Portal 7.31 upgrade from SP11 to SP14

Hi All,

We have the Portal 7.31 at SP 11 .

We have implemented the ESS/ MSS- ABAP applications.

And also we have setup the SSO to other Systems like-Success factors.

and have some custom JAVA application ( as war) .

Now we are planning to Upgrade from SP11 to SP14 , But before that we want to understand how this upgrade will affect our current functionality?

Do we also need to update other components ? Or ECC components also?

Thanks

_vishal