Improve error reporting.

org.jdrupes.vmoperator.manager/src/org/jdrupes/vmoperator/manager/Controller.java

@@ -21,9 +21,11 @@ package org.jdrupes.vmoperator.manager;
 import io.kubernetes.client.openapi.ApiException;
 import io.kubernetes.client.openapi.Configuration;
 import java.io.IOException;
+import java.util.logging.Level;
 import org.jgrapes.core.Channel;
 import org.jgrapes.core.Component;
 import org.jgrapes.core.annotation.Handler;
+import org.jgrapes.core.events.HandlingError;
 import org.jgrapes.core.events.Start;
 
 /**
@@ -74,6 +76,20 @@ public class Controller extends Component {
         attach(new Reconciler(channel()));
     }
 
+    /**
+     * Special handling of {@link ApiException} thrown by handlers.
+     *
+     * @param event the event
+     */
+    @Handler(channels = Channel.class)
+    public void onHandlingError(HandlingError event) {
+        if (event.throwable() instanceof ApiException exc) {
+            logger.log(Level.WARNING, exc,
+                () -> "Problem accessing kubernetes: " + exc.getResponseBody());
+            event.stop();
+        }
+    }
+
     /**
      * Handle the start event. Has higher priority because it configures
      * the default Kubernetes client.

org.jdrupes.vmoperator.manager/src/org/jdrupes/vmoperator/manager/Manager.java

@@ -32,9 +32,11 @@ import org.apache.commons.cli.Option;
 import org.apache.commons.cli.Options;
 import static org.jdrupes.vmoperator.manager.Constants.VM_OP_NAME;
 import org.jdrupes.vmoperator.util.FsdUtils;
+import org.jgrapes.core.Channel;
 import org.jgrapes.core.Component;
 import org.jgrapes.core.Components;
 import org.jgrapes.core.annotation.Handler;
+import org.jgrapes.core.events.HandlingError;
 import org.jgrapes.core.events.Stop;
 import org.jgrapes.io.NioDispatcher;
 import org.jgrapes.util.FileSystemWatcher;
@@ -95,6 +97,20 @@ public class Manager extends Component {
         fire(new WatchFile(config.toPath()));
     }
 
+    /**
+     * Log the exception when a handling error is reported.
+     *
+     * @param event the event
+     */
+    @Handler(channels = Channel.class, priority = -10_000)
+    @SuppressWarnings("PMD.GuardLogStatement")
+    public void onHandlingError(HandlingError event) {
+        logger.log(Level.WARNING, event.throwable(),
+            () -> "Problem invoking handler with " + event.event() + ": "
+                + event.message());
+        event.stop();
+    }
+
     /**
      * On stop.
      *