Comment
Greg
your class had errors,
February 5, 2009 at 11:55 PM
February 5, 2009 at 11:55 PM
I cleaned up your code. It had multiple errors with return types, misspelled variables and classes, and illegal characters.
This compiles correctly:
package mytags;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
public class Helloworld implements Tag {
private PageContext pagecontext;
private Tag parent;
public int doStartTag() throws JspException
{
return SKIP_BODY;
}
public int doEndTag () throws JspException
{
try {
pagecontext.getOut().write("Hello World");
}
catch(java.io.IOException ex)
{
throw new JspException("IO Exception");
}
return EVAL_PAGE;
}
public void release (){}
public void setPageContext(PageContext p)
{
pagecontext=p;
}
public void setParent(Tag t)
{
parent = t;
}
public Tag getParent()
{
return parent;
}
}
Since this is the first taglib tutorial I've ever tried, it was frustrating. It took me many hours to find out why.
The problem is in your class.
First of all, "Package" is lowercase. "Import" is also all lowercase. "Public" is also all lowercase.
"PageContext" needs to have capital "P" and "C", not just capital "P".
The property "pagecontext" doesn't have a capital "C".
The "JSPException" is also misspelled. It should be "JspException."
In the try/catch, "java.io.Exception" should be "java.io.IOException" - there is no "Exception"...it doesn't exist.
In your setPageContext() method, the data type of variable p is PageContext, not pageContext.
In your getParent() method, you have "void" for return type. It should be "Tag" instead of void.
Even though your code is horrible, I learned a lot by fixing it.
Sir, you can't just put tutorials like this online without testing the code for yourself!
There are a lot of beginners who need good tutorials. They need help, not confusion.
View All Comments | View Tutorial
This compiles correctly:
package mytags;
import javax.servlet.jsp.*;
import javax.servlet.jsp.tagext.*;
public class Helloworld implements Tag {
private PageContext pagecontext;
private Tag parent;
public int doStartTag() throws JspException
{
return SKIP_BODY;
}
public int doEndTag () throws JspException
{
try {
pagecontext.getOut().write("Hello World");
}
catch(java.io.IOException ex)
{
throw new JspException("IO Exception");
}
return EVAL_PAGE;
}
public void release (){}
public void setPageContext(PageContext p)
{
pagecontext=p;
}
public void setParent(Tag t)
{
parent = t;
}
public Tag getParent()
{
return parent;
}
}
Since this is the first taglib tutorial I've ever tried, it was frustrating. It took me many hours to find out why.
The problem is in your class.
First of all, "Package" is lowercase. "Import" is also all lowercase. "Public" is also all lowercase.
"PageContext" needs to have capital "P" and "C", not just capital "P".
The property "pagecontext" doesn't have a capital "C".
The "JSPException" is also misspelled. It should be "JspException."
In the try/catch, "java.io.Exception" should be "java.io.IOException" - there is no "Exception"...it doesn't exist.
In your setPageContext() method, the data type of variable p is PageContext, not pageContext.
In your getParent() method, you have "void" for return type. It should be "Tag" instead of void.
Even though your code is horrible, I learned a lot by fixing it.
Sir, you can't just put tutorials like this online without testing the code for yourself!
There are a lot of beginners who need good tutorials. They need help, not confusion.
View All Comments | View Tutorial
Related Tutorial and Articles
If you are facing any programming issue, such as compilation errors or not able to find the code you are looking for.
Ask your questions, our development team will try to give answers to your questions.
Tutorial Topics
