Status: New
Owner: [email protected]
Labels: Type-Defect Priority-Medium
New issue 288 by [email protected]: Generated java hashcode() function
inconsistent across JVMs.
http://code.google.com/p/protobuf/issues/detail?id=288
What steps will reproduce the problem?
1. Write program that serializes a single String into a simple one-field
protobuf with java_generate_equals_and_hashcode enabled.
2. Run it, construct one, print myMsg.hashcode().
3. Do it again. Note difference.
Looking at the generated hashcode() function, I found the issue. The
hashcode incorporates getDescriptorForType().hashCode();. This returns an
instance of com.google.protobuf.Descriptors.Descriptor, which inherits
hashcode() from object.
This violates the contract with equals(). You can probably just remove
that line and get the correct behavior, unless it's there for a reason that
I don't understand. (I suppose you could also add the == constraint to
equals and satisfy the contract but that helps nobody).
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