I have a complete and pure Java project (GUI game) which I want to run it on my website.
What is the best to do without creating the whole java project from scratch or is there any technologies I can use to embedded my java project on my website.
I know it became more difficult to do this as most broswer do not support java anymore. I know there is a way to do using Java Web Application using Apache Tomcat, but I do not want to do route. I am trying to find more easier and better to solution to this
Thank you
Unfortunately, It is quite possible that you need to rewrite some parts of your application. Mainly because it is a different language (I assume SWING, AWT, or another Java-based library, but you could tell more about your project and used libraries).
There is usually two parts of a game/application (super simplified):
backend,
frontend,
I am quite sure you can use most of your backend code. But the frontend probably needs to be rewritten. It is even better if you loosely coupled those two parts meaning there is no code in the backend for the frontend because you will have a harder time now breaking it down.
For example, you could check Vaadin and see what you could use from there to refactor your GUI application to be work on a plain browser.
Vaadin basically lets you write only or MOSTLY Java code and still create a website, webpage.
Good luck!
p.s: Next time I recommend you (if you wanna publish it to a different platform) a cross-platform language, you write once and you can run it publish it on multiple platforms.
tl;dr: Is Spring + Django back-end possible?
When I was new to industry and was still working my way around the office, I got interested in Django and created a very small, basic-level application using the framework. When I got to meet my team after a few weeks, they said to go for Spring framework. After spending half a year on the framework and the main proj, I finally started to get time to start working off-hours. But, I don't want to lose both the skills - My teammate(when we were still in office ;) ) once told me that they worked on a project that started with python code, and then later added features using Java. And I am unable to find any helpful google searches(mostly showing Spring vs Django).
How should I go about it? Is it too much to ask for? Is it worthwhile? Will I learn some new concepts of application architecture a noob like me would have missed. Please provide me with some insight.
Are there resources(docs) I can go through?
P.S. I'm not a diehard fan of either of the frameworks right now, just another coder testing waters.
You can't write java in python.
You can extend Python with C/C++ which is quite common: Extending Python with C or C++
And about the part that they told that they added features with java:
It's common to create different parts of a project using different languages and tools. Microservice architecture is a common architecture for these kinds of use cases. You basically code different parts of the project in a language you want and then you connect all the parts using different methods like REST APIs, gRPC and etc.
Imagine you are creating a website like youtube that lets others upload videos. There is a form that users upload their files and you store them in your storage and then you have to encode the video file for different qualities. You can code the form handler using Python and Django to store the files in your storage. Then you can code another service using java that handles the encoding part which is a heavy process. When an upload is completed, you send the file or file path to your java service using an internal REST API and tell the service to start encoding the video and notify the Django service and then the Django service will publish the video on the feed that can itself be written in another language.
I would say go for 1 framework and stick with it. For example Django if you want to code in python, and spring if you want to code in java. Learning both frameworks however brings a lot of value, because you can compare their benefits (eg. spring forces you to write clean code, django has build-in and simpler database management)
I like Django's build-in tooling a lot, you only need to know python for it to work. Spring requires a bit more knowledge of eg. hibernate for database management. However I predict Django will outgrow spring at some point, because of cloud valuing fast iteration over code and quick startup time (auto-scaling apps) over large overhead apps and long boot times. Hoever, if you like java, I can recommend JHipster for java/spring webapp development to get up to speed very fast and learning the ways of REST CRUD api fast.
To combine 2 programs: write your main logic in one app, and write a small service in the second language, making sure its independent of the first app (no back and forth communication and complicated logic, but simple independent request/response, as if the main app was never there). Add a REST api to the second app and use eg. http requests to communicate.
What's possible in terms of combining languages:
connect different applications with each other: by letting them communicate through their APIs. For example a python api developed with flask or django can send requests to a java api developed with spring, as long as they have a way to communicate (eg over http, or via some queue like rabbitmq)
connect a webapp to 2 different backends: by using a shared authentication system: For example a keycloak authentication server to handle tokens, that your backend applications know about.
What's not possible (and also not preferable):
combining java with python code in the same program: there are some hacky ways to get it to work, but its asking for trouble and not readable.
Introduction
I am basically coming from two sides of the development teams. I started building web applications using PHP. This way, I had to implement everything by hand. Forms, graphical elements, how everything is tied together (i.e. what happens when you click a button).
On the other hand, some time ago I entered the Java Web world, namely JSF. Which is in my opinion a nice way to build a "serious" applications. (why I think so, read below)
Problem
I would like to build a web app that is made of a nice and useable frontend that is designed after my specifications (basically doing the HTML and graphical layout as a horizontal prototype first - as far as possible -, then make a complete webapp out of it). But on the other hand I would like to do all the business logic in Java because of its many nice frameworks out there - Hibernate, Morphia, Lombok, Dozer, just to name a few I met and fell in love with.
