@ConditionalOnBean(name= “dataSource”) should be replaced with @ConditionalOnBean (DataSource.class) for greater flexibility.

@ConditionalOnBean(name= “dataSource”) should be replaced with

@ConditionalOnMissingBean (DataSource.class) for greater flexibility.

The @Bean annotation should be removed.

A JdbcTemplate bean will be created when the DataSource class is in the classpath but there is no

DataSource bean.

A JdbcTemplate bean will be created when a bean named dataSource has already been created.

Used to designate the location of the application.properties file in a Spring Boot application.

Used to easily look up and return a single property value from some external property file.

Used to designate the file directory of the application.properties file in a Spring Boot application.

Used to add a set of name/value pairs to the Spring Environment from an external source.

Ensure a valid bean name in the @Component annotation is specified.

Ensure a valid @ComponentScan annotation in the Java configuration is specified.

Ensure a valid @Scope for the class is specified.

Ensure a valid @Bean for the class is specified.

Annotate the update() handler method with @PutMapping(“/store/orders/{id”}”, HttpStatus.NO_CONTENT).

Annotate the update() handler method with @ResponseStatus(HttpStatus.NO_CONTENT).

Annotate the update() handler method with @ResponseEntity(204).

The update() handler method cannot return a void type, it must return a ResponseEntity type.

Starts a new transaction but throws an exception if an active transaction already exists.

Joins a transaction if one already exists; throws an exception if an active transaction does not exist.

Starts a new transaction; if an active transaction already exists, it is suspended.

Runs in a nested transaction if an active transaction exists; throws an exception if an active transaction does not exist.

spring-boot-devtools

spring-boot-initializr

spring-boot-starter-devtools

spring-boot-restart