How to send a Query in Java

To send a Query to a Workflow Execution from an external process, call the Query method (defined in the Workflow) from a WorkflowStub within the Client code.

For example, the following Client code calls a Query method queryGreeting() defined in the GreetingWorkflow Workflow interface.

 // Create our workflow options
    WorkflowOptions workflowOptions =
        WorkflowOptions.newBuilder()
        .setWorkflowId(WORKFLOW_ID)
        .setTaskQueue(TASK_QUEUE).build();

    // Create the Temporal client stub. It is used to start our workflow execution.
    GreetingWorkflow workflow = client.newWorkflowStub(GreetingWorkflow.class, workflowOptions);

    // Start our workflow asynchronously to not use another thread to query.
    WorkflowClient.start(workflow::createGreeting, "World");

    // Query the Workflow to get the current value of greeting and print it.
    System.out.println(workflow.queryGreeting());