Socket give me error is null

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Hi everone

Actually I did app in Android (Eclipse) client server, but the compiler give me error
in this statement:

Java

try{
     Socket s = new Socket(IPAddress,PORT);
   }catch(Exception e){
       Log.e("Exception", e.getMessage());
   }

the error is

Java

println needs a message

sorry for English

Posted 21-Sep-14 20:19pm

Ammar Al-hamdabni

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Comments

Sergey Alexandrovich Kryukov 22-Sep-14 2:25am

Not error. Exception. I cannot believe this is the exception thrown by the code shown. Also, output the exception class name, not just message; at least.
—SA

Ammar Al-hamdabni 22-Sep-14 2:35am

thanks for response, Ok No Problem but when compiler give you null exception what does that mean.

Sergey Alexandrovich Kryukov 22-Sep-14 3:19am

It means that this is one of the simplest problem for the debugging. You are trying to dereference some object by using on of its instance members, while it is actually null. Fix it by checking the variable/member for null, do something else if it is; check up if you could miss initialization of the object.
—SA

Fredrik Bornander 22-Sep-14 3:39am

Log is a class, e is a static method on Log, he's passing null as the second parameter and e does not like that.

Sergey Alexandrovich Kryukov 22-Sep-14 3:48am

Ah, my bad... Than you very much.
—SA

1 solution

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This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Fredrik Bornander · Accepted Answer · 2014-09-21T21:11:00

You need to make sure the second argument passed to Log.e isn't null.
One way to do that would be to inspect e.getMessage() and log something else if it is null;

Java

try {
  Socket s = new Socket(IPAddress,PORT);
} catch(Exception e){
  String message = e.getMessage() == null ? e.toString() : e.getMessage();
  Log.e("Exception", e.getMessage());
}

Hope this helps,
Fredrik

Socket give me error is null

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Socket give me error is null

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