How to find where NSInvalidArgumentException (“data parameter is nil”) get's thrown?

Question

I\'m writing an iPad App and today I realized, that there\'s something wrong when there\'s no internet connection.

I get this very informative error:

Answer 1

In XCode you can add the Exception-Breakpoint which will halt the application right before it crashes fataly. You should give this one a try, if it works as it should, it will pause right on the line of code, that crashes your app.

How to add the exception-breakpoint

Answer 2

Use spring 3 version

Spring configuration : springService.xml

<context:component-scan base-package=" com.service.impl" />

<!-- Scheduler : Initial delay =5 minutes (5*60000 seconds) and repeat interval= 5 minutes-->
    <task:annotation-driven executor="myExecutor"
        scheduler="myScheduler" />
    <task:executor id="myExecutor" pool-size="1" />
    <task:scheduler id="myScheduler" pool-size="1" />

    <task:scheduled-tasks scheduler="myScheduler">
        <task:scheduled ref="batchUpdateServiceImpl"
            method="updateMe" fixed-delay="300000" initial-delay="300000"/>
        <task:scheduled ref="batchUpdateServiceImpl"
            method="updateYou"
            fixed-delay="300000"  initial-delay="300000"/>
    </task:scheduled-tasks>



Package Code :
com.service.impl

Class Name:
@Service
public class BatchUpdateServiceImpl {
    public void updateMe(){
    System.out.println(“update me”);
    }
    public void updateYou(){
    System.out.println(“update You”);
    }

}

Web.xml :
<context-param>
    <param-name>contextConfigLocation</param-name>
    <param-value>
            /WEB-INF/springService.xml
        </param-value>
  </context-param>