Index: trunk/src/org/openstreetmap/josm/plugins/PluginInformation.java
===================================================================
--- trunk/src/org/openstreetmap/josm/plugins/PluginInformation.java	(revision 15219)
+++ trunk/src/org/openstreetmap/josm/plugins/PluginInformation.java	(revision 15221)
@@ -23,4 +23,5 @@
 import java.util.jar.JarInputStream;
 import java.util.jar.Manifest;
+import java.util.logging.Level;
 
 import javax.swing.ImageIcon;
@@ -383,4 +384,6 @@
             return Class.forName(className, true, classLoader);
         } catch (NoClassDefFoundError | ClassNotFoundException | ClassCastException e) {
+            Logging.logWithStackTrace(Level.SEVERE, e,
+                    "Unable to load class {0} from plugin {1} using classloader {2}", className, name, classLoader);
             throw new PluginException(name, e);
         }