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I wanted to ask for some advice.
I am kind of at a standstill - split between just stopping whatever it is I am learning or continuing to dig through it.
Introduction
First of all let me tell you about my programming skills. I've come from university where we did only a tiny bit of "real" java programming. Most of it was exercises.
For my first and second jobs I've used mostly python + django which I still use at every opportunity.
However, at my current job - I use a lot of java. Now - coming back to it after 5 years, I find a lot of good things about it. I really like the pure interfaces, generics, enum classes, Collections and more.
But I find it hard to figure out which technologies I should learn. Or which are worth learning.
So now comes my problem.
Recently (about 1 month ago) - I stumbled onto OSGI spec, and some presentations about it. I became really interested in it. Conceptually it sounds great. There is just something elegant about it that I can't explain. I've read the first version R1 Spec - and I must say I actually liked it. I mean - I have never read a spec for anything before, but this one I actually understood.
When I started looking for an implementation of OSGI - I found multiple ones out there. I've read the OSGI Equinox book - but found it way to complicated, bogged down in Eclipse-specific details and very hurried towards the end.
Then I came across the wonderful free book by Neil Bartlett called OSGI in Practice - which I am almost done reading. I must say it is a gem. It backs away from Eclipse-specific way of explaining things and teaches you things incrementally.
Questions
Ok, after explaining all that my question is "What next"?
I mean should I proceed with development using Equinox or Felix OSGI implementations or look for some kind of framework built on top of these implementations?
I have started looking at Spring Source DM (or tc? I am confused by their naming). Spring Source docs say that I should stay away from pure OSGI - as it is too complicated, so I can make to many mistakes and also Spring Source dm is better.
However after being shocked by the sheer amount of download size, it's own server, maven requirement and configurations that I had to install - I quickly changed my mind about Srping Source. I mean I like the concept of OSGI but spring source seems to be a beast of it's own.
In python when I want to create a web-app, I just start coding. All it takes is some python libraries, django and a local database. How hard is it to start developing with OSGI? Can you just sit and write a fully functioning web-app in 2 days?
Or will they be spent on downloading huge requirements?
I am at a point where I am not sure if OSGI is what I thought it would be. Is it really an alternative way of developing all kinds of Java applications, or just something that needs weeks of setup and planning and is only used by big companies?
Do i keep learning it - or accept my failure! Haha.
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OSGI is good for the big deals. There are multiple of those frameworks out there, try to stick to one, use it - and know it!
On small applications I intend to use a simple MVC.
regards
Torsten
I never finish anyth...
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hi friends, currently one of my clients asked me to put an wake up alarm in my web application, so i had successfully putted an applet in my app which works fine with one task i.e. one single call, but my problem is that i have never done scheduling before and hence i have no idea how to solve this problem for a synchronized multiple tasks.
i.e. different times as on 9 pm then 11 pm then 12 pm and so on........ i am currently reading and going through the util.timer system so please dont give any beginner reference to that please.
Regards
Alok sharma
Change of the world happens from within
modified on Tuesday, December 21, 2010 5:04 AM
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no thanks, i do not need tasks.
I'm currently working on an map based application. Some other programmer (definitely no developer...) didn't validate textfields. Now there is a pretty good chance to ultimately crash the app by entering wired stuff  
regards,
Torsten
I never finish anyth...
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wat about an alarm clock to ring on different given times, will you go with map then???
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 so this was supposed to be a question?
I would simply use java.util.calendar and compare that one to the actual date, which is given by creating a new, argument free Instance of the calendar object. Setting a timer would be easy as I can add or subtract time in a quit simple way.
Certainly the input of the user needs to be validated, as there is a certain range of valid time inputs. I would leave that one to my custom calendar object.
As there is no real DateChooser component or dialog I would certainly go with this one: clickedy.
If the date is set as a simple textfield, I would definitely give the user a hint of how to set the date, as there are different forms used depending on which localization the user has.
And I would validate the date, which is a bit tricky, because some month do have 30, other do have 31 days and some do have a changing number of days depending on whether it is a leap-year or not.
It would be cool to handle this with try/catch and a custom "DateFormException".
Also would it be cool to have a scaling GUI with a growing window when the number of timers exceeds the given space in the GUI. Of course would the window just rise to a certain size, as a monitor just has a certain size (variating too!).
If the window is minimized, i would push it to the tasks aside the clock. Of course would I prevent the app to be closed before all times have finished.
And I would play a sound and push a popup when a timer finishes.
And when I finish my homework I would be proud as hell to have done it all by myself 
regards,
Torsten
I never finish anyth...
