two directbuffer have same address?

[zhang Jackie]

hi
  I am using directbuffer and JNI to build a high speed network library. But
When I use the directbuffer, I found some directbuffers have the same memory
address(got by  GetDirectBufferAddress method). I think the memory
allocation of directbuffer is not reasonable enough.
 Can someoen give me some advice, Thanks

Best Regards!
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