(Solution) Star C3 Pro java.lang.NullPointerException error

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Problem:
The system window pops out an error message “An error has com.daimler.wis.client.net.http.DefaultClientCommunicationHandler occurred in: java.lang.NullPointerException ” when using Star C3 Pro with seven cable T30 HDD EPC software.

Possible reason:
NullPointerException is one of the common problems and is an Exception thrown by the JVM when you middleware or other parts of your software encounters the following conditions:

1) Try to invoke an instance method of a null object-     
2) Try to access or modify a particular field of a null object-      
3) Try to obtain the length of such null object as an array

Solution:
The problem possibly lies on the wrong setting in Java Control Panel. Do as following:
Click "Advanced"
Select "Perform certificate revocation checks on"
Select "Do not check (not recommended)"
Click OK to save setting