Problem in loading servlet in startup

[Em Aiy]

Hi, i have a servlet and i have mapped in XML to load it at server startup. but it is throwing an exception. can you people please help me out.

the exception is

 
at org.apache.jasper.util.SystemLogHandler.findStream(SystemLogHandler.java:105)
        at org.apache.jasper.util.SystemLogHandler.println(SystemLogHandler.java:214)
        at org.apache.jasper.util.SystemLogHandler.println(SystemLogHandler.java:214)
        at org.apache.jasper.util.SystemLogHandler.println(SystemLogHandler.java:214)
        at advertBeans.AdvertStart.init(AdvertStart.java:9)
        at javax.servlet.GenericServlet.init(GenericServlet.java:211)
        at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1105)
        at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:932)
        at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:3917)
        at org.apache.catalina.core.StandardContext.start(StandardContext.java:4197)
        at org.apache.catalina.core.StandardContext.reload(StandardContext.java:2990)
        at org.apache.catalina.manager.ManagerServlet.reload(ManagerServlet.java:906)
        at org.apache.catalina.manager.ManagerServlet.doGet(ManagerServlet.java:353)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.netbeans.modules.web.monitor.server.MonitorFilter.doFilter(MonitorFilter.java:168)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
        at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
        at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
        at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:524)
        at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
        at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
        at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
        at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
        at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
        at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
        at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
        at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
        at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
        at java.lang.Thread.run(Thread.java:595)
 

please help me out ... as soon as possible.

[Jaikiran Pai]

at org.apache.jasper.util.SystemLogHandler.findStream(SystemLogHandler.java:105) at org.apache.jasper.util.SystemLogHandler.println(SystemLogHandler.java:214) at org.apache.jasper.util.SystemLogHandler.println(SystemLogHandler.java:214) at org.apache.jasper.util.SystemLogHandler.println(SystemLogHandler.java:214) at advertBeans.AdvertStart.init(AdvertStart.java:9)

Post the code inside the init() method of advertBeans.AdvertStart class.
Looks like you are using SystemLogHandler.println in your code. Do you actually want to use that or were you supposed to use:

System.out.println("some message");

[Em Aiy]

yeah i am using System.err.println(""); to debug it, since my debugger is not letting me to do so ... if the problem is due to this sytem thing then can you explain me what is the reason for it ??

here is the code

package advertBeans;
 
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
 
public class AdvertStart extends HttpServlet{
    public void init() throws ServletException {
System.err.println("-----This is start----");
        String path= null;
        String path2= null;
        String propfile= null;
        String logFile= null;
        
Environment env = new Environment();
        
        int OsType = env.getSystemType();
        
        try{
            if(OsType == 0){
                path = getServletConfig().getServletContext().getRealPath(getServletConfig().getServletName());
                path = path.substring(0, path.lastIndexOf("\\"));
                propfile= path+"\\config\\db.cfg";
                logFile=path+"\\logs\\Error.log";
            }else{
                path = getServletConfig().getInitParameter("ADVERT_HOME");
                propfile= path+"/config/db.cfg";
                logFile=path+"/logs/Error.log";
            }
            //Storing the configuration file path into DB class.
            
            LogError.setConfFilePath(logFile);
            DB.setConfFilePath(propfile);
            
        }catch(Exception e){
            System.out.println("Error in AdvertStart Servlet's init : \n"+e);
            
        }
    }
 

I am trying to omit all the system function to check it. waiting for your reply.


--------------------------------------------------------------------------
Hey, i have omited all Syste.err.println(""); lines and it is working properly. emm, can you explain the reason?
[ August 01, 2006: Message edited by: Muhammad Ali Amin ]

[Em Aiy]

I am waiting for the explanation

[Bear Bibeault]

Originally posted by Muhammad Ali Amin:
I am waiting for the explanation

Everyone who answers questions here is a volunteer. Demanding answers in this manner will just tick people off. How rude!

I'd be a lot nicer and a lot more patient and read this.

[Em Aiy]

he told me the solution but did not tell me why i am getting the error. I want to know the reason behind it ... is it agains the rules? i am not forcing someone to solve my problem. My problem has already been solved, I am just asking HOW? so that it may help me to get more understanding and to help others in future.

[Jaikiran Pai]

I actually dont know the reason why its throwing a NullpointerException(thats the reason why i did not reply to your post )

I mentioned that particular solution to you based on what i could see in the stacktrace.

[Em Aiy]

emm, Thanks.