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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[JAVA-555] Incorrect object type received in BSONObject encoding hook (Transformer) when multiple transformers found</title>
                <link>https://jira.mongodb.org/browse/JAVA-555</link>
                <project id="10006" key="JAVA">Java Driver</project>
                    <description>&lt;p&gt;When multiple encoding hooks are found for a class in BSONObject, they are applied linearly:&lt;/p&gt;

&lt;p/&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;List&amp;lt;Transformer&amp;gt; l = _encodingHooks.get( o.getClass() );&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;if ( l != null )&lt;/span&gt;&lt;/pre&gt;
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					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;  for ( Transformer t : l )&lt;/span&gt;&lt;/pre&gt;
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						&lt;td  style=&quot; line-height: 1.4em !important; padding: 0em; vertical-align: top;&quot;&gt;
					&lt;pre style=&quot;font-size: 1em; margin: 0 10px;   margin-bottom: 10px;  width: auto; padding: 0;&quot;&gt;&lt;span style=&quot;color: black; font-family: &apos;Consolas&apos;, &apos;Bitstream Vera Sans Mono&apos;, &apos;Courier New&apos;, Courier, monospace !important;&quot;&gt;    o = t.transform( o );&lt;/span&gt;&lt;/pre&gt;
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&lt;p/&gt;

&lt;p&gt;If the first transformer found transforms from C to T and the second from C to R (both were registered as encoding hooks for class C or one of its superclasses):&lt;br/&gt;
1. The first transformer transforms o (of type C) to o&apos; of type T&lt;br/&gt;
2. The second transformer, programmed to transform things of type C receives an object of type T, which is potentially unrelated to C. So, we receive an object of an unexpected type.&lt;/p&gt;

&lt;p&gt;Solution would be to apply the first transformer (getting o&apos; of type T) and then looking for encoding hooks for class T and so on, until no encoding hooks are found.&lt;/p&gt;

&lt;p&gt;Apart from that, if I have a class C1 that extends C2 and I have encoding hooks for both (EH1 and EH2), when given an object of type C2 to DBObject, EH2 should be applied, not EH1, since C2 is more specific than C1. Currently, it applies both (and this is how I found what I explained earlier).&lt;/p&gt;</description>
                <environment></environment>
        <key id="36758">JAVA-555</key>
            <summary>Incorrect object type received in BSONObject encoding hook (Transformer) when multiple transformers found</summary>
                <type id="4" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14710&amp;avatarType=issuetype">Improvement</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="2">Won&apos;t Fix</resolution>
                                        <assignee username="-1">Unassigned</assignee>
                                    <reporter username="jordipradel">Jordi Pradel</reporter>
                        <labels>
                    </labels>
                <created>Fri, 20 Apr 2012 09:16:07 +0000</created>
                <updated>Wed, 8 Nov 2017 15:17:18 +0000</updated>
                            <resolved>Wed, 8 Nov 2017 15:17:18 +0000</resolved>
                                                                    <component>BSON</component>
                                        <votes>0</votes>
                                    <watches>1</watches>
                                                                                                                <comments>
                            <comment id="1720384" author="jeff.yemin" created="Wed, 8 Nov 2017 15:17:18 +0000"  >&lt;p&gt;We are no longer investing in the Transformer API, so closing as Won&apos;t Fix.&lt;/p&gt;

&lt;p&gt;As an alternative, consider creating configuating a &lt;tt&gt;DocumentCodec&lt;/tt&gt; as needed and add it to the &lt;tt&gt;CodecRegistry&lt;/tt&gt; on the &lt;tt&gt;MongoClient&lt;/tt&gt;.&lt;/p&gt;</comment>
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