I have just recently come across graph databases and Tinkerpop.
I am somewhat confused on how/what to install to use Tinkerpop 2.5.0/2.6.0. Does it have to be installed on each Database separately (as you would a plugin) or can I set it up and then use it to access different supported software.
My goal is to use it to try out 2 (possibly more) different databases (mainly Neo4j and OrientDB or perhaps Titan) and be able to query them using Gremlin.
How you use TinkerPop is entirely dependent on what you intend to do with it. If you are just getting started, I suggest you simply download the Gremlin distribution, unpackage it and start the console with bin/gremlin.sh. Working in the REPL will help you learn quickly as the feedback time for trying things out is basically instantaneous. Even as your Gremlin code makes its way to production, you will find the Gremlin Console to be a good friend as it provides a way to try out ideas before committing them to code. It also provides a mechanism for maintaining/administering your database with Gremlin.
If you intend to use TinkerPop in a JVM-based application then you will want to use a dependency management tool like Maven and reference the appropriate TinkerPop dependencies you'd like to use. Alternatively, I suppose you could try to manually manage the dependencies by downloading them individually from Maven Central and adding them to your path (though I wouldn't recommend that for obvious reasons). I guess my point for suggesting that, is to just make it clear that the TinkerPop library is just a set of jars that can be included in your JVM development tools like any other.
How you work with a particular database is dependent on the one that you choose, but again the process is little different than what I described above. Neo4j is packaged with the Gremlin Console, so you can work with it right away in there. For OrientDB, you will want to copy those dependencies into the Gremlin Console path (i.e. the /lib directory). If you are building an application, then maven is again your friend and you simply reference the Neo4j or OrientDB maven coordinates and all require dependencies will come with it.
Some implementations, like Titan, have separate prerequisites (e.g. install cassandra or hbase). In those cases, you will need to refer to their documentation for specifics on how to set them up.
All that said, if you are just getting started, I recommend that you look into TinkerPop3. It is the next major line of development for TinkerPop and quit different from it's previous incarnations. It does not yet have all the of the implementations in play as of yet, but database vendors are at work to bring them online. All that I wrote about TinkerPop 2.x "installation" above generally applies to TinkerPop3, however, the TinkerPop3 Gremlin Console does have a plugin system that can help make it a little easier to bring in external dependencies, preventing you from having to worry about dealing with them manually.
Related
Using this: https://github.com/JetBrains/skiko/
I was able to get the SkiaAwtSample to work and it shows a window with a grid of animating clocks. It shows that the backend is OpenGL (I'm using Linux Mint 21, and have NVidia proprietary drivers installed). My first impression is that the performance seems average at best. I predict if I'd try to replicate this using plain old Java2D, I'd get similar performance. I also predict that the performance of Java2D is downplayed. But it is not performance that I am after.
I want to stop investing in UI and graphics technologies that aren't portable.
The samples directory shows these 4 subdirectories:
SkiaAndroidSample SkiaAwtSample SkiaJsSample SkiaMultiplatformSample
When I try to use the build target in the SkiaJsSample directory, I get a long maven error report, that amounts to a dependency not having been met. It wants org.jetbrains.skiko:skiko:0.0.0-SNAPSHOT with 'org.jetbrains.kotlin.platform.type' with value 'js'.
The DEVELOPMENT.md file only mentions of building and making available in the local maven repo using :skiko:publishToMavenLocal
Digging further, I tried :skiko-js-wasm-runtime:publicToMavenLocal but no such target exists.
It seems only the awt stuff is included in the github repository. Isn't the whole thing open source. I can find wasm related entries in online maven repos, but why can't we build it locally and public to our local maven repos?
Pentaho Data Integration 8.0.x is using Janino 2.5.16, released in 2010 for compiling the User Defined Java Class step. There is a JIRA in pentaho for updating this to use a newer Janino version which would bring new java 8 related features in pentaho v8.2.0 GA. But there is no info on when will this be released.
Is there any other way I can use a newer janino version (janino-3.0.8.jar) with exiting pentaho for UDJC? I tried to copy updated jar in the lib and also added commons-compiler-3.0.8.jar to fulfill dependency. Now when I open Spoon, I get the following error:
Please advise on how this can be achieved. I understand that just replacing the jar may not be enough but just want if something else can be done.
