I'm totally new to SAPUI5 and after learning the classic Dynpro and developing on the SAP GUI I got a few questions about how SAPUI5 works.
As SAPUI5 is developed in Eclipse I'm interested how it could get data from a SAP NetWeaver table.
Do I need a remote call for that? And how does the Eclipse program connect and communicate with NetWeaver?
I didn't find an answer to that, maybe it's just too simple.
Maybe someone have some tips or best practice to share?
Thank you.
SAPUI5 apps are running inside the user's browser and connect to any server with HTTP. This is actually the very standard way of creating client-side web applications. You can use any kind of HTTP server as long as they offer the data at a URL and offer the data in a well-known format like JSON or XML, but when you have a Netweaver server, Gateway and using OData would be the recommended way to go.
Don't think too much about Eclipse. It is not at all required to develop SAPUI5 applications, it just used to be a well-supported editor with additional plugins in the past. Actually SAP WebIDE would be the best-integrated editor now, but you can still use anything from vim to Notepad.
There are plenty of Gateway/SAPUI5 guides on the web, also the official UI5 documentation contains chapters about getting data from the server with OData. I'd recommend doing the entire walkthrough to any beginner!
You have to write a service (as far as I know preferably using SAP NetWeaver Gateway) to expose whatever data and operations you wish to access from the back-end system.
I'm trying to integrate JBPM with my GWT project and I want to create Process Definitions and Instances, using REST Remote APIs.
For the creation of Project definitions, can I integrate the process modeller from the KIE workbench into my GWT code (something similar to iFrame)? Does JBPM expose any APIs to do that? or is there any GWT component which could render this external component?
I don't want to use iFrame, because according to one of the JBOSS documents I was reading, "The designer opened in stand-alone mode using the link: http://localhost:8080/designer/editor?profile=jbpm&uuid=123456 allows you to only view existing processes, and not save any edits nor create new ones."
This would hold good even if I use the designer using iFrame? How do I make sure that the edits are saved?
Any help will be much appreciated.
There is no API for remote process modelling. However, you can embed various bits of the kie-workbench in your web application using iFrame.
More info can be found here
http://docs.jboss.org/jbpm/v6.3/userguide/ch09.html#wb.Embedding
Embedding Workbench JBPM In Application
I was surfing the Internet where I found an article saying that Alfresco is a Content Management Framework as well as App Development Framework. While I understood it as Content Management Framework, I am not able to know about it as an App Development Framework.I tried researching over it, but could not find anything viable.
I want to know that how Alfresco can be used as an App Development Framework ?
Hi Alfresco has an application development framework, more info here:
Guides: https://community.alfresco.com/community/application-development-framework/pages/get-started
Angular 2 components repository: https://github.com/Alfresco/alfresco-ng2-components
Alfresco App Yeoman generator: https://github.com/Alfresco/generator-ng2-alfresco-app
JavaScript API repository: https://github.com/Alfresco/alfresco-js-api
Some videos:
https://www.youtube.com/watch?v=-OFI3izSDdk
https://www.youtube.com/watch?v=kjOgVbINAyU
In case you want a live support you can use the Gitter channel: https://gitter.im/Alfresco/alfresco-ng2-components
Well, if for App is meant mobile application, Alfresco has a Mobile SDK available for both iOS and Android which can help you create your own application to work against the Alfresco Platform.
Moreover there is another framework called Aikau which has one main goal
The main purpose of Aikau is to provide a library of widgets that can be easily assembled into a web application for accessing an Alfresco repository. The aim is not to replace Share but it was necessary to migrate away from its original implementation, which was based around the Surf paradigms of pages, templates, components and web scripts, towards a solution that provided for rapid development and customization.
This feature was first introduiced in Alfresco 4.2 and then extended in Alfresco 5.0
If you want to build applications for Alfresco you have a number of options available to you - as mentioned you can build mobile applications (and there are SDKs available to do this).
If you want to build web applications then you have the option of either customizing the default Alfresco Share client (which is built on top of the Alfresco Surf framework using a combination of YUI 2 and Aikau). Alternatively you can built your own web client by building a new client with the Maven Aikau Archetype.
The advantage of the Surf framework is that it takes care of Alfresco authentication across all the various APIs (WebScript, CMIS, Public API, etc) as well as providing lots of security benefits (CSRF, XSS white-lists, etc).
