Use exec to run java

This way the PID returned to the parent process will be the PID of the JVM,
not of the shell running the script

Author: lukebakken

scripts/runjava

@@ -92,4 +92,4 @@ if $cygwin; then
 	CLASSPATH=`cygpath --path --mixed "$CLASSPATH"`
 fi
 
-"${JAVA_HOME}/bin/java" ${JAVA_OPTS} -cp "$CLASSPATH" "$@"
+exec "${JAVA_HOME}/bin/java" ${JAVA_OPTS} -cp "$CLASSPATH" "$@"