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<!-- embedded Tomcat -->
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-core</artifactId>
    <version>7.0.37</version>
</dependency>
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-logging-log4j</artifactId>
    <version>7.0.37</version>
</dependency>
<dependency>
    <groupId>org.apache.tomcat.embed</groupId>
    <artifactId>tomcat-embed-jasper</artifactId>
    <version>7.0.37</version>
</dependency>

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public final class StartServer {

    private StartServer() {
    }

    public static void main(String[] args) throws Exception {
        
        // We will set the basedir Systemproperty accordingly when running the Program
        // Actually the mavenplugin appassembler will do this for us
        String basedir = System.getProperty("basedir");
        String webappLocation = new File(basedir + "/webapp").getAbsolutePath();
        int port = 8080;

        Tomcat tomcat = new Tomcat();
        tomcat.setPort(port);
        tomcat.addWebapp("/", webappLocation);
        tomcat.start();
        tomcat.getServer().await();
    }
}

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<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-war-plugin</artifactId>
    <version>2.3</version>
    <executions>
        <execution>
            <id>war-exploded</id>
            <phase>package</phase>
            <goals>
                <goal>exploded</goal>
            </goals>
            <configuration>
                <webappDirectory>${project.build.directory}/myapp/webapp</webappDirectory>
                <archiveClasses>true</archiveClasses>
            </configuration>
        </execution>
    </executions>
</plugin>

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<plugin>
    <groupId>org.codehaus.mojo</groupId>
    <artifactId>appassembler-maven-plugin</artifactId>
    <version>1.3</version>
    <configuration>
        <assembleDirectory>${project.build.directory}/myapp</assembleDirectory>
        <repositoryLayout>flat</repositoryLayout>
        <repositoryName>webapp/WEB-INF/lib</repositoryName>
        <generateRepository>false</generateRepository>
        <copyConfigurationDirectory>true</copyConfigurationDirectory>
        <configurationDirectory>conf</configurationDirectory>
        <programs>
            <program>
                <mainClass>com.myapp.StartServer</mainClass>
                <name>myapp</name>
            </program>
        </programs>
    </configuration>
    <executions>
        <execution>
            <phase>package</phase>
            <goals>
                <goal>assemble</goal>
            </goals>
        </execution>
    </executions>
</plugin>