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Replacement for GWT [closed]

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I built an application using GWT in 2012 and it has worked fine until now when a major functionality upgrade is required.
I used GWT because my background is Java and having worked in MVP type projects prior to that it was a good fit.
Today, any problem I encounter and do a google search for has answers that are posted 2 to 3 years ago ( and in a lot of cases don't solve my own issues ) This is telling me that GWT is being left behind.
Because I built the app primarly as a hobby to learn GWT I feel like I would like to learn a more recent framework when rebuilding my application.
So to narrow it down, I want to know if there is any suitable more recent alternative to GWT out there that still allows me to code in Java.
I understand this may seem like a broad question where answers will be mainly based on opinion but how else can you pick peoples brains except asking "What is your opinion" How do I do a,b,c using Java is going to be answered 3 different ways by 3 different people based on their opinion of how it should be done.

I have heard about Vaadin (https://vaadin.com/home)
Vaadin is a covering around GWT giving you more flexibility to work and the same time maintaining the GWT like experience.
Otherwise this is a good compilation, you could pick what you might need:
https://github.com/jashkenas/coffeescript/wiki/List-of-languages-that-compile-to-JS

As a long time GWT user I am increasingly drawn to AngularJS. Obviously we're talking JavaScript rather than Java here, but coming from a Java background myself I'm finding JavaScript with AngularJS a decent alternative to GWT.

Check OpenXava it's easy to use. http://www.openxava.org/ate/gwt-alternative

There is nothing wrong with GWT per se. Polyglot programming has real costs and there is plenty of activity e.g. on gitter. https://gitter.im/gwtproject/gwt
New users can use https://github.com/gwtboot to get started and there are modern ui kits like https://dominokit.github.io/domino-ui-demo/index.html?theme=indigo#home
Since you still want to code in Java and want to learn something new, i would suggest using "modern GWT", i.e. using elemental2 / j2cl. You should consider learning to refactor your app to separate your view layer from the underlying ui framework. Avoid the parts that will go away in GWT 3.0 such as RequestFactory

JSF? http://en.wikipedia.org/wiki/JavaServer_Faces
It's the "official" (part of Java EE) framework for Java web apps. I've used it briefly in the past and was relatively happy with it. I very much prefer it over other frameworks that still rely on JSPs.

cuba-platform if you are looking for ready made components and Web Firm Framework if you are looking for a framework which can be used to build any UI component. Both are java frameworks to build web ui.

I would recommend learning either Swing or JavaFX.
Swing has been arround since Java 1.2 and is the more "mature" one.
javaFX is their new "hip" version and was introduced into the JDK at version 7.
Personally I'd go for JavaFX just to be "future-proof".

Starting new Android application [closed]

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I am about to start new Android app considering that Java development is not my strongest side I'd like some advice on where to start. The question is not that much about Android API it's more about the right tools and code organisation.
Should I use template app like Android Bootstrap and are there any other better than that.
How should I organize my code so it makes sense while the app grow.
Any other libraries that might help?
The app would be for downloading music and it'd be free one. There would be a server API that will deliver the content.

In my opinion you should start with a blank project and try to learn Java and understand how the classes in Android work. Using a template is not the best way to learn programming because you can easily get confused and not understand what the code does.
You implement the classic 3-Tier architecture with packages for the Domain, Repository, Controller and User Interface. This way you can stay organized and easily improve on your app.
Read Android forums, documentation and see what libraries do you need to use.

Firstly get stronger on Java development, go through the Java SE tutorial. Then you can take a look at the Android Development Getting Started page.
I'd also recommend you to invest on some good programming book

Best Java Frameworks for learning [closed]

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What would be a good Java framework to explore for someone looking to learn? I've played around with the Android api but had someone ask what other frameworks I had experience with so I thought I should spend some time working with another. What's the best bang for my time?

There are many java frameworks but we can categorize two parts.
Standard Frameworks
JSF
JSP & Servlets
JPA
EJB
Non Standard Frameworks
Spring
Strut
Wicket
GWT
Hibernate
Seam
Play
Others

For web frameworks i suggest : Spring, Hibernate, Struts, Primefaces (cool stuff) .

It really depends on what it is you're trying to gain experience with. If you are looking for web frameworks, gaspyr named some decent ones you should try (I've worked with Spring myself). If you are looking to develop just desktop applications or embedded solutions, I would just go with tackling the standard JRE, and take special note on how the differences between how applications, applets, and servlets run. It's always good to know about the underlying libraries themselves rather than just understanding the syntax and attempting to use a framework to solve all problems without understanding how they might work under the hood.
But this is a really open ended question, and it's difficult to know exactly what you're looking for and why.

Framework choice depends on many factors and good documentation is not the least.
There is incredible book "Spring in Action" if you will decide to start with Spring.

What Java REST framework to use with App Engine and Android for students? [closed]

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I'm teaching a college course on mobile application development and would like to introduce my students to a REST framework for use with App Engine, to help them with data storage for the Android apps they're building. Could anyone recommend a Java REST framework for App Engine that meets the following criteria:
Must have:
Easy learning curve
Well-documented, with clear tutorials and sample programs
Clean abstractions
Free as in beer
Works well with Eclipse
Nice to have:
Android client
Free as in speech
Not important:
Able to support large query volumes
Highly customizable
From my web searching, Restlet looks best. Is there any other framework I should consider?

Well, I would highly recommend play framework
Have a look at the video on the homepage
It has a gae module
With siena as a orm to handle gae datastore
From all the java frameworks I've seen so far, I think it has the easier learning curve,
great documentation,
a tutorial to develop a complete application
very active and helpful community
free as in beer and also as in speech
highly scalable due to it's stateless out of the box design
rest friendly
highly customizable via it's modules and plugin approach
more over, taking into account it's for a college course, it's really easy to hack into the code, I could handle a couple of tickets and new features without any experience at all with java, just a couple of year developing web applications with php
other benefits
it's really easy to start, no complicated setup involved, just download and unzip the file and your are ready
great development experience, just fix the code and hit refresh, play autocompiles changes on the fly when running on development mode
fast and lightweight
fullstack, you don't have integrate cumbersome frameworks to make it work
great errors report, no more endless error stack trace, just shows you the line with error
no xml configuration anywhere around
great support for tdd with selenium integrated test
I think the main advantage as a learning tool, is that it's possible to peek into the source code without feeling lost and the community support... The documentation is very clear, and you can learn a lot by just having a look at the source code...

Jax-RS...Restlet was written before this but was modified to implement Jax-RS.
This is a similar answer you might find useful.

Could you take a look Spring framework?
i think it may be contented with your request.

What is the best Java SIP Stack around? [closed]

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What is the best Java SIP Stack I can use.
I'm looking for Stable, Efficient, Rich Feature-Set, Stable & Bug-less :)

MjSip - complete, well documented, and Open Source

I hope it is NOT MjSip. I may be wrong but I don't think that the api has been worked on since 2005. I have used it for a month now and it is missing some higher level things like easy dtmf support and has the occasional bug. Although, I think some decent projects like SipDroid for android used it as a basis.
Two other stacks I know of are:
1) PJSIP-JNI which is java bindings for the C PJSIP library
2) JAIN-SIP

This is a good library to start with. The project has a lot of modules, but the SIP and RTP implementations are simple and pure java (including g729 codec !!!)
http://sourceforge.net/projects/javaforce/

though java is not very much used here, i hope it's helpful, this is google talk approach