Ok, I get it. Just reference the mySQL-Lib in the plugin section.
<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>soapui</groupId>
<artifactId>soapui</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>runSaopUiTests</name>
<description>runs the soapUI tests</description>
<build>
<plugins>
<plugin>
<groupId>eviware</groupId>
<artifactId>maven-soapui-plugin</artifactId>
<version>4.0.1</version>
<executions>
<execution>
<id>soapUITest</id>
<goals>
<goal>test</goal>
</goals>
<phase>test</phase>
</execution>
</executions>
<configuration>
<projectFile>test-soapui-project.xml</projectFile>
<projectProperties>
<projectProperty>staging=STG</projectProperty>
</projectProperties>
<testSuite>test TestSuite</testSuite>
<testCase>test1</testCase>
<outputFolder>${project.build.directory}/</outputFolder>
</configuration>
<dependencies>
<!-- MySQL database driver -->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
<version>5.1.9</version>
<scope>runtime</scope>
</dependency>
<!--due to an issue in pom at soapui-plugin 4.0.1 we have to reference junit -->
<!-- http://www.soapui.org/forum/viewtopic.php?t=8190 -->
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>4.4</version>
<scope>test</scope>
</dependency>
</dependencies>
</plugin>
</plugins>
</build>
</project>