For the same reasons any 64-bit application is desirable, to be able to address more than 4G of VM. Although in this case it's not a particular app but the JVM for Java apps so in theory a64-bit JVM ...

ARM this week announced that it's inked a multi-year contract with Oracle to further optimize the existing Java Platform, Standard Edition (Java SE) for ARM 32-bit platforms and also to add Java SE ...