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I'm looking for recommendations for a simple open source implementation of a Distributed Hash Table in Java to play around with. No fancy features, just for learning purposes, no production functionality needed. It should be simple to set up (e.g. 1 physical machine with n-JVMs) and well documented preferably with some examples, tutorials or starting guides.
Research yields these candidates: FreePastry and OpenChord but I'm not fully convinced they meet my criteria simplicity-wise.
Have you got any experience with these or other implementations? Recommendations?
Thanks & adios
There is TomP2P on Github.
Maybe JDHT will fit the bill. I haven't checked it out myself, but it's written at a university, sometimes that means it's simple and used for teaching. :-)
I have been working on an implementation of Kademlia lately. It's very simple to setup and use and it's well documented. There are several tests written that demonstrate the different functionality as well as a starting guide in the Readme.md file itself.
You can use openkad
I started with free pastry..I've had a great experience with it. It was very simple to set up and run a ring of nodes. I've been mainly using PAST (File storage) and its been quite easy to get running. I'd suggest having a look at the PAST tutorial here. https://trac.freepastry.org/wiki/tut_past
The code is over simplified in my opinion but you say that is all you need so I guess thats ok.
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I'm writing the code to access and download data from some web sites using HTMLUnit.
I was wondering whether a tool that could help me exists. I think maybe to a visual tool, something that lets you express the path you want to follow on the web sites visually and generates the Java code.
I'd like something for HTMLUnit, but I'm open to other solutions.
Writing screen-scraping code gets very repetitive :(
I used to work at screen-scraper. Not sure if it's quite what you're looking for, but it's definitely a powerful tool for building web-scraping scripts.
Not exactly visual tools, but maybe you could use something like JMeter or The Grinder for recording navigation scripts of web pages. They surely are easier to use than writing all the input requests by hand in HTMLUnit.
There is only one tool that does exactly this - and does it very very well - but it's highly expensive, since their technology is amazing. Some of the biggest companies uses this. I think you might be able to get a free trail, if you want to try it out. http://kapowsoftware.com/
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I am looking for a framework that will help me to build help system for my java based web application. Would be great if it will be the system that easy to use and maintain but provides all features average help system needs.
At the moment I see it as a some kind of system that will produce bunch of html pages with search functionality located in http://host/MySuperApp/docs/. The documentation will have a lot of code snippets and graphics. At the moment multilanguage support is not really needed even it is standard feature this days.
Any other features that are great but I wasn't thinking about them yet are welcome.
Any suggestions are appretiated,
Thank you guys in advance!
Some years ago, I worked with the Eclipse Help System. Eclipse is not necessarily needed to integrate it in your project. Its helpfiles are also based on .html pages. Unfortunatly I dont know if they continue developing it, but at this time it already provided all the aspects you would expect from a help system.
There are a lot examples out there on how to integrate it in your project, but its possible, that maybe there are already better frameworks today.
Have you tried http://www.sphinx-doc.org/en/stable/. It was initially created for python. Very easy to use.
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I need to start developing using this technology servlets/jsp with tomcat. I need to get up to speed fairly quick. What would you recommend to get up there fairly quick? No 900+ pages manuals. A good tutorial (even a video lectures) with lots of examples would be perfect.
Thanks
Check out simple.souther.us
Hanging out at JavaRanch is a good idea
Getting a Head First Servlet and JSP is worth it
J2EE tutorial is good to go too
I would install Tomcat, and look at all of the included examples. Each example shows a different feature or way of using Tomcat. If you start tomcat up with the defaults, you should be able to go straight to http://localhost:8080/examples to view them.
CoreServlets.com has a good tutorial using Tomcat 6.0:
http://www.coreservlets.com/Apache-Tomcat-Tutorial/
or if you prefer a visual approach then check out this video (wchi additionally introduces Eclipse and WTP into the mix - but it's a good practice to use this to develop simple web applications):
http://www.youtube.com/watch?v=-l0CFxdroTE
I think that the following link will answer not almost all but literally all doubts that you have about servlets and give you a nice flow to study them.
this website is most appropriate since it provides examples as well and is more practical based teacher.
enjoy
http://www.roseindia.net/servlets/
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Is there an Open Source java alternative to GraphViz? I'm aware of the existence of Grappa which basically wraps the Graph interface to GraphViz as an JavaAPI. However the layouting is still done by the GraphViz binaries.
I'm looking for a pure-java, open source library providing the same functions and layouting algorithms as GraphViz.
You can have a look at JUNG (Java Universal Network/Graph Framework) which has visualization and analytics functions. It's open source.
Interestingly, the Eclipse project has an SWT/JFace component/framework capable of displaying and generating (import/export) Graphviz's 'DOT' format, in pure Java:
ZEST (home page & download links)
See http://wiki.eclipse.org/Graphviz_DOT_as_a_DSL_for_Zest for usage examples.
Although ZEST is touted as an Eclipse plugin, it does seem that the DOT-manipulation API's can be used standalone and external to an Eclipse installation.
To clarify, the DOT functionality is a part of the ZEST 2 functionality, which itself is a sub-component of the GEF4 project.
Cheers
Rich
Update (May 2017) https://github.com/nidi3/graphviz-java
You could look at JGraph though I have never used it so cannot comment on now it compares to GraphViz.
yFiles seems to provide all this, but it's not free and not really cheap either. But then again it seems to be a very professional product (haven't used it, except in yEd, which can be used for free).
I guess ZGRViewer is what you want. I really like ZGRViewer and AJaPaD.
I worked with yFiles about four years ago, and it was excellent. It's costly (though less than JGraph, apparently) but I work in a CS research lab and had access to their generous academic pricing.
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I'm currently designing a Java application where a Rule engine could be useful. Where is a good place I can learn about how to use them, how they work, how to implement them, see samples, etc.?
The Drools documentation includes a lot of useful, general purpose information. Especially chapter 2, which covers rule engine basics, knowledge representation, etc. It also includes a nice recommended reading list for coming up to speed on rule engines and expert systems.
For most rule engines, a basic understanding of the rete algorithm usually comes in handy for writing efficient rules. I have personally found the Doorenbos paper referenced in the Wikipedia article to be the clearest technical explanation.
Also, here is a list of open source rule engines in Java.
You might want to read "Should I use a Rules Engine?" from Martin Fowler's blog.
I have worked on a project where we built our own (very simple) rules engine, with the intention to move to a general rule engine when things got too complicated. Never reached that point though, the system has been running happily with the simple homegrown engine for several years now.
I found this site pretty helpful. Are you looking at building your own, or using a 3rd party library?