Added exists method with specification to JpaSpecificationExecutor.

[DiegoKrupitza]

It is now possible to make existence checks with Specifications. This is an addition to checking existence with using an Example.

Closes #2388

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[DiegoKrupitza]

@schauder
Question becasue of commit (af28245).

I use the import order and code format file from here but it seems to be not correct. Therefore I wanted to ask if this style guide is the correct one (since it is also listed in the contribution guidelines) or am I'm doing something wrong?

[schauder]

Thanks

That's merged, polished and ported to 3.0.x.

[schauder]

@schauder Question becasue of commit (af28245).

I use the import order and code format file from here but it seems to be not correct. Therefore I wanted to ask if this style guide is the correct one (since it is also listed in the contribution guidelines) or am I'm doing something wrong?

That is very much correct, but it requires some extra settings mentioned at the bottom.
Specifically this one seems to be off/missing in your configuration

Class count to use import with *: 10

[DiegoKrupitza]

@schauder Question becasue of commit (af28245).
I use the import order and code format file from here but it seems to be not correct. Therefore I wanted to ask if this style guide is the correct one (since it is also listed in the contribution guidelines) or am I'm doing something wrong?

That is very much correct, but it requires some extra settings mentioned at the bottom. Specifically this one seems to be off/missing in your configuration

Class count to use import with *: 10

Ok thank you!