sapjco3 DestinationDataProvider in netweaver cannot register

Hi Experts,

I was trying to connect from my java using sapjco3 with the help of Documentation provided.

But when i try

if (!Environment.isDestinationDataProviderRegistered()) {

                if (ABAP_AS_properties == null) {

                    ABAP_AS_properties = properties;

                }

                Environment.registerDestinationDataProvider(this);

       }

the code block in if statement never execute.(meaning data provider already registered) but I dont know which DataProvider already registered in the Environment. My class is singleton.

I tried Establishing a connection via Class but no luck.

is there any way to see which data provider already registered by program or by administration.

Thanks in advance for help.

Regards

Foysal