I could build the frontend with JSF myself but I still think, that I'm too limited because I have to use the built-in components that can only be customized to a certain amount. What if I want to use my own design patterns and UI elements and behavior but still want them to work together with a Java "backend"?
What would be the "best" choice of tools to achieve my goal? Choose a different web framework like Wicket or similar?
My idea: Build a web application in Java that understands the good old GET commands and translates it to the Java methods. Sort of a RESTful service - although I'm not a great fan of making everything RESTful in the frontend - unless you tell me, that's fine and reliable.
Have you considered / looked at Google Web Toolkit for what you're trying to craft?
GWT is Java behind the scenes yet still can get you where you want to go, if I understand what you're asking.
Just an update:
If GWT isn't your thing, take a look at the Groovy / Grails route.
Just some elaboration here based on a comment...
With Groovy/Grails you don't actually have to merge your front and back end. I have seen that done, but its not necessarily always 100% required.
For example, you could create a web app in Grails where your AJAX functions could be formed and stored with the UI code being delivered out to the client for Great-UI-Justice. For added fun, you can even instruct Grails to include a JS framework such as jQuery to help you out with the UI.
Now on the back end, you should be able to take your Java back end and apply it directly with little to no change. However, I would recommend looking into adjusting anything you've done so far to take advantage of the Grails methodology.
There are many JSF libraries like ICEfaces,
RICHfaces etc, that make use of things like AJAX, etc.
In my personal opinion it's always a good idea to have a RESTful API and treat your web page just like any other client ;)
I know this question might be repeated many times but would really appreciate any suggestions. I am working on developing a web application in java (server side). The client is developed in javascript and html5 (another guy) and i want to make the developement independent. I have been using java for quite long but have no experience in web development. After endlessly going thorugh many forums and articles i am so confused.
The web app is pretty simple one with options for user to login and upload some data and access those later.
I started with basic sevlets and JDBC APIs. The web application is not very complex one
Currently i have servlets for each resource to handle post and get call on them.
The suggestion i am looking for is do i need to use some framework to make it better. There are so many like springs, playframework, wicket etc.
Any link to sample web applications developed just usin servlets apis will also do a great deal to me
Thanks in advance for the suggestions
I don't think you need any framework. As you said your app was pretty simple one. A java Framework could make a complex app organized. But would make a simple app complex.
However, if in the future, you want to extend your app further more. you might need a framework. The most famous web frameworks in java are SSH(spring, struts, hibernate), you can find a lot of materials easily, so I won't dive into the detail here. SSH frameworks are not easy, avoid using them if you app is not complex enough.
Sorry for asking this question, but I searched all Java-related questions, but I got more confused. I am still not clear what should I start with.
My main thing is building websites in Java, because someone told me that there are some machine learning or AI libraries available in Java which I can use in Java. So I decided to use that as it can reduce my work.
Now I don't know Java at all. Some people say the following are used to build websites, like:
Servlets alone can build a website
JSP alone can also build a website
Struts
Spring Framework with Hibernate
Seam
Java EE also for websites
I am confused. Where should I start from? Where does core Java fits in here?
I was thinking of perhaps learning Python as I know I have to learn Python only, not its variations.
So please guide me to one thing which can solve my basic purpose of using ready-made libraries of AI.
If I can do that with JSP then I will start with that.
But if I need to learn all of them, then it’s better if can start learning Python.
I have five months to finish the website.
I really don't know why there are many branches of Java for doing one thing.
To correct some misconceptions of yours:
servlets and JSP are Java EE
Seam and Struts can be used together with Hibernate as well
Spring MVC is a web framework. Spring as a dependency injection framework can be used together with any other framework.
there are many more options, like JSF, Tapestry, Click, Play, etc.
It depends on what will the site will be doing, but you can choose any.
Experience has shown that building complex HTML forms (especially validation) and Ajax functionality is hard to get right. You will most likely appreciate having a library to assist you with that. The same thing with database access.
Everything builds on servlets. Learn those in order to understand the libraries you will use.
I would suggest learning JavaServer Faces (JSF) with facelets. The easiest, while being powerful, is JSF 2 in Java EE 6. The easiest way to get started is to use NetBeans with GlassFish 3.
For static web pages, HTML alone is enough and if you want to make it more user-friendly and interactive, use JavaScript.
There are lot of frameworks you can use directly in JavaScript, like jQuery. Now if you want to make some more functionalities, like database interaction, then you will need either PHP, Java (JSP and Servlets) or .NET (there exist some more, but I’m aware of three only). Each of them have their library to interact with database.
