我正在构建hadoop开发环境 ant compile 在hadoop-0.20.2上，我成功地构建了它 ant clean package-Djava5.home=/usr/lib/jvm/jdk1.5.0_22/bin/java -Dforrest.home=~/Documents/forrest-0.8 我得到以下错误。请帮助我解决这个错误。为了获得更多信息，我使用了以下步骤：构建hadoop开发环境
. 生成失败

/home/dere/Documents/hadoop-0.20.2/build.xml:867: Execute failed: java.io.IOException: Cannot run program "~/Documents/apache-forrest-0.8/bin/forrest" (in directory "/home/dere/Documents/hadoop-0.20.2/src/docs"): error=2, No such file or directory
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1041)
    at java.lang.Runtime.exec(Runtime.java:617)
    at org.apache.tools.ant.taskdefs.launcher.Java13CommandLauncher.exec(Java13CommandLauncher.java:41)
    at org.apache.tools.ant.taskdefs.Execute.launch(Execute.java:428)
    at org.apache.tools.ant.taskdefs.Execute.execute(Execute.java:442)
    at org.apache.tools.ant.taskdefs.ExecTask.runExecute(ExecTask.java:628)
    at org.apache.tools.ant.taskdefs.ExecTask.runExec(ExecTask.java:669)
    at org.apache.tools.ant.taskdefs.ExecTask.execute(ExecTask.java:495)
    at org.apache.tools.ant.UnknownElement.execute(UnknownElement.java:292)
    at sun.reflect.GeneratedMethodAccessor4.invoke(Unknown Source)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.apache.tools.ant.dispatch.DispatchUtils.execute(DispatchUtils.java:106)
    at org.apache.tools.ant.Task.perform(Task.java:348)
    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: java.io.IOException: error=2, No such file or directory
    at java.lang.UNIXProcess.forkAndExec(Native Method)
    at java.lang.UNIXProcess.<init>(UNIXProcess.java:135)
    at java.lang.ProcessImpl.start(ProcessImpl.java:130)
    at java.lang.ProcessBuilder.start(ProcessBuilder.java:1022)