# Deploy Java Applications Based on Jar Packages

Workbench supports building applications in four ways: [Git Repo](create-app-git.md), Jar package, container image, and Helm chart. This article describes how to deploy a Java application via a Jar file.

## prerequisites

1. [Create a workspace](../../../ghippo/user-guide/workspace/workspace.md) and a [User](../../../ghippo/user-guide/access-control/user.md). The user needs to join this workspace and have the __Workspace Editor__ role.

2. [Create a credential](../pipeline/credential.md) for accessing the image repository, such as __registry__ .

3. Prepare an image repository, like a Harbor repository.

4. Download [daocloud-demo.jar](https://github.com/huoyinghao/filedownload/raw/main/daocloud-demo.jar).

## Steps

1. Click __Wizards__ on the left navigation bar, and then select __Build With Jar__ .

    ![Based on Jar](https://docs.daocloud.io/daocloud-docs-images/docs/en/docs/amamba/images/jar01.png)

2. Fill in the basic information with reference to the following requirements, and then click __Next__ .

    - Name: Maximum 63 characters, can only contain lowercase letters, numbers, and a separator ("-"), and must start and end with a lowercase letter or number.
    - Resource Type: Select whether the application to be created is a stateless load or a stateful load.
    - Deployment Location: Select which namespace under which cluster to deploy the application. Only clusters that exist in the current workspace can be selected.
    - Application: Select the group to which the application belongs. Empty means do not group this app.
    - Replicas: Set the number of Pods for the application.

        ![Basic Info](https://docs.daocloud.io/daocloud-docs-images/docs/en/docs/amamba/images/jar02.png)

3. Refer to the following requirements to configure the pipeline, and then click __Next__ .

    - Target Image Address: Name the target image, including the storage path of the target image, for example __release-ci.daocloud.io/test-lfj/fromjar__ .
    - Tag: Tag the target image, such as the version number __v1.0__ .
    - Credential: Select the credential to access the registry, such as __registry-credential__ .
    - JAVA_OPTS: Variables used to set JVM-related operating parameters, such as __-server -Xms2048m -Xmx2048m -Xss512k__ .
    - Build Parameters: Build parameters will be passed to the build command in the form of __--build-arg__ , which supports setting the upstream product download address and upstream mirror download address as parameters, and also supports custom arbitrary parameters.

        ![Build Pipiline](https://docs.daocloud.io/daocloud-docs-images/docs/en/docs/amamba/images/jar03.png)

4. Fill in the container configuration with reference to the following requirements, and click __Next__ .

    - Access Mode: Support access to the application only within the cluster through clusterIP, or allow access outside the cluster through NodePort, or access through a load balancer.
    - Port Settings: fill in the port number that needs to be exposed according to the actual business scenario.

        > For more detailed instructions on service configuration, please refer to [Create Service](../../../kpanda/user-guide/network/create-services.md).

    - Resource Limit: CPU and memory quotas must not exceed the remaining resources in the current workspace of the application's namespace.

    - Lifecycle: Set the commands that need to be executed when the container starts, after it starts, and before it stops. For details, please refer to [Container Lifecycle Configuration](../../../kpanda/user-guide/workloads/pod-config/lifecycle.md).

    - Health Check: used to judge the health status of containers and applications, which helps to improve the availability of applications. For details, please refer to [Container Health Check Configuration](../../../kpanda/user-guide/workloads/pod-config/health-check.md).

    - Environment Variables: Configure container parameters in Pods, add environment variables or pass configurations to Pods, etc. For details, please refer to [Container environment variable configuration](../../../kpanda/user-guide/workloads/pod-config/env-variables.md).

    - Data Storage: Configure the settings for container mounted data volumes and data persistence.

        ![Container Settings](https://docs.daocloud.io/daocloud-docs-images/docs/en/docs/amamba/images/jar04.png)

5. Refer to the following instructions to choose whether to enable advanced features, and then click __Create and Upload Jar Package__ .

    - Service Mesh: Choose whether to enable the [Service Mesh for DCE 5.0](../../../mspider/intro/index.md) module to govern microservice traffic.
    - Microservice Engine: Whether to connect the newly created application to the [DCE 5.0 Microservice Engine](../../../skoala/intro/index.md) module.
        > For the configuration of the microservice engine, please refer to [Build Microservice Application Based on Git Repository](create-app-git.md).
    - Observable: Select whether to enable grayscale publishing. For more information about canary release, please refer to [Canary Release](../release/canary.md).

        ![Advanced Settings](https://docs.daocloud.io/daocloud-docs-images/docs/en/docs/amamba/images/jar05.png)

6. Select the file to be uploaded and click __OK__ .

    ![Upload Jar](https://docs.daocloud.io/daocloud-docs-images/docs/en/docs/amamba/images/jar06.png)

7. After the creation is successful, the corresponding pipeline will be triggered to run. Click __Pipelines__ in the left navigation bar to view its running status.

    > The naming rule of the pipeline is "corresponding application name-random number". For example, the corresponding application name is __demo__ through the pipeline name __demo-4615a8__ .

    ![Pipelines](https://docs.daocloud.io/daocloud-docs-images/docs/en/docs/amamba/images/jar07.png)

8. After the pipeline is successfully executed, click __Overview__ on the left navigation bar and select the __Applications__ tab to view the newly created app.

    ![Successfully Created](https://docs.daocloud.io/daocloud-docs-images/docs/en/docs/amamba/images/jar08.png)