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Struts & Hibernate
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| | | Tomcat 5 & Custom Tag Variable Problems | Tomcat 5 & Custom Tag Variable Problems 2004-01-06 - By Richard Wareing
Back
Well, I finally got around to playing with Tomcat 5, and everything
seems to work well except for my custom tags (which is to say my whole
web app broke :) ).
My problem is when tomcat tries to process my custom tags I get an error
as follows:
org.apache.jasper.JasperException  : /index.jsp(13,0) Unknown attribute
type (String) for attribute bar.
org.apache.jasper.compiler.DefaultErrorHandler (DefaultErrorHand
ler.java:83)
org.apache.jasper.compiler.ErrorDispatcher (ErrorDispatcher.java
:402)
*SNIP*
Anyone have an idea as to what might be wrong? Keep in mind, everything
worked fine with Tomcat 4.x. The only thing I can think of is that
perhaps this has something to do with TEI classes (which I have never
bothered with before)? In the mean time I think I'll start slogging
through the JSP 2.0 spec, but if anyone can prevent me from thinking for
myself that would be appreciated :).
Thanks in Advance,
Richard Wareing
Reimer Technology Group
P.S. Here is a simple test case which demonstrates the problem (I have
it in a nice zip file with the directory structure if anyone wants it):
FooTag simply prints out the contents of a variable "bar" when it is
passed along, otherwise prints out a default message of "Nothing set!":
/index.jsp:
================START===============
<%@(protected) contentType="text/html"%>
<%@ taglib uri="/taglibs/testcase.tld" prefix="forminputs" %>
<html>
<head><title>Tomcat 5 Testcase</title></head>
<body>
<%-- <jsp:useBean id="beanInstanceName" scope="session"
class="package.class" /> --%>
<%-- <jsp:getProperty name="beanInstanceName" property="propertyName"
/> --%>
<forminputs:fooTag bar='<%= "Hope this works!" %>' >
<h1> <%= outputString %> </h1>
</forminputs:fooTag>
</body>
</html>
================END===============
/taglibs/testcase.tld:
================START===============
<?xml version="1.0" encoding="UTF-8 (See http://UTF-8.ora-code.com)" ?>
<!DOCTYPE taglib
PUBLIC "-//Sun Microsystems, Inc.//DTD JSP Tag Library 1.2//EN"
"http://java.sun.com/dtd/web-jsptaglibrary_1_2.dtd">
<taglib>
<tlib-version>1.0</tlib-version>
<jsp-version>1.2</jsp-version>
<short-name>testcase</short-name>
<uri>/testcase</uri>
<display-name>testcase</display-name>
<description>A blank tag library template.
</description>
<tag>
<name>fooTag</name>
<tag-class>tomcat5.testcase.FooTag</tag-class>
<body-content>JSP</body-content>
<small-icon></small-icon>
<large-icon></large-icon>
<description></description>
<!-- Forte4J_TLDX: This comment contains code generation
information. Do not delete.
<tldx>
<packagename>tomcat5.testcase</packagename>
<extendsSupportClass>TRUE</extendsSupportClass>
<supportClass>BodyTagSupport</supportClass>
<implementsTryCatchFinally>FALSE</implementsTryCatchFinally>
<findparent>FALSE</findparent>
<parenttype></parenttype>
<parentvariable></parentvariable>
</tldx>
-->
<variable>
<name-given>outputString</name-given>
<variable-class>String</variable-class>
<declare>true</declare>
<scope>NESTED</scope>
<!-- Forte4J_TLDX: This comment contains code generation information.
Do not delete.
<tldx>
<name>outputString</name> </tldx>
-->
</variable>
<attribute>
<name>bar</name>
<required>false</required>
<rtexprvalue>true</rtexprvalue>
<type>String</type>
<!-- Forte4J_TLDX: This comment contains code generation
information. Do not delete.
<tldx>
<javaVariable></javaVariable>
<IsReferenceID>FALSE</IsReferenceID>
<ReferencesTag>FALSE</ReferencesTag>
<ReferenceScope>Session</ReferenceScope>
<ReferencesTagType></ReferencesTagType>
<ReferencesTagVariable></ReferencesTagVariable>
<ReferencesTagReferentFirst>TRUE</ReferencesTagReferentFirst>
</tldx>
-->
</attribute>
<example></example>
</tag>
<!-- Validators are new in JSP1.2. You may have zero or one
validator
in a tag library. They look like this:
<validator>
<validator-class>org.your.web.app.ValidateTaglibUsage</validator-class>
<init-param>
<param-name>aparameter</param-name>
<param-value>value</param-value>
<description>Describe this parameter</description>
</init-param>
</validator>
-->
<!-- listeners are new in JSP1.2. You may have as many listeners as
you like
in a tag library. They look like this:
<listener>
<listener-class>org.your.web.app.TaglibListener1</listener-class>
</listener>
-->
</taglib>
================END===============
tomcat5.testcase.FooTag Source
================START===============
package tomcat5.testcase;
import java.io.*;
import javax.servlet.*;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
import java.util.*;
/**
* Generated tag class.
*/
public class FooTag extends BodyTagSupport {
/** property declaration for tag attribute: selectedValue
*
*/
private String bar;
public FooTag() {
super();
}
public void otherDoStartTagOperations() {
}
public boolean theBodyShouldBeEvaluated() {
boolean retVal = false;
if ( bar != null ) {
setVars();
retVal = true;
}
return true;
}
public void otherDoEndTagOperations() {
}
public boolean shouldEvaluateRestOfPageAfterEndTag() {
return true;
}
public int doStartTag() throws JspException, JspException {
otherDoStartTagOperations();
if (theBodyShouldBeEvaluated()) {
return EVAL_BODY_BUFFERED;
} else {
return SKIP_BODY;
}
}
public int doEndTag() throws JspException, JspException {
otherDoEndTagOperations();
if (shouldEvaluateRestOfPageAfterEndTag()) {
return EVAL_PAGE;
} else {
return SKIP_PAGE;
}
}
public void writeTagBodyContent(JspWriter out, BodyContent
bodyContent) throws IOException {
bodyContent.writeOut(out);
bodyContent.clearBody();
}
public void handleBodyContentException(Exception ex) throws
JspException {
// Since the doAfterBody method is guarded, place exception
handing code here.
throw new JspException("error in FooTag: " + ex);
}
public int doAfterBody() throws JspException {
try {
BodyContent bodyContent = getBodyContent();
JspWriter out = bodyContent.getEnclosingWriter();
writeTagBodyContent(out, bodyContent);
} catch (Exception ex) {
handleBodyContentException(ex);
}
if (theBodyShouldBeEvaluatedAgain()) {
return EVAL_BODY_AGAIN;
} else {
return SKIP_BODY;
}
}
public boolean theBodyShouldBeEvaluatedAgain() {
return false;
}
public java.lang.String setValueOfVariable_outputString() {
String s = "Nothing set!";
if ( ( bar != null) && ( bar.length() > 0 ) )
s = bar;
return s;
}
public void setVars() {
//
// Set the name and value of the scripting variable
"optionValue"
//
{
//
// The name of this variable is fixed.
//
String nameVar = "outputString";
//
// Set the value of the variable "timeOffset" by modifying
the
// method: setValueOfVariable_timeOffset().
//
if (nameVar != null) {
java.lang.String valueObject =
setValueOfVariable_outputString();
if (valueObject != null) {
pageContext.setAttribute(nameVar, valueObject);
}
}
}
}
public String getBar() {
return bar;
}
public void setBar(String bar) {
this.bar = bar;
}
}
================END===============
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