[client] fix NPE on missing L&F config

1 files changed, 14 insertions, 3 deletions

diff --git a/dozentenmodul/src/main/java/org/openslx/dozmod/gui/window/ConfigWindow.java b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/window/ConfigWindow.java
index 4637b839..c8c0d9d0 100755
--- a/dozentenmodul/src/main/java/org/openslx/dozmod/gui/window/ConfigWindow.java
+++ b/dozentenmodul/src/main/java/org/openslx/dozmod/gui/window/ConfigWindow.java
@@ -7,6 +7,7 @@ import java.util.Enumeration;
 
 import javax.swing.AbstractButton;
 import javax.swing.JRadioButton;
+import javax.swing.UIManager;
 import javax.swing.event.ChangeEvent;
 import javax.swing.event.ChangeListener;
 
@@ -29,7 +30,7 @@ public class ConfigWindow extends ConfigWindowLayout implements UiFeedback, Acti
 
 	private final static Logger LOGGER = Logger.getLogger(ConfigWindow.class);
 	private SatelliteUserConfig userConfig = null;
-	private JRadioButton selectedLookAndFeel;
+	private JRadioButton selectedLookAndFeel = null;
 
 	public ConfigWindow(Window modalParent) {
 		super(modalParent);
@@ -80,11 +81,17 @@ public class ConfigWindow extends ConfigWindowLayout implements UiFeedback, Acti
 		// set font scaling as saved in config
 		sldFontSize.setValue(Config.getFontScaling());
 		sldFontSize.addChangeListener(changeListener);
-
 		// -- Look And Feel --
 		for (Enumeration<AbstractButton> btn = btnGroupLookAndFeel.getElements(); btn.hasMoreElements();) {
 			final JRadioButton b = (JRadioButton) btn.nextElement();
-			if (b.getToolTipText().equals(Config.getLookAndFeel())) {
+			if (Config.getLookAndFeel() != null && !Config.getLookAndFeel().isEmpty()) {
+				if (b.getToolTipText().equals(Config.getLookAndFeel())) {
+					selectedLookAndFeel = b;
+					b.setSelected(true);
+				}
+			}
+			// check if we set from the config, if not fall back to system look and feel
+			if (selectedLookAndFeel == null && b.getToolTipText().equals(UIManager.getSystemLookAndFeelClassName())) {
 				selectedLookAndFeel = b;
 				b.setSelected(true);
 			}
@@ -96,6 +103,10 @@ public class ConfigWindow extends ConfigWindowLayout implements UiFeedback, Acti
 				}
 			});
 		}
+		if (selectedLookAndFeel == null) {
+			// non-critical but log it anyways
+			LOGGER.error("Failed to detect the current look & feel theme.");
+		}
 
 		// Transfer connection count
 		sldConnections.setValue(Config.getTransferConnectionCount());