[kaba0]

There is no vendor lock-in, other than perhaps the logo, OpenJDK is the same as OracleJDK, since Oracle develops the former 90+%.

[datavirtue]

The Oracle JDK ships with capabilities not found in OpenJDK. Oracle ships webkit for instance--to parse/render HTML. OpenJDK does not. There also used to be a JavaScript engine, which I believe was deprecated unfortunately, and does not ship with OpenJDK.