execute shell command from groovy script

Question

import com.hp.opr.api.scripting.Event;
import com.hp.opr.api.scripting.Priority;
import com.hp.opr.api.scripting.Severity;
import com.hp.opr.api.ws.model.event.ci.OprNode;
import com.hp.ucmdb.api.*
import com.hp.ucmdb.api.topology.*
import java.util.List;


class SimpleExample
{
                def init()
                {
                                // Nothing to initialize
                }

                def destroy()
                {
                                // Nothing to destroy
                }

                def process(List<Event> events)
                {
                                events.each {
                                                event -> modifyEvent(event); 
                                }
                }

                def modifyEvent(Event event)
                {

                                String title = event.getTitle()
                                String sev = event.getSeverity()
                                event.setDescription(title+sev)

                                String command = "sh /opt/HP/BSM/bin/snmp_trap_test.sh"
                                def proc = command.execute()
                                StringBuffer sout = new StringBuffer(), serr = new StringBuffer()
                                proc.consumeProcessOutput(sout, serr)
                                proc.waitForOrKill(15000)




                }
}

hello everyone, i am totally new to groovy scripting i need to execute a script on Linux using groovy,

i need to run a script located on linux. i found the above code and i tried to use it but it is not working

what is wrong with my code here.