Unwrap ExecutionException on sync update

temporal-sdk/src/main/java/io/temporal/client/WorkflowStubImpl.java

@@ -304,7 +304,10 @@ public <R> R update(String updateName, Class<R> resultClass, Object... args) {
     } catch (InterruptedException e) {
       throw new RuntimeException(e);
     } catch (ExecutionException e) {
-      throw new RuntimeException(e);
+      Throwable cause = e.getCause();
+      throw (cause instanceof RuntimeException
+          ? (RuntimeException) cause
+          : new RuntimeException(cause));
     }
   }
 

temporal-sdk/src/test/java/io/temporal/client/functional/UpdateLongPollTest.java

@@ -0,0 +1,98 @@
+/*
+ * Copyright (C) 2022 Temporal Technologies, Inc. All Rights Reserved.
+ *
+ * Copyright (C) 2012-2016 Amazon.com, Inc. or its affiliates. All Rights Reserved.
+ *
+ * Modifications copyright (C) 2017 Uber Technologies, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this material 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 io.temporal.client.functional;
+
+import static org.junit.Assert.assertThrows;
+
+import io.temporal.client.*;
+import io.temporal.failure.ApplicationFailure;
+import io.temporal.testing.internal.SDKTestWorkflowRule;
+import io.temporal.workflow.*;
+import java.time.Duration;
+import org.junit.Rule;
+import org.junit.Test;
+
+public class UpdateLongPollTest {
+  private static final int HISTORY_LONG_POLL_TIMEOUT_SECONDS = 20;
+
+  @Rule
+  public SDKTestWorkflowRule testWorkflowRule =
+      SDKTestWorkflowRule.newBuilder()
+          .setUseTimeskipping(false)
+          .setWorkflowTypes(WorkflowUpdateImpl.class)
+          .build();
+
+  @Test(timeout = 3 * HISTORY_LONG_POLL_TIMEOUT_SECONDS * 1000)
+  public void testGetUpdateResults() {
+    TestUpdatedWorkflow workflow = testWorkflowRule.newWorkflowStub(TestUpdatedWorkflow.class);
+    WorkflowClient.start(workflow::execute);
+    workflow.update(2 * HISTORY_LONG_POLL_TIMEOUT_SECONDS, false);
+    workflow.close();
+    WorkflowStub.fromTyped(workflow).getResult(Void.class);
+  }
+
+  @Test(timeout = 3 * HISTORY_LONG_POLL_TIMEOUT_SECONDS * 1000)
+  public void testGetUpdateResultsFail() {
+    TestUpdatedWorkflow workflow = testWorkflowRule.newWorkflowStub(TestUpdatedWorkflow.class);
+    WorkflowClient.start(workflow::execute);
+    assertThrows(
+        WorkflowUpdateException.class,
+        () -> workflow.update(2 * HISTORY_LONG_POLL_TIMEOUT_SECONDS, true));
+    workflow.close();
+    WorkflowStub.fromTyped(workflow).getResult(Void.class);
+  }
+
+  @WorkflowInterface
+  public interface TestUpdatedWorkflow {
+
+    @WorkflowMethod
+    String execute();
+
+    @UpdateMethod
+    void update(int sleepSeconds, boolean failUpdate);
+
+    @SignalMethod(name = "endWorkflow")
+    void close();
+  }
+
+  public static class WorkflowUpdateImpl implements TestUpdatedWorkflow {
+    CompletablePromise<Void> promise = Workflow.newPromise();
+
+    @Override
+    public String execute() {
+      promise.get();
+      return "done";
+    }
+
+    @Override
+    public void update(int sleepSeconds, boolean failUpdate) {
+      Workflow.sleep(Duration.ofSeconds(sleepSeconds));
+      if (failUpdate) {
+        throw ApplicationFailure.newFailure("test failure", "failure");
+      }
+    }
+
+    @Override
+    public void close() {
+      promise.complete(null);
+    }
+  }
+}