I have very strange problem- from one program I run another application- by Runtime.getRuntime().exec(). It's look like something like this:
Runtime.getRuntime().exec(java -jar Something.jar + "bla bla params");
And when I run this code from new project- everything is ok. But if I run this app from our system in company- the smaller application occasionally hangs.
And there is even better- if I close "parent" program, application "return to live"!
The app (which hangs) is small java swing application. The big application is java swing app too.
It uses the same db connection as application which run small app (Something.jar). Maybe that cause problem?
But for me it have no sense- if I run app by Runtime.getRuntime().exec- the running app is separate application container in separate JVM!
How test/debug that configuration?
Related
So, I have this client-server app which is written in 4th Dimension Language, that runs as a service so it restarts automatically if something happens to the server. This language has a built in function which allows you to run cmd commands and I have another java app in the same folder, that is in charge of sending emails, something my server side app cant handle. We use a command for running this jar from cmd and send the parameters from there, creating and xml for it to create an html from that and send it via email. The thing is when I run this command with the app running as a service, the command simply does not run, but, if I run the app normally, it works like charm, with no problems whatsoever.
At first I thought it could be the paths, so I got all the paths to be absolute, using the full route, yet it doesnt work still. Also I tried exporting the command as a bat and running it by hand, in the exact same path were the server is, and it works just fine. I thought that maybe the service needs some sort of admin privileges, so I started it as Admin from the service, but it changed nothing.
Is there any chance the service has some sort of limitation which doesnt allow the app to execute external commands? If so, is there anyway to bypass this limitation?
Well, I couldn't make it work when it was running by service, so I made a bat with the command the service uses and pasted it in the Windows Startup Folder, so it "opens manually" when windows starts. It's not the real answer, but is workaround for needing to use the service.
I have an application which starts second spring boot application (which contains some Swing GUI) from java code using following code
String cmd = "java -jar file.jar";
Process process = Runtime.getRuntime().exec(cmd);
but when program executes this command, I can see the application starts in the task manager and it's GUI is visible. The weird thing is when I close the second application(using JFrame Exit feature) it does not get closed and it hangs until the first application is running.
The main problem is my second application is bound to my first application and it hangs until I closed the first application.
does anyone know how do I resolve this issue ?
There are many Q & A on Runtime.exec, but still I found a strange behavior. I am running desktop application in which jobs (a kind of javax.resource.spi.work.Work) are submitted and executed in JBoss application server. Following is the code to run some script, which is blocking whenever it needs to launch any GUI. For example, if the script or command is
start notepad
The GUI is not launched, but i can see the notepad.exe in Task Manager. I dont know what is blocking to launch the notepad GUI. Following is the code:
String pathString= "D:\\folder\\abcd.bat";
pro = runtime.exec(new String[] {
pathString
});
Content of abcd.bat file is
start notepad
No error logs or exception found. The above code works very well in normal Java class.
EDIT: Issue found only with .exe files which launch GUI. Some .exe which does not require launching GUI but running some background task is executed very well with my code.
EDIT: Forgot to say that my application is running as service.
Starting from Windows vista, services not allowed interacting with desktop. More details here . It is windows security restriction to not allow services to interact with desktop. I have done changes in regedit and Log On properties of my service, it worked well.
I am currently developing a web server. I am at a stage where 99% of the work is building the business logic, data logic and running tests. In other words, I have no need for the project to run in tomcat.
Right now, I created a test class that runs a mixture of the current code I am working on and prints info to the console. I have to restart the web server each time I make a change, which wastes a few minutes each time. Then I have to GET the localhost:8080 and wait for the page to load before I can read the printed output to the console.
Is it possible to run a Main type function that simply prints to the console without having to run trough tomcat.
I have been working on a Web Application for Intranet use only. I work with Apache 7 and Windows Server 2003.
In one of my page, I need to open an external application that we can locate in C:/Program Files/etc... with some parameters already initialized. Of course, the user has to use the web application on the server to make it work (that will be the case).
To open the application, I use the ProcessBuilder object.
The problem:
When I work locally with Eclipse and run the server by hand, it works perfectly. Any application can open itself from a web page.
But when I use the tomcat windows service (and that's what we want to use on the server), it just never launches. Or to be more specific, it launches and stops the application directly. No java errors thrown and process.waitFor() with an exit value of 0. The fact is that we can run processes via the web application (I tried to run simple batch files), but when there is an UI involved, it will never appear.
Again, on the server this time, if I launch tomcat7.exe (that we can find in the %CATALINA_HOME%/bin directory) with a double click or cmd, the UI in the web application will appear. If I launch it with services.msc or tomcat7w.exe or tomcat7 start via cmd, it will not.
I thought of several things:
use another user to start the service
change the way the service is launched (StartMode: jvm, java. I did not succeed with exe)
I read Tomcat 7 Windows Service How-To many times but didn't find out anything to solve my issue.
Have you any idea of what is happening, and how to solve this issue ?
What is the big difference between running tomcat as a service and from the command line?
Option 1
If you open your service's properties window, go to the Log On tab then check the "Allow service to interact with desktop" check box you will get the behavior you want. Also depending on what app you what to run you may need to change the log on account.
see Launching GUI App from Windows Service - Window Does Not Appear
Option 2
Did you try start a cmd and there use
start /c "c:\path to\exe"
in cmd.exe type
help start
Option 3
You will need a daemon service that is not run as a service. windows puts certain restrictions on service apps.
This sleeping app can be started by tomcat or other your self. it can listen on a port or poll a folder for a new file, and when it gets a job to do it starts the app you want. Via port or text file you can send the parameters.