Receiving a null pointer back from the BigIP on Java program

This isn't the BIG-IP returning a null pointer exception, it's apache axis causing one. But, that's not to say it's not content in the response that's causing it. There really is no way of knowing without some knowledge of the code that's calling this. Although, the SystemInfo::get_system_information() method takes no parameters so odds are it's not in the client's request.

 

 

First question: Which version of Apache Axis and WSDL4j are you using?

 

 

Next: Is this the SystemInfo sample from the SDK? If not, can you provide a sample of the calling code. You'll have to make sure that you have the server certificate installed in your client truststore (or you could alternately use the XTrustProvider class included in the SDK).

 

 

If you are indeed using the sample code from the SDK, then the next step is to turn on iControl debugging. on the BIG-IP's console, type

 

 

$ b db iControl.LogLevel trace

 

$ bigstart restart httpd

 

 

Then iControl requests should log it's request and responses to the /var/log/ltm file on the BIG-IP. If it's not, then you may need to activate the local4 facility in the syslog-ng configuration file.

 

 

Make sure the local4 filter has the level set as follows:

 

 

local4.* /var/log/ltm

 

filter f_local4 {

 

facility(local4) and level(debug..emerg);

 

};

 

 

Then restart syslog-ng with a "b restart syslog-ng".

 

 

If you are still experiencing problems, if you could post the relevant entries from the /var/log/ltm file, we'll be able to diagnose the issue further.

 

 

-Joe