src/it/MSOURCES-121/pom.xml

<?xml version="1.0" encoding="UTF-8"?>
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<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>org.apache.maven.its.sources</groupId>
  <artifactId>jar-no-fork</artifactId>
  <version>1.0-SNAPSHOT</version>

  <name>Test for multiple attachments of files</name>
	<description>This build should fail based on the duplicate
   execution with  the same configuration. This will errornously
   add the classifier/file twice times.
   MSOURCES-121.
  </description>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
  </properties>

  <build>
    <plugins>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-source-plugin</artifactId>
        <version>@project.version@</version>
        <executions>
          <execution>
            <id>attach-sources-1</id>
            <goals>
              <goal>jar-no-fork</goal>
            </goals>
          </execution>
          <execution>
            <id>attach-sources-2</id>
            <goals>
              <goal>jar-no-fork</goal>
            </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

</project>