在Eclipse Indigo中使用ANT时出现javah NullPointerException [英] javah NullPointerException while using ANT in Eclipse Indigo
问题描述
我正在使用ANT buildscript,如下所示:
I'm using an ANT buildscript like so:
<project basedir="..">
<property name="src" location="src"/>
<property name="classes" location="classes" />
<property name="jnifiles" location="jnifiles" />
<target name="init">
<mkdir dir="${classes}" />
<mkdir dir="${jnifiles}" />
</target>
<target name="compile"
description="compile the source " >
<javac srcdir="${src}" destdir="${classes}" includeantruntime="false" />
</target>
<target name="generate-jni">
<javah destdir="${jnifiles}" >
<class name="com.example.ExecJNI" />
</javah>
</target>
<target name="clean"
description="clean up" >
<delete dir="${classes}"/>
<delete dir="${jnifiles}"/>
</target>
它经过清理,初始化和编译就很好了,但是在generate-jni时出现以下错误:
It goes through clean, init and compile just fine, but at generate-jni I get the following error:
generate-jni:
[javah] Exception in thread "main" java.lang.NullPointerException
[javah] at com.sun.tools.javah.JavahTask.run(JavahTask.java:509)
[javah] at com.sun.tools.javah.JavahTask.run(JavahTask.java:335)
[javah] at com.sun.tools.javah.Main.main(Main.java:46)
有人知道我在做什么错吗?
Anyone have a clue what I'm doing wrong?
推荐答案
您是否检查了已安装JRE的默认版本?
Did you check the default version of installed JREs?
我也遇到了同样的问题,并且在Eclipse首选项中检查了已安装的JRE. 尽管我确实安装了jdk1.7,但默认版本是jre7. 将默认版本更改为jdk1.7后,此问题已解决.
I had the same problem too and I checked installed JREs in Eclipse preferences. The default version is jre7 though I indeed installed jdk1.7. After changing the default version to jdk1.7, the problem is solved.
希望此信息对您有所帮助.
Hope this information helps you.
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