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Can anyone recommend a library for chart generation (bar charts, pie charts etc.) which runs on both Java and .Net?
ChartDirector is fantastic and supports more than just Java and .NET.
Have you looking into using JFreeChart. I have used it on a few Java projects and its very configurable. Its free but I think you can purchase the developers guide for $50. Its good for quick simple charts too. However performance for real-time data is not quite up to par (Check out the FAQ).
They also have a port to .NET however I have never used it.
Hope that helps.
Dundas Charts was about the easiest thing ever to get up and producing amazing looking charts.
Flash Charts.
http://www.fusioncharts.com/free/Gallery.asp
You could also try Open Flash Charts
ChartFX (http://www.softwarefx.com) has been a leader in charting for years. I personally have used several different versions for over 8 years and it is rock solid.
I have re-evaluated charting options periodically, and ChartFX has won in my environment based almost purely on feature set. It is not free or cheap, but it is well worth the price they charge.
-Geoffrey
Here is a belated answer:
Use the Google Chart API. It will allow you to create charts in a programming language and platform agnostic way -- assuming your app will have an Internet connection at all times. Use it in combination with .Net and Java wrapper APIs that you can find here.
I wrote one: charts4j.
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I have a Java application. I can expose it using web services or REST (JAX-WS or JAX-RS).
Now I actually want to run it "in a cloud" and expose it as a service. I have read around that there are services e.g. Apigee, Rackspace, Google App Engine... The idea is that I don't want to worry about scale and performance. I want that handled by the host.
What are the options for Java?
Thanks,
David.
After a bit of homework, here's what I am gathering:
This is really about Java PaaS offerings (platform as a service).
In addition to what I previously mentioned,
Google App Engine
Rackspace
Apigee
it's worth adding:
Jelastic
CloudBees
There's also a guide - albeit old - from InfoQ that can be read here.
Depends on amount of money you can spend.
This cloud hosting seems interesting.
There's Heroku too, or even AWS.
Amazon AWS provides auto-scaling features that you can configure so you don't have to "worry about scale" day to day, though you do have to set it up in the first place (you will also have to monitor your bill in case you are scaling big-time ;) ). It works well and provides decent monitoring/visualization if you are happy to do the set up.
I can't say whatthe other systems you are investigating have to offer in terms of automatic scaling though.
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I've never done anything in Java before but I'd like to use Lucene for the search on a site.
I'm having trouble find a good step by step tutorial for a complete beginner at this.
Can anyone recommend a good tutorial?
Thanks
Along with user428747 answer, you can also read this article.
As well as this one (which is kind of old compared to the first one).
On a side note, if you want to use Lucene, did you consider using Solr?
It uses the lucene search library and extends it as you can read here.
The classics: Lucene in Action
this website might help you a bit..
http://www.lucenetutorial.com/lucene-in-5-minutes.html
This is not a direct reply to your question on Lucene tutorials (For that, my answer is same as some of the other posters: Bob Carpenter's Lucene in 60 seconds tutorial on the Lingpipe blog).
If you don't want to learn Java just for Lucene, any full-text search database (Postgres/Mysql/etc) should solve your purpose. In particular Sphinx is recommended.
This decision particularly relevant if you need your search app to have high performance / scalability (since you will be learning two things - Java and Lucene). Unless you have an in-house java expert, it is better to fight one war than two at the same time.
maybe apache solr is better for you: http://lucene.apache.org/solr/
If you're using Zend, why aren't you using Zend's PHP port of lucene? See here for a tutorial on it.
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Could someone please recommend a simple (as in very easy to understand) charting library for Java?
I just want to add a simple chart into my program and figured I might save some time by learning a library.
JFreeChart is one of the best open source charting packages for java.
A litte outdated, but still working and with free documentation (JFreeChart has just the API for free, the devguide is saled) is jCharts.
A sample code for Swing is available here, if you don't need anything fancy or special it may be easier than JFreeChart because of the direct available documentation.
JFreeChart is definitely the way to go. Although the (for-sale) manual is useful if you're doing a huge amount of work using this, it's instructive in the first instance to check out this huge selection of examples (screenshots and code). That will get you 90% of what you need.
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Are there any decent BitTorrent libraries for Java? I need to program a simple torrent client, but it would be great if I didn't have to write everything from scratch.
Turn's TTorrent is a pure Java bit torrent library.
Snark by Three Rings is a very lightweight bitorrent library that will give you basic torrent features.
Was originally written by Mark Wielaard. A github source can be found here https://github.com/akerigan/born-again-snark
I have created a Bitlet Fork on Github.
It's LGPLed, and it's running faster than ttorent.
Azureus (now named Vuze) gives you a plugin API. Using this API you can plug your code into Azureus. Start it inside your program, and listen/respond to its events.
Azureus is written in Java - is most likely not "simple" but quite likely "decent" :)
Adding to answer from jjnguy : The code seems to be at http://code.google.com/p/snark/ and not in the repo pointed to in the link you've provided.
I've not used it, but a Google search showed up YAIRCC. Describes itself as "A lightweight Java Bittorrent library and client".
Transdroid and Transdroid-desktop are libraries for adroid, that can also be used in java to control existing torrent clients.
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What is the best open source java workflow framework (e.g. OSWorkflow, jBPM, XFlow etc.)?
Here's an article that compares kBPM, OpenWFE, and Enhydra Shark that looks like it has some good, thorough info.
It depends what kind of initial investment you want to make. jBPM is the best in terms of features and flexibility, but OSWorkflow is a more lightweight, easier to get up and running and has with a smaller learning curve.
Drools Flow is the best workflow solution that I came across recently. It has a luxury to be better than other solutions, since it is built and designed recently, and based on lessons learned from other long existing, somewhat over engineered frameworks.
Drools Flow comes as a community project along with an official Drools 5 release that besides Flow includes: Guvnor, Expert and Fusion.
Unfortunately Drools Flow does not have an official Red Hat support contract yet, and that is a stopper for some big corporations to consider it. One might think the support is not there for political reasons due to the jBPM project living under same support roof.
I'll cast a vote for jBPM. We used it on a larg-ish ETL platform in-house and it seemed to work quite well. I don't have anything to compare it to, however.
YAWL - Yet another workflow Language
http://en.wikipedia.org/wiki/YAWL