public int doEndTag() throws JspException 
{
        try {
            return super.doEndTag();
        } finally {
            endContext(pageContext);
        }
}

{@inheritDoc}

 public int doStartTag() throws JspException 
{
                                                    
        container = TilesAccess.getContainer(pageContext.getServletContext());
        if (container != null) {
            startContext(pageContext);
            return EVAL_BODY_BUFFERED;
        } else {
            throw new JspException("TilesContainer not initialized");
        }
}

By default, all ContainerTags evaluate their body. Subclasses may choose to be more selective. In any case, children can rely upon the container and attributeContext being initialized if they call super.doStartTag()

 protected  void endContext(PageContext context) 
{
        if (attributeContext != null && container != null) {
            container.endContext(pageContext);
        }
}

Ends the context when exiting the tag.

 public  void release() 
{
        super.release();
        this.container = null;
        this.attributeContext = null;
}

{@inheritDoc}

 protected  void startContext(PageContext context) 
{
        if (container != null) {
            attributeContext = container.startContext(pageContext);
        }
}

Starts the context when entering the tag.