ConfigurationManagementGraph to throw Exception with custom ID setting

janusgraph-core/src/main/java/org/janusgraph/graphdb/management/ConfigurationManagementGraph.java

@@ -30,6 +30,7 @@
 import org.janusgraph.graphdb.database.management.ManagementSystem;
 import org.janusgraph.graphdb.management.utils.ConfigurationManagementGraphAlreadyInstantiatedException;
 import org.janusgraph.graphdb.management.utils.ConfigurationManagementGraphNotEnabledException;
+import org.janusgraph.graphdb.management.utils.ConfigurationManagementGraphSettingException;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 
@@ -77,6 +78,11 @@
     // but for now, leaving open for testing purposes
     public ConfigurationManagementGraph(StandardJanusGraph graph) {
         initialize();
+        if (graph.getConfiguration().allowVertexIdSetting()) {
+            final String errMsg = "ConfigurationManagementGraph prohibits usage of custom vertex ID config. " +
+                "Note: ConfigurationManagementGraph and actual graphs can have different configs.";
+            throw new ConfigurationManagementGraphSettingException(errMsg);
+        }
         this.graph = graph;
         createIndexIfDoesNotExist(GRAPH_NAME_INDEX, PROPERTY_GRAPH_NAME, String.class, true);
         createIndexIfDoesNotExist(TEMPLATE_INDEX, PROPERTY_TEMPLATE, Boolean.class, false);

janusgraph-core/src/main/java/org/janusgraph/graphdb/management/utils/ConfigurationManagementGraphSettingException.java

@@ -0,0 +1,22 @@
+// Copyright 2024 JanusGraph 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
+//
+//      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 org.janusgraph.graphdb.management.utils;
+
+public class ConfigurationManagementGraphSettingException extends RuntimeException {
+    public ConfigurationManagementGraphSettingException(String message) {
+        super(message);
+    }
+}

janusgraph-inmemory/src/test/java/org/janusgraph/core/inmemory/MisconfiguredGraphFactoryTest.java

@@ -0,0 +1,66 @@
+// Copyright 2024 JanusGraph 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
+//
+//      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 org.janusgraph.core.inmemory;
+
+import org.apache.commons.configuration2.MapConfiguration;
+import org.apache.tinkerpop.gremlin.server.Settings;
+import org.janusgraph.diskstorage.configuration.backend.CommonsConfiguration;
+import org.janusgraph.graphdb.configuration.builder.GraphDatabaseConfigurationBuilder;
+import org.janusgraph.graphdb.database.StandardJanusGraph;
+import org.janusgraph.graphdb.management.ConfigurationManagementGraph;
+import org.janusgraph.graphdb.management.JanusGraphManager;
+import org.janusgraph.graphdb.management.utils.ConfigurationManagementGraphSettingException;
+import org.janusgraph.util.system.ConfigurationUtil;
+import org.junit.jupiter.api.Test;
+
+import java.util.HashMap;
+import java.util.Map;
+
+import static org.janusgraph.graphdb.configuration.GraphDatabaseConfiguration.ALLOW_CUSTOM_VERTEX_ID_TYPES;
+import static org.janusgraph.graphdb.configuration.GraphDatabaseConfiguration.ALLOW_SETTING_VERTEX_ID;
+import static org.janusgraph.graphdb.configuration.GraphDatabaseConfiguration.STORAGE_BACKEND;
+import static org.junit.jupiter.api.Assertions.assertThrows;
+
+/**
+ * This class is dedicated to test a common configuration error people consistently make
+ * when they aim to use ConfiguredGraphFactory: their management graph config contains
+ * `graph.set-vertex-id=true` which leads to runtime error because ConfigurationManagementGraph
+ * is managed by JanusGraph internally and doesn't support custom ID
+ */
+public class MisconfiguredGraphFactoryTest {
+
+    private static JanusGraphManager gm;
+
+    protected MapConfiguration getManagementConfig() {
+        final Map<String, Object> map = new HashMap<>();
+        map.put(STORAGE_BACKEND.toStringWithoutRoot(), "inmemory");
+
+        // management graph config is not allowed to use custom vertex id
+        map.put(ALLOW_SETTING_VERTEX_ID.toStringWithoutRoot(), "true");
+        map.put(ALLOW_CUSTOM_VERTEX_ID_TYPES.toStringWithoutRoot(), "true");
+        return ConfigurationUtil.loadMapConfiguration(map);
+    }
+
+    @Test
+    public void shouldRejectInvalidConfig() throws Exception {
+        gm = new JanusGraphManager(new Settings());
+        final MapConfiguration config = getManagementConfig();
+        final StandardJanusGraph graph = new StandardJanusGraph(new GraphDatabaseConfigurationBuilder().build(new CommonsConfiguration(config)));
+
+        // Cannot instantiate the ConfigurationManagementGraph Singleton because custom vertex ID is not allowed
+        assertThrows(ConfigurationManagementGraphSettingException.class, () -> new ConfigurationManagementGraph(graph));
+    }
+}
+