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How to add help menu with cabalility of some features in a java app

I want to add help menu which have to include some features such as search ability, tree structure in a java application but i dont know how can I do. I searched about the topic and I found a microsoft html help workshop. As I understand, need to create .chm file with compiling .html files. After compilation, microsoft html help viewer is need to be run from java program with compiled html files when user click the help button. Is there a any different solution or does java has a library about help authoring. In short, I created a template in my head, but I do not know that I have enough information. I would also appreciate it if you could post any documentation that might be useful on this subject.

HTMLHelp (HH) also known as Compiled Help Modules (.chm) is about 20 years old but available and running on Windows 10. HTMLHelp is in "maintenance mode" for several years now.
You can spend a lot of money on "bells and whistles" tools that simplify and streamline the process of creating help files. Before you do so, it is worth trying out a few freeware tools.
Some thoughts:
CHM's are good for application help on Windows.
Please note - more and more content is web-based.
Help authoring has a learn curve and good help topics are time consuming.
Think about single-sourcing - one source of topics and different target formats (e.g. CHM, web-based (uncompressed help) on a server).
You should gain some experience with a workflow like e.g. Markdown -> Pandoc -> HTML files.
By the way, HTML Help Workshop (HHW) is the tool for compiling CHM's. For beginners the GUI of HHW is somewhat difficult. Use a time saver tool like FAR HTML (Freeware).
Please have a look at an old thread Code Project for some code snippets like:
Runtime.getRuntime().exec("hh.exe myhelpfile.chm");
Have a look at some samples for web-based (uncompressed) help:
Example 1: Uncompressed help - a bit dated
Example 2: FAR Web help created using FAR HTML.

Parsing C and Java for displaying code on my website

I have hosted my web-application on google appengine. I had to put up some java code on my website.So I am looking for a java parser for the website. Please suggest some.
Actually I wanted to put up a project that used C and Java so I am looking for a parser that can parse both the languages.Are there available parser or I will have to write my own ?
Edit : My sole purpose 'now' is code highlighting

If you just need code highlighting, there are tons of stuff out there. You could, for instance, use highlight.js, or even Google's own code prettifier.
At this moment, that is what I can get from your question, so until further clarification, I won't be able to give a more precise answer.

Where is valid RSS changes of OpenJDK projects?

I wanted to be notified about last changes of JDK's project through RSS, for example lambda project. http://hg.openjdk.java.net/lambda/lambda/jdk/rss-log seems is not a valid RSS output, so where is valid RSS of OpenJDK projects?

Let me guess. Are you using the Chrome browser? It is picky about RSS conformance ...
I suggest you switch Firefox for now to read this RSS feed. Firefox displays it just fine for me. And if it really bugs you, see if you can figure out what the problem with this feed is and report it to the site maintainers.
To answer your question: I don't know if there is another RSS feed, but I rather doubt not.

2012: Seems there is some bug on OpenJDK Mercurial rss feed output.
2021 update: Apparently is fixed now, http://hg.openjdk.java.net/lambda/lambda/jdk/rss-log although I used to check it with Google Reader which is gone since 2013!

1-D barcode scanner(using images from a capturing device) implementation in java

I am a student and as a project i have to implement a barcode(1-D) based attendance marking system.While surfing across the web i came to know that barcode readers are a bit costly toys to purchase,so now what I want to do is I want to capture images of barcodes through a capturing device(mostly a webcam) and then process them to get the content stored in it.
I found a few projects on the internet that do the same but they use .NET f/w and I am not so familiar with .NET technology. The only project that uses java is http://sourceforge.net/projects/javabarcoderead/ but somehow i am not able to run the jar file they are providing.
SO, I would like to know about the algorithms or methods that can be used for the same or even any project from where i can get some insight on how to move further with this...
Happy Coding...

You're right, it would be very difficult to use a library with no documentation and no source code.
I'd suggest using ZXing. It's a well-documented library with lots of examples.

(Vocal code) Need some help finding text-to-speech addon

I am looking for an addon that can say characters vocally. It is for non-commercial use, and it would be nice if it can vocalize more languages, like asian, english etc...
I have googled it, but can't seem to find anything for free use.
Update: This is for web use

You could try http://espeak.sourceforge.net/ and make an mp3 of the word, then stream it to a flash application (you could use darwin for the streaming).

You can convert the text to speech in Java using freetts1.2 API. It is quite simple to use. This link could be useful for you which has an example program.
http://learnsharelive.blogspot.com/2011/01/convert-text-to-speech-java-freetts12.html

What yo uare searching for ist Sphinx4. Some free speech models for other languages can be found here.

A similar question has been asked regarding Java Text-to-Speech engines. Take a look at the question Java: Text to Speech engines overviewand see if any of the responses are helpful.

It's unlikely that you'll find an Actionscript 2.0 or 3.0 text to speech codebase, as sound synthesis is only just being introduced in the upcoming Flash Player version 10.
Java however has many, try this, this, or even that!