Wednesday, January 6, 2010

Migrating Firefox Profile from one computer to another

Recently, I had to get a new laptop at work since the lease on my old laptop had expired and it was acting weird. I transferred the data swiftly using this cord. But Firefox was a big deal since I stored a lot of bookmarks and passwords for some sites on the Firefox. First I tried copying the profiles folder directly but it didn't work and Firefox was giving me the message "Firefox is already running, but is not responding. To open a new window, you must first close the existing Firefox process, or restart your system." Here is how I got it working.

Lets say you want to transfer bookmarks, history, passwords from Computer A to Computer B. Firefox calls it profiles.

On Computer B, install firefox. Go to Windows Run, and type firefox -P. In the next screen click Create New profile, and give a name of your choice. Now go to (C or D drvive):\Documents and Settings\(your user id)\Application Data\Mozilla\Firefox\Profiles. Identify the profile you just created. You need to be able to see hidden folders to see this folder.

On Computer A go to the same location and the contents of your profile to a Flash drive and copy the contents. On Computer B, replace the contents of the profile folder you just created with the contents from the flash drive. Do this when Firefox is closed and you checked in Task Manager that its not running. That's all there is to it. Open firefox on Computer B and its exactly the same as Computer A with bookmarks, passwords and Master password too.

Friday, January 1, 2010

3 idiots - emphasizing the need to follow your passion

Saari umar hum mar marke jee liye,
ik pal tho ab hamein jeene dho jeene dho .....

Saari umar hum mar marke jee liye,
ik pal tho ab hamein jeene dho jeene dho .....

(All our life, we have been dead while we were alive, at least for a moment let us live, let us live..)

Give me some sunshine,
give me some rain,
Give me another chance,
I wanna grow up once again ...

The song above pretty much sums up the entire movie from a student's perspective. The pain in Joy Lobo when he just doesnt get another chance to follow up his passion and commits a suicide, haunts you long after you leave the movie theater. As Aamir puts it, Education is supposed to be about learning and growing wiser and not about cramming some lines from a textbook for an exam. In our search for riches and society-defined comfortable life, we lose the emphasis in following our passion, the passion that defines a meaning to our life. And yet, we put our children in the same path thinking about what Mr. Kapoors' and the like would think of our children if they don't become doctors or engineers. And the cycle never ends.

An excellent movie with an excellent emotional and comic mix, 3 idiots touches your heart though it takes some cinematic liberties. At the end of the day, "All izz well"

Do yourself a favor and watch it. If it doesn't make you change your lifestyle and the way of thinking, it will atleast make you think for some time about what your passion is and the meaning of life for you is. It will define the importance of following your passion which would be followed by success and not the vice-versa.

At the outset, I think it's a great move by my friend who chose to leave a society-defined great job and comfortable life style in USA to follow his passion through to India. I sincerely wish him all the very best in his endeavors...

And by the way Happy New year 2010 everyone...

Friday, December 18, 2009

Creating a routed queue between two Tibco EMS Servers with Authorization enabled

Imagine a scenario of creating a routed queue between two Tibco EMS servers A and B with home queue on B. Pretty simple right,

On server A, just define

create queue Q1@B secure, failsafe, global

Not so simple with Authorization enabled on the two servers. For messages to flow on routed queue, ServerA has to have ServerB as an authorized user to receive and ServerB has to have ServerA as an authorized user to send. So to setup the route properly with Authorization enabled the following has to be worked upon. This assumes that the route is already in place and the user ServerB is created on ServerA and the user ServerA is created on ServerB and Q1 is setup as a global queue on Server B.

Routing between two servers A and B

Q1 is on B (home queue) and we need to create a routed queue on A and send to B

On server A

create queue Q1@B secure, failsafe, global
grant queue Q1 user=ServerB receive

On Server B

grant queue Q1 user=ServerA send

Saturday, August 15, 2009

Conquering Gravity Master

Rads from Tunneling Thru posted about this game Gravity Master and I read her post on Friday evening. The game is simple yet complex in its own way but pretty interesting though. Involves Physics and common sense. Most levels were a breeze but some levels were indeed tricky. Finally I finished the game today, Saturday afternoon after spending like 2-3 hours in total. No googling, no cheating. Man, I was so happy after finishing it :) Here are the screenshots for those who are looking for proofs. I did not care about total score though since I was looking to finish the levels. If I have enough time someday, may be I will work on maximizing the scores :) Try it when you have time, its fun...


