Executing an hp unix command by using java code

i'm trying to execut the "chmod" command on my jsp as follows :
String cmd = "chmod 644 "+fileName;
Process process;
process=Runtime.getRuntime().exec(cmd);
but i got the following exception:
java.io.IOException: chmod: not found
     at java.lang.UNIXProcess.forkAndExec(Native Method)
     at java.lang.UNIXProcess.<init>(UNIXProcess.java:86)
     at java.lang.Runtime.execInternal(Native Method)
     at java.lang.Runtime.exec(Unknown Source)
     at java.lang.Runtime.exec(Unknown Source)
     at java.lang.Runtime.addShutdownHook(Unknown Source)
     at java.lang.Runtime.addShutdownHook(Unknown Source)
     at receiveJobAppInput.jspService(_receiveJobAppInput.java:358)
     at com.orionserver.http.OrionHttpJspPage.service(OrionHttpJspPage.java, Compiled Code)
     at oracle.jsp.runtimev2.JspPageTable.compileAndServe(JspPageTable.java, Compiled Code)
     at oracle.jsp.runtimev2.JspPageTable.service(JspPageTable.java, Compiled Code)
     at oracle.jsp.runtimev2.JspServlet.internalService(JspServlet.java, Compiled Code)
     at oracle.jsp.runtimev2.JspServlet.service(JspServlet.java, Compiled Code)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java, Compiled Code)
     at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java, Compiled Code)
     at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java, Compiled Code)
     at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java, Compiled Code)
     at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java, Compiled Code)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java, Compiled Code)
     at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java, Compiled Code)
     at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java, Compiled Code)
     at EDU.oswego.cs.dl.util.concurrent.PooledExecutor$Worker.run(PooledExecutor.java, Compiled Code)
     at java.lang.Thread.run(Unknown Source)
can anyone give me a hint why this happend?

What about exec'ing this?
String [] {"chmod" ,"644" , "fileName" }

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