Handle fatal error

teku/src/main/java/tech/pegasys/teku/cli/BeaconNodeCommand.java

@@ -74,6 +74,7 @@
 import tech.pegasys.teku.infrastructure.metrics.TekuMetricCategory;
 import tech.pegasys.teku.infrastructure.unsigned.UInt64;
 import tech.pegasys.teku.storage.server.DatabaseStorageException;
+import tech.pegasys.teku.validator.client.NoValidatorKeysStateException;
 
 @SuppressWarnings("unused")
 @Command(
@@ -352,7 +353,17 @@ public Integer call() {
   }
 
   public void reportUnexpectedError(final Throwable t) {
-    getLogger().fatal("Teku failed to start", t);
+    if (t instanceof NoValidatorKeysStateException) {
+      getLogger().fatal("Teku failed to start: " + t.getMessage());
+    } else {
+      getLogger().fatal("Teku failed to start", t);
+    }
+    errorWriter.println("Teku failed to start: " + t.getMessage());
+    printUsage(errorWriter);
+  }
+
+  public void reportUnexpectedErrorNoStacktrace(final Throwable t) {
+    getLogger().fatal("Teku failed to start", t.getMessage());
     errorWriter.println("Teku failed to start: " + t.getMessage());
     printUsage(errorWriter);
   }

validator/client/src/main/java/tech/pegasys/teku/validator/client/NoValidatorKeysStateException.java

@@ -0,0 +1,24 @@
+/*
+ * Copyright Consensys Software Inc., 2023
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on
+ * an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations under the License.
+ */
+
+package tech.pegasys.teku.validator.client;
+
+public class NoValidatorKeysStateException extends IllegalStateException {
+  public NoValidatorKeysStateException(String message, Throwable cause) {
+    super(message, cause);
+  }
+
+  public NoValidatorKeysStateException(String message) {
+    super(message);
+  }
+}

validator/client/src/main/java/tech/pegasys/teku/validator/client/ValidatorClientService.java

@@ -272,7 +272,7 @@ public static ValidatorClientService create(
 
     if (validatorConfig.isExitWhenNoValidatorKeysEnabled()
         && validatorLoader.getOwnedValidators().getActiveValidators().size() == 0) {
-      throw new IllegalStateException(
+      throw new NoValidatorKeysStateException(
           "No loaded validators when --exit-when-no-validator-keys-enabled option is false");
     }