Given: <c-rt:import url='<%= null %>'/> Generates the following: java.lang.NullPointerException at o.a.t.s.tag.common.core.ImportSupport.isAbsoluteUrl(ImportSupport.java:481) at o.a.t.s.tag.common.core.ImportSupport.isAbsoluteUrl(ImportSupport.java:467) at o.a.t.s.tag.common.core.ImportSupport.doStartTag(ImportSupport.java:150) at o.a.jsp.negativeUrlNullTest$jsp._jspService(negativeUrlNullTest$jsp.java:167) Section 7.4, page 7-59 of the PD Spec: "If url is null or empty, a JspTagException is thrown." This works fine with the EL version if the import tag.
Fixed.