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Should i use play framework or normal Java EE [closed]

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Am planning to start a website that I will use commercially. I recently have heard of the Play framework and it looks good. But am not sure if I should use it or not. I know java, jsp, servlets and struts 1.
I don't know how stable that framework is? Should I go with a native Java EE application or should I use Play?

If you want to have a rapid return on investment play is your friend.
Within days of using it you can get a web site up and running (which even for an experienced Java EE developer is a bit of a challenge). I think you need to balance you requirements with the advantages of play.
Check this interesting post: https://stackoverflow.com/questions/5376732/what-is-pro-and-contra-of-using-play-framework
Play is always gaining more momentum and there are already a few commercial websites using it http://www.playframework.org/community/testimonials.
I would also add that play is fun to develop with which will also add to your productivity!

Play is stable. It now has some big reference sites, including the guardian.co.uk and more and more sites are springing up all the time. It is very easy to develop in, has its own dedicated hosting service (if required) and has a very active community.
As for whether you should use it or not, is too subjective a question to answer fairly. I use it, and would always now do so over a Java EE application, but my needs (quick, clean, not bloated) may not be the same drivers as yours.
I would suggest doing a proof of concept in both technologies, and see which one suites your needs the best. If you cant afford the time to do a proof of concept, maybe you should stick to what you know?

Play does indeed look nice and clean. From my experience using any new framework will bring its pros and cons. Play might be buggy, you seem to know Java EE. It really depends on what you want to do and how much you're willing to invest in learning something new.
In my opinion it is always possible to transition to some new way of delivering your site content. It's healthy to keep experimenting with new frameworks, but wiser to build business on a framework you know. That way the bottleneck wont be the technology.

Part of the answer is in the answer to the question: What is the purpose of this website?
Personally, I would stick with more well-used frameworks like Java EE (version 5 & 6 have a LOT less cruft than the older versions) or something like Spring or Seam. If you are going for a simple site, maybe look into JBoss Seam.

how to choose an open source library? [closed]

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when every one of us program in java he would need a library (some jars) to complete his work .
so when this programmer find some libraries he need . how he can find the best of these libs ?
thanks.

I don't program in Java much but I do need to hunt down libraries for C++ and Python, which are my mainstays.
I think some criteria you can apply to stuff you find on Google or community sites like SO and java.net include the following:
How well documented is the project? Is it just API documentation? Does it have samples? Are they documented or just spat out? Are there tutorials?
When was the last stable/unstable/testing release? Do version control logs indicate activity in the project? (Google Code projects have a indicator on the right side of the page which shows project activity) Are their mailing lists active? Do a lot of people ask questions and questions get answered? Are developers talking on their mailing lists?
Is the API to your liking? This is both a matter of personal preference and objective measuring. As an example, for C++ GUIs, some people like the API of wxWidgets more, whereas some people like the API of Qt more, and there are people who are more productive in each, but there are also good reasons to believe objectively why one is better than the other API-wise.
Is the project "famous"? This is kind of iffy because it relies on groupthink, but there is some merit to considering projects based on how "famous" or "well-known" or "widely-used" they are. It helps because this is normally an indicator of reliability (emphasis on normally, i.e. not always). The communities will probably be more active and knowledgeable. You can tap onto existing programmers who are already probably familiar with these APIs and hire them or recruit them, etc. For example, I suppose that other than being generally quite good, a lot of people go for Lucene as their text search system because it is very widely used.
How mature is the project? Is it in alpha? Beta? Pre-release? Sometimes you find a library you really like but it's very raw. Depending on the nature of your project, you may want to reconsider using it.
All that said, generally good places to find good Java libraries are probably projects from Apache and those published by Google.
This is all I have for now. Take them with a pinch of salt. If I have anything else to add I will edit this post.
Hope this helps!

I rarely need additional "Generic" libraries. If that's what you are after you might keep an eye on the Apache stuff--there are a few groups like that that just do generally good work, but most of the stuff you could get in a general library like that you can write yourself just as quickly as you can learn to use their stuff.
Occasionally I need a specific library like an SNMP library or something to provide a specific service--these are actually NEEDed because rewriting them would be prohibitive. These are much more important to choose correctly, but generally there aren't so many to choose from and a co worker will almost certainly have some experience or opinions if you don't.
Researching stuff like this should be a scheduled part of every project--the need to do the research should be identified in the early phases of the project.

What cool frameworks are there on Java/Ruby etc. that don't exist on .NET? [closed]

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I was just reading a post from Justin Etheredge in which he wrote "... I get so jealous when I talk to the Java guys at work and see all of the freaking awesome tools that they have for free on their platform. Since I use the NUnit, NCover, NHibernate, NAnt stack when doing most .NET development, sometimes I feel like we are just a bunch of copycats".
What other cool frameworks exist that aren't on .NET and I may not know about? Can we leave out things which have a direct or pretty reasonable analogue, just the kewl shiznit!
PS we aren't so bad. I'm pretty sure NDepend started out on .NET and has moved to Java
PPS one answer per item please! It makes it a lot easier to discuss them!

http://ruby.sadi.st/Heckle.html
Think you write good tests? Not bloody
likely... Put it to the test with
heckle. It’ll put your code into
submission in seconds.
The premise is really really simple to
understand:
★ Your tests should pass. ★ Break your
code. ★ Now they should fail.
You could check this by hand, but why
bother? Use heckle and put it to the
test:
heckle -f ClassName
For each failure heckle points out,
you've got a test to write.
Chances are, your tests suck.

