I have a java project built in eclipse in my Windows machine. Now i had to run it in Linux machine. I created a jar , and i am trying to run the jar.
The main class, takes a XML file as input. Previously on Windows, i had given path of the file in Windows. Now i kept the .xml file in the root location in Unix.
can i modify the code in Windows, to the root path of Linux machine and try to run the jar.
I did it like this ,
XYZ parsero = new XYZ("//root//workflow.xml");
Created the jar and tried to run in Unix.
I got the below exception.
java.net.UnknownHostException: root
How do i need to run this.
I got the solution. It should be XYZ parsero = new XYZ("/root/workflow.xml"); unlike in Windows
Related
Environment: Windows 11
Problem: cannot open .jar file(the MARS assembly language simulator)
Hello, I am currently trying to install the MARS assembly language simulator. It is a .jar file so I downloaded java to open it. However, I still can't open the file even with java downloaded.
I checked if java was installed using my cmd:
Command prompt showing java successfully installed
I tried double-clicking it did not work. So I right-clicked it to open with other apps. But I did not see java in the given options.
Cannot find the java option to open the file
Thank you so much for helping!
Use your prompt
CD into the directory with the jar
then execute
java -jar Mars.jar
...any more troubles , open file properties tab with right click on the jar and check permissions to execute the file.
Installing Java usually means installing a JVM, which is a Java Virtual Machine. You won't be able to launch files from a Windows context menu like this, because "Java" is not a program that opens files.
Instead you need to:
Either a terminal and call javaw.exe with the parameters -jar and your .jar-file. E.g.:
C:\your\java\binaries\javaw.exe -jar -SomeJarFile.jar
Or add the Java installation to your environment variables, then you can call javaw.exe without providing some specific path
I have created a java program (in Eclipse). I have successfully compiled it to a .jar file which I can run on windows without any problems. I want to give this program to a friend who has a MacOSX. So my aim is to:
Create a file which can be run on MacOSX
The twist is that I have to configure it on my Windows computer since I don't have access to a Mac. Any advice would be of great help!
I am not sure what you are referring as "create a file which can be run on macOSX"
If you want to run on any OS you just need a JRE on that particular system without it you cant run. It will provide a runtime environment to run a jar file. Then use below command to run the jar.
java -jar Myjar_file.jar
I'm getting an error when trying to compile a GWT application on an AWS EC2 Instance under AMI Linux.
I already installed Java and have it in directory /usr/lib/jvm/java-1.7.0-openjdk.x86_64.
I also set up the enviroment variables:
$JAVA_HOME = /usr/lib/jvm/java-1.7.0-openjdk.x86_64
$PATH = /sbin:/bin:/usr/sbin:/usr/bin:/opt/aws/bin;/usr/lib/jvm/java-1.7.0-openjdk.x86_64/bin
So, when I try to run the command:
java -cp
"/var/lib/gwt/gwt-2.6.1/gwt-dev.jar;/var/my-project-source-folder"
com.google.gwt.dev.Compiler com.mypackage.MyClass
I'm getting this error:
Error: Could not find or load main class com.google.gwt.dev.Compiler
I downloaded and unziped GWT 2.6.1 again but the files are fine. The same command is working perfectly in my Windows machine. Do you know what's happening?
Ok, this is embarrassing.
Here is the answer:
I was separating the paths with ; (Windows) instead of : (Linux). BTW, who would think in separate things with :, you Linux guys know how to make hard the easy...
We have a Java-JNI application that runs fine on Windows XP, and Windows 7.
When I try to run it on Windows 8 I basically get a cannot create file error.
If I point the file to be created in the Users/documents folder the application works.
If I point the file to be created in a C:\Tests folder or the Program Files (X86)/application folder it fails.
Similarly If I try to shell an application from the Program Files (X86)/application folder it fails.
It seems that using java on Windows 8 or Windows 8.1 has some file/folder creation restrictions.
Any suggestions. We do not want to migrate the entire application to a users folder at this time.
Thanks, Don
I have Java GUI application in Java SE version 7 which I run on Windows 7 64 bits. When I try to run it clicking on jar file the pop up Window is saying 'Cannot find the main class or load it:...'. When I run the same jar file via command line in this way: java -jar app.jar' it works fine. If you try to run it in this way: 'java app.jar' it throws the same error. On Eclipse IDE it works fine. The jar file has been created by the Eclipse IDE as Running jar file. I have created one more project with simple GUI. It has the same problems as above example. What might be the problem? My goal is to run the app once you click on the jar file.
Best regards
Sounds like on your system the .jar extension is registered to run with Java6 and your application needs Java7.
On the commandline type the following command to find out how the .jar extension is registered:
assoc .jar
It will show something like this:
.jar=jarfile
(Note: on your system it might be a different type name. Anything after the = is the typename that you need to use)
Now you need to find out which command is associated with the typename jarfile by using:
ftype jarfile
On my system it shows:
jarfile="C:\Programme\Java\jre7\bin\javaw.exe" -jar "%1" %*
If that is not pointing to a Java7 installation you need to change that e.g. through the ftype command or through the Control Panel.
You might also be able to switch the default Java VM by using the "Java" applet in the Control Panel.
You need to make a manifest file, under the Meta-INF folder. If there's already one there, add the line
main-class: [class name].class
And try that (not sure if there's supposed to be a space after the colon)