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Simply put, how would you design an application that supports straightforward and reliable auto-updating?
I'm interested in how it could be cut up and the various operations involved.
Edit: This is linked to this question: Self-destructing application
Concerns that need to be dealt with:
If the app that does the updating is itself being updated, a restart is going to need to occur, or a stub would need to be executed to move the file into place (to avoid a file-in-use error.)
Whatever service you're communicating with to retrieve files via a web request would need to know what current version of installed package you're running. It would dynamically build the file URL list and maybe even zip up a file and put it out at a single URL for the client. Otherwise, have the client walk through the URL list, pulling each file. Each URL would be associated with an operation, such as 'copy' or 'execute'.
Process each retrieved file and install it to the client.
Update needs to be atomic (ability to rollback if any part of the operation fails.) You don't want to be left in a partial state.
Java Network Launch Protocol does a great job of making it easy to deploy auto-updating software. Some people on this site have reported issues with it, but that may be due to using older versions of Java or not correctly setting up the JNLP file. I have found that it works great on Mac and Windows and on a PC at work without logging in as an administrator, I was able to effectively "install" my software. From the user's persepctive, it is just like I gave her a new desktop app. There is a program icon on the desktop and files saved by my program are associated with it - windows gives them the right icon and when you double-click them they open. But every time she runs the program, JNLP first checks her locally stored JAR files against what is on my server and if her files are older than the ones on my server, the software gets updated. The programs still launches as fast as a native windows app, except for the first time when it has to download everything.
Now to make the program self-destruct, here are two options:
Change you jar files on the server to be short and useless. The user launches the program, it updates, and then they see a dialog box telling them that the program is no longer available. You can also disable features this way. But this will affect ALL the users at once. You could create several different JNLP files, each for a different class of users with the same time line for your app to live, you could even have a service generate the JNLP file. But the control to disable it will still come from you changing the jars on your server.
When the program starts it first contacts a web service to verify that the program should still be running. You can create a database table associating your users with which features they can use now. If your users do not register, you would need to somehow create an id for them when they first run the program, place it on the db table and store it on the client's computer using the preferences api.
If you are unfamiliar with using JNLP to autonate updates, here is some background to help you get started:
A JNLP file is an XML file that describes where your application is stored on-line and which JAR files it needs to run. Various properties of the app are also specified, like a splash screen, desktop icon, the updating style (always ask, just upate without prompting, update in the background) and which files to associate with the program.
Read the JNLP developer guide for detailed insturctions on how to get it working.
You can also see numerous examples on-line. In Chrome the default behavior of a JNLP file is to just save it, in other browsers you may need to right-click and save as, but that only works if there is a direct link to the file and not a fancy javascript button. You can then open the JNLP file in your favorite text editor as an exmaple.
The swing tutorials use JNLP files to demonstrate the code.
Related
I'm trying to build a report-building tool (which has a UI written in JavaFX) that has the following features:
When the system (re-)boots, it should auto-start in the background (without showing the UI)
It should have an icon in the system tray
The UI should only show when the user clicks on the system tray icon
A report should be generated either once a day/week/month, at a specific time, automatically
It should "snooze/sleep" in the interim period and use minimal resources while it awaits the next trigger time
It should show a toast pop-up / Windows notification / whatever when a new report has been generated
(The bold ones are the real problems, the italics are maybe solvable--given some resources I found--and the un-formatted one I have a work-around for, namely to place it on in the Startup folder in the AppData folder of the users' machine.)
But the clincher is the following: due to my company's policies, I'm NOT allowed to build register it as a Windows service. Also, converting it into a web service, placing it on a server, and using Control-M (or a cron expression) are also off the table. (That's a long story for another day.) I'm not sure how to implement it and I've been stuck on this for a bit.
I've taken a look at Quartz, this other StackOverflow question, and some other resources on how to run the Java app in the background, but most resources tell me to add it as a Windows service and I keep hitting a brick wall. Also, I don't know how much of an effect the application would have on the users' machines if I ran the application in the background with the solutions mentioned in the other StackOverflow answer. I need to have a minimal processing footprint in the interim period.
I'm also unsure of how to package the application as an EXE. For now, I'm going to turn it into an executable JAR. (Any help on this would also be welcome.)
