用installanywhere打包过程中执行文件出现权限问题

我用installanywhere 打linux 下的包，我把可执行文件权限设成777，为什么在安装时还是有权限问题？
请高手指点下!
java.io.IOException: Cannot run program "/home/java/downcert": java.io.IOExcepti                                                                             on: error=13, Permission denied
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:475)
        at java.lang.Runtime.exec(Runtime.java:610)
        at java.lang.Runtime.exec(Runtime.java:448)
        at java.lang.Runtime.exec(Runtime.java:345)
        at ExecuteTargetFile.install(ExecuteTargetFile.java:35)
        at com.zerog.ia.installer.actions.CustomAction.installSelf(DashoA10*..)
        at com.zerog.ia.installer.InstallablePiece.install(DashoA10*..)
        at com.zerog.ia.installer.InstallablePiece.install(DashoA10*..)
        at com.zerog.ia.installer.GhostDirectory.install(DashoA10*..)
        at com.zerog.ia.installer.InstallablePiece.install(DashoA10*..)
        at com.zerog.ia.installer.Installer.install(DashoA10*..)
        at com.zerog.ia.installer.LifeCycleManager.a(DashoA10*..)
        at com.zerog.ia.installer.LifeCycleManager.a(DashoA10*..)
        at com.zerog.ia.installer.Main.main(DashoA10*..)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.                                                                             java:57)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAcces                                                                             sorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:616)
        at com.zerog.lax.LAX.launch(DashoA10*..)
        at com.zerog.lax.LAX.main(DashoA10*..)
Caused by: java.io.IOException: java.io.IOException: error=13, Permission denied
        at java.lang.UNIXProcess.<init>(UNIXProcess.java:164)
        at java.lang.ProcessImpl.start(ProcessImpl.java:81)
        at java.lang.ProcessBuilder.start(ProcessBuilder.java:468)