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Editorial Team
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Asked: 2026-06-07T04:06:25+00:00

I am using Axis to call a SOAP-based web service. I’m then trying to

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I am using Axis to call a SOAP-based web service. I’m then trying to serialize the returned remote object as JSON, using the Google Gson library.

The serialization to JSON fails, with Gson complaining that “there are multiple elements with the name __equalsCalc()).

When I inspect the returned object in my IDE (Eclipse), I can see that this is true — the returned object has three members called __equalsCalc() and another three called __hashCode.

I know from looking around that these are added by WSDL2Java (I think) in order to avoid recursion. My question is, why are there THREE of each? And how can I get the serializer to ignore these? They’re not actually part of the object’s definition (it’s called a RemoteProject, for reference). Can I do something hackish like cast the RemoteProject to a RemoteProject to get it to drop those members?

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1 Answer

  1. Editorial Team

    This turns out to be not too hard to solve. I have multiple copies of the same instance var because the class being serialized is shadowing fields of the same name from superclasses. Since I don’t care about these fields, the best approach in Gson is to write a custom ExckusionStrategy which can selectively ignore fields based on their name:

    http://google-gson.googlecode.com/svn/trunk/gson/docs/javadocs/com/google/gson/ExclusionStrategy.html

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