java.awt.HeadlessException

Question

JFileChooser chooser = new JFileChooser();
JDialog dialog=new JDialog();
dialog.setAlwaysOnTop(true);
/*System.out.println("is always on top?"+dialog.isAlwaysOnTop());*/
chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
int returnVal = chooser.showOpenDialog(dialog);

String path = null;

if(returnVal == JFileChooser.APPROVE_OPTION) {

    path=chooser.getSelectedFile().getAbsolutePath();

}

I have written this code in Servlet's doGet method.when i deployed in linux server getting following exception:

java.awt.HeadlessException
    at java.awt.GraphicsEnvironment.checkHeadless(GraphicsEnvironment.java:159)

Does anyone know how to over come this?

Answer 1

HeadlessException

Thrown when code that is dependent on a keyboard, display, or mouse is called in an environment that does not support a keyboard, display, or mouse.

Answer 2

Your HTML form should have something like this:

<form action="upload" method="post" enctype="multipart/form-data">
    <input type="file" name="file" />
    <input type="submit" />
</form>

Then, using Apache Commons FileUpload, you can process the uploaded file in your Servlet. See their User Guide and FAQ for more information.