Saturday, February 14, 2009

Love or something like it...



One fine morning I saw you.
Oh God, I could not believe my eyes nor could my eyes believe me.
You saw me, approached me and gave me a gentle smile,
to give me a live canvas of Monalisa's smile.
You spoke to me, your words coming out like that of a gentle dew,
yet bringing into bloom the fairest thoughts of the world.
And then we became great friends,
You encouraged me to leave my hesitation,
You enchanted me to get my determination,
You enlightened the path from which I drew my inspiration,
You made me stand ahead of others in great position.
But by the time I came to tell you, how much
I love you, it was too late, for, you went away.
Leaving behind memories to stay.
Your memories still linger in my mind,
Your gracious picture spread over my heart,
and I put my thoughts into words to tell you
that I love you forever and ever and ever...


Tuesday, February 3, 2009

Configuring JDBC Datasource in Tomcat 5.0.28 in Eclipse WTP

I use Eclipse WTP for developing Web applications. In my previous post I mentioned that I changed the Database connection pool to use the Weblogic connection pool. The configuration in Weblogic was straightforward and simple, but it posed an issue for me during development because I was not able to configure the Datasource in the Installed Server Runtime in my Eclipse WTP. Either I had to use Reflection to supply the class and modify it between Environment deployments and local deployments or needed to fix the issue with Tomcat Datasource. The error that I was constantly getting was


ERROR DatabaseManager.getConnection - org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
org.apache.commons.dbcp.SQLNestedException: Cannot create JDBC driver of class '' for connect URL 'null'
at org.apache.commons.dbcp.BasicDataSource.createDataSource(BasicDataSource.java:780)
at org.apache.commons.dbcp.BasicDataSource.getConnection(BasicDataSource.java:540)
at com.pepsi.bdb.connections.DatabaseManager.getConnection(DatabaseManager.java:36)


Googling the error wasn't very fruitful because it mostly dealt with configuring Datasource in Tomcat directly, but not much information was available on configuring with Eclipse WTP. Also, there were several ways of configuring it mentioned in Serverside website and none seem to work for me. Finally I figured it out today and here is how I did

In Eclipse WTP, expand the configured Server under Servers, you will see a file server.xml. This is a copy of the server.xml file that Eclipse creates for you, but uses the libs from the Tomcat folder you configured. In this file add your Datasource under the tag <GlobalNamingResources> as shown below:


<GlobalNamingResources>
<Environment name="simpleValue" type="java.lang.Integer" value="30"/>
<Resource auth="Container" description="User database that can be updated and saved" name="UserDatabase" type="org.apache.catalina.UserDatabase"/>
<Resource name="myDbPool" type="javax.sql.DataSource"/>
<ResourceParams name="UserDatabase">
<parameter>
<name>factory</name>
<value>org.apache.catalina.users.MemoryUserDatabaseFactory</value>
</parameter>
<parameter>
<name>pathname</name>
<value>conf/tomcat-users.xml</value>
</parameter>
</ResourceParams>
<ResourceParams name="myDbPool">
<parameter>
<name>validationQuery</name>
<value>select * from dual</value>
</parameter>
<parameter>
<name>maxWait</name>
<value>5000</value>
</parameter>
<parameter>
<name>maxActive</name>
<value>4</value>
</parameter>
<parameter>
<name>password</name>
<value>(password)</value>
</parameter>
<parameter>
<name>url</name>
<value>jdbc:oracle:thin:@(servername):(portNum):(SID)</value>
</parameter>
<parameter>
<name>driverClassName</name>
<value>oracle.jdbc.driver.OracleDriver</value>
</parameter>
<parameter>
<name>maxIdle</name>
<value>2</value>
</parameter>
<parameter>
<name>username</name>
<value>(username)</value>
</parameter>
</ResourceParams>
</GlobalNamingResources>


Go to the folder where your server is actually located and place the jar file ojdbc14.jar (for Java 1.4, for lower versions, uses classes12.jar) in the folder %TOMCAT_HOME%\common\lib.

