FAQ Questions on Spring Boot

How to control logging with Spring Boot?

By default, the SLF4j Logging is included in the Spring Boot starter package. To enable logging, create a application.properties file in the root of the resources folder.

1. application.properties

logging.level.org.springframework.web=ERROR

logging.level.com.waheedtechblog=DEBUG

# Logging pattern for the console

logging.pattern.console= "%d{yyyy-MM-dd HH:mm:ss} - %msg%n"

# Logging pattern for file

logging.pattern.file= "%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n"

logging.file=/Users/waheed/application.log

Similarly we can configure in application.yml as well.

2. application.yml

logging:

  level:

    org.springframework.web: ERROR

    com.waheedtechblog: DEBUG

  pattern:

    console: "%d{yyyy-MM-dd HH:mm:ss} - %msg%n"

    file: "%d{yyyy-MM-dd HH:mm:ss} [%thread] %-5level %logger{36} - %msg%n"

  file: /Users/waheed/application.log

3.  Classic Logback.xml

If you don’t like the Spring Boot logging template, just create a standard logback.xml in the root of the resources folder or root of the classpath. This will override the Spring Boot logging template.

How to run Spring boot application to custom port ?
In application.properties, add following property.

            Server.port=9090

How to configure datasource using Spring boot?
• Use either spring-boot-starter-jdbc or spring-boot-starterdata-jpa and include a JDBC driver on classpath
• Declare properties

1.      spring.datasource.url=jdbc:mysql://localhost/test

2.      spring.datasource.username=dbuser

3.      spring.datasource.password=dbpass

4.      spring.datasource.driver-class-name=com.mysql.jdbc.Driver

– Spring Boot will create a DataSource with properties set
– Will even use a connection pool if the library is found on the classpath!

How to change Context Path?

To change the context path, update server.contextPath properties either in application.properties file or application.yaml file.

Application.properties

server.port=8080

server.contextPath=/application

application.yaml

server:

  port: 8080

  contextPath: /application