Accessing Liferay 6.1 from other applications (Liferay APIs)

[Brad S, modificado 11 Anos atrás.]

I have a Java application that runs on the same server as my Liferay server (but not in the same JVM). I want to access Liferay for login validation, user information and additional content.

What is the most efficient way to do that from the Liferay APIs:

1) SOAP

2) JSON

3) The documentation states the "The API supports Java invocation".
What is "Java invocation"?
How do I do that from Java my java application?
Are there Liferay examples of how to do it?

4) The documentation also states that you can "use the API through Remote Procedure Calls"
Are there examples of how that works and how to implement it.

How secure are these methods?

What is the best choice?

Thank you for the help!

[David H Nebinger, modificado 11 Anos atrás.]

Just use the soap web services. Looks like you're trying to read too much into what the doco says, they're all fancy ways of saying java soap web services.