In the server.xml on the Eclipse, place an entry inside the <Context> element of your application that is inside the <Host> element as below:


<Context docBase="myApp" path="/myApp" reloadable="true" source="org.eclipse.jst.j2ee.server:myApp">
<ResourceLink name="myDbPool" global="myDbPool" type="javax.sql.DataSource"/>
</Context>


That is it. This did the trick for me. For the web.xml entry inside your web application and Java code, refer to my previous post.

Thursday, January 22, 2009

Configuring JDBC Datasource in Weblogic and using it in the code in a web application

I decided to leverage the Connection pooling features provided by Weblogic in one of the web applications that I wrote. This application uses plain JDBC since dome dynamic capabilities are required for sql statements and so we decided against Hibernate/Spring. Initially the code was written against Open source Snaq DB Connection pooling. Apparently, Weblogic has very good connection pooling features that an application can leverage. Since the code was object oriented and all DAO classes used a DBManager class to get their connection, all I needed to change was a method.

The Weblogic documentation shows how to configure a Data source on Weblogic but has little mention on how to get it working from your web application. The following details should help you set it up. To configure a Data source check the following Weblogic documentation.
http://edocs.bea.com/wls/docs90/jdbc_admin/jdbc_datasources.html.
In the Data source, I am assuming that you configured the JNDI name as "myAppDbPool"

In your web application, you will need a web.xml entry and an entry in a new file weblogic.xml.

The web.xml entry looks like below


<resource-ref>
<res-ref-name>myAppDbPool</res-ref-name>
<res-type>javax.sql.DataSource</res-type>
<res-auth>Container</res-auth>
</resource-ref>


If you don't have a weblogic.xml file in your app create one. It goes in your WEB-INF beside web.xml file. The weblogic.xml file looks like below

<!DOCTYPE weblogic-web-app PUBLIC "-//BEA Systems, Inc.//DTD Web Application 8.1//EN"

"http://www.bea.com/servers/wls810/dtd/weblogic810-web-jar.dtd">

<weblogic-web-app>

<reference-descriptor>
<resource-description>
<res-ref-name>myAppDbPool</res-ref-name>
<jndi-name>myAppDbPool</jndi-name>
</resource-description>
</reference-descriptor>

</weblogic-web-app>


That's the configuration part. Now all you need to do is code your web application to retreive the Database connection from this Datasource. I made the DBManager class singleton to make sure only one instance runs at a given time. The DBManager class method looks like below:

public Connection getConnection() throws Exception
{
InitialContext ctx=new InitialContext();
DataSource ds=(DataSource)ctx.lookup("java:comp/env/myAppDbPool");
Connection connection=ds.getConnection();
return connection;
}


That's it. Use this connection in your DAO and you are all set. But make sure that your DAO object calls connection.close() when it is done accessing the data. According to Weblogic documentation, this returns the connection to the pool for other objects to access it.

If you have better approach or you see any flaws in this, let me know in the comments.

Tuesday, January 20, 2009

Stay Hungry Stay Foolish

A man single-handedly builds an empire out of his vision, a cult following among generations, and as he fights off his personal health problems, a multi-billion dollar company, the shareholders and the whole tech world are eagerly awaiting just the signal that he is fine and we can expect more wonders from this genius. Thats Steve Jobs, the man who brought Apple back to an industry leading giant, a man who never ceases to amaze the world with his unconventional outlook. The speech that he delivered in Stanford is just marvelous, as it continues to inspire me all the time.




Steve Jobs, 2005 Stanford Commencement Address :This is the prepared text of the address by Steve Jobs, CEO of Apple Computer and of Pixar Animation Studios, who spoke at Commencement on June 12, 2005.

I am honored to be with you today at your commencement from one of the finest universities in the world. I never graduated from college. Truth be told, this is the closest I've ever gotten to a college graduation.

Today I want to tell you three stories from my life. That's it. No big deal. Just three stories.

The first story is about connecting the dots.

I dropped out of Reed College after the first 6 months, but then stayed around as a drop-in for another 18 months or so before I really quit. So why did I drop out?