I'm open to any suggestions and ideas and even other resources to look at for further reading. Anything to help me out here is welcome.
I have a jar file and I wanted to run this file as a service. When this .jar executes, it opens another program that I want to be able to see it GUI. But note: only the second program needs a GUI (the .jar not). I open this second program using the following:
ProcessBuilder processBuilder = new ProcessBuilder(cmdCommand);
processBuilder.redirectErrorStream(true);
Process process = processBuilder.start();
Searching about this issue I saw that if I performed my .jar file as a service, I could not see the process started GUI because services executing in another desktop since Windows Vista. To create a service, I used Java Service Wrapper. On this tutorial, they teach how to use the wrapper.ntservice.interactive configuration to make for the service to display a GUI. They alert too:
"Starting with Windows Vista and Server 2008, Microsoft changed the way services are allowed to interact with the desktop. They decided that for security reasons, services are now only allowed to show their GUI on a special desktop that only the service can interact with. Unfortunately, this makes interactive features pretty much useless. We are looking into ways to display a GUI in a different way. Stay tuned.
If you do a search on the Internet with keywords of "Interactive services dialog Vista", you will find a number of references to the way Windows will display a dialog on the user desktop whenever a service has updated into GUI on the services desktop.
There are some important security reasons why this was disabled in Windows. But if you really need to reenable this functionality, it is possible to do so by editing the Windows Registry and setting HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Windows\NoInteractiveServices to 0. Always be very careful editing the registry as you can easily mess up your system by changing the wrong values."
I've been tried to configuration the NoInteractiveServices to 0, but yet do not work.
So, how can I execute a .jar program when windows initialize and the user do the login, and still be able to see the GUI of my opened process?
I have already asked this and was heavily downvoted. Unfortunately, I still can't solve it. I don't know what I do, but sooner or later I loose an ability to run java applets and java web start applications in all browsers.
Here is an example what is happening.
I am opening page with applets http://csis.pace.edu/~bergin/Java/applets.htm and getting the following picture:
with signs plugins were blocked. I am trying to unblock
which causes another dialog
after OK I have another
next
if clicked
And so on.
Applet doesn't run.
After dancing with PATHes, Java updates and so one, once I can have applet run. But sooner or later I will stuck in this position again.
I would like to know, is it possible to exclude this situation in principle?
I mean I don't want to disable security at all, but I mean that in case my explicit permission everything should run. Is it possible to do that?
UPDATE
First of all, I don't understand, why can't I run applet on outdated java if I want?
I am a human and robots should obey me! :)
Suppose I wish to debug my applet on old version of java, why not?
Second, there is no information about what version it thinks I have and what version it wants?
Without this information it is possible that there is just a bug in version detection mechanism.
I have multiple versions of Java in Program Files since I am a Java developer. Then how can I know which one it uses?
UPDATE 2
I have updated my Java from 1.8.0_20 to 1.8.0_25 and now situation have changed, but applets are sill impossible to run.
The proof I have "latest" java:
The proof I have added the site above to exclusions list:
The effect of applet run:
(applet not runs)
Clicking details result:
(no any details in fact)
So, what to do?
UPDATE 3
This site is not working: http://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2012VP113;orb=1;cov=0;log=0;cad=0#orb
(show orbit diagram)
Reloading/restarting browser does not help.
I looked at your html source and realized you're using the .class file directly instead of wrapping it in a jar file. This is what you have:
<applet code="GSort.class" width=700 height=400>
I think applets no longer work when using .class files directly due to new security requirements. They have to be wrapped in jar files because you need to add some security settings to the meta-inf folder of the jar file. Here is how oracle recommends deploying an applet:
https://docs.oracle.com/javase/tutorial/deployment/applet/deployingApplet.html
Edit:
I tried again with adding the site url to the Java security exception list and this time I got it to work! It looks like chrome stays in memory after exiting so changing Java security doesn't affect it unless you shut down chrome completely and restart it. Easiest way is to use Internet Explorer. Try it with Internet Explorer and it should work (assuming that you still have the site added under java security exception list).
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I have created a game called "WordHunt" and I want to burn it to a cd/dvd..
Is there a proper way to burn java files especially GUI into the cd/dvd?? Is there a tutorial about it? can u please show it to me. I really want to learn it badly.
