Current docx4j works with WebSphere versions 8.5.5.9 and 9.0.0.5 in WebSphere’s default configuration (ie no need to change anything outside of your ear/war, except your security policy if enforced). docx4j v3.3.7 is recommended, since it contains an IBM JAXB specific fix.
For more, see https://www.docx4java.org/blog/2018/03/ ... here-2018/