I am using websphere6.0 and i did the following to call a https webservice. I have a cert.pfx certificate that was given by the service provider.
1. I downloaded the following unrestricted policy files from IBM local_policy.jar and US_export_policy.jar and replaced the files present in the ....\runtimes\base_v6\java\jre\lib\security directory.
2. Opened the ikeyman present in the ....\runtimes\base_v6\bin\ folder.Selected Open-->Keydatabase type as PKCS12, file name as the cert.pfx, gave the file location, Clicked OK. It challenged for a password. I entered the password of the PFX file. The certifcate got loaded under personal certficate. Then i selected the certificate and imported it to the CACERTS store.
3. Then i wrote the following code.