title: Mapstruct 1.2.0 not generating mapper class in springboot 2.0.0.M3 + lombok
body: <p>I'm trying to put together a sample project combining the following technologies:</p>
  
  <ul>
  <li>Spring boot (2.0.0.M3) </li>
  <li>Mapstruct (1.2.0.CR1) </li>
  <li>Lombok (1.16.18)</li>
  </ul>
  
  <p>I have defined this mapper:</p>
  
  <pre><code>@Mapper(componentModel = "spring")
  public interface SourceToTargetMapper {
  
      SourceToTargetMapper MAPPER = Mappers.getMapper( SourceToTargetMapper.class );
  
      @Mappings({ 
          @Mapping(source = "characteristics", target = "description"),
          @Mapping(source = "identifier", target = "id") 
      })
      public Target toTarget(Source source);
  }
  </code></pre>
  
  <p>The problem I am having is that the class implementing the SourceToTargetMapper interface is not being generated. </p>
  
  <p>That 's the trace I'm getting when i run the unit test:</p>
  
  <pre><code>2017-09-04 00:13:24.726 ERROR 1712 --- [           main] o.s.test.context.TestContextManager      : Caught exception while allowing TestExecutionListener [org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener@568bf312] to prepare test instance [io.alfredux.demo.MapperTest@5ccbeb64]
  
  org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'io.alfredux.demo.MapperTest': Unsatisfied dependency expressed through field 'sourceToTargetMapper'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'io.alfredux.demo.mapper.SourceToTargetMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
      at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:570) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:91) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:356) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1352) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireBeanProperties(AbstractAutowireCapableBeanFactory.java:399) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.injectDependencies(DependencyInjectionTestExecutionListener.java:118) ~[spring-test-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.test.context.support.DependencyInjectionTestExecutionListener.prepareTestInstance(DependencyInjectionTestExecutionListener.java:83) ~[spring-test-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.boot.test.autoconfigure.SpringBootDependencyInjectionTestExecutionListener.prepareTestInstance(SpringBootDependencyInjectionTestExecutionListener.java:44) ~[spring-boot-test-autoconfigure-2.0.0.M3.jar:2.0.0.M3]
      at org.springframework.test.context.TestContextManager.prepareTestInstance(TestContextManager.java:242) ~[spring-test-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.createTest(SpringJUnit4ClassRunner.java:227) [spring-test-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner$1.runReflectiveCall(SpringJUnit4ClassRunner.java:289) [spring-test-5.0.0.RC3.jar:5.0.0.RC3]
      at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:12) [junit-4.12.jar:4.12]
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.methodBlock(SpringJUnit4ClassRunner.java:291) [spring-test-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:246) [spring-test-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.runChild(SpringJUnit4ClassRunner.java:97) [spring-test-5.0.0.RC3.jar:5.0.0.RC3]
      at org.junit.runners.ParentRunner$3.run(ParentRunner.java:290) [junit-4.12.jar:4.12]
      at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:71) [junit-4.12.jar:4.12]
      at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:288) [junit-4.12.jar:4.12]
      at org.junit.runners.ParentRunner.access$000(ParentRunner.java:58) [junit-4.12.jar:4.12]
      at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:268) [junit-4.12.jar:4.12]
      at org.springframework.test.context.junit4.statements.RunBeforeTestClassCallbacks.evaluate(RunBeforeTestClassCallbacks.java:61) [spring-test-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.test.context.junit4.statements.RunAfterTestClassCallbacks.evaluate(RunAfterTestClassCallbacks.java:70) [spring-test-5.0.0.RC3.jar:5.0.0.RC3]
      at org.junit.runners.ParentRunner.run(ParentRunner.java:363) [junit-4.12.jar:4.12]
      at org.springframework.test.context.junit4.SpringJUnit4ClassRunner.run(SpringJUnit4ClassRunner.java:190) [spring-test-5.0.0.RC3.jar:5.0.0.RC3]
      at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:86) [.cp/:na]
      at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38) [.cp/:na]
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:459) [.cp/:na]
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:678) [.cp/:na]
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:382) [.cp/:na]
      at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:192) [.cp/:na]
  Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'io.alfredux.demo.mapper.SourceToTargetMapper' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
      at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1486) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1097) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1058) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
      at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:567) ~[spring-beans-5.0.0.RC3.jar:5.0.0.RC3]
      ... 29 common frames omitted
  </code></pre>
  
  <p>I believe there’s something missing or misplaced in the build/plugin section  of my pom.xml
   file</p>
  
  <pre><code>&lt;build&gt;
      &lt;plugins&gt;
          &lt;plugin&gt;
              &lt;groupId&gt;org.springframework.boot&lt;/groupId&gt;
              &lt;artifactId&gt;spring-boot-maven-plugin&lt;/artifactId&gt;
              &lt;configuration&gt;
                  &lt;source&gt;${java.version}&lt;/source&gt;
                  &lt;target&gt;${java.version}&lt;/target&gt;
                  &lt;annotationProcessorPaths&gt;
                      &lt;path&gt;
                          &lt;groupId&gt;org.mapstruct&lt;/groupId&gt;
                          &lt;artifactId&gt;mapstruct-processor&lt;/artifactId&gt;
                          &lt;version&gt;${org.mapstruct.version}&lt;/version&gt;
                      &lt;/path&gt;
                  &lt;/annotationProcessorPaths&gt;
              &lt;/configuration&gt;
          &lt;/plugin&gt;
      &lt;/plugins&gt;
  &lt;/build&gt;
  </code></pre>
  
  <p>The source code for the project can be checked here:</p>
  
  <p><a href="https://github.com/Alfredux79/mapstruct-lombock-springboot/tree/stack-overflow-question" rel="nofollow noreferrer">https://github.com/Alfredux79/mapstruct-lombock-springboot/tree/stack-overflow-question</a></p>
  
  <p>The problem can be reproduced downloading the branch and running the command:</p>
  
  <pre><code>mvn test
  </code></pre>
  
  <p>Thanks!</p>