Q:

How can I package a jar with Maven and include some dependencies in WEB-INF/lib? 

How can I package a jar with Maven and include some dependencies in WEB-INF/lib? 
I tried with assembly, but cannot be achieved easier?  

A:

Try using the jar-with-dependencies feature of the maven-assembly-plugin:
<plugin>
    <artifactId>maven-assembly-plugin</artifactId>
    <version>2.2.1</version>
    <configuration>
        <descriptorRefs>
            <descriptorRef>jar-with-dependencies</descriptorRef>
        </descriptorRefs>
    </configuration>
    <executions>
        <execution>
            <id>make-assembly</id> 
            <phase>package</phase>
            <goals>
                <goal>single</goal>
            </goals>
        </execution>
    </executions>
</plugin>

This will incorporate all dependencies into your jar.  Mark the dependencies that you don't want included in your jar with <scope>provided</scope>, eg:
<dependency>
    <groupId>net.sf.ehcache</groupId>
    <artifactId>ehcache-core</artifactId>
    <version>2.4.4</version>
    <scope>provided</scope>
</dependency>