It started before I was born. My biological mother was a young, unwed college graduate student, and she decided to put me up for adoption. She felt very strongly that I should be adopted by college graduates, so everything was all set for me to be adopted at birth by a lawyer and his wife. Except that when I popped out they decided at the last minute that they really wanted a girl. So my parents, who were on a waiting list, got a call in the middle of the night asking: "We have an unexpected baby boy; do you want him?" They said: "Of course."

My biological mother later found out that my mother had never graduated from college and that my father had never graduated from high school. She refused to sign the final adoption papers. She only relented a few months later when my parents promised that I would someday go to college. And 17 years later I did go to college.

But I naively chose a college that was almost as expensive as Stanford, and all of my working-class parents' savings were being spent on my college tuition. After six months, I couldn't see the value in it. I had no idea what I wanted to do with my life and no idea how college was going to help me figure it out. And here I was spending all of the money my parents had saved their entire life. So I decided to drop out and trust that it would all work out OK.

It was pretty scary at the time, but looking back it was one of the best decisions I ever made. The minute I dropped out I could stop taking the required classes that didn't interest me, and begin dropping in on the ones that looked interesting. It wasn't all romantic. I didn't have a dorm room, so I slept on the floor in friends' rooms, I returned coke bottles for the 5¢ deposits to buy food with, and I would walk the 7 miles across town every Sunday night to get one good meal a week at the Hare Krishna temple. I loved it.

And much of what I stumbled into by following my curiosity and intuition turned out to be priceless later on. Let me give you one example: Reed College at that time offered perhaps the best calligraphy instruction in the country. Throughout the campus every poster, every label on every drawer, was beautifully hand calligraphed. Because I had dropped out and didn't have to take the normal classes, I decided to take a calligraphy class to learn how to do this. I learned about serif and san serif typefaces, about varying the amount of space between different letter combinations, about what makes great typography great. It was beautiful, historical, artistically subtle in a way that science can't capture, and I found it fascinating.

None of this had even a hope of any practical application in my life. But ten years later, when we were designing the first Macintosh computer, it all came back to me. And we designed it all into the Mac. It was the first computer with beautiful typography. If I had never dropped in on that single course in college, the Mac would have never had multiple typefaces or proportionally spaced fonts. And since Windows just copied the Mac, its likely that no personal computer would have them. If I had never dropped out, I would have never dropped in on this calligraphy class, and personal computers might not have the wonderful typography that they do. Of course it was impossible to connect the dots looking forward when I was in college.

But it was very, very clear looking backwards ten years later. Again, you can't connect the dots looking forward; you can only connect them looking backwards. So you have to trust that the dots will somehow connect in your future. You have to trust in something - your gut, destiny, life, karma, whatever. This approach has never let me down, and it has made all the difference in my life.

My second story is about love and loss.

I was lucky - I found what I loved to do early in life. Woz and I started Apple in my parents garage when I was 20. We worked hard, and in 10 years Apple had grown from just the two of us in a garage into a $2 billion company with over 4000 employees. We had just released our finest creation - the Macintosh - a year earlier, and I had just turned 30.

And then I got fired. How can you get fired from a company you started? Well, as Apple grew we hired someone who I thought was very talented to run the company with me, and for the first year or so things went well. But then our visions of the future began to diverge and eventually we had a falling out. When we did, our Board of Directors sided with him. So at 30 I was out. And very publicly out. What had been the focus of my entire adult life was gone, and it was devastating.

I really didn't know what to do for a few months. I felt that I had let the previous generation of entrepreneurs down - that I had dropped the baton as it was being passed to me. I met with David Packard and Bob Noyce and tried to apologize for screwing up so badly. I was a very public failure, and I even thought about running away from the valley. But something slowly began to dawn on me - I still loved what I did. The turn of events at Apple had not changed that one bit. I had been rejected, but I was still in love. And so I decided to start over. I didn't see it then, but it turned out that getting fired from Apple was the best thing that could have ever happened to me. The heaviness of being successful was replaced by the lightness of being a beginner again, less sure about everything.

