Swing JFrame not displayed

Question

I try to execute a java swing jar with a JFrame from a webapp like this :

Process p = Runtime.getRuntime().exec("java -jar my_swing_app.jar");

My app starts (logs are ok) but my jframe doesn't appear. When I run the swing app with powershell, there is no problem.

I try to execute this jar in a java web application that runs in Wildfly server.

Any idea ? Thx.

UPDATE

I tried with another command (without java swing app) :

Process p = Runtime.getRuntime().exec("cmd /c start C:\\test\\build.bat");

The result is the same. I can see the process on the windows process list (build.bat) but the command prompt doesn't appear.

Answer 1

The problem is the 'java -jar my_swing_app.jar' is getting interpreted as a single command. Instead try

            String[]cmd={nativeConverterCommand,tmpHtmlFilePath,tmpPDFFilePath};
        Process wkhtmltopdf=Runtime.getRuntime().exec(cmd);

Refer javadoc

The first string is the command, the 2nd and third arguments.