Hi Everyone,
Thankyou for getting into this and helping me to resolve this issue, actually in java. Security file security.useSystemPropertiesFile=true parameter is set true.
This is why any change i was doing in java.Security file was getting overridden with another/etc/crypto-policies/back-ends/java.config file on RSA keySize<2048 was mentioned.
Now i am able to connect successfully. Thankyou all for your valuable suggestion and help, really appreciate !!