Question

我正在尝试运行你好世界。我收到错误“无法加载Main-Class清单属性”

我遇到了错误，它的属性名称=“MainClass”，当我用Main-Class替换它时它运行正常。

属性名称是用户定义的，对吧？那我为什么会收到这个错误？

这是我的代码： -

    <target name="run" depends="clean,build,jar">
        <java jar="${jar.dir}/${ant.project.name}.jar" fork="true" />
    </target>
    <target name="clean">
        <delete dir="${build.dir}" />
    </target>
    <target name="build">
        <mkdir dir="${classes.dir}" />
        <javac srcdir="${src.dir}" destdir="${classes.dir}" />
    </target>
    <target name="jar">
        <mkdir dir="${jar.dir}" />
        <jar destfile="${jar.dir}/${ant.project.name}.jar" basedir="${classes.dir}" >
            <manifest>
                <attribute name="MainClass" value="${main-class}" />
            </manifest>
        </jar>
    </target>
</project>

这是错误部分的输出： -

sushil@sushil:~/java/hello_world$ ant
Buildfile: /home/sushil/java/hello_world/build.xml

clean:
   [delete] Deleting directory /home/sushil/java/hello_world/build

build:
    [mkdir] Created dir: /home/sushil/java/hello_world/build/classes
    [javac] /home/sushil/java/hello_world/build.xml:39: warning: 'includeantruntime' was not set, defaulting to build.sysclasspath=last; set to false for repeatable builds
    [javac] Compiling 1 source file to /home/sushil/java/hello_world/build/classes

jar:
    [mkdir] Created dir: /home/sushil/java/hello_world/build/jar
      [jar] Building jar: /home/sushil/java/hello_world/build/jar/hello_world.jar

run:
     [java] Failed to load Main-Class manifest attribute from
     [java] /home/sushil/java/hello_world/build/jar/hello_world.jar
     [java] Java Result: 1

BUILD SUCCESSFUL
Total time: 1 second

感谢。

Answer 1

Main-Class 是一个特殊属性，用作入口点。有关详细信息，请参阅manifest documentation。

是否预定义了ant属性名称参数？

1 个答案: