Email-based sign-up in PlayJava - java

Now I am researching how to implement email-based sing-up in Play Java. However, I couldn't get any useful information, so can anyone tell me the information? In other words, can anyone show some links or the easy example of it?
This is the example written in Scala, but unfortunately I can't understand well, I am not familiar with Scala...
Any comment is welcome.
EDIT: Some people dislike this question. Maybe they think this is not a good question because I am supposed to reach some answers of this question.
However, in fact there seems to be no information that help me build email-based authentication when using Java. In Play Scala, you have many options. But I want to know how to realize it in Java, not Scala. So, this question is so meaning for some people who try to build a web app in Play Java.

You can do this using the Play Authenticate library: http://joscha.github.io/play-authenticate/

Related

How to read/send USB data in just plain Java?

Before answering, please read all of this so you don't miss any details.
I have been looking on the internet for days, and trying to look through the javadocs, but I cannot find the answer anywhere.
How can I get connected devices through USB by using the java API. I do not want to use any libraries as they aren't reliable enough for the purpose I am using it for.
How do USB java libraries do it, what Java API does it use to connect to USB devices?
I know it may be complicated to actually work with it, but it will still be very useful.
I did seen the use of File.getRoots(), but it just gives storage, like C:/, H:/, etc. I want to be able to communicate with any USB device, like mouses, keyboards, custom hardware, etc.
Also include examples of code as well. It helps a lot in understanding it better. Make sure to also get to the point, it helps by saving time.
Update: I still have no clue on how to start.
Update 2: I found something with javax.usb, is it part of the java api, when I do say java api, I mean stuff that is already with java and where you don't need to download anything but the JRE. I am not sure as if it was, I would think someone would of mentioned something about it here. Going to try to find more into it. I can't find anything on the official java-14 docs, so guessing not.
Update 3: Haven't found an answer yet. Everything is redirecting to usb4java, which has not been updated in a couple years, 3 years in fact. Which is actually one of the main reasons I don't want to use any external library as it might get abandoned and will cause some issues with my code in the future. Hopefully someone can help soon, I desperately need an answer and the internet is no help and everything seems to redirect to libraries, which again, I don't want.
Update 4: Still on the hunt for an answer, still haven't found anything useful.
Update 5: I am seeing that I have tons of uses to do this, but don't know how to do it from scratch.
Update 6: Still on the hunt for an answer. I have been looking hard but found nothing. Looking through the USB4JAVA library code has been proven to not help much. But, I am going to keep looking, hopefully I find something soon. Found something though, it's libusb, a C program that USB4JAVA uses. Even though I won't use Java libraries, I might just use C libraries for Java, if that makes sense.

How to use SQLite with libgdx

I was wondering if anyone knows a good tutorial that explains how to use SQLite with libgdx. All the ones I have found don't explain it well and I'm having trouble figuring out how to use it. So if you know of one that explains everything decently please give me the link to it. Thanks in advance.
Notice that the extensions available won't work for multi-platform, at max you'll be able to support Android and Desktop. My advise is for you to create your own classes for methods for accessing info stored as files on the device trough the LibGDX File API. You won't get to use SQL and it will certainly take longer but you'll get try multi-platform support (if that is what you're looking too of course).
https://code.google.com/p/libgdx-users/wiki/SQLite
Try this, although it is rather a suggestion of implementation rather than a full blown tutorial.
A Libgdx user proposed an SQLite extension several months ago. Its definitely a work-in-progress, but might be a good place to get some ideas or borrow some code from: https://github.com/libgdx/libgdx/pull/222

(android) : creating a application using json

I am trying the application program using json.what is the uses of json_decode in android.How can i use the json_decode in my application? is it possible means tell some idea.
I think you'd be best to ask on a forum like App Dev Forum or similar as this is not the sort of question we like to answer on StackOverflow. You really need to research these things yourself or give us a code snippet for us to check out. This is more of a strictly programming related community.
It would be MUCH easier if you used GSON. It automatically maps JSON to your classes.

Log into twitter?

Ok, basically what I am trying to do is get a boolean if I have logged in or not. I am using the Twitter4j library and they gave me the following three things to look at.
http://twitter4j.org/en/code-examples.html
https://github.com/yusuke/sign-in-with-twitter/blob/master/src/main/java/twitter4j/examples/signin/SigninServlet.java
https://github.com/yusuke/sign-in-with-twitter/blob/master/src/main/java/twitter4j/examples/signin/CallbackServlet.java
I have no idea how to log in and get if I logged in successfully.
Thanks, and I have no code btw... all I did was basically copy code and try different things.
PS. On a separate note how do I learn how to use someone elses library?
Twitter uses OAuth. There is no concept of having logged in from any external app. There is instead a concept of an app being authorized to communicate with your account on twitter. On how to learn to use somebody else's library... that's a really general question... reading the documentation is a good start, then the IRC channel for the relevant language (or library if it has its own IRC channel).
I've found people on IRC channels to be very helpful when you have a specific code problem you are trying to solve and the real time help often enables faster progress than waiting for answers to a question on a forum or SO.

Is alcheMo available?

Is it possible to develop iphone apps with java? I'd prefer to use alchemo over xmlvm because of the superior features that it offers. Can I do that? Is anyone else doing that? I've looked all over their site for the download link, but can't find it! Is it available? If so, where?
http://www.innaworks.com/alchemo-for-iphone-java-me-j2me-to-iphone-porting/
Is it possible to program with Java? Yes. There are also implementations of C# with Mono that work (kinda) with the iPhone.
Is it ideal? Probably not. Objective-C really is the first class citizen on the iPhone and the majority of information, resources and help will be centered here.
As for alchemo? This looks like one of those times you will actually have to contact New Zealand if you really want more info.
http://www.innaworks.com/Download

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