Minimal workflow to show UI history bug Can be run from cadence-java-sample

HelloSideEffect.java

package com.uber.cadence.samples.hello;

import com.uber.cadence.client.WorkflowClient;
import com.uber.cadence.worker.Worker;
import com.uber.cadence.workflow.QueryMethod;
import com.uber.cadence.workflow.Workflow;
import com.uber.cadence.workflow.WorkflowMethod;

import static com.uber.cadence.samples.common.SampleConstants.DOMAIN;

/**
 * Hello SideEffect Cadence workflow that sets a SideEffect. The set value can be queried Requires a local instance the
 * Cadence service to be running.
 */
public class HelloSideEffect {

  static final String TASK_LIST = "HelloSideEffect";

  /** Workflow interface has to have at least one method annotated with @WorkflowMethod. */
  public interface SideEffectWorkflow {
    @WorkflowMethod(executionStartToCloseTimeoutSeconds = 10, taskList = TASK_LIST)
    void set(String value);

    /** @return set value */
    @QueryMethod
    String get();
  }

  public static class SideEffectWorkflowImpl implements SideEffectWorkflow {

    private String value = "";

    @Override
    public void set(String value) {
      Workflow.sideEffect(String.class, () -> {return value;});
      this.value = value;
    }

    @Override
    public String get() {
      return this.value;
    }
  }

  public static void main(String[] args) {
    // Start a worker that hosts both workflow and activity implementations.
    Worker.Factory factory = new Worker.Factory(DOMAIN);
    Worker worker = factory.newWorker(TASK_LIST);
    // Workflows are stateful. So you need a type to create instances.
    worker.registerWorkflowImplementationTypes(SideEffectWorkflowImpl.class);
    // Start listening to the workflow and activity task lists.
    factory.start();

    // Start a workflow execution. Usually this is done from another program.
    WorkflowClient workflowClient = WorkflowClient.newInstance(DOMAIN);
    // Get a workflow stub using the same task list the worker uses.
    SideEffectWorkflow workflow = workflowClient.newWorkflowStub(SideEffectWorkflow.class);
    // Execute a workflow waiting for it to complete.
    workflow.set("test");
    // Query and print the set value
    System.out.println(workflow.get());
    System.exit(0);
  }
}