<project>
   [...]
  <properties>
   <tomcat.version>6.0.29</tomcat.version>
   [...]
  </properties>
   [...]
  <build>
    <pluginManagement>
      <plugins>
        <plugin>
          <groupId>org.apache.tomcat.maven</groupId>
          <artifactId>tomcat6-maven-plugin</artifactId>
          <version>2.3-SNAPSHOT</version>
          <dependencies>
            <dependency>
              <groupId>org.apache.tomcat</groupId>
              <artifactId>catalina</artifactId>
              <version>${tomcat.version}</version>
            </dependency>
            <dependency>
              <groupId>org.apache.tomcat</groupId>
              <artifactId>catalina-ha</artifactId>
              <version>${tomcat.version}</version>
              <scope>runtime</scope>
            </dependency>
            <dependency>
              <groupId>org.apache.tomcat</groupId>
              <artifactId>tribes</artifactId>
              <version>${tomcat.version}</version>
              <scope>runtime</scope>
            </dependency>
            <dependency>
              <groupId>org.apache.tomcat</groupId>
              <artifactId>el-api</artifactId>
              <version>${tomcat.version}</version>
              <scope>runtime</scope>
            </dependency>
            <dependency>
              <groupId>org.apache.tomcat</groupId>
              <artifactId>jasper</artifactId>
              <version>${tomcat.version}</version>
              <scope>runtime</scope>
            </dependency>
            <dependency>
              <groupId>org.apache.tomcat</groupId>
              <artifactId>jasper-el</artifactId>
              <version>${tomcat.version}</version>
              <scope>runtime</scope>
            </dependency>
            <dependency>
              <groupId>org.apache.tomcat</groupId>
              <artifactId>jasper-jdt</artifactId>
              <version>${tomcat.version}</version>
              <scope>runtime</scope>
            </dependency>
            <dependency>
              <groupId>org.apache.tomcat</groupId>
              <artifactId>jsp-api</artifactId>
              <version>${tomcat.version}</version>
              <scope>runtime</scope>
            </dependency>
            <dependency>
              <groupId>org.apache.tomcat</groupId>
              <artifactId>servlet-api</artifactId>
              <version>${tomcat.version}</version>
              <scope>runtime</scope>
            </dependency>
            <dependency>
              <groupId>org.apache.tomcat</groupId>
              <artifactId>coyote</artifactId>
              <version>${tomcat.version}</version>
              <scope>runtime</scope>
            </dependency>
            <dependency>
              <groupId>org.apache.tomcat</groupId>
              <artifactId>dbcp</artifactId>
              <version>${tomcat.version}</version>
              <scope>runtime</scope>
            </dependency>
          </dependencies>
        </plugin>
        [...]
      </plugins>
    </pluginManagement>
    [...]
  </build>
  [...]
</project>