Runtime.getRuntime().exec("") on As400

[kamesh aru]

while i am executing
ws_ant coomand at qshell its displaying fallowing message
Buildfile: build.xml does not exist!
Build failed
------------------------------------
theProcess = Runtime.getRuntime().exec("ws_ant");
its giving error
Error on exec() method
java.io.IOException: ws_ant: not found
at java.lang.Throwable.<init>(Throwable.java:195)
at java.lang.Exception.<init>(Exception.java:41)
at java.io.IOException.<init>(IOException.java:40)
at com.ibm.as400.system.OS400Process.<init>(OS400Process.java:88)
at java.lang.Runtime.exec(Runtime.java:566)
at java.lang.Runtime.exec(Runtime.java:428)
at java.lang.Runtime.exec(Runtime.java:364)
at java.lang.Runtime.exec(Runtime.java:326)
at CallHelloPgm.main(CallHelloPgm.java:19)
java.lang.NullPointerException
at CallHelloPgm.main(CallHelloPgm.java:31)

can any one help out with the probelm
thanks in advance

[Rick O'Shay]

My guess is it cannot find the script or qsh is not installed.

[kamesh aru]

qsh is installed and ws_ant is present in the folder

Runtime.getRuntime().exec("java hello");
hello being another java class its executing perfectly from same qsh