Hi Vivek,
For Java developer there are many options, If you know Java Scripting then go for SAPUI5. SAP is moving there web development with SAPUI5 which is nothing but jQuery.
SAPUI5 is now on demand skill.
Second option for you is SAP HANA Application development.Now days everyone talking about SAP HANA so its booming in market. Your role can be application developer. SAP HANA environment is nothing but Eclipse and all coding is similar to Java. Go to https://open.sap.com
here you will get free courses on HANA Development.
And the last option for you is SAP ABAP.
Thanks,
Sagar Kandalgaonkar