I have a Java project where I will need to create an application to manage calendering events and tasks. This application be part of a larger project and will need to implement pretty specific functionality. At it's heart though, it will have events with dates, reminders, alarms, to-do lists with deadlines. It will also need to share events between different users and groups.
It seems to me that the core functions of this system must be something that has been pretty much solved, and I am wondering if there is a java system / library that implements it?
I have looked into the following :
- bedework : seems to implement everything I need, and a lot more. I have looked into it, but it does not seem like the source code is documented or that the core functions are made to be integrated into an other project ( I do not need their web interface or the extra features )
- cosmo : seems abandonned
- Oracle Calendar Server : Does not seem to be open source
- Milton IO seems like something I would use if I wanted to support CalDav, but I still need to implement the calendar back end
Pointers? Solutions? Recommendations?
Related
I am working on IBM RTC and I need to import a .csv file to RTC using JAVA. Is there a way to do this? If yes, can someone help me with the same.
Parsing CSV data is something that you definitely do not want to implement yourself, there are plenty of libraries for that (see here).
RTC offers a wide range of APIs that can be used with, see:
rsjazz.wordpress.com or
jazz.net
In that sense: you can write Java code that reads CSV data, and RTC has a rich API that allows you push "content" into the system.
But a word of warning: I used that java API some years ago to manipulate information within our RTC instance. That was a very painful experience. I found the APIs to be badly documented and extremely hard to use. It took me several days to come to working code that would make just a few small updates to our stories/tasks.
Maybe things have improved since then, but be prepared for, as said ... a painful experience.
EDIT, regarding your comment on "other options":
Well, I dont see them: you want to push data you have in CSV into your RTC instance. So, if you still want to do that, you have to use that means that are available to you! And don't let my words discourage you. A) it was some time back when I did my programming with RTC, so maybe their APIs are better structured and more intuitive today. B) there is some documentation out there (for example here). And I think everybody can register at jazz.net; so when you have further, specific questions, you might find "better" answers there!
All I wanted to say was: I know that other products such as jenkins or sonarqube have great APIs; and you work with that, all nice, easy, fun. You get things working with RTC, too. Just the path there, maybe isnt that nice and easy.
My personal recommendation: start with the RTC part first. Meaning: just try to write a small programm that authenticates against the server; and then push some example data into the system. If that works nicely for you; then spend the time on pulling / transforming the real data that you have in mind!
I am working on my bachelor thesis (this is my first research project) and trying to evaluate different possibilites to monitor a developers work during a day, aggregate it and illustrate it later. For this purpose, I defined some metrics, I want to measure (they might change over time and there might come more).
My questions are related to the monitors. To start, I have decided to monitor the developers work (only) within Eclipse (and add a TFS implementation later):
Work Items: I want to know how many work items the developer solved, edited and created. If possible, I want to access the data from MyLin, because multiple different task/bug-trackers can be used (Bugzilla, Mantis, etc.). Unfortunately, I am not sure, if this is possible somehow?
IDE-stuff: (To start), I want to count the number of selects and edits in the code and probably also the number of clicks a developer made within the IDE. I read, that I can create listeners on Eclipse and get the data. Is this right and does anyone know a nice tutorial on that topic?
Source Code Management: To track a developers work, I need to get the developers source code changes (commits). For SVN, GIT and CVS, there are multiple APIs, which I may access with Java or also via webrequests. But before I start that, I wanted to ask you, if someone knows a plug-in or something where I can access the commits from different version control systems? What is the easiest way to do something like that?
I also have a couple of other things, I am going to measure... My aim is to aggregate the data within an Eclipse plugin and then send it the server for the visualisation.
I am not necessarily looking for fully implemented solutions, but more for hints, tutorials, tips, your opinions and probably also questions and propositions!
thank you!
You can try out with rabbit plugins for eclipse to track the time spent on it. It has different trackers to record the statistics about different commands executed, duration of the perspective or views used, time spent on editors etc.. And this plugins has a view to see all the statistics collected. have a look at the following link:
http://code.google.com/p/rabbit-eclipse/
Some of the metrics you want are produced by Hudson/Jenkins plugins as a starting point you could look at how those plugins produce those metrics. Same applies for the Eclipse metrics find existing plugins which manipulate or consume some of the metrics you want and use that as a starting point - since most of them are OpenSource.
I'm developing an application for Android, and I'm thinking that it's functionality might be useful on other (Java-running) platforms (say a regular desktop app -- although I hope that the other platform(s) involved are immaterial to the question at hand).
It's unlikely that the UI will be in any way portable (there's just too much of a difference between a good touch-capable, 4in screen UI, and a mouse-and-keyboard 19in screen UI), so I'm happy enough reimplementing that separately.
However, the core "business logic" (ugh, horrid word) and model (data storage) classes could, in theory, be reused in managing the core app. I've noticed that there aren't a lot of classes I'm writing that don't end up referencing some Android-specific bits (I've got XML resources files, images, and SQLite databases, as examples). Basically everything I've written so far has at least one Android-related import.
