taskdefs.*;

public class TestTask extends Task
{
private File srcF;
private File dstF;
private File engine;

/**
* @param file
*/
public void setDstf(File file)
{
dstF = file;
}

/**
* @param file
*/
public void setEngine(File file)
{
engine = file;
}

/**
* @param file
*/
public void setSrcf(File file)
{
srcF = file;
}

public void execute()
{
XSLTProcess xp = new XSLTProcess();
xp.setProcessor("Test Task");
XSLTProcess.Param param = xp.createParam();
param.setName("language");
param.setExpression("_en");

xp.setIn(srcF);
xp.setStyle(engine.getAbsolutePath());
xp.setOut(dstF);

log(
"Transforming "
+ srcF.getAbsolutePath()
+ " to "
+ dstF.getAbsolutePath()
+ " by "
+ engine.getAbsolutePath());

xp.execute();
}
}

build.xml如下：
<?xml version="1.0"?>
<project name="SpecLangSelection" default="xsltprocesstest" basedir=".">
<property name="classes.dir" value="classes"/>
<property name="lib.dir" value="lib"/>
<taskdef name="TestTask" classname="TestTask" classpath="${classes.dir}"/>
</target>

<target name="xsltprocesstest">
<TestTask srcf="xx.xml" dstf="yy.xml" engine="engine.xslt"/>
</target>
</project>