Request.setAttribute with strings that hold URLs

Hi,
In my servlet I do request.setAttribute(stringKey,stringValue) and then dispatch to a jsp. In that jsp I use the attributes with value = request.getparameter(stringKey) and value I use in <c:import> tags.
This value is a string that holds complete URLs!
Now upon doing this I get ArrayIndexOutOfBoundsException. How to solve this?
Hope someone can explain me what's wrong and what possible solution there is.
Greets,
Timv
java.lang.ArrayIndexOutOfBoundsException: 20
     at org.apache.catalina.util.RequestUtil.URLDecode(RequestUtil.java:465)
     at org.apache.catalina.util.RequestUtil.URLDecode(RequestUtil.java:427)
     at org.apache.catalina.util.RequestUtil.URLDecode(RequestUtil.java:391)
     at org.apache.catalina.core.ApplicationContext.getRequestDispatcher(ApplicationContext.java:615)
     at org.apache.catalina.core.ApplicationContextFacade.getRequestDispatcher(ApplicationContextFacade.java:174)
     at org.apache.taglibs.standard.tag.common.core.ImportSupport.acquireString(ImportSupport.java:302)
     at org.apache.taglibs.standard.tag.common.core.ImportSupport.doEndTag(ImportSupport.java:179)
     at jasper.disclaimer_jsp._jspService(_disclaimer_jsp.java:131)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.iplanet.ias.web.jsp.JspServlet$JspServletWrapper.service(JspServlet.java:552)
     at com.iplanet.ias.web.jsp.JspServlet.serviceJspFile(JspServlet.java:368)
     at com.iplanet.ias.web.jsp.JspServlet.service(JspServlet.java:287)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)
     at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)
     at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:158)
     at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)

Ok, sorry, I was too fast..
I was using rtexpr (<%=parameter%>) instead of ${parameter}",
greets

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