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The "jsch" based implementation works for me.
But it looks not modern one due to using Vector (old style Java collection).
I found that the other implementations are less popular and not documented.
Can you recommend implementation of SFTP library that he/she has good experience with it.
Thanks.
It works. Who cares if it uses Vector? It's by far the most popular one. In fact, it's the only one I can think of without resorting to Google.
There is a newer "version" of Jsch on github. It is a vast improvement to the existing library in many ways. Check out the README on the site and the comprehensive javadoc for more information. https://github.com/vngx/vngx-jsch. It's also available on most major maven repos and it's OSGi compatible. There are quite a few alternatives, but this one is solid and I believe the most up-to-date (spec/code/docs). Disclaimer: I am a contributor.
As #dty said, as long as your application can work smoothly why do you care for the usage of deprecated classes/methods in the library ?
You only need to care about what you're calling, not how does it work in the inside.
You can also use abstraction tools above JSch, but it won't change a thing.
You can also check for JSch alternatives, but as JSch is widely used you'll have probably less bugs with it.
You may also want to take a look at IP*Works! SSH from /n software.
I have used this library https://github.com/shikhar/sshj/. Its has got an excellent API [Requires Java 6].
A cheaper commercial alternative (my own product, for disclosure), is edtFTPj/PRO.
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I’ve been having issues lately because my dependencies has been updated to use netty 4.1 and Gatling has not been updated for a while, and still work only on Netty 4.0.
Anybody knows any alternative to Gatling to create similar Simulations and scenarios for the performance test to be run automatically in my Maven life cycle?
If you look for something code-based it would be:
Locust
Grinder
For UI and/or XML based scenario definition you can check out:
Tsung (this one can be reliably run on Linux/Unix only)
Apache JMeter
Check out Open Source Load Testing Tools: Which One Should You Use? to learn more about the aforementioned tools and decide which one fits to your most.
As a nice replacement for Gatling I would recommend you to check the Locust. The good thing about the Locust specifically for you is that it is code based performance testing tool which does not enforce you to write the tests only in a specific programming language like Python. Because if you used Scala before, you might be more comfortable to switch to something like Java or even Kotlin while writing your tests which is more than doable using Locust framework. You can find the handy tutorial by this link:
https://www.blazemeter.com/blog/locust-performance-testing-using-java-and-kotlin
Here's also a benchmark comparison of different tools.
If you are javascript/Ecma familiar k6 does the job.
Apache JMeter is a known alternative to Gatling.
It is frequently updated (at least 2 major releases per year) and has a strong user base and a lot of commercial offers.
There is a Maven Plugin that is being recently much more frequently updated, there has been 4 releases in 2 months.
Look at code coverage in more details.
k6 is a good alternative, if js is not a problem for you. https://k6.io/
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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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This question is a bit vague but I'd like to know if there's a Java tool that can run through my code and document it in a functional way. Is JavaDoc the only way to go, or are there alternatives?
JavaDoc is a good way of generating reference documentation. You can use custom doclets to adapt it to your needs (in look, functionality or extra bells-and-whistle) but it is still essentially still a list of methods and their descriptions.
Documenting enterprise software is more about documenting higher level stuff like design information, architecture, component interactions, etc. There's no software tool I know of that will do this for you automatically (reverse engineering tools will mostly produce a mess), but there are many content management systems that can help you organize and present it better.
You could also write a JavaDoc alternative (or use something existing) that uses reflection to analyze a class library and produce stuff, possibly with your help via annotations. For instance, there are research tools that let you place architectural constraints within your code, that are then used for conformance testing and possibly for documentation.
It all depends on what you want out of the generated documentation. JavaDoc is the standard way to do API documentation in Java, so that's probably your best starting point. There's actually a Doclet API if you just need to tweak the output. One example of the Doclet API in action is the UMLGraph doclet that can embed UML graphs in your JavaDoc output.
If you just hate JavaDoc, there's always things like Doxygen.
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I'm looking for a well-maintained Java bytecode manipulation library with an intuitive API. There seem to be quite a lot of them out there. Any suggestions on which ones to try?
The best answer to your question will be governed by your specific needs and objectives; if you can expand upon what you're trying to accomplish, I can perhaps offer a more tailored response.
In lieu of that, however, in my experience, ASM offers probably the best combination of maturity, flexibility, and ease-of-use:
It's under relatively active development: even though the latest release is from June 2009, developers are regularly making commits to their VCS.
It's already in wide use in a number of prominent Java products, such as AspectJ, Groovy, Cobertura, and many others, which promises a wide user-base and thus a wide community for support.
It's fairly thoroughly documented, and there are a number of tutorials, user guides, and reference documents available both from the OW2 Consortium and the community at large.
N.B. The comment #Yuri left below describes a situation I personally haven't yet encountered but that may potentially pose a significant obstacle. Keep his observation/experience in mind while evaluating the various bytecode manipulation libraries.
That actually depends on how you define intuitive ;-) I started using ASM two weeks ago for a certain task on my current project and it worked like a charm. It only took me a couple hours to understand it and be able to use it, but I wouldn't exactly call the API intuitive. But if you know a little bit about Java bytecode and are familiar with the visitor pattern, the learning curve is not very high, IMO.
Another advantage of ASM is that it is apparently bundled with the standard API at least in the Sun JDK, although in a different package (com.sun.xml.internal.ws.org.objectweb.asm and subpackages).
Take a look at this article :
http://www.pabrantes.net/blog/space/start/2008-03-24/1
A little old but still relevant.
ASM And Javassist are the most used ones now.
Bcel is dying.
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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.