Maybe you should ask the Java folks (add some Java tag), .NET tag watchers may not know about Java frameworks .NET does not have :)

Liquibase - A library for tracking, managing and applying database changes.
A decent embedded webserver, such as Jetty
A build system equivalent to Maven
An embedded AD/LDAP server for development purposes, such as ApacheDS

http://www.terracotta.org/ A kind of distributed JVM which shares objects automatically across a farm. Or something. Reading http://willcode4beer.com/design.jsp?set=kill_your_db makes it sound pretty cool.

At work, we use the ATG e-commerce platform, JBoss to run our local builds and Maven to build everything. We also have components from the Struts framework.
Personally speaking, I prefer the Spring Framework. IOC is my new favourite pattern!

What Java framework would you use with Google App Engine? [closed]

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It's been a while since I've done any website with with Java, and am wondering what framework options are out there for Google App Engine.
What framework would you suggest for someone who has no real preference?
I like Ruby On Rails, and am getting into Django, and like that as well. Professionally I'm a ASP.NET developer so I have the most experience with that, but I'm looking to expand into other technologies, and patterns.
It would be nice to have more experience with MVC.
thanks,
Mark

The Spring Framework works, although you have to make sure commons-logging isn't called commons-logging-1.1.1.jar (as I had it in maven conventions, Google provides a jar with this same name and there are classloading issues as a result). So, Spring WebMVC is confirmed to work - which raises the possibility that its sister project Spring Webflow will work - though I can't say I really like where Webflow 2 completely diverged from Webflow 1.
Also, I have yet to find a framework that really encompasses the notion of "saving and continuing" well - users often like to do that, and Webflow 2 really tries to make programming that as difficult as possible if you use its persistence context inside the flows themselves.

Wicket works on App Engine, you just have to make a few tweaks to the configuration.

I've had variable experiences with Vaadin on GAE. Some applications are almost as fast as with localhost, but sometimes the latency is freakish. Probably depends on which server geographically your application gets deployed on.

Try ItsNat, more info.

Don't use it for a simple single reason - vendor lock in.
What happens if the service doesn't meet your satisfaction?
What happens if you can get a better deal (Java hosting) somewhere else?
What if you want to sell your product - where's your platform?
What happens if Google decides App Engine is not worth their effort and close it?
as a side note Google have and will close services that are unprofitable. A simple search will reveal many, escpecially in theses trying times.
Do you care about vendor lock in?
If you don't care about losing your effort and time invested and perhaps want a platform just to play with then I suppose it's OK but for anything serious stay away.

Good Stripes tutorials / examples? [closed]

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The company I just started working for is using Stripes for parts of its web page development these days, and while it seems to be a nice enough web framework it no one really uses it-- it is almost non existent on the 'net. It's not even first in it's google search and the result you do get is for its old home page.
So, do any of you people use Stripes? Of your own volition? Do you know of any good tutorials / examples?

I recommend checking out the book referenced by jko:
a book from The Pragmatic Bookshelf called Stripes: ...and Java web development is fun again
Whilst still in 'beta' the book covers everything very well.
Another good place to start is this ONJava article.
I have used Stripes on a few projects now and have liked it a lot.
It may sound crazy but the Stripes quickstart and sample application documentation on the website does a pretty good job of covering the bases.
This is helped by the fact there is little to Stripes, probably because it is relatively new and not trying to be all things to all people. I would say give the quick-start a try and if by the end of it you are unsatisfied look elsewhere. At the end of the day you and your company have to be happy (and productive) with what you are using irrespective of how many people are using it.

I've never used (or even heard of) Stripes.
Regardless, there's a book from The Pragmatic Bookshelf called Stripes: ...and Java web development is fun again that may be worth checking out. You could also check out the Stripes mailing list archive.

It's a shame that some people perceive Stripes as a framework for which "there really just isn't much support or information for it." In reality, the Stripes community is very supportive - have a look at the mailing list and you'll see how friendly and responsive people are. In fact, some have said on the #stripes IRC channel that they have had better response for Hibernate-related questions than on #hibernate itself!
Give Stripes a good, serious look instead of dismissing it because of misconceptions.

Stripes is a great framework. We converted a major project from a home grown framework to stripes and it took less than one week.
The book referenced above is a great resources, as is the mailing list.
There's also an active irc channel #stripes on freenode.
It's a very powerful framework that doesn't get in your way.

We considered it when we were looking at open source frameworks. But we saw the same thing your did that there really just isn't much support or information for it. You should always weight the community support factor surrounding open source projects before picking one. (which is what you are doing here)