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Tomcat example source code file (

This example Tomcat source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Tomcat tags/keywords

http, io, ioexception, ioexception, jspcontext, jspcontext, jspexception, jspfragment, jspfragment, servlet, writer, writer

The Tomcat source code

* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements.  See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License.  You may obtain a copy of the License at
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* See the License for the specific language governing permissions and
* limitations under the License.
package javax.servlet.jsp.tagext;

import javax.servlet.jsp.*;

 * Encapsulates a portion of JSP code in an object that 
 * can be invoked as many times as needed.  JSP Fragments are defined 
 * using JSP syntax as the body of a tag for an invocation to a SimpleTag 
 * handler, or as the body of a <jsp:attribute> standard action
 * specifying the value of an attribute that is declared as a fragment,
 * or to be of type JspFragment in the TLD.
 * <p>
 * The definition of the JSP fragment must only contain template 
 * text and JSP action elements.  In other words, it must not contain
 * scriptlets or scriptlet expressions.  At translation time, the 
 * container generates an implementation of the JspFragment abstract class
 * capable of executing the defined fragment.
 * <p>
 * A tag handler can invoke the fragment zero or more times, or 
 * pass it along to other tags, before returning.  To communicate values
 * to/from a JSP fragment, tag handlers store/retrieve values in 
 * the JspContext associated with the fragment.
 * <p>
 * Note that tag library developers and page authors should not generate
 * JspFragment implementations manually.
 * <p>
 * <i>Implementation Note: It is not necessary to generate a 
 * separate class for each fragment.  One possible implementation is 
 * to generate a single helper class for each page that implements 
 * JspFragment. Upon construction, a discriminator can be passed to 
 * select which fragment that instance will execute.
 * @since 2.0
public abstract class JspFragment {

     * Executes the fragment and directs all output to the given Writer,
     * or the JspWriter returned by the getOut() method of the JspContext
     * associated with the fragment if out is null.
     * @param out The Writer to output the fragment to, or null if 
     *     output should be sent to JspContext.getOut().
     * @throws javax.servlet.jsp.JspException Thrown if an error occured
     *     while invoking this fragment.
     * @throws javax.servlet.jsp.SkipPageException Thrown if the page
     *     that (either directly or indirectly) invoked the tag handler that
     *     invoked this fragment is to cease evaluation.  The container
     *     must throw this exception if a Classic Tag Handler returned
     *     Tag.SKIP_PAGE or if a Simple Tag Handler threw SkipPageException.
     * @throws If there was an error writing to the 
     *     stream.
    public abstract void invoke( Writer out )
        throws JspException, IOException;

     * Returns the JspContext that is bound to this JspFragment.
     * @return The JspContext used by this fragment at invocation time.
    public abstract JspContext getJspContext();


Other Tomcat examples (source code examples)

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