Integrate Java driver examples into CI testing

- Move examples from gremlin-driver to gremlin-server test sources
- Add DriverExamplesIntegrateTest to run examples against test server
- Change examples to use System.getProperty for test compatibility
- Update ModernTraversals to use gmodern traversal source
- Remove compiler exclusion for examples in gremlin-driver pom

Author: kirill-stepanishin

gremlin-driver/pom.xml

@@ -268,11 +268,6 @@ limitations under the License.
             <plugin>
                 <groupId>org.apache.maven.plugins</groupId>
                 <artifactId>maven-compiler-plugin</artifactId>
-                <configuration>
-                    <excludes>
-                        <exclude>examples/**</exclude>
-                    </excludes>
-                </configuration>
             </plugin>
         </plugins>
     </build>

gremlin-driver/src/main/java/examples/pom.xml

@@ -29,9 +29,9 @@ Licensed to the Apache Software Foundation (ASF) under one
 import static org.apache.tinkerpop.gremlin.process.traversal.AnonymousTraversalSource.traversal;
 
 public class BasicGremlin {
-    static final String SERVER_HOST = System.getenv().getOrDefault("GREMLIN_SERVER_HOST", "localhost");
-    static final int SERVER_PORT = Integer.parseInt(System.getenv().getOrDefault("GREMLIN_SERVER_PORT", "8182"));
-    static final String VERTEX_LABEL = System.getenv().getOrDefault("VERTEX_LABEL", "person");
+    static final String SERVER_HOST = System.getProperty("GREMLIN_SERVER_HOST", "localhost");
+    static final int SERVER_PORT = Integer.parseInt(System.getProperty("GREMLIN_SERVER_PORT", "8182"));
+    static final String VERTEX_LABEL = System.getProperty("VERTEX_LABEL", "person");
 
     public static void main(String[] args) throws Exception {
         Cluster cluster = Cluster.build(SERVER_HOST).port(SERVER_PORT).create();

…src/main/java/examples/BasicGremlin.java …src/test/java/examples/BasicGremlin.javagremlin-driver/src/main/java/examples/BasicGremlin.java renamed to gremlin-server/src/test/java/examples/BasicGremlin.java gremlin-driver/src/main/java/examples/BasicGremlin.java renamed to gremlin-server/src/test/java/examples/BasicGremlin.java

@@ -35,9 +35,9 @@ Licensed to the Apache Software Foundation (ASF) under one
 import static org.apache.tinkerpop.gremlin.process.traversal.AnonymousTraversalSource.traversal;
 
 public class Connections {
-    static final String SERVER_HOST = System.getenv().getOrDefault("GREMLIN_SERVER_HOST", "localhost");
-    static final int SERVER_PORT = Integer.parseInt(System.getenv().getOrDefault("GREMLIN_SERVER_PORT", "8182"));
-    static final String VERTEX_LABEL = System.getenv().getOrDefault("VERTEX_LABEL", "connection");
+    static final String SERVER_HOST = System.getProperty("GREMLIN_SERVER_HOST", "localhost");
+    static final int SERVER_PORT = Integer.parseInt(System.getProperty("GREMLIN_SERVER_PORT", "8182"));
+    static final String VERTEX_LABEL = System.getProperty("VERTEX_LABEL", "connection");
 
     public static void main(String[] args) throws Exception {
         withEmbedded();

…/src/main/java/examples/Connections.java …/src/test/java/examples/Connections.javagremlin-driver/src/main/java/examples/Connections.java renamed to gremlin-server/src/test/java/examples/Connections.java gremlin-driver/src/main/java/examples/Connections.java renamed to gremlin-server/src/test/java/examples/Connections.java

@@ -33,13 +33,13 @@ Licensed to the Apache Software Foundation (ASF) under one
 import static org.apache.tinkerpop.gremlin.structure.T.id;
 
 public class ModernTraversals {
-    static final String SERVER_HOST = System.getenv().getOrDefault("GREMLIN_SERVER_HOST", "localhost");
-    static final int SERVER_PORT = Integer.parseInt(System.getenv().getOrDefault("GREMLIN_SERVER_PORT", "8182"));
+    static final String SERVER_HOST = System.getProperty("GREMLIN_SERVER_HOST", "localhost");
+    static final int SERVER_PORT = Integer.parseInt(System.getProperty("GREMLIN_SERVER_PORT", "8182"));
 
     public static void main(String[] args) throws Exception {
         // Performs basic traversals on the Modern toy graph loaded on the server
         Cluster cluster = Cluster.build(SERVER_HOST).port(SERVER_PORT).create();
-        GraphTraversalSource g = traversal().withRemote(DriverRemoteConnection.using(cluster, "g"));
+        GraphTraversalSource g = traversal().withRemote(DriverRemoteConnection.using(cluster, "gmodern"));
 
         List<Edge> e1 = g.V(1).bothE().toList(); // (1)
         List<Edge> e2 = g.V(1).bothE().where(otherV().hasId(2)).toList(); // (2)

…main/java/examples/ModernTraversals.java …test/java/examples/ModernTraversals.javagremlin-driver/src/main/java/examples/ModernTraversals.java renamed to gremlin-server/src/test/java/examples/ModernTraversals.java gremlin-driver/src/main/java/examples/ModernTraversals.java renamed to gremlin-server/src/test/java/examples/ModernTraversals.java

@@ -0,0 +1,77 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you 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.apache.tinkerpop.gremlin.driver;
+
+import examples.BasicGremlin;
+import examples.Connections;
+import examples.ModernTraversals;
+import org.apache.tinkerpop.gremlin.server.AbstractGremlinServerIntegrationTest;
+import org.junit.AfterClass;
+import org.junit.BeforeClass;
+import org.junit.Test;
+
+import static org.junit.Assert.fail;
+
+/**
+ * Integration tests for driver examples to ensure they work with the current driver.
+ * These tests catch breaking changes that would affect example code.
+ */
+public class DriverExamplesIntegrateTest extends AbstractGremlinServerIntegrationTest {
+
+    @BeforeClass
+    public static void setUpEnvironment() {
+        // Set environment variables for examples to connect to test server
+        System.setProperty("GREMLIN_SERVER_HOST", "localhost");
+        System.setProperty("GREMLIN_SERVER_PORT", "45940");
+    }
+
+    @AfterClass
+    public static void tearDownAfterClass() {
+        // Clean up system properties
+        System.clearProperty("GREMLIN_SERVER_HOST");
+        System.clearProperty("GREMLIN_SERVER_PORT");
+    }
+
+    @Test
+    public void shouldRunBasicGremlinExample() throws Exception {
+        try {
+            BasicGremlin.main(new String[]{});
+        } catch (Exception e) {
+            fail("BasicGremlin example failed: " + e.getMessage());
+        }
+    }
+
+    @Test
+    public void shouldRunModernTraversalsExample() throws Exception {
+        try {
+            ModernTraversals.main(new String[]{});
+        } catch (Exception e) {
+            fail("ModernTraversals example failed: " + e.getMessage());
+        }
+    }
+
+    @Test
+    public void shouldRunConnectionsExample() throws Exception {
+        try {
+            Connections.main(new String[]{});
+        } catch (Exception e) {
+            fail("Connections example failed: " + e.getMessage());
+        }
+    }
+}