Since you are interested in Java, go through Servlets, HTML, JavaScript, and JSP. Once this is done, you can look into JSF and EJB beans. So if you have knowledge of Java this will not take too much time, because the syntax is the same; the only difference is the concept.
So you will have a frontend (HTML, JS, and JSP) which will interact with the backend (Servlets and the database) which will be deployed in a Web container. To deploy, you can use an one of the available application servers, like Apache Tomcat, GlassFish, or WebSphere. To develop your application, you can use Eclipse as the IDE, which is one of the best IDEs I have used.
So decide your architecture and design, break it into components and start writing small applications first. Once you are experienced in small application, start writing an application where there are more things you have to care of, like load on database, availability, security, etc. For that, you can refer a very famous question on Stack Overflow, What technical details should a programmer of a web application consider before making the site public?.
The closest to core Java is servlets. No extra syntax, very minimal library, but no included functionality.
For building websites, the main thing is HTML and HTTP.
All technologies (including Enterprise Java or Server side Java) do the same—to understand an HTTP request and respond back with HTML. All that you mentioned do the same thing with a different level of sophistication.
Start with Wikipedia.org to know what technologies do what. If you are completely new to Java, go through the Sun tutorials, do sample programs, and get comfortable with Java packages, JVM and classes. (This might take a week or two).
To build websites using Java, you'll have to learn Java Servlets—everything else (JSP, Struts, JSF, and Spring(!)) are built on it. Get Head First books on Java and Servlets; they will be useful.
You can always build the page in Ruby or something that will give you a website very fast. For the AI stuff that analyzes the bought items for the recommendations, use something unrelated to the page that only takes the database to work with.
I would not mix the whole web page stuff with the AI computing. You can do the AI things that will take a long time and maybe should done on a different machine to have your webpage also responsive with C++ or Java in normal applications.
Choosing your front end technique because of later usage is a very dangerous thing. Using the whole Java EE concept and learning it from scratch will take you much longer than have a quick start with your page if you do it in Ruby or PHP.
You can then build the first version of the page and generate a user base. Start working on the AI stuff once you got some data with other technologies.
If your page has performance problems because your technology does not scale, you can always begin switching parts of the stuff out with a faster technology or maybe simply a bigger machine. Get your page running before you build it bulletproof for the thousand users you are expecting.
If you’re trying to build a website from scratch, with no prior knowledge, your best bet is to go with frameworks that provide a complete stack for web development.
If you aren't dead set on Java, you could probably start learning Ruby on Rails, which would be easier to start with (if so, go buy a Ruby on Rails tutorial which goes through all the necessary things for modern web development, from MVC to version control).
For Java, try:
Play Framework is very similar to Ruby on Rails. It will get you started very quickly, and hopefully (if you follow conventions) handle all of your peripheral needs.
Spring Roo is a very-fast-to-work-with framework, but it might get hard to maintain and extend later on.
These two are full web frameworks, that is, they handle database, MVC (presentation layer), configuration setting, etc... (I'll explain shortly). And could even ease your deployment process.
If you're going to go through any other route (using several frameworks together), you are probably not going to finish what you are doing in five months.
To understand why, and to clear some things you wrote in your question, you need to understand that modern web development (and enterprise development as a whole) is comprised of several different technologies:
Presentation: the term web frameworks has been more or less taken to mean frameworks that deal with this side of web development, i.e., how to create a web page (an HTML page). Most of the frameworks offer an MVC like approach (which you can read about elsewhere), and this is what most of the frameworks/technologies you gave sit in—JSP and Struts (which uses JSP) are examples of web frameworks. Servlets is a lower-level API that standardizes how to answer HTTP requests (which JSP and Struts sit on top of).
Persistence: being able to show a webpage doesn't mean squat these days if you can't save data to a database, and that is what the persistence frameworks do (they ease the way you can save data to the database). Hibernate is a persistence framework.
For Java there are also dependency injection (DI), which is what Spring DI is. It's tough to explain DI to people not familiar with the troubles of Java, so I won't try to explain it, but it's a very important part of modern Java development.
apart from these core technologies, there are also many items that you'll need to learn to actually deploy the application (unless your using services like Heroku or Google App Engine, which should simplify things), and troubleshoot it later (understanding how concurrency and HTTP works).
To address the other technologies you brought up:
I've never really touched Seam, so I'm not sure, but it looks like a collection of other frameworks (mainly EJB 3, which itself is a collection of APIs, and JSF).
Spring denotes a popular open source group (the SpringSource group) that provides various technologies, but most likely when you hear about it they refer to two things Spring's dependency injection (DI) and Spring's MVC (which is a web framework).
Java EE is merely a collection of high level APIs which other technologies implement (Hibernate implements JPA which is part of Java EE for instance).