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Closed 6 years ago.
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What OS do they use for example and how to they boot up so quickly (compared to a raspberry pi)?
Currently, they are two option existing:
they are running a custom piece of software that support a jvm
they are running a minimum version of a linux , just what's enough to run the jvm, everything else is disabled / removed.
It's booting that fast because it has only the piece of code needed to run a minimal jvm, and everything else is disabled in opposition of the raspberry pi who has a complete kernel, with a lot of modules, a desktop environment, etc, ... to load.
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Closed 5 years ago.
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I want to develop an external PC application using Java and MsSQL/MySQL.
I want to share it with all people. But I have no idea about how to install MS SQL or MySQL automatically with my Application setup, without a normal manual database installation.
Or is there any other way to develop such an app using "Java + any database server"?
Or is there any best way to success this process with Java?
If you are programming in netbeans you need include the database within netbeans? Here is a guide on how to do this.
https://netbeans.org/kb/docs/ide/mysql.html
Also here is a second guide on Packaging and Distributing Java Desktop Applications
https://netbeans.org/kb/docs/java/javase-deploy.html
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Closed 8 years ago.
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How can I create JVM with fewer cpu and ram (resources) and give other access to it, while also ensuring that they cannot manipulate or view files or data of my system?
I want to create a web interface java compiler which everyone can use and would not like if other can manipulate my system.
If you use VirtualBox or another VM you can
choose the OS, it doesn't have to be the same.
choose all the files it can see
choose how much CPUs and memory it can use.
make it hard to break out of the virtual host and into the real host.
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Closed 8 years ago.
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I have 2 Jetty servers with the same problem,
The Jetty web app gets "freeze" every couple of hours.
(Freeze means that the console is not doing anything/unable to receive new requests)
During the "Freeze" I noticed that the JVM is using more swap than it usually does.
It seems like sort of a memory leak, even tough the system has enough memory.
I run the JVM with those run parameters:
-Xms8000m -Xmx280000m
Those are the RAM graphs (blank lines are what I called "freeze"):
See reference number 1 below
I also noticed the the garbage collector is not running very frequent.
Maybe it is related?
See reference number 2 below
I'd appreciate any input regarding a proper use of the garbage collector and any other ideas that would help resolve it
This is a spring/Hibernate based Application.
http://i.stack.imgur.com/VGOkM.jpg
http://i.stack.imgur.com/eI1mt.jpg
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Closed 9 years ago.
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I am using Ubuntu 12.04 and new for this environment. I have generated my project as war file and put under webapps folder of tomcat 7. But, How to run Apache Tomcat in-order to get result??
I think this is the solution. Under the tomcat/bin folder there will be one file named startup.sh. double click it, then it will ask for prompt, give run. for stop the server use shutdown.sh. I hope this will help you.
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Closed 2 years ago.
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I'm working on a OS for smart-phones and its built in Java and I know you can't (without alot of work) run a Java application without a kernel at the back-end, so would it be possible to run the GUI with a very small Linux kernel?
You can get Android source and install the JAVA emulator, then remove all the google/android/unwanted services and poof! Your GUI is on the Android Kernel/OS !
A linux kernel would be a good choice but you're going to need more than just that. You're going to need some sort of X server to display the gui (and drivers for the graphics device on the phone). You're essentially going to have to port the linux kernel and all of the drivers to support the phone hardware, X server / framebuffer, AND chose a Java VM implementation to run.
What you're described is what has taken Android and a team of talented people several YEARS to achieve. If you want to do some low-level device type hacking / Java development maybe you should consider getting in Android kernel/OS development. Get a phone, unlock the bootloader, get root, and start hacking