问题
I'm working on a simple build script that should get some constants from a java class file and use them as the version numbers in my file names. I use Eclipse and its own Ant, but put bcel-5.2.jar in my libs folder and into the classpath for the Ant call.
<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>
But unfortunatly the ant task loadproperties fails:
build.xml:46: expected a java resource as source
After that I tried to run Ant from outside Eclipse, using this command line:
set ANT_HOME=C:\Program Files\Java\ant\apache-ant-1.7.1
"%ANT_HOME%\bin\ant.bat"
The result is
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
I'm really lost now. Is it a bcel error? Is it an Ant incompatibility with my own bcel?
One last hint: Removing the bcel classpath entry from the Ant target results in this:
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)
UPDATE After setting the Ant preferences in Eclipse, the error message changed:
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)
Now I think it's maybe a version conflict between Ant and BCEL. Or BCEL and JDK1.6. Or Eclipse and BCEL and Ant or JDK... I'm lost.
ANSWER:
This is the comment found below
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
回答1:
Crap, I knew it! It comes down to file encoding issues. The files are still in ISO-8819-1, but I'm using UTF-8. The project is pretty aged and was created with the wrong encoding in place. Setting the parameter encoding in the javac and loadproperties Task fixes it.
<target name="generate_version" depends="compile">
<loadproperties encoding="iso-8859-1" srcfile="${dir.dest}/MyVersion.class">
<filterchain>
<classconstants/>
</filterchain>
</loadproperties>
</target>
I thought it got changed by our Subversion server, but I think I have to convert every single file to UTF-8 myself now... think that is another question for SO.
回答2:
The documentation for loadproperties says that the nested classpath element is for use with the resource attribute - an alternative to using srcfile.
Add the BCEL jar to your global classpath. In Eclipse, add it as a global entry to your classpath in the runtime preferences. On the command line, use the -lib switch.
(source: eclipse.org)
回答3:
Looks like a classpath error. Run "ant -v" to give you some more detail on errors.
来源:https://stackoverflow.com/questions/876840/ant-loadproperties-failed-bcel-error