My question is twofold:
What tools are available out there to help me use Android-related classes and features (eg resources, databases) on non-Android platforms; and
What classes, features, etc of the Android platform should I completely avoid using (for the sake of simplicity, let's exclude UI-related items) due to non-portability, and what should I use instead to improve portability.
Answers that consist of "hahahaha, you're doomed" are OK, as long as there's some rationale provided.
(P.S. I'd make this community wiki if that was still available; this seems like a perfect CW question to me -- a list of Android portability tips and tools)
Looks like you have already identified the key point by keeping UI and biz logic / model separate.
Also sqlite itself is used not only in Android. But of course the way you interact with it (e.g. SQLDBOpenHelper) is different again.
So I guess having the biz logic and model as separate as possible is the way to go.
You can then put a wrapper around it (e.g. "Data Access Object " pattern which talks to the specific DB).
Still keep in mind that the users experience is best when you are as specific to a platform as possible on the UI side.
Example: there is an App (Push & Ride) on the Android market, which seems to run in a J2ME emulator. So screen input does not use the normal soft (or hard) keyboard of the device, but a simulated phone keyboard with the "abc" "def" combos on the number keys, which makes data entry a bit strange.
This app is for sure very portable (and its functionality is really great), but it just does not feel right.
When you want to go multi-platform, you may perhaps also look at things like Appcelerator or Adobe AIR
I started off doing something similar - I wanted to write an app for Android, Blackberry and J2ME. Conceptually, you can layer your design such that platform-specific components (UI, network access, data storage) are separated from the core business logic.
In practice, I don't find this satisfactory. The issues I faced all related to the core version of Java being different in the different platforms (in Blackberry it is based on J2Se 1.4, while Android used Java 6 as base). This led to annoyances like
Not able to reuse code that uses generics
My preferred classes not being available uniformly (for example, forced to use Vector over List)
I have opened discussions regarding this on SO (here and here), but couldn't reach a conclusion.
The logging layer can be made portable by using the Simple Logging Facade for Java(SLF4J) which is available for java/log4j and for android.
Also,you can try this out
http://wp7mapping.interoperabilitybridges.com/Home/Library?source=Android
Contains documentation and tools to map your android app to windows phone
Also read this,even though it contains instructions specific to android - windows phone interop,im sure they apply to other platforms as well
http://windowsphone.interoperabilitybridges.com/media/49652/wp7_guide_for_android_application_developers.pdf
What I do is create a web service outside of the android app which can be used by the android app as well as other systems (websites, windows apps, iphone apps etc).
A simple REST web service which supports JSON is a good example to fetch data and also insert/update data. JSON is particularly suitable because its so lightweight, and doesn't require alot of bandwidth which is great for slow mobile connections.
This way you can store your models/data storage outside of the android app, and it can be used by other apps very easily.
The database layer can be made more portable by using android jdbc or by using a database abstraction layer/object relational mapper/ActiveRecord implementation.
Has anyone tried make android.database(.sqlite) runnable on a non android system?
If you carefully separate business logic from UI and android perks you would be able to reuse it in desktop environment. Android is quite different from it in intialisation and application lifecycle - abstracting creation and setup of BL is also necessary.
Usefull pattern for this purpose would be dependency injection. There are different frameworks around, and some are more suited for android (like roboguice) or desktop (spring or picocontainer or guice).
Android appliactions are very constrained in memory, and this puts limits on what frameworks you can use there. So you may need to abstract data storage as well ( hibernate comes handy on desktop / server side , but too heavy for mobile device)
I'm inclined to suggest trying out the new native extensions for Adobe Air. It allows you to create a device-specific chunk of native code, and connect it to the Air framework, accessing it as you would other objects in Air. (cf. http://www.adobe.com/devnet/air/articles/extending-air.html). This allows you to keep the Android-only code as is, and then replace that code with iOS, Windows DLL, etc. code as needed.
This doesn't solve the problem of translating Java code to other languages/platforms, of course. Still, some of the logic you are doing natively may very well exist already cross-platform in Air. For example, you can access the camera in Air in all supported OSes without writing any device-specific code.
You will probably need to go beyond the current Air classes, so some examples may help:
Android speech-recognition
iOS batttery
Windows and Mac tutorial
NE tutorial
I am currently trying to implement a database compatibility layer for Spring-Boot-JPA/Android-Room:
"compatibility layer" means my Service-layer-code is pure-non-android-code that can be used in android and in spring-boot. The Service-layer-code uses a common java-repository-interface that is either implemented in android-room or in JPA.
Currently i am stuck here:
Howto use methods of CrudRepository<T, ID> (or SimpleJpaRepository<T, ID>) in a Spring-Data-Repository-Fragment method?
