How to add extra classpath entry to SoapUI plugin execution?

Thanks, mlenosgrande.

Another option would be adding dependencies element to soapUI maven plugin execution. From the POM reference:

Additional dependencies that this project needs to introduce to the plugin's classloader.

In this particular case I packed updated soapui-log4j.xml into soapUILog4jConfig.jar and uploaded it into my maven repo, then in pom I added:

<plugin>
   <groupId>eviware</groupId>
   <artifactId>maven-soapui-plugin</artifactId>
   <version>3.6.1</version>
   <configuration>
      <settingsFile>${basedir}/src/test/resources/soapui-settings.xml</settingsFile>
      <projectFile>${basedir}/src/test/resources/sifWS-soapui-project.xml</projectFile>
      <outputFolder>${project.build.directory}/soapui-output</outputFolder>
      <printReport>true</printReport>
      <junitReport>true</junitReport>
      <exportAll>true</exportAll>
      <soapuiProperties>
      <property>
        <name>soapui.logroot</name>
        <value>${project.build.directory}/soapui-logs/</value>
      </property>
      </soapuiProperties>
   </configuration>
   <dependencies>
     <dependency>
       <groupId>com.company</groupId>
       <artifactId>soapUILog4jConfig</artifactId>
       <version>1.0-SNAPSHOT</version>
     </dependency>
   </dependencies>
</plugin>

Notice that new dependencies element added.

Thanks to Magne from Stackoverflow.