java - Ant loadproperties 失败(bcel 错误？)

Question

我正在编写一个简单的构建脚本，它应该从 java 类文件中获取一些常量并将它们用作我的文件名中的版本号。我使用 Eclipse 和它自己的 Ant，但将 bcel-5.2.jar 放在我的 libs 文件夹中并放入 Ant 调用的类路径中。

<target name="generate_version" depends="compile">
    <loadproperties srcfile="${dir.dest}/MyVersion.class">
        <classpath>
            <fileset dir="${dir.libs}">
                <include name="**/bcel*.jar"/>
            </fileset>
        </classpath>

        <filterchain>
            <classconstants/>
        </filterchain>
    </loadproperties>
</target>

但不幸的是，ant 任务 loadproperties 失败了:

build.xml:46: expected a java resource as source

之后，我尝试使用以下命令行从 Eclipse 外部运行 Ant:

set ANT_HOME=C:\Program Files\Java\ant\apache-ant-1.7.1
"%ANT_HOME%\bin\ant.bat"

结果是

Buildfile: build.xml

init:
     [echo] Building project.
     [echo] ant.home:          C:\Program Files\Java\ant\apache-ant-1.7.1
     [echo] ant.java.version:  1.6
     [echo] ant.version:       Apache Ant version 1.7.1 compiled on June 27 2008

compile:
    [javac] Compiling 262 source files to **********\build
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] Note: Some input files use unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.

generate_version:

BUILD FAILED
********************\ant\build.xml:46: expected a java resource as source

我现在真的迷路了。是 bcel 错误吗？是不是 Ant 和我自己的 bcel 不兼容？

最后一个提示:从 Ant 目标中删除 bcel 类路径条目会导致:

Buildfile: build.xml

init:
     [echo] Building project.
     [echo] ant.home:          C:\Program Files\Java\ant\apache-ant-1.7.1
     [echo] ant.java.version:  1.6
     [echo] ant.version:       Apache Ant version 1.7.1 compiled on June 27 2008

compile:
    [javac] Compiling 262 source files to ********************\build
    [javac] Note: Some input files use or override a deprecated API.
    [javac] Note: Recompile with -Xlint:deprecation for details.
    [javac] Note: Some input files use unchecked or unsafe operations.
    [javac] Note: Recompile with -Xlint:unchecked for details.

generate_version:

BUILD FAILED
java.lang.NoClassDefFoundError: org/apache/bcel/classfile/ClassParser
        at org.apache.tools.ant.filters.util.JavaClassHelper.getConstants(JavaClassHelper.java:47)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

更新 在 Eclipse 中设置 Ant 首选项后，错误消息更改为:

BUILD FAILED
*********************\build.xml:46: org.apache.bcel.classfile.ClassFormatException:  is not a Java .class file
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:115)
    at org.apache.tools.ant.Task.perform(Task.java:348)
    at org.apache.tools.ant.Target.execute(Target.java:357)
    at org.apache.tools.ant.Target.performTasks(Target.java:385)
    at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1329)
    at org.apache.tools.ant.Project.executeTarget(Project.java:1298)
    at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
    at org.eclipse.ant.internal.ui.antsupport.EclipseDefaultExecutor.executeTargets(EclipseDefaultExecutor.java:32)
    at org.apache.tools.ant.Project.executeTargets(Project.java:1181)
    at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.run(InternalAntRunner.java:423)
    at org.eclipse.ant.internal.ui.antsupport.InternalAntRunner.main(InternalAntRunner.java:137)

现在我认为这可能是 Ant 和 BCEL 之间的版本冲突。或者BCEL和JDK1.6。或者 Eclipse、BCEL、Ant 或 JDK……我迷路了。

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回答:

这是下面的评论

I should have mentioned this - you do not need to convert anything. Doc: "since Ant 1.7, the character encoding ISO-8859-1 is used to convert from characters back to bytes, so ONE HAS TO USE THIS ENCODING for reading the java class file." This is just a convention to get round the fact that a character filter is being used on raw bytes. ant.apache.org/manual/CoreTypes/… Using UTF-8 would be bad! – McDowell

Answer 1

废话，我就知道!它归结为文件编码问题。这些文件仍在 ISO-8819-1 中，但我使用的是 UTF-8。该项目相当陈旧，并且是使用错误的编码创建的。在 javac 和 loadproperties 任务中设置参数 encoding 修复它。

<target name="generate_version" depends="compile">
    <loadproperties encoding="iso-8859-1" srcfile="${dir.dest}/MyVersion.class">
        <filterchain>
            <classconstants/>
        </filterchain>
    </loadproperties>
</target>

我认为它已被我们的 Subversion 服务器更改，但我认为我现在必须自己将每个文件转换为 UTF-8...认为这是 SO 的另一个问题。