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I use Eclipse and 64-bit Windows and develop Java desktop applications. So far, I have only used the 32-bit JDK, but is there any reason to change to 64-bit JDK for Java development?
No, for your development-time activities, 32 bits is likely to be enough.
The newest JVMs support pointer compression, but otherwise, the 64-bit version of an application requires more memory to run. Only use 64-bits if your application needs to address more memory (32 bits should address 4 Gb, but OS considerations sometimes make this less).
Besides wasting a bit of memory, a 64-bit version shouldn’t be a problem, but anecdotally, all of the inexplicable crashes of the usually rock-solid JVM I hear complaints about are in 64-bit versions. It could be the OS or other factors, but if you don’t have a reason for 64 bits, why push your luck?