I have a Java application that runs great :) While uploading files, it uses the standard output to show progress : "System.out.println(...);".
When I run it in Eclipse, well it works perfectly, but when I run the JAR file, I don't see any console/terminal showing up and printing what I print through "System.out.println(...),".
How can I open a new terminal when my application is launched (it is a Swing application)?
Basically I want to be able to run the Swing application and show information on the side in a terminal / console. Why? Don't worry about why I want to do this ;)
Thanks a lot!
Regards.
Open terminal and run application as java -cp yourjar.jar YouMain or java -jar yourjar.jar if you jar is runnable.
I believe that you do not see output because you are running your application using javaw - the special windows-only variation of JVM that does not have STDOUT at all. If you want to click your application and see output map *.jar file to be opened using java instead of javaw. Alternatively write bat file that runs your application. In this case you will see console.
Use java instead of javaw to launch your application. Double-clicking on a jar executes it with javaw. Instead, open a command line window and type
java -jar thePathOfTheJarFile.jar
If you want to have something double-clickable, then write a shell script containing this command, and double-click the shell script instead of the jar.
Related
I would like to see some of the System.out and accept some inputs from it for testing my application on other computers which do not have Eclipse on them.
Normally, if you run the jar by double-clicking then the console output won't be shown.
However, you can launch the command line application (Terminal/CMD depending on your OS) then use the cd command to navigate to the directory of the jar file. Then type:
java -jar [app_name.jar]
This will run the application and show output within the console.
We have a Java application based on Eclipse (main class implements IApplication) that is started from the Windows command line. Its output on System.out is not visible/printed into the command window from which it is started. Nevertheless, when piping the output to more, the output is fine. How come?
For example, consider helloworld.exe. When running C:\>helloworld.exe in a command window, the application simply returns. But when running C:\>helloworld.exe | more, the screen shows
C:>helloworld.exe | more
hello world
C:>
On linux, the output is fine. How to see the output on Windows, too?
Some reqested information:
The application is quite large. And I probably cannot cut it down. The output are simple calls to System.out.prinln("xxx");
Java version 1.8.0_60, Eclipse 3.6.2
Using >std.txt 2>err.txt shows that output is indeed on stdout.
Line endings are CR/LF
the .ini file is as follows
--launcher.suppressErrors
-vmargs
-Xms256m
-Xmx4096m
-Djava.naming.factory.initial=com.sun.jndi.fscontext.RefFSContextFactory
-Djava.library.path=plugins
Maybe this issue is related?
If your application is somehow started via eclipse.exe (has no console attached to it) change the call to use the eclipsec.exe (has a console attached to it, note the c in the application name).
You can launch Eclipse RCP based applications using equinox launcher as shown below:
java -jar plugins/org.eclipse.equinox.launcher_1.1.1.R36x_v20101122_1400.jar
Of course you have to find the correct version of equinox launcher you are using in your RCP Application.
This way you would see the console logs.
You can read more about it here: http://wiki.eclipse.org/index.php/Starting_Eclipse_Commandline_With_Equinox_Launcher
EDIT: The reason you don't get console logs when eclipse.exe based launcher is used is because eclipse.exe on Windows spawns a separate process which brings up another command prompt window.
You'd better use a framework to handle your logs like logback
This is much more portable and maintainable.
In your example it seems that you have created an exe from your java code. My guess is that the packager you used to create the exe made some changes to the output target because it is a wrapper for your java program.
Try creating a jar instead and try executing it by java -jar helloworld.jar.
Is the string going to stderr in place of stdout? (or the other way around depending on your expected behaviour).
https://support.microsoft.com/en-us/kb/110930
I want to execute java application without displaying popup console. It because in 64bit applicaton, the GUI (console) will created in different session ID. I even use Java Service Wrapper, but the batch file still showing an popup console. So, how can I execute java application without displaying popup console? Or there any alternative way?
Running following command in command prompt, or through a batch file should help you:
start javaw -jar -Xms1024m -Xmx1024m <Your Jar File>
Refer to this thread for more.
In an application I am writing, I am launching another application (a runnable JAR) using Runtime.exec(...). Everything launches successfully in Windows, but Linux (specifically certain installations of CentOS - works in Ubuntu) has been giving me some problems. For some reason, the only way the secondary application will successfully launch is if I execute the first through a terminal. All behavior works as expected. However, if I launch the first application by double-clicking its icon (without a terminal open), the button to launch the second application seems to do nothing. I get no exceptions or error output - just a flash of my progress bar saying that it is launching, and then nothing. I can confirm through jconsole that the second application's process is never launched.
I have seen the commonly linked article on the pitfalls of the exec method ( http://www.javaworld.com/javaworld/jw-12-2000/jw-1229-traps.html ), but have not been able to solve this problem with anything I have found there. I am in fact reading the output and error streams of the second process, as I see all output when it successfully runs (after launching the first application through a terminal command). Not knowing a lot about deeper workings of Linux, I think this sounds like it may be a permissions issue with the output stream or something, but I am not sure.
In case it helps to diagnose the problem, I am using the command:
rt.exec(new String[]{"\bin\bash", "-c", "java -jar myjarfile.jar myArg1 myArg2 ..."}); Since this works (depending on how the application is launched), I'm not too concerned that anything is wrong with this piece of code...
Anyone have any suggestions? Thanks in advance!
EDIT: The solution was to fix the directory to the JAR I was attempting to run. When launched via the GUI, user.dir was pointing to the parent directory of the folder containing my application. Since I'm using Eclipse RCP, my solution was to use
String currDirPath = Platform.getInstallLocation().getURL().toString(); instead. Thanks for the help everyone!
Since you're just using the jar file name - myjarfile.jar - and not the full path to it, depending on the current working directory, the jar may or may not be found. Try changing your exec command to use the full path to the jar instead. You can debug this by using rt.exec() to write the output of 'pwd' to a text file.
instead of
rt.exec(new String[]{"\bin\bash", "-c", "java -jar myjarfile.jar myArg1 myArg2 ..."});
use
rt.exec(new String[]{"\bin\bash", "-c", "/***path to java***/java -jar myjarfile.jar myArg1 myArg2 ..."});
So far i've created a service using automator to compile a Java file. This means that i can compile a java file through its contextual menu.
Unfortunately I cannot do the same with running the Java file. Through automator I can get it to run the java file perfectly, showing the results in the automator window, however it will not open the Terminal window to view the java file. I did this using this code:
java -classpath `dirname "$1"` `basename "$1" | sed "s/.class//g"`
Applescript on the other hand can run Terminal commands into a Terminal window for all to see using code such as:
on run {input, parameters}
tell application "Terminal"
activate
do script with command "java -classpath" & input & input
end tell
end run
The correct way to run a java file is:
java -classpath /path/to/ file
Can anybody please help?
Thanks in advance.
Utilities > Run Shell Script with Passing input: as arguments seems to work in this context.
Addendum: If you want to open Terminal, something like this may work.
open -a Terminal ~/your/script.sh