Simple Java Application for YugabyteDB

The application connects to your YugabyteDB instance via topology-aware JDBC driver and performs basic SQL operations. The instructions below are provided for YugabyteDB Managed deployments. If you use a different type of deployment, then update the /src/main/resources/app.properties file with proper connection parameters.

Prerequisite

Java Development Kit, version 8 or later
Maven 3.0 or later
Command line tool or your favourite IDE, such as IntelliJ IDEA, or Eclipse.

Start YugabyteDB Managed Cluster

Start YugabyteDB Managed instance. Free tier exists.
Add an IP address of your machine/laptop to the IP allow list

Clone App From GitHub

Clone the application to your machine:

git clone https://github.com/yugabyte/yugabyte-simple-java-app.git && cd yugabyte-simple-java-app

Provide Cluster Connection Parameters

The application needs to establish a secured connection to your YugabyteDB Managed instance.

Open the app.properties file and specify the following configuration parameters:

host - the hostname of your cluster instance.
port - the port number that will be used by the JDBC driver (the default is 5433)
dbUser - the database username you used for your instance.
dbPassword - the database password.
sslMode - the SSL mode. Set to verify-full for YugabyteDB Managed deployments.
sslRootCert - a full path to your CA root cert (for example, /Users/dmagda/certificates/root.crt)

Note, you can easily find all the settings on the YugabyteDB Managed dashboard:

Build and Run App

Build the app with Maven:
```
mvn clean package
```

Run the app:

java -cp target/yugabyte-simple-java-app-1.0-SNAPSHOT.jar SampleApp

Upon successful execution, you will see output similar to the following:

>>>> Successfully connected to YugabyteDB!
>>>> Successfully created DemoAccount table.
>>>> Selecting accounts:
name = Jessica, age = 28, country = USA, balance = 10000
name = John, age = 28, country = Canada, balance = 9000

>>>> Transferred 800 between accounts.
>>>> Selecting accounts:
name = Jessica, age = 28, country = USA, balance = 9200
name = John, age = 28, country = Canada, balance = 9800

Explore App Logic

Congrats! You successfully executed a simple Java app that works with YugabyteDB.

Now, explore the source code of the SampleApp.java file:

main method - establishes a connection with your cloud instance via JDBC driver.
createDatabase method - creates a table and populates it with sample data.
selectAccounts method - queries the data with SQL SELECT statements.
transferMoneyBetweenAccounts method - updates records consistently with distributed transactions.

Questions or Issues?

Having issues running this application or want to learn more from Yugabyte experts?

Join our Slack channel, or raise a question on StackOverflow and tag the question with yugabytedb!

KennyNg-19/yugabyte-simple-java-app