a random working CAS maven overlay for a project with both custom Java and additions / changes to the XML files

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<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/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>edu.someone.cas</groupId>
  <artifactId>local-cas</artifactId>
  <packaging>war</packaging>
  <version>1.0-SNAPSHOT</version>

  <build>
    <plugins>
      <plugin>
        <artifactId>maven-war-plugin</artifactId>
        <configuration>
          <warName>cas</warName>
          <overlays>
            <overlay>
              <groupId>org.jasig.cas</groupId>
              <artifactId>cas-server-webapp</artifactId>
                <excludes>
                  <exclude>WEB-INF/lib/cas-client-core-3.1.10.jar</exclude>
                  <exclude>WEB-INF/lib/jaxb-impl-2.1.3.jar</exclude>
                  <exclude>WEB-INF/lib/commons-lang-2.4.jar</exclude>
                  <exclude>WEB-INF/lib/javassist-3.7.ga.jar</exclude>
                </excludes>
            </overlay>
            <overlay>
              <groupId>org.jasig.cas3.extensions</groupId>
              <artifactId>clearpass-webapp</artifactId>
                <excludes>
                  <exclude>WEB-INF/lib/cas-server-core-3.4.2.jar</exclude>
                  <exclude>WEB-INF/lib/spring-aop-3.0.1.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-asm-3.0.1.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-beans-3.0.1.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-binding-2.0.8.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-context-3.0.1.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-context-support-3.0.1.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-core-3.0.1.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-expression-3.0.1.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-jdbc-3.0.1.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-js-2.0.8.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-orm-3.0.1.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-tx-3.0.1.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-web-3.0.1.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-webflow-2.0.8.RELEASE.jar</exclude>
                  <exclude>WEB-INF/lib/spring-webmvc-3.0.1.RELEASE.jar</exclude>
                </excludes>
            </overlay>
          </overlays>
        </configuration>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <configuration>
          <source>1.5</source>
          <target>1.5</target>
        </configuration>
      </plugin>
    </plugins>
  </build>

  <dependencies>
    <dependency>
      <groupId>org.jasig.cas</groupId>
      <artifactId>cas-server-webapp</artifactId>
      <version>${cas.version}</version>
      <exclusions>
        <exclusion>
          <groupId>org.jasig.cas</groupId>
          <artifactId>cas-client-core</artifactId>
        </exclusion>
      </exclusions>
      <scope>runtime</scope>
      <type>war</type>
    </dependency>
    <dependency>
      <groupId>org.jasig.cas</groupId>
      <artifactId>cas-server-core</artifactId>
      <version>3.4.3</version>
    </dependency>
    <dependency>
      <groupId>org.jasig.cas</groupId>
      <artifactId>cas-server-support-ldap</artifactId>
      <version>${cas.version}</version>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>org.jasig.cas3.extensions</groupId>
      <artifactId>clearpass-webapp</artifactId>
      <version>1.0.5.GA</version>
      <exclusions>
        <exclusion>
          <groupId>org.jasig.cas</groupId>
          <artifactId>cas-server-core</artifactId>
        </exclusion>
      </exclusions>
      <scope>runtime</scope>
      <type>war</type>
    </dependency>

    <dependency>
      <groupId>commons-dbcp</groupId>
      <artifactId>commons-dbcp</artifactId>
      <version>1.4</version>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>org.hibernate</groupId>
      <artifactId>hibernate-entitymanager</artifactId>
      <version>3.5.0-CR-2</version>
      <scope>runtime</scope>
      <exclusions>
        <exclusion>
          <groupId>commons-collections</groupId>
          <artifactId>commons-collections</artifactId>
        </exclusion>
        <exclusion>
          <groupId>commons-lang</groupId>
          <artifactId>commons-lang</artifactId>
        </exclusion>
      </exclusions>
    </dependency>

    <dependency>
      <groupId>mysql</groupId>
      <artifactId>mysql-connector-java</artifactId>
      <version>5.1.13</version>
      <scope>runtime</scope>
    </dependency>

    <dependency>
      <groupId>javax.servlet</groupId>
      <artifactId>servlet-api</artifactId>
      <version>2.5</version>
        <scope>provided</scope>
    </dependency>


		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.7</version>
			<scope>test</scope>
		</dependency>

  </dependencies>

  <properties>
    <cas.version>3.4.3</cas.version>
  </properties>

  <repositories>
    <repository>
      <id>ja-sig</id>
      <url>http://oss.sonatype.org/content/repositories/releases/</url>
    </repository>
    <repository>
      <id>JBoss</id>
      <url>https://repository.jboss.org/nexus/content/groups/public-jboss/</url>
    </repository>
  </repositories>
</project>