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Process JSP Stream explicitly  RSS feed

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I have a server side component which generates the HTML stream and throws back to the client through PrintWriter type or ServletOutputStream type object. I have introduced few custom tags in the same stream instead of HTML controls (<input> and so on). So I need to process the custom tags before they could be thrown back to the client. Is there anyway I can access the JSP engine or execute the custom tag handler class and embedded result into HTML stream?
Here are the code snippets for both scenarios.

1.Before introducing custom tags:

The HTML stream generated dynamically on server side.

This HTML stream can be directly written to out object from a web component i.e. either servlet or JSP.

2.After introducing the custom tags:

The HTML + Custom Tags stream generated dynamically on the server side.

In this case <myTagLibrary:input> custom tag extracts the value for the input element from a java bean and throws back the HTML equivalent along with the value attribute appended.

But this JSP stream I cann�t write to �out� object since they will not be processed. Hence is there any way I can access the JSP Engine or Tag Handler or some other server side service component which takes this HTML + Custom Tag stream and process the custom tags and return the pure HTML stream to the client.

Note: Custom tags are already built in the system and i want to re-use the custom tags.

Thanks for the time.
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