It freed me to enter one of the most creative periods of my life. During the next five years, I started a company named NeXT, another company named Pixar, and fell in love with an amazing woman who would become my wife. Pixar went on to create the worlds first computer animated feature film, Toy Story, and is now the most successful animation studio in the world. In a remarkable turn of events, Apple bought NeXT, I retuned to Apple, and the technology we developed at NeXT is at the heart of Apple's current renaissance. And Laurene and I have a wonderful family together. I'm pretty sure none of this would have happened if I hadn't been fired from Apple.

It was awful tasting medicine, but I guess the patient needed it. Sometimes life hits you in the head with a brick. Don't lose faith. I'm convinced that the only thing that kept me going was that I loved what I did. You've got to find what you love. And that is as true for your work as it is for your lovers. Your work is going to fill a large part of your life, and the only way to be truly satisfied is to do what you believe is great work. And the only way to do great work is to love what you do. If you haven't found it yet, keep looking. Don't settle. As with all matters of the heart, you'll know when you find it. And, like any great relationship, it just gets better and better as the years roll on. So keep looking until you find it. Don't settle.

My third story is about death.

When I was 17, I read a quote that went something like: "If you live each day as if it was your last, someday you'll most certainly be right." It made an impression on me, and since then, for the past 33 years, I have looked in the mirror every morning and asked myself: "If today were the last day of my life, would I want to do what I am about to do today?" And whenever the answer has been "No" for too many days in a row, I know I need to change something.

Remembering that I'll be dead soon is the most important tool I've ever encountered to help me make the big choices in life. Because almost everything - all external expectations, all pride, all fear of embarrassment or failure - these things just fall away in the face of death, leaving only what is truly important. Remembering that your are going to die is the best way I know to avoid the trap of thinking you have something to lose. You are already naked. There is no reason not to follow your heart.

About a year ago I was diagnosed with cancer. I had a scan at 7:30 in the morning, and it clearly showed a tumor on my pancreas. I didn't even know what a pancreas was. The doctors told me this was almost certainly a type of cancer that is incurable, and that I should expect to live no longer than three to six months. My doctor advised me to go home and get my affairs in order, which is doctor's code for prepare to die. It means to try to tell your kids everything you thought you'd have the next 10 years to tell them in just a few months. It means to make sure very thing is buttoned up so that it will be as easy as possible for your family. It means to say your goodbyes. I lived with that diagnosis all day.

Later that evening I had a biopsy, where they stuck an endoscope down my throat, through my stomach and into my intestines, put a needle into my pancreas and got a few cells from the tumor. I was sedated, but my wife, who was there, told me that when they viewed the cells under a microscope the doctors started crying because it turned out to be a very rare form of pancreatic cancer that is curable with surgery. I had the surgery and I'm fine now. This was the closest I've been to facing death, and I hope it's the closest I get for a few more decades. Having lived through it, I can now say this to you with a bit more certainty than when death was a useful but purely intellectual concept:

No one wants to die. Even people who want to go to heaven don't want to die to get there. And yet death is the destination we all share. No one has ever escaped it. And that is as it should be, because Death is very likely the single best invention of Life. It is Life's change agent. It clears out the old to make way for the new. Right now the new is you, but someday not too long from now, you will gradually become the old and be cleared away. Sorry to be so dramatic, but it is quite true. Your time is limited, so don't waste it living someone else's life.

Don't be trapped by dogma - which is living with the results of other people's thinking. Don't let the noise of other's opinions drown out your own inner voice. And most important, have the courage to follow your heart and intuition. They somehow already know what you truly want to become. Everything else is secondary.

When I was young, there was an amazing publication called The Whole Earth Catalog, which was one of the bibles of my generation. It was created by a fellow named Stewart Brand not far from here in Menlo Park, and he brought it to life with his poetic touch. This was in the late 1960's, before personal computers and desktop publishing, so it was all made with typewriters, scissors, and Polaroid cameras.

It was sort of like Google in paperback form, 35 years before Google came along: it was idealistic, and overflowing with neat tools and great notions. Stewart and his team put out several issues of The Whole Earth Catalog, and then when it had run its course, they put out a final issue. It was the mid-1970s, and I was your age. On the back cover of their final issue was a photograph of an early morning country road, the kind you might find yourself hitchhiking on if you were so adventurous. Beneath it were the words:

"Stay Hungry. Stay Foolish." It was their farewell message as they signed off. Stay Hungry. Stay Foolish. And I have always wished that for myself. And now, as you graduate to begin anew, I wish that for you.