I've tried searching for similar questions here and I don't think I've found anything that matches what I'm looking for. I would like to know where to start in developing a (most likely) database-driven Java application that could keep track of customers, invoices, and quotes for my dad's auto shop. There will be a couple computers in the shop that will need access to it.
I was thinking of having a server in there to handle the database and let whatever machines need to access it use a client app.
Almost all of my experience is in a LAMP environment but I have been trying to learn as much as I can about Java and feel pretty comfortable playing with it in Netbeans or Eclipse.
I'm not asking anyone to tell me how to make it or anything. I would just like to know where to start learning. Is MySQL a good match with Java or should I use something else? I've been wanting to learn Java and I figured this would be a good project to learn on but everything I read seems to give only bits and pieces of what I want to know.
Java and MySQL work well together. Here are some things I would recommend to get started:
JDBC (Java Database Connector) - use it to connect to MySQL
Swing programming - used to create the GUI front end that users will interact with. While NetBeans has a drag and drop GUI builder interface, actually understanding what's going on under the hood is very important.
GlazedLists is a great project for showing dynamic content in table format, such that you can easily filter, sort, etc. Given you will probably have table views of customers, etc., I would look into this
If I were you I would definitely set the bar a little bit lower and try some easier projects to start with (ones that do not require database connectivity, for instance). Once you're a little more advanced with Java, then I'd start work integrating a MySQL table with your app.
I think that most of the answers to this question will prove useful as a starting point
You'll never find a complete subject list to learn java or any other tecnology, I suggest that you should start by writing down the requirements for the project and start "trying/failing" at what you want to do. Bits and Pieces are a very good way to learn.
You could try building different test applications, to get the feel of java, and slowly start using all parts needed to build your application. Common concepts used in small database-driven Java applications are:
JDBC, a java database connector
A client/server architecture (needed if multiple clients need to keep their data synchronized)
Synchronization
A swing GUI
A learning path that worked for me was:
Build a command-line driven java application
Build a test application with a graphical user interface (GUI).
Build a test application with a client/server architecture, but with only one client
Build a test application with a client/server architecture, connect multiple clients and keep them synchronized.
Build a java application with a JDBC database connector, set up a MySQL server and connect the server in your client/server architecture to it.
You can search for each of the concepts on the internet. It should be easy to find tutorials that will teach you how to use them.
MySQL should work well with Java.
In any case, if you use JDBC (a generic API to access SQL databases, part of the standard Java library), you should be quite independent of what underlying database you are using (apart from vendor-specific SQL extensions).
Does anyone have links and resources to connect to an AS400 from Java?
I remember years ago, somebody told me about a connector that simulates KeyStrokes from the keyboard and other "purest" approach that connected directly.
On the web I have found a lot of links, but I cannot find a complete product to do this (I am probably not using the right keywords).
EDIT
Thanks for the answers:
What we are looking for is a way to access the data inside the AS400 and/or the screens it uses and expose them for other new applications re-use. Either as a webservice of some sort, or directly through Java ( and java will expose the operations using webservices )
Thanks in advance.
EDIT
As per MicSim post, I've also found this link:
http://www.ibm.com/developerworks/library/ws-as400/index.html
What you are looking for is probably the Toolbox for Java™ & JTOpen from IBM. There is also an AS400 class in the toolbox for performing specific AS400 tasks. You can look here and here for more details. Just googled it and hope it's helpful.
IBM's 5250 screen-scraping technology was "WebFacing" - I would post a link but you're probably better off Googling it, since IBM's documentation is so scattered. There are other technologies available too but: Screen-scraping was never anyone's favourite since typically you end up with something which, although it looks more up-to-date, actually is harder to use than a green screen and no more functional. The 5250 is probably the single best data entry platform I've ever used - web forms in a browser are one of the worst.
As mentioned, jt400 is the way to go for most other things. In particular:
JDBC - for all things SQL. If you do it right and address your files as though they really are tables, it's a way to get away from the 400 entirely.
Record-level access - write Java programs using a similar database API to RPGLE (all those chains, setlls that 400 programmers love)
Call programs, system commands, manage resources (data queues, data areas, prints / spools, jobs etc etc)
Good luck
If you just want to run Java on the AS/400 (or iSeries, or System i, or whatever IBM's marketing department has decided to call it this month), that's a supported language. You can access the pseudo-DB2 database directly. Or are you after some other form of integration?
This obviously depends on what you want to do, however if you want to simulate keystrokes across a network connection to an AS400 process then Expect4j may be the library you are looking for.
This is generally a really nasty hack though and there are frequently better ways to achieve your goals. What are you trying to do?
The expect4J library can be found here. Expect was originally a unix command that allowed you to specify a string that you are expecting to see and then a string of characters to return. It was frequently used for automating logins etc and for screen-scraping applications.
Even better is the TN5250j Console, which can be used to extract data from the AS/400.
jacada makes tools to do what your looking for
http://www.jacada.com/