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EDIT: rewording my question to make it less vague: Would running a java app through a jar file on a node child process be slower than building the gui on Java? To clarify, I'm not asking if node is faster than Java, but if executing a jar through a child process is noticeably worse than running it natively in its own environment.
I have an app, kind of like a calculator that allows bit manipulation and persists data, and I would like to run it through node. The reason for this is because I want to release this as a desktop app and am familiar with React and Electron so I wanted to build the gui with those tools. What is the best way to do this? I have found many approaches but they all seem to be ideal for different situations. My app will not need to communicate to a server to run any code, all of the logic and data manipulation is on the java app, I just want to run it through node so I can create an interface. Here are some of the options I have found:
Create a .jar file and run it through a child process.
Use socket communication and talk on a Port (this looks like its used mostly for server communication but can be used on the same machine so i think it would still solve my problem)
I have also considered re writing the code in node (its not a lot of code so wouldn't take too much time) and also using JavaFx to create the gui, but I only want to resort to these options if they're significantly better that trying to run java code through a node app.
as per this answer:
Execute java code on a server
using a .jar is good and can be run through node directly.
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I have a C#(UWP) application which checks Toast Notifications in Windows. When it finds a notification, I want it to pass its Title(Application name which sent Notification) String to my Java application so I can run my java code with input being this string.
What I have tried is after notification is found in C# app, launch a JAR with my java app, but from my tests it takes up to 1500ms. I am looking for something under 10ms.
What would be the best, and fairly easy way to achieve so? I'm not so experienced in C#. I am only using C# because I don't think I can achieve getting Toast notification in Java.
You need to have the JVM running continuously to get low response times.
A good and well documented approach could be turning your java code in to a REST API and call that. Spring boot would be a good option for a stand alone service
The new graalvm compiler may create fast enough programs but I do not have personal experience with this usage.
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I have a Windows service written by another developer who no longer works with me. It was written in C# with .NET 4.5 requirements. Our solution is making the move to Linux and the daemon naturally needs to be converted.
My dilemma is what to rewrite it in? C++ or Java? The daemon is not complicated. It's simply a controller for our other applications to ensure if they crash or are killed they are restarted. Aside from that it performs health checks through a named pipe and is controlled via a password protected web socket via a separate management Tomcat web interface and writes all of it to logs.
Please put aside any suggestions of "write in what you're most comfortable with" I have a fair amount of experience and knowledge in both languages, and I'll learn whatever else I need to as I go. My concern is the feasibility and effort to accomplish everything I need. I don't have any particular time constraints, but if one language is a fraction of the time of the other then maybe that's a better solution.
Writing it in Java looks like the easiest solution currently, but writing it in C++ has the advantage of being native no-frills code. However, I haven't ever written any web interface or socket code in C++ before, so I do not know the effort involved with that.
To break down my requirements:
Linux
Web interface for control
Named pipe for communicating with client applications
Existing code needs to be heavily refactored
Is C++ or Java more appropriate?
Edit: added more info
Edit2: I guess I should have mentioned that the code needs to be heavily refactored anyways. It was originally written in such a way that renders it difficult to make changes and additions. So rewriting is a cleaner solution at this point. As I mentioned, it's not a large program. Just a controller service.
Porting the solution to .Net Core may the way to go. It will run on Linux (and Mac for all intents and purposes...) and most of your codebase may need minimal refactoring. The only concern is if .Net Core currently has the features you would need supported in the app. And, .Net Core is still in preview.
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I'm thinking about writing a desktop application that the GUI is made with either HTML or PHP, but the functions are run by a separate Java or python code, is there any heads up that I can look into?
There are a couple of possible options:
Run your backend code as an embedded HTTP-server (like Jetty* for Java or Tornado* for Python). If the user starts the application, the backend runs the server and automatically starts the web browser with the URL of your server. This, however, may cause problems with the operating system firewall (running a server on the local machine)
You could also have a look at CEF (chromium embedded framework). It is made for exactly this purpose (running an HTML-Application inside your code). It uses the same codebase as the chromium (and chrome) web browser. It was developed originally for C++, but there is also a Java binding: java-cef
Oh and by the way, PHP is a server-side language. I would not recommend to use it in your scenario (since your backend code is Python or Java).
*I have not enough reputation to add more than two links, so you'll have to google those ones yourself.
You could expose data from Java or Python as JSON via GET request and use PHP to access it. There are multiple libraries for each of these languages both for writing and reading JSON. GET request can take parameters if needed.
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I am building an application using java and oracle database. I want to confirm all the required software is installed and working properly on each time the user open the application and show the missing software/configuration error to the user and option to close the application.Is there any way.
You probably can't from a pure Java perspective, nor should you. That is really a job for your installation process. Every native platform you deploy to is going to have a different way of installing software and a different place to put it. If you really want to do this because you are doing your instillation with Java (and love writing more complicated code) you will need to leverage something like JNI or JNA to ask the underlying operating system what is installed. This is fairly simple on Windows and OS X, however, it's going to be next to impossible on most Linux's due to the differences in each package manager.
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I am beginning to write a basic "study-buddy" program as a side project. One important feature I want to implement is that the program can access the state of other programs running to prevent you from accessing them / yell at you. For instance, if you had Chrome open to Facebook, or if you launched a video game.
First off, is this even possible/reasonable to accomplish in Java? Second, specifically with Chrome, how can I access the programs state from another program that I am writing? More generally, how can I access ALL programs running on the computer and check to see whether anything violates "study-permissible" programs?
I would put this as a comment, but my reputation point is not enough.
One way is using the commands the operating system provides. You can run a command with
Runtime.getRuntime().exec("<command name>");
This will give you the related process and you can get the output of that process just as manually running the process. Then, you can utilize the output.
Basically if the OS provides you that information manually, you should be able to get the information within Java.