Friday, January 9, 2009

Errors when using Struts 1.3.x that are not intuitive javax.servlet.ServletException: org/apache/commons/lang/UnhandledException

Today, I decided to upgrade a new application that I was working on to Struts 1.3.10. After getting the necessary jars and stuff from the struts-blank.war, and upgrading my webapp library with those, everything was fine until I ran into this error. Apparently, Struts 1.3.x removed some jars from the distribution, and the dependecies had to be resolved externally. The error gave me no clue that it was unable to find the commons-lang.jar. After struggling with it for sometime, I finally figured out that the commons-lang.jar was the missing jar. Usually when a jar is missing we get a NoClassDefFoundError that points in the right way, but the error trace for this gave no clue at all. Anyways if you happen to run into this error the key is to have the commons-lang.jar in your classpath from this location Apache Commons


2009-01-09 17:30:34,001 ERROR InsertTag$InsertHandler.doEndTag - ServletException in '/pages-bdb/batchListDetail.jsp': org/apache/commons/lang/UnhandledException
javax.servlet.ServletException: org/apache/commons/lang/UnhandledException
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:244)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:704)
at org.apache.catalina.core.ApplicationDispatcher.doInclude(ApplicationDispatcher.java:590)
at org.apache.catalina.core.ApplicationDispatcher.include(ApplicationDispatcher.java:510)
at org.apache.jasper.runtime.JspRuntimeLibrary.include(JspRuntimeLibrary.java:966)
at org.apache.jasper.runtime.PageContextImpl.doInclude(PageContextImpl.java:610)
at org.apache.jasper.runtime.PageContextImpl.include(PageContextImpl.java:604)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.apache.struts.tiles.TilesUtilImpl.doInclude(TilesUtilImpl.java:129)
at org.apache.struts.tiles.TilesUtil.doInclude(TilesUtil.java:152)
at org.apache.struts.tiles.taglib.InsertTag.doInclude(InsertTag.java:764)
at org.apache.struts.tiles.taglib.InsertTag$InsertHandler.doEndTag(InsertTag.java:896)
at org.apache.struts.tiles.taglib.InsertTag.doEndTag(InsertTag.java:465)
at org.apache.jsp.pages.shared.template_jsp._jspx_meth_tiles_insert_2(template_jsp.java:173)
at org.apache.jsp.pages.shared.template_jsp._jspService(template_jsp.java:92)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:94)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:324)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:292)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:236)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:704)
at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:474)
at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:409)
at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:312)
at org.apache.struts.action.RequestProcessor.doForward(RequestProcessor.java:1083)
at org.apache.struts.tiles.TilesRequestProcessor.doForward(TilesRequestProcessor.java:295)
at org.apache.struts.tiles.TilesRequestProcessor.processTilesDefinition(TilesRequestProcessor.java:271)
at org.apache.struts.tiles.TilesRequestProcessor.processForwardConfig(TilesRequestProcessor.java:332)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:232)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:237)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:157)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:214)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:198)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:152)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:137)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:118)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:102)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValveContext.java:104)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:520)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:929)
at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:160)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:799)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:705)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java:577)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:683)
at java.lang.Thread.run(Thread.java:534)

Wednesday, December 31, 2008

The Best Things in Life are always Free

Well, probably they are always not. But these days, information is. If you truly have the passion and drive to learn something, then the opportunities today are wide ranged thanks to Internet.

MIT Open courseware gives everyone an opportunity to experience the standard of its courses from previous semesters. Some of them might be outdated with respect to changes in technology but many core courses are usually not. Here is a link to MIT Open Courseware

Other universities offering free online courses that I have come across are below:

Carnegie Melon
Stanford
Tufts
UC Berkley
Utah State University OpenCourseWare
Johns Hopkins OCW
Notre Dame
Yale

To find courses available from several countries, use Open course ware consortium

If you are interested in a specific course use OCWFinder to find all the options that you have. Good luck.