Thanks but I know that already. I think you misunderstood my problem. I have a bean on a page, and the user may remove the value of an attribute by using the delete key to remove the contents of a pre-populated text box. On the following page we use <jsp:setProperty...property="*"> or <jsp:setProperty...property="firstName"> to set all the values. This works fine for everything apart from empty strings.
Since the parameters are in the URL (ie. ?firstName=&secondName= ) this problem could be solved. Surely others have encountered this problem and there is another solution other than writing my own <jsp:setProperty.. or by going through each attribute on the previous page and setting it to an empty string before calling setProperty? I looked at the code for the <jsp:setProperty..> tag and the empty string problem appears to be embedded in the JspRuntimeLibrary introspector. -----Original Message----- From: Zerbe John W [mailto:[EMAIL PROTECTED] Sent: Friday, June 13, 2003 3:06 PM To: [EMAIL PROTECTED] Subject: Re: JSP:Setproperty and empty strings you can't use property="*" with value=, The property="*" expression tells the jsp compiler to generate code to use reflection to match up request params with bean fields. property - The name of the Bean property whose value you want to set If you set propertyName to * then the tag will iterate over the current ServletRequest parameters, matching parameter names and value type(s) to property names and setter method type(s), setting each matched property to the value of the matching parameter. If a parameter has a value of "", the corresponding property is not modified. > Thanks for your answer but this doesnt work! The following lines have no > affect on the bean: > <jsp:setProperty name="myBean" property="firstName" value="<%=null%>"/> > <jsp:setProperty name="myBean" property="firstName" value="<%=""%>"/> > <jsp:setProperty name="myBean" property="firstName" value=""/> > Also: > <jsp:setProperty name="myBean" property="*" value=""/> > or > <jsp:setProperty name="myBean" property="*" value="<%=""%>"/> > causes: > org.apache.jasper.JasperException: jsp.error.setProperty.invalid > Any other ideas? ========================= To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST". For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST DIGEST". Some relevant archives, FAQs and Forums on JSPs can be found at: http://java.sun.com/products/jsp http://archives.java.sun.com/jsp-interest.html http://forums.java.sun.com http://www.jspinsider.com ==========================================================================To unsubscribe: mailto [EMAIL PROTECTED] with body: "signoff JSP-INTEREST". For digest: mailto [EMAIL PROTECTED] with body: "set JSP-INTEREST DIGEST". Some relevant archives, FAQs and Forums on JSPs can be found at: http://java.sun.com/products/jsp http://archives.java.sun.com/jsp-interest.html http://forums.java.sun.com http://www.jspinsider.com
