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I’m looking for a solution to generate a checksum for any type of Java object, which remains the same for every execution of an application that produces the same object.
I tried it with Object.hashCode(), but the api says
….This integer need not remain consistent from one execution of an application to another execution of the same application.
I had similar problem (generating good hashcode for XML files) and I found out that the best solution is to use MD5 through MessageDigest or in case you need something faster: Fast MD5. Please notice that even if
Object.hashCodewould be the same every time it is anyway too short (only 32 bits) to ensure high uniqueness. I think 64 bits is a minimum to compute good hash code. Please be aware that MD5 generates 128 bits long hash code, which should is even more that needed in this situation.Of course to use
MessageDigestyou need serialize (in your case marshall) the object first.