Posted by Avi Kalcheim on Aug 17, 2017; 12:30pm
URL: https://forum.jogamp.org/Java-3D-in-headless-mode-tp4038145.html

I have a java3D application I am trying to execute in "batch" mode on a Linux machine without graphical environment.
It reads a macro file, do some work, then save graphics objects created with java3D.
I saw on gitHub you added recently a commit:
j3dcore: allow Java3D to operate in headless mode when using the noop… …
hharrison committed on Oct 29, 2016

// Java 3D cannot run in headless mode unless using the noop renderer
                        + if (java.awt.GraphicsEnvironment.isHeadless() && pipelineType != Pipeline.Type.NOOP) {
                        + throw new java.awt.HeadlessException();
                        + }
                        +


So, on the java line I wrote:
java  -Dj3d.rend=noop  -Djava.awt.headless=true ….


Then, in the program if wrote:

GraphicsConfiguration preferredConfiguration;
boolean   offScreenFlag;
Canvas3D canvas;


            String headless = System.getProperty("java.awt.headless");
            if (headless.equals("true"))
            {
                offScreenFlag = true;
                preferredConfiguration = null; /// This is obviously wrong…
             }
            else
            {            
// Retrieve preferred graphics configuration.

                preferredConfiguration = SimpleUniverse.getPreferredConfiguration();
                if (preferredConfiguration == null)
                {
                    // Write an error message to the logger and exit
                                ….
                }
                offScreenFlag = false;
            }
           
            // Create canvas.
            canvas = new Canvas3D(preferredConfiguration, offScreenFlag);
        }

I am getting
Exception in thread "main" java.lang.NullPointerException: Canvas3D: null GraphicsConfiguration
                at javax.media.j3d.Canvas3D.checkForValidGraphicsConfig(Canvas3D.java:943)

I presume I must supply a valid preferredConfiguration for the headless mode in some way, but I don’t know how.

Can you please help me ?