fixing headless run

src/main/java/EyesisCorrectionParameters.java

@@ -573,7 +573,7 @@ public class EyesisCorrectionParameters {
 			String [] sensorFiles=null;
 // try reading all matching files
 			File dir= new File (this.sensorDirectory);
-//			if (debugLevel>1) System.out.println("selectSensorFiles, dir="+this.sensorDirectory);
+			if (debugLevel>1) System.out.println("selectSensorFiles, dir="+this.sensorDirectory);
 			File [] fileList=null;
 			if (dir.exists()) {
 				fileList=dir.listFiles(sensorFilter);

src/main/java/JP46_Reader_camera.java

@@ -30,6 +30,7 @@ import ij.process.*;
 import ij.gui.*;
 import ij.plugin.frame.*;
 import ij.text.*;
+import ij.plugin.PlugIn;
 
 import java.awt.*;
 import java.awt.event.*;
@@ -50,9 +51,8 @@ import org.xml.sax.InputSource;
 import org.xml.sax.SAXException;
 
 
-
 /* This plugin opens images in Elphel JP4/JP46 format (opens as JPEG, reads MakerNote and converts). */
-public class JP46_Reader_camera extends PlugInFrame implements ActionListener {
+public class JP46_Reader_camera implements PlugIn,ActionListener {
 
 	/**
 	 *
@@ -61,6 +61,7 @@ public class JP46_Reader_camera extends PlugInFrame implements ActionListener {
 	Panel panel1;
 	Panel confpanel;
 	Frame instance;
+	PlugInFrame plugInFrame;
 
 	String arg;
 
@@ -75,44 +76,33 @@ public class JP46_Reader_camera extends PlugInFrame implements ActionListener {
         public boolean demux=true;
 	public String imageTitle="cameraImage";
 	private int ExifOffset=0x0c;
+	private Boolean headless=GraphicsEnvironment.getLocalGraphicsEnvironment().isHeadlessInstance();
 
-	public JP46_Reader_camera() {
-		super("JP46 Reader Camera");
-		if (IJ.versionLessThan("1.39t")) return;
-		if (instance!=null) {
-			instance.toFront();
-			return;
+	public void run(String arg) {
 	}
-		instance = this;
-		addKeyListener(IJ.getInstance());
 
-		panel1 = new Panel();
-
-		panel1.setLayout(new GridLayout(6, 1, 50, 5));
-
-		addButton("Open JP4/JP46...",panel1);    
-		addButton("Open JP4/JP46 from camera",panel1);
-		addButton("Configure...",panel1);
-		addButton("Show image properties",panel1);
-		addButton("Decode image info to properties",panel1);
-		addButton("Split Bayer",panel1);
+	public JP46_Reader_camera(Boolean showGui) {
+		if (showGui) initGui();
+	}
 
+	public JP46_Reader_camera() {
+		initGui();
+	}
 
-		add(panel1);
+	public void initGui() {
+		//super("JP46 Reader Camera");
+		if (headless) return;
 
-		pack();
-		GUI.center(this);
-		setVisible(true);
-	}
-	public JP46_Reader_camera(boolean showGUI) {
-		super("JP46 Reader Camera");
 		if (IJ.versionLessThan("1.39t")) return;
 		if (instance!=null) {
 			instance.toFront();
 			return;
 		}
-		instance = this;
-		addKeyListener(IJ.getInstance());
+
+		plugInFrame=new PlugInFrame("JP46 Reader Camera");
+		instance = (Frame)plugInFrame;
+
+		plugInFrame.addKeyListener(IJ.getInstance());
 
 		panel1 = new Panel();
 
@@ -124,10 +114,10 @@ public class JP46_Reader_camera extends PlugInFrame implements ActionListener {
 		addButton("Show image properties",panel1);
 		addButton("Decode image info to properties",panel1);
 		addButton("Split Bayer",panel1);
-		add(panel1);
-		pack();
-		GUI.center(this);
-		setVisible(showGUI);
+		plugInFrame.add(panel1);
+		plugInFrame.pack();
+		GUI.center(plugInFrame);
+		plugInFrame.setVisible(true);
 	}
 
 	void addButton(String label, Panel panel) {