how do i specify a plugin when using java

so i have this piece of code

<%
CKEditorConfig settings = new CKEditorConfig();
settings.addConfigValue("width","100%");
settings.addConfigValue("height","800px");

%>
<ckeditor:replace replace="editor1" basePath="/ckeditor/" config="<%=settings %>" />

how do i specify a plugin.
the only examples i have found is when using javascript only
thanks
randy