W-10888504: Avoid duplicating error handlers when referencing a globa…

…l error handler (#967)

src/main/java/org/mule/runtime/api/config/MuleRuntimeFeature.java

@@ -23,6 +23,7 @@
 import static org.mule.runtime.api.util.MuleSystemProperties.HANDLE_SPLITTER_EXCEPTION_PROPERTY;
 import static org.mule.runtime.api.util.MuleSystemProperties.HONOUR_RESERVED_PROPERTIES_PROPERTY;
 import static org.mule.runtime.api.util.MuleSystemProperties.PARALLEL_FOREACH_FLATTEN_MESSAGE_PROPERTY;
+import static org.mule.runtime.api.util.MuleSystemProperties.REUSE_GLOBAL_ERROR_HANDLER_PROPERTY;
 import static org.mule.runtime.api.util.MuleSystemProperties.SET_VARIABLE_WITH_NULL_VALUE_PROPERTY;
 import static org.mule.runtime.api.util.MuleSystemProperties.START_EXTENSION_COMPONENTS_WITH_ARTIFACT_CLASSLOADER_PROPERTY;
 import static org.mule.runtime.api.util.MuleSystemProperties.TO_STRING_TRANSFORMER_TRANSFORM_ITERATOR_ELEMENTS_PROPERTY;
@@ -304,6 +305,14 @@ public enum MuleRuntimeFeature implements Feature {
   VALIDATE_APPLICATION_MODEL_WITH_REGION_CLASSLOADER(
       "When enabled, the application model will be validated with the region classloader. When disabled, it will be validated with the application classloader.",
       "W-10808757", "4.5.0", VALIDATE_APPLICATION_MODEL_WITH_REGION_CLASSLOADER_PROPERTY),
+  /**
+   * When enabled, the global error handlers will be reused instead of creating local copies.
+   *
+   * @since 4.5.0
+   */
+  REUSE_GLOBAL_ERROR_HANDLER(
+      "When enabled, the global error handlers will be reused instead of creating local copies.",
+      "W-10888504", "4.5.0", REUSE_GLOBAL_ERROR_HANDLER_PROPERTY),
       ;
 
   private final String description;

src/main/java/org/mule/runtime/api/util/MuleSystemProperties.java

@@ -533,6 +533,14 @@ public final class MuleSystemProperties {
   public static final String REVERT_SIGLETON_ERROR_HANDLER_PROPERTY =
       SYSTEM_PROPERTY_PREFIX + "revert.singletonErrorHandler";
 
+  /**
+   * If set to true, the global error handlers will be reused instead of creating local copies.
+   *
+   * @since 4.5.0, 4.4.1, 4.3.1
+   */
+  public static final String REUSE_GLOBAL_ERROR_HANDLER_PROPERTY =
+      SYSTEM_PROPERTY_PREFIX + "reuse.globalErrorHandler";
+
   /**
    * @return {@code true} if the {@link #TESTING_MODE_PROPERTY_NAME} property has been set (regardless of the value)
    */