Add docs for usage of Jobs SDK

daprdocs/content/en/java-sdk-docs/java-jobs/_index.md

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+---
+type: docs
+title: "Jobs"
+linkTitle: "Jobs"
+weight: 3000
+description: With the Dapr Jobs package, you can interact with the Dapr Jobs APIs from a Java application to trigger future operations to run according to a predefined schedule with an optional payload. To get started, walk through the [Dapr Jobs]({{< ref java-jobs-howto.md >}}) how-to guide.
+---

daprdocs/content/en/java-sdk-docs/java-jobs/java-jobs-howto.md

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+---
+type: docs
+title: "How to: Author and manage Dapr Jobs in the Java SDK"
+linkTitle: "How to: Author and manage Jobs"
+weight: 20000
+description: How to get up and running with Jobs using the Dapr Java SDK
+---
+
+As part of this demonstration we will schedule a Dapr Job. The scheduled job will trigger an endpoint registered in the
+same app. With the [provided jobs example](https://github.com/dapr/java-sdk/tree/master/examples/src/main/java/io/dapr/examples/jobs), you will:
+
+- Schedule a Job [Job scheduling example](https://github.com/dapr/java-sdk/blob/master/examples/src/main/java/io/dapr/examples/jobs/DemoJobsClient.java)
+- Register an endpoint for the dapr sidecar to invoke at trigger time [Endpoint Registration](https://github.com/dapr/java-sdk/blob/master/examples/src/main/java/io/dapr/examples/jobs/DemoJobsSpringApplication.java)
+
+This example uses the default configuration from `dapr init` in [self-hosted mode](https://github.com/dapr/cli#install-dapr-on-your-local-machine-self-hosted).
+
+## Prerequisites
+
+- [Dapr CLI and initialized environment](https://docs.dapr.io/getting-started).
+- Java JDK 11 (or greater):
+  - [Oracle JDK](https://www.oracle.com/java/technologies/downloads), or
+  - OpenJDK
+- [Apache Maven](https://maven.apache.org/install.html), version 3.x.
+- [Docker Desktop](https://www.docker.com/products/docker-desktop)
+
+## Set up the environment
+
+Clone the [Java SDK repo](https://github.com/dapr/java-sdk) and navigate into it.
+
+```bash
+git clone https://github.com/dapr/java-sdk.git
+cd java-sdk
+```
+
+Run the following command to install the requirements for running the jobs example with the Dapr Java SDK.
+
+```bash
+mvn clean install -DskipTests
+```
+
+From the Java SDK root directory, navigate to the Dapr Jobs example.
+
+```bash
+cd examples
+```
+
+Run the Dapr sidecar.
+
+```sh
+dapr run --app-id jobsapp --dapr-grpc-port 51439 --dapr-http-port 3500 --app-port 8080
+```
+
+> Now, Dapr is listening for HTTP requests at `http://localhost:3500` and internal Jobs gRPC requests at `http://localhost:51439`.
+
+## Schedule and Get a job
+
+In the `DemoJobsClient` there are steps to schedule a job. Calling `scheduleJob` using the `DaprPreviewClient`
+will schedule a job with the Dapr Runtime. 
+
+```java
+public class DemoJobsClient {
+
+  /**
+   * The main method of this app to schedule and get jobs.
+   */
+  public static void main(String[] args) throws Exception {
+    try (DaprPreviewClient client = new DaprClientBuilder().withPropertyOverrides(overrides).buildPreviewClient()) {
+
+      // Schedule a job.
+      System.out.println("**** Scheduling a Job with name dapr-jobs-1 *****");
+      ScheduleJobRequest scheduleJobRequest = new ScheduleJobRequest("dapr-job-1",
+          JobSchedule.fromString("* * * * * *")).setData("Hello World!".getBytes());
+      client.scheduleJob(scheduleJobRequest).block();
+
+      System.out.println("**** Scheduling job dapr-jobs-1 completed *****");
+    }
+  }
+}
+```
+
+Call `getJob` to retrieve the job details that were previously created and scheduled.
+```
+client.getJob(new GetJobRequest("dapr-job-1")).block()
+```
+
+Run the `DemoJobsClient` with the following command.
+
+```sh
+java -jar target/dapr-java-sdk-examples-exec.jar io.dapr.examples.jobs.DemoJobsClient
+```
+
+### Sample output
+```
+**** Scheduling a Job with name dapr-jobs-1 *****
+**** Scheduling job dapr-jobs-1 completed *****
+**** Retrieving a Job with name dapr-jobs-1 *****
+```
+
+## Set up an endpoint to be invoked when the job is triggered
+
+The `DemoJobsSpringApplication` class starts a Spring Boot application that registers the endpoints specified in the `JobsController`
+This endpoint acts like a callback for the scheduled job requests.
+
+```java
+@RestController
+public class JobsController {
+
+  /**
+   * Handles jobs callback from Dapr.
+   *
+   * @param jobName name of the job.
+   * @param payload data from the job if payload exists.
+   * @return Empty Mono.
+   */
+  @PostMapping("/job/{jobName}")
+  public Mono<Void> handleJob(@PathVariable("jobName") String jobName,
+                              @RequestBody(required = false) byte[] payload) {
+    System.out.println("Job Name: " + jobName);
+    System.out.println("Job Payload: " + new String(payload));
+
+    return Mono.empty();
+  }
+}
+```
+
+Parameters:
+
+* `jobName`: The name of the triggered job.
+* `payload`: Optional payload data associated with the job (as a byte array).
+
+Run the Spring Boot application with the following command.
+
+```sh
+java -jar target/dapr-java-sdk-examples-exec.jar io.dapr.examples.jobs.DemoJobsSpringApplication
+```
+
+### Sample output
+```
+Job Name: dapr-job-1
+Job Payload: Hello World!
+```
+
+## Delete a scheduled job
+
+```java
+public class DemoJobsClient {
+
+  /**
+   * The main method of this app deletes a job that was previously scheduled.
+   */
+  public static void main(String[] args) throws Exception {
+    try (DaprPreviewClient client = new DaprClientBuilder().buildPreviewClient()) {
+
+      // Delete a job.
+      System.out.println("**** Delete a Job with name dapr-jobs-1 *****");
+      client.deleteJob(new DeleteJobRequest("dapr-job-1")).block();
+    }
+  }
+}
+```
+
+## Next steps
+- [Learn more about Jobs]({{< ref jobs-overview.md >}})
+- [Jobs API reference]({{< ref jobs_api.md >}})