Sadly the Java bindings were way easier to use than Obj-C but it undermined Steve's vision.
If Java had become the primary language for Cocoa, the path to Cocoa Touch and an iPhone App Store could have been much more complicated.
When most of them rushed to adopt Objective-C, there was no reason to keep two stacks around, specially when they were still in the red, bleeding money.
I tried to and have _very much_ the opposite opinion about the ease of use.