The advantage of using Aikau is that it provides a large number of out-of-the-box widgets that are specifically designed to work with Alfresco data and address Alfresco (ECM) specific use cases.
You are of course not limited to these options - you can build an application on top of any stack you wish, but ultimately you will want to be making use of the REST APIs that the Alfresco Repository provides.
Depending upon the application you are building you may also want to build custom data models and build in workflow via Activiti BPM as well.
Can anyone suggest whether "GWT" or "Vaadin" are a better choice to design an application? Also: what are the differences in coding style?
In GWT application logic is normally run on client side. It only calls server when it needs to read/save some data.
In Vaadin application logic is on server side. Client side must normally call server after every user interaction.
GWT advantage:
App logic (replies to user interaction) is faster as it is run locally in the browser. It's also relatively insensitive to bad network conditions. Network is used only when needed (to read/save new data), which saves net traffic (important for high traffic sites).
In this regard Vaadin is slower and introduces a lag in UI interaction which is annoying to user. If network is bad this will show in UI responsiveness.
Vaadin advantage:
App logic is run on the server so it can not be inspected by the user. Arguably (Vaadin claims) that makes it more secure.
A few more points:
A fundamental difference is that in GWT you have to separate your application into Client and Server code, no such distinction in Vaadin. This will affect the architecture of your application.
In GWT client code, you must code in Java, and have a limited subset of language features available (that the GWT compiler can translate into Javascript). In Vaadin, you can code in any JVM language, since everything runs in the server (I'm using Vaadin with Scala). This may or may not be relevant to you.
GWT compilation is VERY slow, although in development mode you have the emulator. This makes production environment updates painful (a GWT application I developed has grown pretty big, and currently takes around 15 minutes to compile).
It's very simple to extend GWT with 3rd party widgets, or roll your own. Creating new Vaadin widgets is more complex.
Another Vaadin advantage: you don't have to design or implement the client-server communication, that's built-in.
With Vaadin you can also use built-in GWT when you want to do something on the client-side. This gives you both simplicity of server-side programming model (no communications, no browser programming needed) with being full control of what happens in the browser.
Differences between Vaadin and GWT:
A) Vaadin includes a server-side development model that:
Cuts number of code lines to half by reducing layers one has to
implement for user interface.
Allows you to use any JVM based language for user interface - Scala,
Groovy
Increases security by keeping user interface logic in the server
Allows synchronous calls to any backend API from the web server
Allows use of any standard Java libraries and tools for UI layer- in
server side architecture applications
Does not need Java to JavaScript compilation step that often takes
time or makes tooling complicated in GWT projects - instead you have
the Vaadin client engine
Provides server push out of the box with no extra code needed
B) Vaadin provides a large set of high level user interface components. For GWT one would need to use commercial Sencha GXT for comparable component set.
C) Vaadin includes SASS based Valo theme engine that makes it easy to build good looking custom themes from your application. Valo is the latest theming for Vaadin.
D) Data binding: Vaadin has incorporated the ability to associate any widget directly to a data source such as database, file or anything else in the server-side. This enables to define default behavior of the widgets to act on data sources.
Vaadin vs GWT
tl;dr
whether "GWT" or "Vaadin" are a better choice to design an application
It is not an “either-or” question.
With Vaadin, you get GWT (or its counterpart, Web Components) plus much more.
Vaadin is a framework for building desktop-style web apps by writing pure Java code on the server-side including declaring a user-interface. That user-interface is rendered in a web browser by Vaadin automatically generating on-the-fly the necessary browser code: HTML, CSS, JavaScript, etc. Business logic executes only on the server-side. User events (buttons clicked, data typed into fields, etc.) on the web client trigger Java code to run on the server side.
How that browser code is generated and executed, and how the client and server communicate, depends on 3rd party technology:
In Vaadin 8 and earlier, GWT
In Vaadin 10 and later, Web Components
Vaadin 8 and earlier uses GWT
Vaadin 8 and earlier was built on top of Google Web Toolkit (GWT). GWT has been spun-out of Google, as a fully open-sourced project: http://www.GWTProject.org/
GWT cross-compiles Java code into standalone JavaScript files. GWT provides other important features such as support of UI components and client-server communications.
The Vaadin Ltd company is a major supporter of GWT, including having hosted GWT developer conferences, and providing consulting expertise services.
