You can find sample client code at Sample.java
to POST docx content to the Converter endpoint URL
You can configure the endpoint at line 37 in the sample code
From version 3.3.0, docx4j uses the PDF Converter by default. (If you are using an earlier version of docx4j, you can/should use the above approach.)
Out of the box, version 3.3.0 of docx4j uses converter-eval.plutext.com
To convert to PDF, use the docx4j facade:
where wordMLPackage is a docx4j wordMLPackage, and os is an OutputStream.
You should however install your own instance! You can download an installer from the PDF Converter downloads page
To use your own instance, tell docx4j where it is.
You can do that via docx4j property "com.plutext.converter.URL".
You should set that in docx4j.properties; a sample properties file can be found on GitHub
Add docx4j.properties to your classpath, if you didn't have it already.
Or alternatively, you could set the property programmatically:
Docx4jProperties.setProperty( "com.plutext.converter.URL", "https://converter-eval.plutext.com:443/v1/00000000-0000-0000-0000-000000000000/convert");
The only part of the URL you should alter is host name and port.