lukecwik commented on a change in pull request #11165: [BEAM-9340] Populate 
requirements for Java.
URL: https://github.com/apache/beam/pull/11165#discussion_r395310246
 
 

 ##########
 File path: 
runners/core-construction-java/src/main/java/org/apache/beam/runners/core/construction/SdkComponents.java
 ##########
 @@ -86,25 +91,30 @@ public static SdkComponents create(RunnerApi.Components 
components) {
   }
 
   public static SdkComponents create(PipelineOptions options) {
-    SdkComponents sdkComponents = new 
SdkComponents(RunnerApi.Components.getDefaultInstance(), "");
+    SdkComponents sdkComponents =
+        new SdkComponents(RunnerApi.Components.getDefaultInstance(), null, "");
     PortablePipelineOptions portablePipelineOptions = 
options.as(PortablePipelineOptions.class);
     sdkComponents.registerEnvironment(
         Environments.createOrGetDefaultEnvironment(portablePipelineOptions));
     return sdkComponents;
   }
 
-  private SdkComponents(RunnerApi.Components components, String newIdPrefix) {
+  private SdkComponents(
+      Components components, Collection<String> requirements, String 
newIdPrefix) {
     this.newIdPrefix = newIdPrefix;
+    this.requirements = new HashSet<>();
 
     if (components == null) {
-      return;
+      if (requirements != null) {
+        this.requirements.addAll(requirements);
+      }
+    } else {
+      mergeFrom(components, requirements);
     }
-
-    mergeFrom(components);
   }
 
   /** Merge Components proto into this SdkComponents instance. */
-  public void mergeFrom(RunnerApi.Components components) {
+  public void mergeFrom(RunnerApi.Components components, Collection<String> 
requirements) {
 
 Review comment:
   ```suggestion
     public void mergeFrom(RunnerApi.Components components, @Nullable 
Collection<String> requirements) {
   ```

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