我想从ant中执行rake任务。我的jruby在构建过程中以zip文件的形式提供，我在运行时将其解压缩。我的build.xml如下所示：
<target name="load-rake-task">
<typedef name="rake" classname="org.jruby.ant.Rake" classpath="${jruby.dir}/jruby/lib/jruby.jar" />
</target>
<target name="build" depends="load-rake-task">
<rake task="build" />
</target>
当我运行ant build时，它给出了以下异常：
build:
[rake] LoadError: no such file to load -- ant/tasks/raketasks
[rake] require at org/jruby/RubyKernel.java:1085
[rake] (root) at <script>:1
BUILD FAILED
build.xml:23: Could not create type rake due to org.jruby.embed.EvalFailedException: (LoadError) no such file to load -- ant/tasks/raketasks
at org.jruby.embed.internal.EmbedEvalUnitImpl.run(EmbedEvalUnitImpl.java:133)
at org.jruby.embed.ScriptingContainer.runUnit(ScriptingContainer.java:1264)
at org.jruby.embed.ScriptingContainer.runScriptlet(ScriptingContainer.java:1257)
at org.jruby.ant.RakeTaskBase.acquireRakeReference(RakeTaskBase.java:38)
at org.jruby.ant.RakeTaskBase.<init>(RakeTaskBase.java:17)
at org.jruby.ant.Rake.<init>(Rake.java:6)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.apache.tools.ant.AntTypeDefinition.innerCreateAndSet(AntTypeDefinition.java:328)
at org.apache.tools.ant.AntTypeDefinition.createAndSet(AntTypeDefinition.java:274)
at org.apache.tools.ant.AntTypeDefinition.icreate(AntTypeDefinition.java:219)
at org.apache.tools.ant.AntTypeDefinition.create(AntTypeDefinition.java:206)
at org.apache.tools.ant.ComponentHelper.createComponent(ComponentHelper.java:285)
at org.apache.tools.ant.ComponentHelper.createComponent(ComponentHelper.java:263)
at org.apache.tools.ant.UnknownElement.makeObject(UnknownElement.java:429)
at org.apache.tools.ant.UnknownElement.maybeConfigure(UnknownElement.java:163)
at org.apache.tools.ant.Task.perform(Task.java:347)
at org.apache.tools.ant.Target.execute(Target.java:435)
at org.apache.tools.ant.Target.performTasks(Target.java:456)
at org.apache.tools.ant.Project.executeSortedTargets(Project.java:1393)
at org.apache.tools.ant.Project.executeTarget(Project.java:1364)
at org.apache.tools.ant.helper.DefaultExecutor.executeTargets(DefaultExecutor.java:41)
at org.apache.tools.ant.Project.executeTargets(Project.java:1248)
at org.apache.tools.ant.Main.runBuild(Main.java:851)
at org.apache.tools.ant.Main.startAnt(Main.java:235)
at org.apache.tools.ant.launch.Launcher.run(Launcher.java:280)
at org.apache.tools.ant.launch.Launcher.main(Launcher.java:109)
Caused by: org.jruby.exceptions.RaiseException: (LoadError) no such file to load -- ant/tasks/raketasks
at org.jruby.RubyKernel.require(org/jruby/RubyKernel.java:1085)
at RUBY.(root)(<script>:1)
有没有人知道如何解决它？我在同一目录下build.xml和Rakefile。 $ {jruby.dir}指向提取的jruby目录。