I'm assuming you have a game that you'd like to install a game you've written in Java from a CD/DVD. For that, you might want to use one of a series of freely available installer generators (found here).
If in fact you are simply trying to create a CD/DVD which autostarts a Java game, this explanation of Windows autostart procedures might help you:
[...]
If Windows finds a (plain text) file called AUTORUN.INF in the root directory of a CD then it follows the instructions in this file to run a program, as per the above descriptions. This example AUTORUN.INF file tells Windows to run program shellrun.exe (from the root directory of the CD) which in turn will show web page default.htm in the user's default browser. The other options are described below.
[autorun]
open=shellrun.exe default.htm
icon=shellrun.exe
action=Start ShellRun-CD
label=ShellRun-powered CD
Use the Windows Notepad application to edit plain text files (it is in the Start+All Programs+Accessories menu).
Your CD users may have switched off AutoRun. This might be because they are concerned about viruses. Also, if they press the Shift key down while inserting the CD, AutoRun is disabled.
There is no way to force your users to use AutoRun. It is therefore good practice to provide instructions so that users know how to start your CD, eg tell them to open file default.htm in their browser. These instructions are also required if your CD might be viewed by non-Windows users.
[...]
Having said that, the more "Java-like" solution to this problem would probably be something like a Java Web Start application. You might want to look into that technology before you go with physical distribution :)
Is there a proper way to burn java files especially GUI into the cd/dvd?
Don't do it!
The best way to distribute software to users these days is over the net. For deploying Java based desktop clients from a link, look to Java Web Start.
Java Web Start (JWS) is the Oracle Corporation technology used to launch rich client (Swing, AWT, SWT) desktop applications directly from a network or internet link. It offers 'one click' installation for platforms that support Java.
JWS provides many appealing features including, but not limited to, splash screens, desktop integration, file associations, automatic update (including lazy downloads and programmatic control of updates), partitioning of natives & other resource downloads by platform, architecture or Java version, configuration of run-time environment (minimum J2SE version, run-time options, RAM etc.), easy management of common resources using extensions..
I have installed SIPDROID. I made three account at sip2sip.
After that I have configured application using one of that account. Application works fine.
Question is: If I make multiple call to the same phone using SIP is there anyway to handle all calls at a same time?
Another incoming call is not displaying on mobile screen while first call is continue.
The first call getting picked up but what about the second call which is coming during first call.
Even second call is not displaying on the screen. Confused !!
Sipdroid that I what started with but after researching on it and from developers reviews I found that application has some missing functionality like multiple call and transferring calls etc...
I don't know but may who is expert in sip stack or have time to do can implement missing functionality but I am neither one of them so my desire to get an application that have all this functionality and by modifying it I can integrate into my application and csipsimple is the answer.
However its not easy job to build csipsimple into windows environment but there is hack how to do it. so carefully read its wiki about building project into window environment.
According to wiki you can build native library or you can go ahead without building the native library. I suggest for windows user to go with without building the native library.
If you have read wiki then in "without building the native library" section last line is like
"To get the .so files, download latest nightly build from nightly
build website and unpack the apk file (apk files are just zip files).
Then get lib/ARCH/.so files and copy it into CSipSimple
libs/ARCH/.so"
I have to clarify one important thing about that:
First get .apk file of csipsimple. The version of .apk file must same to download version of your csipsimple source code..
Here, you can see the source code version. Download the same version .apk and do further as described in wiki.
SipDroid supports only one line at all times. This means you cannot have conference calls. So to the question:
If I make multiple call to the same phone using SIP is there anyway to
handle all calls at a same time?
Nope, you cannot handle simultaneous calls at the same time. Fortunately there's another open source SIP Client that supports multiple lines - IMSDroid.
Though you can extend SipDroid to support multiple lines, that's a lot of effort. The main objects you have to pay attention to in order to support multiple lines are:
UserAgent, SipProvider (note that it's designed to support multiplexing/demultiplexing of SIP messages), JAudioLauncher and the Call object.
The bug you're describing with the second call not showing is not something I have witnessed. This could be due to your device setup, or due to customizations performed on the original code...
you can build the csipsimple easily in linux OS... All you have to do is just paste the download source link in linux commanpropmt and for windows you must have latest cygwin software to download or to build native library... Better option is to go for linux OS only...