Warning: To avoid potential deadlock networking, should be performed in a diff.thread.

[vibhor Bhat]

hi,
i am trying to do networking with the help of HttpConnection class but always get this warning either i use thread or not..


Warning: To avoid potential deadlock, operations that may block, such as
networking, should be performed in a different thread than the
commandAction() handler.

and after this the MIDP application is not working.

this is my code & it is a code for a mobile application.
anybody can please update this code because i am trying to call in a different thread but its not working.

public void commandAction(Command command, Displayable displayable) throws ApplicationException
{
	if (command == signin)
	{ 
	HttpConnection http = null;
	InputStream iStrm = null;        

	// Data is passed at the end of url for GET

      String url = "http://localhost:8080/examples/servlet/WebsiteDemo_CallServletGET6" + "?" +
      "account=" + username.getString() + "&" + 
                 "password=" + password.getString();
	
		try
    		{
      		http = (HttpConnection) Connector.open(url);
	
      
		      // Client Request
     			
		      // Send request method

		      http.setRequestMethod(HttpConnection.GET);

		      // Server Response
		     
		      if (http.getResponseCode() == HttpConnection.HTTP_OK)
      		{
			  iStrm = http.openInputStream();      

		        // Get body (data)

			  int length=8; 	
			  if (length > 0)
        			{
         			 byte servletData[] = new byte[length];
         			iStrm.read(servletData);

			      // Update the string item on the display

			      String stemp= new String(servletData);
		   	      char[] ctemp = stemp.toCharArray();
				
		            int check=(int)ctemp[0] ;
		            if(check != '0')
					{
					alert=new Alert("Authentic","The User is authentic",null,null);
					alert.setTimeout(Alert.FOREVER);
					display.setCurrent(alert,form2);
					stringitem.setText(username.getString());
					chequenostring.setText(new String(servletData));
					schequeno =  new String(servletData);
					}
				else
					{
					alert=new Alert("ERROR","The user is not Authentic",null,null);
					alert.setTimeout(Alert.FOREVER);
					display.setCurrent(alert,form1);

					}
		            }
        		 else
          		 form1.append("Unable to read data");
    		  	 }
		http.close();
		iStrm.close();
    		}
    		catch (Exception e)
   		{
      	           form1.append("Network error in First Servlet"+e);
	      }
		
 
}	
		if (command == submit)
   		{
			if (email.size() == 0) 
			{       
				Type="email";
				Num=email.size();
				throw new ApplicationException(Type,Num);  	
				/* Complain about email  being invalid... */
			}
			if (payee.size()==0) 
			{       
				Type="Payee";
				Num=payee.size();
				throw new ApplicationException(Type,Num);
				/* Complain about size of the payeee feild  
			}
			if (dateofcash.getDate().getTime()<dateofissue.getDate().getTime())
			{
				Type="Dateofcash";
				Num=100;
				throw new ApplicationException(Type,Num);  
				/* Complain about Date of Cash being empty... */
			}

		      int amt=Integer.parseInt(amount.getString());
			if (amt >25000) 
			{       
				Type="Amount";
				Num=amt;
				throw new ApplicationException(Type,Num);  
				/* Complain about amount exceeding the maximum value... */
			}
		
			String s1;
		s1 = secretpass.getString();
		String secretfill;;
		secretfill="mcheques";
		if (!s1.equals(secretfill))
	      	{
				Type="secretpass";
			 	Num=secretpass.size();
				throw new ApplicationException(Type,Num);  

			}		 
                 if (amt <= 25000)
			{
                 HttpConnection http1 = null;
		     InputStream iStrm1 = null;    
		     String doi_send = (dateofissue.getDate()).toString();
		     String doc_send = (dateofcash.getDate()).toString();
		     String doi_new="";
		     String doc_new="";
		     int leni = doi_send.length();
		     int lenc = doc_send.length();
		     char[] cdoi = doi_send.toCharArray();
		     char[] cdoc = doc_send.toCharArray();
		     int i=0;
		     while(i<leni)
		     {
				if(cdoi[i]==' ')
				{
					i++;
				}
				else
				{
					doi_new = doi_new + cdoi[i];
					i++;
				}
			}
			i=0;

			while(i><lenc)
			{
				if(cdoc[i]==' ')
				{
					i++;
				}
				else
				{
					doc_new = doc_new + cdoc[i];
					i++;
				}
			}
		    // Data is passed at the end of url for GET

		    String url1 = "http://localhost:8080/examples/servlet/encryption_j2me11" + "?" +"user=" + username.getString() + "&" + "bcb=" + bcb.getText() + "&" + "email=" + email.getString() + "&" + "payee=" + payee.getString() + "&" + "doi=" + doi_new + "&" + "doc=" + doc_new
 + "&" + "amt=" + amount.getString() + "&" + "chequeno=" + schequeno;
              
			 
		       try
    		       {
      		http1 = (HttpConnection) Connector.open(url1);
		  
		      http1.setRequestMethod(HttpConnection.GET);
		       
			form2.append(dateofissue.getDate().toString());

		      if (http1.getResponseCode() == HttpConnection.HTTP_OK)
      		{
			  iStrm1 = http1.openInputStream();    
  
			  // Get body (data)

			  int length1 = url1.length();
			  if (length1 > 0)
        			{
         			 byte serveData[] = new byte[length1];
         			iStrm1.read(serveData);
				form2.append("You passed to the servlet: \n" + new String(serveData));

				String stemp1= new String(serveData);
		   	      char[] ctemp1 = stemp1.toCharArray();
				
		            int check1=(int)ctemp1[0] ;
				if(check1 == '1')
					{
						http1.close();
						iStrm1.close();
						display.setCurrent(submission);
					}
				}
				 
			}
        		 else 
          		 form1.append("Unable to read data");
    		  	 
    		}
    		catch (Exception e)
   			{
      			form2.append("Network error in Second Servlet"+e);
	      	}
	 
   		}
		}
   		else if (command == exit)
   			{
      			destroyApp(false);
	      		notifyDestroyed();
   			}
	}
}

[HENRY: Added Code Tags]

[Henry Wong]

anybody can please update this code because i am trying to call in a different thread but its not working.

How are you "trying to call in a different thread"? I don't see any threading code here.

Henry

[Chanakya Gupta]

Hi Vibhor

Sorry for picking up an old thread !
But we are getting the same error
while running a MIDlet.