如何在使用 Ant 构建 jar 文件时设置类路径顺序? [英] How to set classpath order while building jar file using Ant?

问题描述

我正在使用 zipgroupfileset 将 lib 文件夹中的所有 jar 捆绑到我的可执行应用程序 jar 文件中.

I am using zipgroupfileset to bundle all jars from lib folder to include in my executable application jar file.

<zipgroupfileset dir="${lib.dir}" />

必须以某种默认顺序包含罐子.我想更改此默认顺序.

Jars must be getting included in some default order. I want to alter this default order.

关于我为什么要这样做的说明:我的 Java 桌面应用程序使用了许多包含在类路径中的第三方 jar.当我通过 Eclipse 运行我的代码时，它工作正常.但是当我使用 ANT 构建 jar 文件时，它无法按预期工作.我确定它与类路径中的 jar 序列有关，就像我在 Eclipse 中更改 jar 顺序一样，它也会在那里失败.

A note on why I want this: my Java desktop application uses many third party jars which are included in class path. When I run my code through Eclipse it works fine. But when I build the jar file using ANT it doesn't work as expected. I am sure it is related to jar sequence in classpath as if I change jar order in Eclipse it fails there as well.

注意:我使用的是 Eclipse Kepler、Java 7、Ant 1.8.

Note: I am using Eclipse Kepler, Java 7, Ant 1.8.

推荐答案

我终于找到了解决方案.我在更改我的 ANT 文件后构建了 Jar.现在，我的 ANT 构建在类路径中明确包含了 3rd 方 API，这是解决方案的关键.

Finally I got the solution. I build the Jar after altering my ANT file. Now my ANT build includes 3rd party APIs explicitly in classpath and that was the key to the solution.

<property name="lib.dir" value="lib" />

<manifestclasspath property="jar.classpath" jarfile="${lib.dir}/*.jar">
    <classpath refid="project.class.path"/>
</manifestclasspath>

<jar destfile="${jar.dir}/${jar.name}">
        <fileset dir="${class.root}" includes="**/*.*" />
        <manifest>
                <attribute name="Main-Class" value="${Main-Class}" />
                <attribute name="Class-Path" value="${jar.classpath}" />
        </manifest>
</jar>

以前我在 ANT 中有类路径条目，如下所示:

Previously I had class-path entry in ANT as follows:

<attribute name="Class-Path" value="." />

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