Ant（使用 ant-contrib）构建 - 路径/依赖问题 - 未找到参考

Question

我正在尝试创建一个系统，我可以在其中使用通用 build.xml 作为我们绝大多数构建的模板。我非常接近。基本上，应用程序级 build.xml 文件只需要定义一些东西（目标 jar、依赖项（作为列表）和一些其他状态项），然后导入模板 build.xml。

我遇到的问题是我正在尝试获取依赖项并以编程方式构建类路径。我很接近，我想。但是，一旦在编译步骤中引用了类路径，它就会尝试解析似乎在编译步骤发生之前已正确准备的引用。而且，它会导致 BUILD FAILED : Reference cpDependency4 not found。

注意：COTS 的东西存储在同一个目录中，因此使这部分工作变得微不足道。项目依赖可能都来自不同的子目录，也需要拉入子依赖项/目录。

以下是应用程序 build.xml 中准备的项目示例：

<property name="PROJECT_DEPENDENCIES" value="/path/to/other/dependency1,/path/to/other/dependency2,/path/to/other/dependency3,/path/to/other/dependency4" />
<property name="COTS_DEPENDENCIES" value="commons-io-*.jar,log4j-*.jar,spring-aop-*.RELEASE.jar,spring-beans-*.RELEASE.jar,spring-context-*.RELEASE.jar,spring-core-*.RELEASE.jar,spring-jms-*.RELEASE.jar,spring-oxm-*.RELEASE.jar,spring-web-*.RELEASE.jar"/>
<!-- ... -->
<import file="${DEVELOPMENT_BASE_DIR}/common/ant/antTemplate.xml" />  

然后antTemplate文件包含：

<path id="cpDependency0" />
<var name="trackDependencyPath" value="cpDependency0" />
<var name="index" value="0"/>        
<for list="${PROJECT_DEPENDENCIES}" param="dependency">
  <sequential>
    <var name="prior" value="${index}"/>
    <math result="index" operand1="${index}" operation="+" operand2="1" datatype="int" />        
    <property name="var${index}" value="@{dependency}" />
    <path id="cpDependency${index}">          
      <path refid="cpDependency${prior}"/>
      <fileset dir="@{dependency}/jar/${env}" includes="*.jar" />
      <fileset dir="@{dependency}/jar/${env}/dependencies" includes="*.jar" />
    </path>
    <var name="trackDependencyPath" value="cpDependency${index}" />
  </sequential>      
</for>

<path id="classpath.compile">    
  <fileset dir="${COTS_DIR}/main" includes="${COTS_DEPENDENCIES}" />            
  <path refid="${trackDependencyPath}" />
</path>

这似乎设置正确，但是......稍后，当它到达编译目标时：

<target name="compile" depends="init">
  <echo message="Compiling ${ant.project.name}..." />
  <javac source="1.7" target="1.7" debug="${debug}" srcdir="${SOURCE_JAVA_MAIN_DIR}" destdir="${BUILD_JAVA_MAIN_DIR}" classpathref="classpath.compile" />
  <jar destfile="${PACKAGE_DIR}/${TARGET_JAR}" basedir="${BUILD_JAVA_MAIN_DIR}" excludes="*.jar" />
  <copy todir="${PACKAGE_DIR}">
    <path refid="classpath.compile" />
  </copy>
</target>

我收到以下错误（在 javac 行）：

BUILD FAILED
/path/to/common/ant/antTemplate.xml:188: Reference cpDependency4 not found.

Answer 1

你的问题是：

<path id="classpath.compile">    
  <fileset dir="${COTS_DIR}/main" includes="${COTS_DEPENDENCIES}" />            
  <path refid="${trackDependencyPath}" />
</path>

指的不是 refid，而是一个属性（或 antcontrib 变量），在这种情况下
具有相同的值 => 'cpDependency4'

-- 评论后编辑--

即使使用字符串 'cpDependency4' 也无济于事，因为路径 ID 在 for 循环中从未正确设置，正如一些测试所揭示的那样：

<for list="${PROJECT_DEPENDENCIES}" param="dependency">
  <sequential>
    ...
    <var name="trackDependencyPath" value="cpDependency${index}" />
    <!-- put pathconvert here -->
  </sequential>      
</for>

试试看：

<pathconvert property="foo"><path refid="cpDependency4"/></pathconvert>

或

<pathconvert property="foo"><path refid="cpDependency${index}"/></pathconvert>

你会得到：

Reference cpDependency4 not found.

在这两种情况下。提高噪声级进行调试，您会看到：

Adding reference: cpDependency0
Setting ro project property: trackDependencyPath -> cpDependency0
Setting ro project property: index -> 0
Setting ro project property: prior -> 0
Setting ro project property: index -> 1
Setting project property: var1 -> /path/to/other/dependency1
Adding reference: cpDependency${index}
Property "env" has not been set
Property "env" has not been set
Setting ro project property: trackDependencyPath -> cpDependency1
Setting ro project property: prior -> 1
Setting ro project property: index -> 2
Setting project property: var2 -> /path/to/other/dependency2
Overriding previous definition of reference to cpDependency${index}
Adding reference: cpDependency${index}
Property "env" has not been set
Property "env" has not been set
Setting ro project property: trackDependencyPath -> cpDependency2
Setting ro project property: prior -> 2
Setting ro project property: index -> 3
Setting project property: var3 -> /path/to/other/dependency3
Overriding previous definition of reference to cpDependency${index}
Adding reference: cpDependency${index}
Property "env" has not been set
Property "env" has not been set
Setting ro project property: trackDependencyPath -> cpDependency3
Setting ro project property: prior -> 3
Setting ro project property: index -> 4
Setting project property: var4 -> /path/to/other/dependency4
Overriding previous definition of reference to cpDependency${index}
Adding reference: cpDependency${index}