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Run Instructions

Prerequisites

  • Java 17 or later
  • Maven (or use the included ./mvnw wrapper)

No external database setup needed - the app uses H2 in-memory database which is auto-configured.

Run the Application

From the module directory:

./mvnw spring-boot:run

Or from the repository root:

./mvnw spring-boot:run -pl modules/04-spring-relational-data-access

Expected Output

The app runs once and exits. You should see:

Console output showing JdbcTemplate operations

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__, | / / / /
 =========|_|==============|___/=/_/_/_/

 :: Spring Boot ::                (v4.0.0)

... INFO ... RelationalDataAccessApplication : Creating tables
... INFO ... HikariDataSource       : HikariPool-1 - Starting...
... INFO ... HikariPool             : HikariPool-1 - Added connection conn0: url=jdbc:h2:mem:...
... INFO ... HikariDataSource       : HikariPool-1 - Start completed.
... INFO ... RelationalDataAccessApplication : Inserting customer record for John Woo
... INFO ... RelationalDataAccessApplication : Inserting customer record for Jeff Dean
... INFO ... RelationalDataAccessApplication : Inserting customer record for Josh Bloch
... INFO ... RelationalDataAccessApplication : Inserting customer record for Josh Long
... INFO ... RelationalDataAccessApplication : Querying for customer records where first_name = 'Josh':
... INFO ... RelationalDataAccessApplication : Customer[id=3, firstName='Josh', lastName='Bloch']
... INFO ... RelationalDataAccessApplication : Customer[id=4, firstName='Josh', lastName='Long']

Run Tests

./mvnw test -pl modules/04-spring-relational-data-access

What's Happening

  1. Spring Boot starts and auto-configures H2 in-memory database
  2. Table created - customers table with id, first_name, last_name
  3. Data inserted - 4 customer records via batch insert
  4. Query executed - finds customers where first_name = 'Josh'
  5. Results logged - prints the 2 matching customers
  6. App exits - CommandLineRunner completes, app shuts down

Notes

  • No web server - this is a console application, no HTTP endpoints
  • In-memory database - data is lost when the app stops
  • Port - N/A (console only)

Troubleshooting

Problem Solution
java: command not found Install Java 17+
Build fails Run ./mvnw clean first
Different output Check you're on the right branch