lukecwik commented on code in PR #23165:
URL: https://github.com/apache/beam/pull/23165#discussion_r984979236


##########
sdks/java/container/agent/src/main/java/org/apache/beam/agent/OpenModuleAgent.java:
##########
@@ -24,26 +24,28 @@
 import java.util.Map;
 import java.util.Set;
 
+/*
+ * Opens all base modules in the JDK to jamm (used to accurately measure 
object sizes)
+ */
 public class OpenModuleAgent {
   public static void premain(String argument, Instrumentation instrumentation) 
{
-    Set<Module> automaticModules = new HashSet<>();
     Set<Module> modulesToOpen = new HashSet<>();
+    Module jamm = ModuleLayer.boot().findModule("jamm").orElse(null);

Review Comment:
   ```suggestion
       Optional<Module> jamm = ModuleLayer.boot().findModule("jamm");
       if (!jamm.isPresent()) {
         ... log warning about expected to find jamm module ...
         return;
       }
   ```



##########
sdks/java/container/agent/src/main/java/org/apache/beam/agent/OpenModuleAgent.java:
##########
@@ -24,26 +24,28 @@
 import java.util.Map;
 import java.util.Set;
 
+/*
+ * Opens all base modules in the JDK to jamm (used to accurately measure 
object sizes)
+ */
 public class OpenModuleAgent {
   public static void premain(String argument, Instrumentation instrumentation) 
{
-    Set<Module> automaticModules = new HashSet<>();
     Set<Module> modulesToOpen = new HashSet<>();
+    Module jamm = ModuleLayer.boot().findModule("jamm").orElse(null);
     ModuleLayer.boot()
         .modules()
         .forEach(
             module -> {
-              if (module.getDescriptor().isAutomatic()) {
-                automaticModules.add(module);
-              } else if (!module.getDescriptor().isOpen()) {
+              if (!module.getDescriptor().isOpen()) {
                 modulesToOpen.add(module);
               }
             });
 
-    if (!automaticModules.isEmpty()) {
+    if (jamm != null) {
+      Set<Module> openModules = Set.of(jamm);

Review Comment:
   ```suggestion
       Set<Module> openModules = Set.of(jamm.get());
   ```



##########
sdks/java/container/agent/build.gradle:
##########
@@ -0,0 +1,82 @@
+/*
+ * 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.
+ */
+
+plugins {
+    id 'org.apache.beam.module'
+}
+applyJavaNature(
+        exportJavadoc: false,
+        publish: false
+)
+
+description = "Apache Beam :: SDKs :: Java :: Container :: Agent"
+
+jar {
+    manifest {
+        attributes("Agent-Class": "org.apache.beam.agent.OpenModuleAgent",
+                "Can-Redefine-Classes": true,
+                "Can-Retransform-Classes": true,
+                "Premain-Class": "org.apache.beam.agent.OpenModuleAgent")
+    }
+}
+
+if (project.hasProperty('java11Home')) {
+    javaVersion = "1.11"
+    def java11Home = project.findProperty('java11Home')
+    project.tasks.withType(JavaCompile) {
+        options.fork = true
+        options.forkOptions.javaHome = java11Home as File
+        options.compilerArgs += ['-Xlint:-path']
+    }
+} else if (project.hasProperty('java17Home')) {
+    javaVersion = "1.17"
+    def java17Home = project.findProperty("java17Home")
+    project.tasks.withType(JavaCompile) {

Review Comment:
   ?



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