mvn clean install does not include xml-apis-*.jar in jar file

[remold]

After a 'git clone' and 'mvn clean install' the created war file does not include a xml-apis-*.jar file.

This results in error:
SEVERE: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener
org.springframework.beans.factory.BeanDefinitionStoreException: Unexpected exception parsing XML document from class path resource [coin-api-properties-context.xml]; nested exception is java.lang.NoClassDefFoundError: org/w3c/dom/ElementTraversal

[surfnet-niels]

After fixing this, please also update the OpenConext VM as this currently has a workaround to fix for this issue.
See https://github.com/OpenConext/OpenConext-vm/blob/master/scripts/dependencies/tomcat_install.sh#L21