Getting "null" when trying to commit

Dear All,
am using Jdeveloper 11.1.1.3 ...
i have a master-detail jsp page , i tried to insert a new row and when i commit the transaction ( press on the commit button ) nothing happen i mean the transaction is not saved and when i checked the log of the IntegratedWebLogicServer i found the the commit generated no error just "null" was there in the log , i have other pages working correctly am not sure what is wrong with this one ...this is a very serious problem since no error message was generated to the user !!!
Any help please

problem solved !! the problem was that i wrote this statement
if ( ADFContext.getCurrent().getSessionScope().get("ClientType").equals("1") ) ....
and this session scope parameter returned null thats why ... i changed into the following then it worked if ( ADFContext.getCurrent().getSessionScope().get("ClientType") ==1 instead of .equals
but am not sure why this didnt generate an error message , that way we could know what is the problem

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Getting "null" when trying to commit

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