This is not easy. Even now, since you got ClassNotFound, public api of janino is changed. Some classes are removed some are changed. What is actual needs to update it?
If you need really complicated business logic, then create custom plugin. Documentation and tutorials are available and you can look into sources of current builtin plugins (sources are available on github).
What important new version of janino has, that old doesn't (beside java8 support)? Checkout kettle engine, look into sources of UserDefinedClass step, change code to support new janino version, test and make own build of pdi kettle, and try to send push request to maintainers of repository.
Any of this quite complicated, This plugin is builtin into engine, and you have to make own build. Own build means, you have to support it by yourself. This is non trivial, project is huge and now even bigger and continue evolving, I spent several days to make my first custom build (version of 4, was in ivy) just for purpose to know better and debug complicated cases, and it used never in production.
Maintainers of repository must have good reason to include your changes into stream, it must be well tested and it is long procedure and most probably doesn't worth it. A lots of changed since 2010, I probable have seen in release notes, new version of java already have abilities to compile at runtime.
My advice is to make you own plugin.
We have a largish standalone (i.e. not Java EE) commercial Java project (10,000+ classes, four or five SVN repositories, ten or twenty third-party libraries) that's in the process of switching over to Maven. Unfortunately only one engineer (in a team of a dozen or so distributed across three countries) has any prior Maven experience, so we're kind of figuring it out as we go.
In the old Ant way of doing things, we'd:
check out source code from three or four repositories
compile it all into a single monolithic JAR
release that (as part of a ZIP file with library JARs, an installer, various config files, etc.)
check the JAR into SVN so we had a record of what the customers had actually got.
Now, we've got a Maven repository full of artifacts, and a build process that depends on Maven having access to that repository. So if we need to replicate what we actually shipped to a customer, we need to do a build against a Maven repository that has all the proper versions of everything. This is doable, I guess, if in (some version of) the (SVN-controlled) POM files we set all the dependencies to released versions?
But it gives our release engineer the creepy-crawlies, because there doesn't seem to be any way:
to make sure that somebody doesn't clobber the copy of foo-api-1.2.3.jar on the WebDAV server by mistake (the WebDAV server has access control, but that wouldn't stop a buggy build script)
to detect it if they did
to recover afterwards
His idea is, for release builds, to use a local file system as the repository rather than the WebDAV server, and put that local repository under SVN control.
Our one Maven-experienced engineer doesn't like that -- I guess because he doesn't like putting binaries under version control? -- and suggests that maybe the professional version of the Nexus server can solve the clobbering or clobber-tracking/recovery problem.
Personally, I'm not happy (sorry, Sonatype readers) with shelling out money for a non-free build system when we haven't even seen any benefit from the free version yet, and there's no guarantee it will actually solve the problem.
So our choices seem to be:
WebDAV server
Pros: only one server, also accessible by devs, ...?
Cons: easy clobbering, no clobber-tracking/recovery
Local file system
Pros: can be placed under revision control
Cons: only works with the distribution script
Frankly, both of these seem like hacks to me, and I have to wonder if there isn't a better way to do this.
So: Is there a right thing to do here?
I'm not sure to get everything but I would:
Use the maven-release-plugin (which automates the release process i.e. execute all the steps documented in release:prepare).
Use WebDAV with anonymous read-only and authenticated write policy (so only release engineer can actually deploy released artifacts to the corporate repo).
There is a no need to put generated artifacts under version control (if you have the poms under version control). I don't see the benefits of using the local file system instead of WebDAV (this is not providing more security, you can secure WebDAV as well). I don't see what the commercial version of Nexus would solve here.
Nexus has a setting which prevents you from clobbering an already released artefact in a release repository.
For a team of about a dozen, the free version of Nexus should be enough.
I am to migrate a Websphere machine (including the applications which run on it) to a new machine. They wanted a clean install of the OS and WebSphere, so I did that. I also took a full file backup of all of the applications they had on the old server. The problem is that to re-install them on the new server, the WebSphere dialog asks me for the JAR/EAR/WAR file, which I don't have.
Is there any reasonably easy way to simply extract the backup of the WebSphere application files I have taken from the old maching, and simply configure the new machine to use them? WAR, etc. is a nice feature to have, but to be forced to use it seems silly.
