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I thought it was NeXTSTEP/Sun, but it seems disputed. https://stackoverflow.com/questions/473758/what-does-the-ns-...

What they collaborated was in Distributed Objects Everywhere, which ended up becoming Java EE.

https://en.wikipedia.org/wiki/Distributed_Objects_Everywhere

Their collaboration is also one of the reasons why Java is basically Objective-C semantics with C++ like syntax.

https://cs.gmu.edu/~sean/stuff/java-objc.html

Interfaces (protocols), dynamic class loading (plugins), RMI (distributed objects), jars (bundles), dynamic dispatch by default, object root class,...

And I guess Cocoa (the initially Objective-C based application framework for macOS) was kind of a wordplay on Java again.

It’s like Java, just sweeter ;)

During OS X early days, Apple wasn't sure that the Mac OS developer community groomed on Object Pascal and C++, was that keen into embracing Objective-C.

So they jumped into the Java hype, created their own JVM implementation, with Swing extensions for the OS X UI, and Cocoa Bridge was born for Objective-C interop, with bindings for all key Apple techonologies like Quicktime and such.

When it became clear that Objective-C wasn't going to be an adoption problem, instead of using a 3rd party owned language, they dropped support for Java and eventually gave their implementation to OpenJDK.

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