Log a warning if Webapps or REST are enabled but not supported on the…

… current server runtime.

micronaut-camunda-bpm-feature/src/main/java/info/novatec/micronaut/camunda/bpm/feature/webapp/JettyRuntimeMissing.java

@@ -0,0 +1,56 @@
+/*
+ * Copyright 2020-2021 original authors
+ *
+ * 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
+ *
+ * https://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 info.novatec.micronaut.camunda.bpm.feature.webapp;
+
+import info.novatec.micronaut.camunda.bpm.feature.Configuration;
+import io.micronaut.context.annotation.Requires;
+import io.micronaut.context.event.ApplicationEventListener;
+import io.micronaut.runtime.server.event.ServerStartupEvent;
+import io.micronaut.servlet.jetty.JettyServer;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+import javax.inject.Singleton;
+
+/**
+ * Log a warning if Webapps or REST are enabled but not supported on the current server runtime.
+ *
+ * Currently, the Webapps and REST are only supported on Jetty.
+ *
+ * @author Tobias Schäfer
+ */
+@Singleton
+@Requires(missing = JettyServer.class)
+public class JettyRuntimeMissing implements ApplicationEventListener<ServerStartupEvent> {
+
+    private static final Logger log = LoggerFactory.getLogger(JettyRuntimeMissing.class);
+
+    protected final Configuration configuration;
+
+    public JettyRuntimeMissing(Configuration configuration) {
+        this.configuration = configuration;
+    }
+
+    @Override
+    public void onApplicationEvent(ServerStartupEvent event) {
+        if (configuration.getWebapps().isEnabled()) {
+            log.warn("Webapps are enabled via 'camunda.webapps.enabled' but they are not supported on the current server runtime. Please switch to Jetty, see https://github.com/NovatecConsulting/micronaut-camunda-bpm#camunda-rest-api-and-webapps");
+        }
+        if (configuration.getRest().isEnabled()) {
+            log.warn("REST are enabled via 'camunda.rest.enabled' but it is not supported on the current server runtime. Please switch to Jetty, see https://github.com/NovatecConsulting/micronaut-camunda-bpm#camunda-rest-api-and-webapps");
+        }
+    }
+}