Defunct Process in Linux

Question

I´m using a Java Stored Procedure to execute a shell in Linux.
Prcedure that calls the java source
PROCEDURE p_wcsmsg (cmd1  IN  VARCHAR2)
AS LANGUAGE JAVA
NAME 'Wcsmsg.execute (java.lang.String)';
Java Source
create or replace and compile java source named wcsmsg as
import java.lang.*;
import java.io.*;
public class Wcsmsg
+{+
public static void execute (String cmd1) throws IOException
+{+
String[] CommandWcsmsg = {"/bin/bash", "-c", cmd1};
Runtime.getRuntime().exec(CommandWcsmsg);
+}+
+}+
Shell:
JAVA_ROOT=/usr/lib/SunJava2-1.4.2/jre
+JCMD="${JAVA_ROOT}/bin/java"+
+$JCMD -cp /bin/wcsmsg/ Wcsmsg+
When that shell is executed, is created a zombie process:
++oracle 16179 0.4 0.0 0 0 ? Z 17:07 0:00 [bash] <defunct>++
That process can´t killed because is a zombie process.
How can I prevent this process becomes a zombie prcess?

Answer 1

When it is modified for this script is displayed the following error
Code
create or replace and compile java source named wcsmsg as
import java.lang.*;
import java.io.*;
public class Wcsmsg
+{+
public static void execute (String cmd1) throws IOException
+{+
String[] CommandWcsmsg = {"/bin/bash", "-c", cmd1};
+try {+
Process process = Runtime.getRuntime().exec(CommandWcsmsg);
process.waitFor();
+}+
+catch(IOException e){+
e.printStackTrace();
+}+
+}+
+}+
Error:
Compilation errors for JAVA SOURCE ANTREF.WCSMSG
Error: Exception java.lang.InterruptedException must be caught, or it must be declared in the throws clause of this method.
Line: 12
Text: process.waitFor();