Vaadin is only one of many products built on GWT.
Vaadin 10 and later uses Web Components
Vaadin 10 and later, known as Vaadin Flow, is a major rewrite of the framework. Instead of using GWT underneath, Vaadin Flow is built on top of Web Components technology.
Web Components is actually a suite of technologies including Custom Elements, Shadow DOM, and HTML Templates. These technologies are now built into most every modern web browser, and supported on many older browsers via polyfills.
Writing a new widget component for Vaadin is much easier with Web Components than with GWT. And most any existing Web Components based component can be wrapped to provide access via Java from the Vaadin server-side framework.
I don't have a source at hand to cite, but as I recall, Web Components based widgets may run faster and use less memory than their GWT-based equivalents.
By the way, both generations of Vaadin depend on some other technology, such as the Atmosphere library for help with WebSocket and HTTP.
I haven't tried Vaadin. I'm a GWT fan, but I CAN say that I've been a bit disappointed by the default widget set provided with GWT. You really need something like SmartGWT to fill the framework out.
I belive Vaadin is a much more advanced framework than GWT
BUT
When it comes to optimise performance on the client side there is nothing much you can do unless you build your own components (and that's where the beauty of Vaadin stops)
In a project i'm working right now 90% of the staff I've done worked as a charm
And then I had to use an event timeline next to a couple of tables. When I loaded more than 400events on the timeline my web page was almost unusable not to mention terrible slow on initialisation. I've been trying to optimise the code the last two months. At the end I used a GWT component.
As any application has to show display information coming from the server, a major requirement for simple coding is automated data binding to your forms and tables.
With Vaadin, this is as simple as a few lines of code.
In GWT, first you have no table mapping.
As for forms, you can map an object to a form, but to do so you have to implement a so called GWT Editor for your object (and one for every object inside of it). An Editor is nothing else than the definition of the form to use to show/modify the object. So all in all, there is no automation here.
GWT enables you to write web-clients with Java. The GWT cross-compiler creates JavaScript code for the client-side. You have to care for the server for your own as well as client-server communication. The generated client-code is already optimized for many browsers. My personal opinion is, GWT was very popular until Google focused on Angular. Today it is not much popular anymore.
Vaadin provides two different solutions:
1) a UI widget-set based implementing the web-component standard, and
2) the Vaadin serverside Java framework. It allows you to write web-clients with Java. However, Vaadin generates the web-client through runtime on the server dynamically. Vaadin cares for the entire client-server communication. For rendering the UI, Vaadin until version 8 used a pre-compiled UI widget-set. Vaadin from version 10 uses the Vaadin web-components.
Further benefits of Vaadin:
You do not get in contact with HTML and JavaScript and you need not bother for DOM manipulation, browser history and other low-level problems
The serverside architecture provides better security
Modern themes
Individual styling with CSS
RapidClipse provides a powerful UI builder for Vaadin based on Eclipse containing a Vaadin <> JPA databinding, internationalization, UI persistence, extended Hibernate tools, JPA-SQL query language and MicroStream integration for creating Java in-memory database apps and microservices
Is there a mechanism to dynamically load a GWT Module?
The idea is to create a pluggable GWT-based system: a core GWT module that dynamically loads another GWT module and a bus communication system to permit the communication through loaded modules.
Any help?
Possible duplicate of Web Application using OSGi and GWT
Also, see the information in this GWT User forum thread - http://groups.google.com/group/google-web-toolkit/msg/4a3f912cb89a7256
To summarize, its possible, but not recommended. Your requirement is orthogonal to GWT's philosophy and architecture. If you must, the GWT Exporter project is a useful starting point to enable communication between modules.
Code splitting does successfully handle the separated-loading issue -- but it does not address the separated-compilation issue.
Modular-interoperability with separated-compilation will never be the recommended default but GWT team should look into this in future.
If we are talking about a plug-in based architecture, different plug-in developer should develop their own UI and compile and give to the framework. Framework should dynamically load them.
I am still looking for and way to do it (do it better way).
You can use code splitting to dynamically loading the code when ever you want.
Have a look
http://code.google.com/webtoolkit/doc/latest/DevGuideCodeSplitting.html
See also comments at http://code.google.com/p/google-web-toolkit/wiki/CodeSplitting, starting at 6th comment.