Edit: The existing WebSphere server is still up and running in production.
Edit: The old server is WAS 3.5, which means it doesn't even have an export function, sadly. Also, the directory where it actually runs the content from has a completely different structure (consisting of like a a %/Web and %/Servlet, where % is the context path of the application). In the "Install" section, it doesn't even mention EAR or WAR, only JAR. I am currently thinking that perhaps the best thing to do might be to just copy the directory over to another WAS 3.5 system and then upgrade that system (and hope it converts the folder structure and updated the config as part of the upgrade).
Edit: The closest thing I have found to a solution so far is this link:
http://www.javazoom.net/services/newsletter/was4.html (though I am not sure if that tool is available or relevant for WAS 7.x).
This has to be a problem other people have run into before, but I can't find a solution anywhere on the WEB.
Thank you!
Here do they have sample Jacl scripts one can use to export/import appserver's configuration. So that is what you can start with. If your new bow uses the same version of WAS (and the same topology if it is not a standalone box) as the old one, it might be a (relatively) safe process.
Migration between different versions of Websphere might be somewhat more tricky, but I'm sure IBM published at least one redbook on that topic.
If you still have the old server running, than just export the apps and you have the war/ear files. However, If you don't know the configuration for the apps, you are screwed. However, I am sure IBM has tools that you can use. Some of the paid tools look even nice and user friendly (at least according to their sales demos). I can't tell you what you need, since I don't know what documentation you have for your apps. But as it looks like there is not much there, otherwise you would just install the application the same way they were installed on your old server and use the binaries (war, ear, jar) that are archived somewhere.
Are there any differences between the original CruiseControl and the .NET port? I've compared the 2, but can't find any big differences except the language it has been developed in. I want to use either one of them for (automated) testing of web applications, using Selenium and Subversion, perhaps even Groovy but don't know which to choose.
[edit]
After looking at CC and Hudson, I've chosen Hudson for it's simplicity, it already has plugins to run Groovy scripts and Selenium as well
Choose me, choose me! (I work on the original CruiseControl.)
I've never used CC.NET but from what I know I agree that they are pretty comparable. Probably the most important difference is cross-platform vs. Windows only.
Now I wonder how long until someone comes by and says their both crap and you should try Hudson? ;)
(And of course there are lots of other choices...)
CruiseControl.NET (cc.net henceforth) has build queues (http://confluence.public.thoughtworks.org/display/CCNET/Project+Configuration+Block), which allows you to serialize builds that depends on a certain build order. I'm in the process of emulating this behavior in the java version of cruisecontrol but the functionality doesn't map one to one. The reason however, that I'm at all moving from the .net to the java version is that the .net version core dumps with mono (cc.net nightly build and mono nightly build as of two months ago). The fault lies with monos thread handling but voids attempts to get cc.net up and running.
The documentation on this can be tricky to find, if you don't notice the version numbers that the configuration examples/documentation adhere to (confluence.public.thoughtworks.org has the updated configuration documentation whereas ccnet.sourceforge.net has not. I know that the ccnet is most likely a dead site, but if your're not carefully reading the datestamps on every page you're visiting, this may bite you).
Furthermore, the sourcecontrol blocks for cvs and svn in cc.net are more granular and featurerich than their counterpart in the java version, but this has not been a problem in my work. The java version is also easy to extend/modify re: plugin behavior, but you would really just like to see this kind of work going upstream instead of forking.
I'm fairly impressed with both the java version and the fork in .net (modulo mono runtime behavior), but you really do not want to try any of the other forks of cruisecontrol. I've had peripheral experience with hudson, and the features were just not compelling enough to veer me from cruisecontrol. Hudson has a (somewhat coloured) comparison map of Hudson and CruiseControl (java) at http://hudson.gotdns.com/wiki/display/HUDSON/Home
A viable alternative is the python implemented buildbot (http://buildbot.net/trac). It does not have fancy gui dashboards and the setup is somewhat more commandline-bound, but if you're doing distributed builds, it's very easy to set up and get running.
I think for you it will come down to operating system, original can run on nix, and .net version runs on windows.
There are other automated build utilities that can do this as well, such as TeamCity in the windows space, and cruisecontrol.rb in the ruby world.
Also there is a PowerShell based build utility called pSake that can poll subversion and perform tasks.