setDynamicAttribute not being invoked

[David Pantale]

Hi there, I can't seem to get the setDynamicAttribute method to work properly. I can get the application to print out the options but not the attributes. Below is my code (note I've been playing with it by commenting and uncommenting parts) :

 public class SelectTagHandler extends SimpleTagSupport
			implements DynamicAttributes {
	
	private List optionList;
	private String name;
	private String size;
	private Map<String, Object> tagAttrs = new HashMap<String, Object>();
	private static final String ATTR_TEMPLATE="%s='%s' ";
	private static final String OPTION_TEMPLATE
		="<option value'%1$s'> %1$s </option> ";

	
	public void setOptionsList(List arg1){
		optionList = arg1;
	}
	public void setName(String arg1){
		name = arg1;
	}
	//public void setSize(String arg1){
	//	size = arg1;
	//	System.out.println("setSize: " + size);
	//}
	
	public void doTag() throws JspException, IOException {
		PageContext pageContext = (PageContext)getJspContext();
		JspWriter out = pageContext.getOut();
		out.print("<select ");
		
		out.print(String.format(ATTR_TEMPLATE, "name", this.name));
		out.print(String.format(ATTR_TEMPLATE, "size", this.size));
		
		for(String attrName : tagAttrs.keySet()) {
			String attrDefinition = String.format(ATTR_TEMPLATE,
					attrName, tagAttrs.get(attrName));
			out.print(attrDefinition);
			System.out.println("Attrs: " + tagAttrs.size());
		}
		out.println(">");
		
		for(Object option:this.optionList){
			String optionTag = 
				String.format(OPTION_TEMPLATE, option.toString());
			out.println(optionTag);
		}
		out.println(" </select>");
	}
	
	public void setDynamicAttribute(String uri, String name, Object value){
		tagAttrs.put(name, value);
		System.out.println("setting dynamic attributes");
	}
}

the jsp:

	<p>Select Beer</p>
	Color:
	<formTags:select name='color' size='1' 
	optionsList='${applicationScope.colorList}' />
	<br></br>

the tld:

<?xml version="1.0" encoding="UTF-8" ?>
<taglib version="2.0" xmlns="http://java.sun.com/xml/ns/j2ee"    
  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    
  xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee web-jsptaglibrary_2_0.xsd">   
	
    <tlib-version>1.2</tlib-version>
    <jsp-version>1.2</jsp-version>
    <short-name>ClassicTags</short-name>
    <uri>DynamicAttribute</uri>
	<description>A tag library exercising SimpleTag handlers.</description>
    <tag>
	<description>Options list test</description>
    <name>select</name>
	<tag-class>foo.SelectTagHandler</tag-class>
	<body-content>scriptless</body-content>
        <attribute>
        	<name>optionsList</name>
        	<type>java.util.List</type>
        	<required>true</required>
        	<rtexprvalue>true</rtexprvalue>
         </attribute>
        <attribute>
            <name>name</name>
            <required>true</required>
         </attribute>
 <!--    <attribute>
            <name>size</name>
            <required>true</required>
         </attribute>  --> 
  		<dyanmic-attributes>true</dyanmic-attributes>
    </tag>
</taglib>

As I said, I can get it all to work except printing out the size attribute, to do that I have to put "out.print(String.format(ATTR_TEMPLATE, "size", this.size));" into my code.

Can anyone see why the setDynamicAttribute method is not being called by the container?

Thanks
Dave

[Christophe Verré]

<dyanmic-attributes>true</dyanmic-attributes> 

There's a typo here, it should be "dynamic-attributes".

[Jayavardhan geepi]

Hi..

I have the same problem even after checking all typos.

I'm getting jasperexception at the line of tag invocation.

It says root cause as :
java.lang.NullPointerException
customtag.simpletag.TestTag.<init>(TestTag.java:20)
org.apache.jsp.JSP.SimpleTagTest_jsp._jspx_meth_t_005fTest_005f0(SimpleTagTest_jsp.java:96)


Can someone help ... What might went wrong..?