Add bridge+agent dependencies only if those exist.

For serverless, those project dependencies don't exist, and we'll need
to add the dependencies differently, using Maven coordinates.

Author: prdoyle

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/ElasticsearchJavaBasePlugin.java

@@ -199,33 +199,43 @@ private static void configureNativeLibraryPath(Project project) {
 
     private static void configureEntitlements(Project project) {
         Configuration agentJarConfig = project.getConfigurations().create("entitlementAgentJar");
-        agentJarConfig.defaultDependencies(deps -> {
-            deps.add(project.getDependencies().project(Map.of("path", ":libs:entitlement:agent", "configuration", "default")));
-        });
+        Project agent = project.findProject(":libs:entitlement:agent");
+        if (agent != null) {
+            agentJarConfig.defaultDependencies(deps -> {
+                deps.add(project.getDependencies().project(Map.of("path", ":libs:entitlement:agent", "configuration", "default")));
+            });
+        }
         FileCollection agentFiles = agentJarConfig;
 
         Configuration bridgeJarConfig = project.getConfigurations().create("entitlementBridgeJar");
-        bridgeJarConfig.defaultDependencies(deps -> {
-            deps.add(project.getDependencies().project(Map.of("path", ":libs:entitlement:bridge", "configuration", "default")));
-        });
+        Project bridge = project.findProject(":libs:entitlement:bridge");
+        if (bridge != null) {
+            bridgeJarConfig.defaultDependencies(deps -> {
+                deps.add(project.getDependencies().project(Map.of("path", ":libs:entitlement:bridge", "configuration", "default")));
+            });
+        }
         FileCollection bridgeFiles = bridgeJarConfig;
 
         project.getTasks().withType(Test.class).configureEach(test -> {
             // See also SystemJvmOptions.maybeAttachEntitlementAgent.
 
             // Agent
-            var systemProperties = test.getExtensions().getByType(SystemPropertyCommandLineArgumentProvider.class);
-            test.dependsOn(agentFiles);
-            systemProperties.systemProperty("es.entitlement.agentJar", agentFiles.getAsPath());
-            systemProperties.systemProperty("jdk.attach.allowAttachSelf", true);
+            if (agentFiles.isEmpty() == false) {
+                var systemProperties = test.getExtensions().getByType(SystemPropertyCommandLineArgumentProvider.class);
+                test.dependsOn(agentFiles);
+                systemProperties.systemProperty("es.entitlement.agentJar", agentFiles.getAsPath());
+                systemProperties.systemProperty("jdk.attach.allowAttachSelf", true);
+            }
 
             // Bridge
-            String modulesContainingEntitlementInstrumentation = "java.logging,java.net.http,java.naming,jdk.net";
-            test.dependsOn(bridgeFiles);
-            // Tests may not be modular, but the JDK still is
-            test.jvmArgs(
-                "--add-exports=java.base/org.elasticsearch.entitlement.bridge=ALL-UNNAMED," + modulesContainingEntitlementInstrumentation
-            );
+            if (bridgeFiles.isEmpty() == false) {
+                String modulesContainingEntitlementInstrumentation = "java.logging,java.net.http,java.naming,jdk.net";
+                test.dependsOn(bridgeFiles);
+                // Tests may not be modular, but the JDK still is
+                test.jvmArgs(
+                    "--add-exports=java.base/org.elasticsearch.entitlement.bridge=ALL-UNNAMED," + modulesContainingEntitlementInstrumentation
+                );
+            }
         });
     }