How can I warn users that a new version of my program is available?
I'm planning on releasing my desktop app as a .jar file through github, and I'd like to do a simple check each time a user starts the app to check if a new version is available.
How can I do this?
Sorry if this seems like a stupid question. I tried googling for it but I could only find results for mobile stuff. It's my first time release an actual app to the public ^^'
Alongside your executable/jar file, you can have a simple text file (e.g. version.txt) that you can download and read. Have your program start with a launcher that compares that version to the local version, if not the same? Download, then run.
Related
Two days ago I got close to finishing a java program that wrote, I wanted to let some friends play with it for a bit to find flaws etc. I created a runnable jar trough Eclipse and then I used Launch4j to transform the runnable jar into a .exe
It worked perfectly fine on my pc, but any other user couldn't open it. After a while I discovered that when people would install java JDK, it worked for about 40%, but this atleast pushed me in the direction of what the flaw is. Is there a way to (automaticly?) embed everything in the jar that my program is in need of? Or is there a way to determine what exactly it all is that people need for the .exe to run and what they are missing by running some pre-checks that can re-direct them to links where they can download this? I can't seem to find much on this subject, so I probably made a mis assumption somewhere, any help/clearance is appreciated!
There is a new tool called jpackage, which should do what you want.
Also see the User's Guide.
I have a few questions about uploading a app to the Windows 10 store. My question is, I code in Eclipse and I created a program in JAVA, can I still upload it???
Also, if the answer to that is Yes, when I went to https://msdn.microsoft.com/library/windows/apps/hh694062.aspx on one of the requirements, it said, Required (at least one package).
I might sound like a noob, but IDK what that means.
Also, heres my app that I want to add to the app store > http://www.mediafire.com/download/fm8nxv3wcmmclmo/Gadgets.jar
(this app still has bugs, I have a updated version but I have not added it to MediaFire yet).
Thanks guys!
You can't publish a Java app into windows 10 store, because .jar executables need Java so they are not compatible with the Windows store.
I am trying to understand what exactly is going on when you install an application (APK) on an Android device. I guess that files are are extracted from the package and copied somewhere on the device.
Are there other steps going on? For example, is the package name of the application written somewhere in the OS like in somekind of registry?
Is the application version number written as well somewhere or the OS reads the xml manifest of the application to know its installed version?
This is related to another question where I suspect that some data was not erased correctly during the uninstallation of a debug app and I am trying to find what that might be.
There will be files/dirs created in various locations, not necessary in all possible locations for every app though, it depends on how the app is configured.
This list is not necessarily complete.
Files/dirs:
/data/data
/data/app
/data/app-asec
/data/app-lib
/data/dalvik-cache
/data/local/tmp
/mnt/asec
/mnt/obb
/mnt/sdcard/Android/obb
/mnt/sdcard/Android/data
Your app will also get an entry in these files:
/data/system/packages.list
/data/system/packages.xml
/data/system/appops.xml
I'm trying to make a Java game updater launcher for my game. Similar to how minecraft works. However, minecraft has only a few .jar's to download wheras I would need to redownload all of my game assets. Is there any easy way for Java to check a file for which operations need to be taken? One idea I had was using .7z files since those can be compressed really small. That wouldn't work though because I can't seem to get Java to hook onto 7zip operations. Another idea I had was if it determined if an update was needed it would read a file with a set of commands like this:
remove assets/models/malecharacter.obj
add assets/models/alien.obj
...etc
But I'm not sure this is very efficient and I am also not able to find a lot of help with managing files. Any help and ideas would be appreciated.
I made a Game Launcher in Java recently, I still have a few problems to solve like how to update the launcher itself.
Anyhow, for the game updates/versions I just have a "versions" folder with a folder for each downloaded version, it might not be the prettiest of solutions but it works for multiple versions and it's easy to make.
My launcher checks a URL from my dedicated server which has all available versions, which I call it versionlist, then since the versions folder on the server obeys a path order I can call any versions which are in the versionlist. I download the selected version and extract it to a separate version folder on the user's pc.
I'm having a problem that, at this moment, I don't even know how to investigate properly. Any recommendations on how I can get more information are welcome and appreciated.
My company sells a product with a WinXP PC at its core. One of the product's tasks is being able to start a video player on demand -- VLC, in this case. (To be specific, VLC 0.8.6d; it's several years out of date, but upgrading is problematic for a few reasons.) The application responsible for starting the player and performing many, many other tasks is written in Java.
I have a test rig sitting next to my desk. It used to work just fine. But for some reason, it now gives a "Send Error Report" window when the Java app tries to start VLC: "VLC media player has encountered a problem and needs to close...." You know the one.
Clearly, I've done something that buggered things up. Problem is, I know neither what it could be nor how I would go about fixing it.
Stuff I know:
It's not a code bug. I run the same software on my development desktop machine, and it doesn't have this issue.
It's not the VLC install, nor is it a malformed video file. When I capture the command used to start it from Java and manually enter that command from a "cmd" window, it works fine.
It's not that sneaky bastich bug where Java punishes you if you don't manually drain STDERR and STDOUT when making a system call. I've got that covered.
I'm not getting any error messages or output when it fails; it just fails and gives me that pop-up window.
I'm stumped. Recommendations for either what it could be or how I can figure out what it is are very welcome.
Well, I’m not familiar with java and VLC, but I would do the following things:
Check that you have identical java virtual machines in both of your desktops. Just in case…
Check the process’s environment variables. They depend on parent process. Maybe VLC uses some of them.
Try to debug crashing with native debugger like WinDbg. Perhaps the call stack will give you more ideas.
Good luck!
My suggestions:
Create a simple java app that just launches VLC
Use your app to launch a simple command line windows program
Use your app to launch a complex program
Check to see if there is a memory constraint issue. Is VLC getting too little memory to run?
This really sounds like a memory/environment issue.
A number of things I would try
Make Sure both test and development machines are identical in every respect, the operating syste(if possible installed from same OS Disk), same JVM version, same memory allocation to JVM (you know those -X-ms stuffs). My fear is not with Java/JVM per se, it is with windows.
Make sure you can lunch for example Notepad from a Java app, and then something like Windows Media Player or MS Word.
Try and launch other versions of VLC to see if it is a VLC version problem.
Finally try and wipe the test box and re-install it(with Windows, you can never tell, a fresh installation might just do it!!)