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hello, currently using netbeans and java. I figure it out to add data on the web however after adding the new data, the data isn't being added to the database. needing help..
i refer to this as a reference : http://netbeans.org/kb/65/web/inserts-updates-deletes.html#01d[^]
modified on Wednesday, December 15, 2010 11:22 PM
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pancakeleh wrote: I figure it out to add data on the web however after adding the new data, the data isn't being added to the database
Please Mention your Code in your Question because of this we can easily analyze what is problem whatever ,
You Should Navigate the Given link to get concept of how to Work with DB
Working With DB[^]
Hope it Will works for you 
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i have this table which i am able to add values in however unable to add it to the database. how do i use the table to input data into database?
my add button are as follows:
public String add_action() {<br />
try {<br />
RowKey rk = instancedataDataProvider.appendRow();<br />
instancedataDataProvider.setCursorRow(rk);<br />
<br />
instancedataDataProvider.setValue("INSTANCEDATA.INSTANCEID", new Integer(0));<br />
instancedataDataProvider.setValue("INSTANCEDATA.INSTANCEDATA", new Integer(1));<br />
<br />
instancedataDataProvider.commitChanges();<br />
instancedataDataProvider.refresh();<br />
<br />
} catch (Exception ex) {<br />
log("Error Description", ex);<br />
error(ex.getMessage());<br />
}<br />
return null;<br />
<br />
}
my save button as follows:
<br />
public String save_action() {<br />
<br />
try {<br />
<br />
CachedRowSetDataProvider maxInstance = getSessionBean1().getmaxinstancedataDataProvider();<br />
maxInstance.refresh();<br />
maxInstance.cursorFirst();<br />
long newInstanceId = ((Long) maxInstance.getValue("MAXINSTANCEID"));<br />
<br />
<br />
if (instancedataDataProvider.getRowCount() > 0) {<br />
instancedataDataProvider.cursorFirst();<br />
do {<br />
if (instancedataDataProvider.getValue("INSTANCEDATA.INSTANCEID").equals<br />
(new Long(0))) {<br />
instancedataDataProvider.setValue("INSTANCEDATA.INSTANCEID",<br />
new Long(newInstanceId));<br />
newInstanceId++;<br />
}<br />
<br />
} while (instancedataDataProvider.cursorNext());<br />
}<br />
instancedataDataProvider.commitChanges();<br />
<br />
<br />
} catch (Exception ex) {<br />
log("Error Description", ex);<br />
error("Error :"+ex.getMessage());<br />
}<br />
<br />
modified on Thursday, December 16, 2010 2:02 AM
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When you say you are "unable to add", what do you mean? Do you get an exception? Does it fail to compile? Does nothing happen at all? Does it insert the wrong value?
One thing I notice is that your code is different from the NetBeans tutorial. In your code, you are committing the changes in the add_action method. In the NetBeans tutorial, they do not do that. They update the local data set in add_action but do not commit back to the database until the save_action call. In add_action you do not have a unique id allocated so I can guess that might give you problems.
As an aside, the NetBeans tutorial is a bit of a clumsy example of how to write database applications. It's not really very well architected.
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oh i modify the code to suit my program, that is why it look different from the tutorial. oh any good database application to share?
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pancakeleh wrote: oh any good database application to share?
Of-course move to Google there are lots of database application. whatever, this Link[^] may help you.
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thank you i managed to figure it out
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is this a oracle database??
why are you dealing with the cursor? I never used Oracle DB, but this seems strange to me
Your task is just about fetching data from an table and pushing it into the database?
Is the data to be modified in the table?
regards,
Torsten
I never finish anyth...
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Hello, I am currently using netbeans and glassfish for my project as i am very new to java programming as well as netbeans, i came across this particular problem which is to display, edit, delete and update the database. I am now able to display the datas from the database in a table on a web jsp file. Right now not sure of how to edit and delete the data in the table and update the database. needing help.
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I could not resist
EDIT: Who expected that? Google did give another, better result. Do they manipulate search results Click me hard
regards,
Torsten
I never finish anyth...
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how to read next page of the same URL
the URL of the page contain many pages i read the first page using
URL(url).openStream()
but it just reading the first page
for example this site i read the first page how can i read the second culture.gov.uk/news/news_stories/6832.aspx
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You could set up a wired script, forcing the Server to hand over all it's pages - or the script cuts off the power!
Or you use the weblinks to retrieve the data like the rest of us would do (well - most of us...). Weblinks start with "< a ...>" and do end with "".
regards,
Torsten
I never finish anyth...
modified on Wednesday, December 15, 2010 2:30 AM
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damn - I can't think of a single webpage explaining how a HTML Link looks like... 
Where is the problem?
Don't you know how to program in general?
Or are you just a student trying to get a non regular homework done without invest?
regards,
Torsten
I never finish anyth...
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i am not asking about the links the page use java scripts so i want to ask about handling the Java script i my program to go to next page the JavaScript is as the following
a href="javascript: __doPostBack('ctl00$PlaceHolderMain$g_781eb52f_faa9_4d59_9cae_2baec06ac484','dvt_firstrow={11};dvt_startposition={Paged=TRUE&p_Created_x0020_Date=11%2f10%2f2009%206%3a06%3a47%20AM&p_ID=257}');"><img border="0" alt="Next" src="/_layouts/images/next.gif"></a>
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This is a JS command. On clicking that link, there is some action to be done. __doPostBack(args) seems to be a command from some Web2.0-Page. Where is it from? Facebook? Twitter?
A CMS should always send plain text-links like posted/linked before.
These are links you can observe.
regards,
Torsten
I never finish anyth...
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actually i want to extract all the links from web page but the page contain many pages using Java script with the same URL i try to use HtmlUnit but it give me error
the link is from university web site
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You can extract links to pages - not some wired submit-actions.
Have you checked Davids suggestion? There is a tutorial on this on one of those good old sun-servers: Clickedy
regards,
Torsten
I never finish anyth...
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