llegal reflective access at HtmlPipelineContext constructor of itext 5

context: jdk11, springboot, itextpdf 5.5.13.3, ubuntu, eclipse

during: new HtmlPipelineContext(null); throughout new CssAppliersImpl(new XMLWorkerFontProvider()); and last CssAppliersImpl(){// map builder inside } appears

WARNING: An illegal reflective access operation has occurred
WARNING: Illegal reflective access by com.itextpdf.text.io.ByteBufferRandomAccessSource$1 (file:/home/awieclawski/.m2/repository/com/itextpdf/itextpdf/5.5.13.3/itextpdf-5.5.13.3.jar) to method java.nio.DirectByteBuffer.cleaner()
WARNING: Please consider reporting this to the maintainers of com.itextpdf.text.io.ByteBufferRandomAccessSource$1

question: how to avoid it?

PS. Before HtmlPipelineContext instance is established:

        CSSResolver cssResolver = new StyleAttrCSSResolver();
        cssResolver.addCss(cssFile);
 //     cssFile is returned from XMLWorkerHelper.getCSS(getCssStream(path));
    }

and at the debug of new HtmlPipelineContext(null); is signalized: com.sun.jdi.ClassNotLoadedException: Type has not been loaded occurred invoking method.