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Getting JspCoreException while using EL

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I'm trying to get the JSP file name in my custom tag. So, i'm using the following code to achieve it.

But i'm getting the following error:

[Servlet Error]-[/WEB-INF/pages/auth/Signon.jsp]: com.ibm.ws.jsp.JspCoreException: /WEB-INF/pages/auth/Signon.jsp(29,83) JSPG0055E: Unable to create an xml attribute from name [${pageContext.request.requestURI}] value [/>]
at com.ibm.ws.jsp.translator.document.Jsp2Dom.getJspDocumentAsJspPage(Jsp2Dom.java:300)
at com.ibm.ws.jsp.translator.document.Jsp2Dom.getJspDocument(Jsp2Dom.java:179)
at com.ibm.ws.jsp.translator.JspTranslator.<init>(JspTranslator.java:73)
at com.ibm.ws.jsp.translator.JspTranslatorFactory.createTranslator(JspTranslatorFactory.java:116)
at com.ibm.ws.jsp.translator.utils.JspTranslatorUtil.translateJsp(JspTranslatorUtil.java:229)
at com.ibm.ws.jsp.translator.utils.JspTranslatorUtil.translateJspAndCompile(JspTranslatorUtil.java:114)
at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper.translateJsp(AbstractJSPExtensionServletWrapper.java:501)
at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper._checkForTranslation(AbstractJSPExtensionServletWrapper.java:428)
at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper.checkForTranslation(AbstractJSPExtensionServletWrapper.java:290)
at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionServletWrapper.handleRequest(AbstractJSPExtensionServletWrapper.java:145)
at com.ibm.ws.jsp.webcontainerext.AbstractJSPExtensionProcessor.handleRequest(AbstractJSPExtensionProcessor.java:286)

But when i try to print the file name as follows, then it prints the file name correctly:

Can some please explain what is wrong in the below code? Any help in this regard would be much appreciated.

(There seems to be no issues with my custom tag, because when i put some random literal string in place of then my tag works fine.)

Also please note in the custom tag; "pageContext.getRequest()" gives me an instance of ServletRequest; so i can not use "pageContext.getRequest().getRequestURI()" in my custom tag.
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You can't use a custom tag as the attribute value of a custom tag. Why are you using <c:out> at all? Just use the EL expression.
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