EntityManagerFactory is null

[joymallyac]

I have been following the steps shown in articles-java-jee to create EntityManagerFactory. I have made the necessary changes in persistence.xml,server.xmland also put beans.xmlinside WEB-INFfolder. In spite of that when I create EntityManagerFactory, it becomes null.

@PersistenceContext(name = "jpa-unit") static EntityManagerFactory emf; 
 static EntityManager em = emf.createEntityManager();

Persistence.xml

<persistence version="2.2"
    xmlns="http://xmlns.jcp.org/xml/ns/persistence" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence 
                        http://xmlns.jcp.org/xml/ns/persistence/persistence_2_2.xsd">
    <persistence-unit name="jpa-unit" transaction-type="JTA">
        <jta-data-source>jdbc/articlejpadatasource</jta-data-source>       
        <properties>
            <property name="eclipselink.ddl-generation" value="create-tables"/>
            <property name="eclipselink.ddl-generation.output-mode" value="both" />
        </properties>
    </persistence-unit>
</persistence>

Server.xml

<library id="DB2JCCLib">
        <fileset dir="${shared.resource.dir}/db2jars" includes="jcc*.jar"/>
    </library>

    <dataSource id="articlejpadatasource"
              jndiName="jdbc/articlejpadatasource">
        <jdbcDriver libraryRef="DB2JCCLib" />
        <properties.db2.jcc databaseName=""
            portNumber="50000"
            serverName=""         
            user="" 
            password="" />
  </dataSource>

beans.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://xmlns.jcp.org/xml/ns/javaee"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/javaee http://xmlns.jcp.org/xml/ns/javaee/beans_1_1.xsd"
    bean-discovery-mode="all">
</beans>

pom.xml

<dependency>
       <groupId>com.ibm.db2</groupId>
       <artifactId>jcc</artifactId>
       <version>11.1.4.4</version>
    </dependency>

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-dependency-plugin</artifactId>
    <version>2.10</version>
    <executions>
            <execution>
                    <id>copy-jcc-dependency</id>
                    <phase>package</phase>
                    <goals>
                            <goal>copy-dependencies</goal>
                    </goals>
                    <configuration>
                            <includeArtifactIds>jcc</includeArtifactIds>
                            <outputDirectory>${project.build.directory}/</outputDirectory>
                    </configuration>
            </execution>
    </executions>
    </plugin>

What am I missing?