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POWhy is Mybatis mapper scanner picking up wrong class
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  1. POWhy is Mybatis mapper scanner picking up wrong class
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    copied!<p>I use Spring with Mybatis. I have it configured to scan for mappers in my whole project and I assumed it determined a mapper because it found an XML file which has reference to a java interface.</p> <p>But this is proven incorrect today because I had to add a new interface which is not a mapper class and Mybatis thinks it is, so it is causing problems in my app due to this error:</p> <p>Mapped Statements collection does not contain value for com.blah.MyInterface.someMethod</p> <p>com.blah.MyInterface is just a simple interface which I needed to be included in Spring context so I gave it the @Component tag. Is that the wrong tag to use? Is that where the confusion comes from?</p> <p>I just needed to create this interface so that I can have a proxy wrap my database calls in one place where I can put a @Transactional tag, since Spring ignores it when it is in my Controller method.</p> <p>Sample code</p> <pre><code>package com.blah.something; @Component public interface MyInterface { public void someMethod( SomeObject obj) throws Exception; } package com.blah.something; public class MyImplementation implements MyInterface { @Transactional public void someMethod( SomeObject obj) throws Exception { ... do a whole bunch of stuff } } </code></pre> <p>I dont want this included in the MyBatis mappers! </p> <p>Edit: added the mybatis config xml as requested:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;!DOCTYPE configuration PUBLIC "-//mybatis.org//DTD Config 3.0//EN" "http://mybatis.org/dtd/mybatis-3-config.dtd"&gt; &lt;configuration&gt; &lt;settings&gt; &lt;setting name="lazyLoadingEnabled" value="false" /&gt; &lt;setting name="defaultStatementTimeout" value="60"/&gt; &lt;/settings&gt; &lt;typeAliases&gt; &lt;typeAlias alias="StripTrailingZerosBigDecimalTypeHandler" type="com.blah.typehandlers.StripTrailingZerosBigDecimalTypeHandler"/&gt; &lt;/typeAliases&gt; &lt;/configuration&gt; </code></pre> <p>This is the part of my spring xml config which calls the mybatis mapper scanner:</p> <pre><code>&lt;bean class="org.mybatis.spring.mapper.MapperScannerConfigurer"&gt; &lt;property name="basePackage" value="com.blah" /&gt; &lt;/bean&gt; </code></pre> <p>So I set it to scan the whole project which includes my interface above but I can't imagine it just grabs every single interface and considers them all mappers! </p> <p>In my debug log I see mybatis picking up my interface:</p> <pre><code>12/9/13 11:18:44 904 [org.mybatis.spring.mapper.MapperScannerConfigurer$Scanner.findCandidateComponents:4125] - Scanning file [D:\Weblogic\wls11\domains\ldapdomain\autodeploy\default\WEB-INF\classes\com\blah\MyInterface.class] 12/9/13 11:18:44 904 [org.mybatis.spring.mapper.MapperScannerConfigurer$Scanner.findCandidateComponents:4125] - Identified candidate component class: file [D:\Weblogic\wls11\domains\ldapdomain\autodeploy\default\WEB-INF\classes\com\blah\MyInterface.class] 12/9/13 11:18:44 904 [org.mybatis.spring.mapper.MapperScannerConfigurer$Scanner.findCandidateComponents:4125] - Scanning file [D:\Weblogic\wls11\domains\ldapdomain\autodeploy\default\WEB-INF\classes\com\blah\MyImplementation .class] 12/9/13 11:18:44 904 [org.mybatis.spring.mapper.MapperScannerConfigurer$Scanner.findCandidateComponents:4125] - Ignored because not a concrete top-level class: file [D:\Weblogic\wls11\domains\ldapdomain\autodeploy\default\WEB-INF\classes\com\blah\MyImplementation .class] </code></pre> <p>There is no XML for this interface, there is no mapper namespace for it, it's just a plain old regular interface and MyBatis should not be thinking it is a mapper service</p>
 

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