Spring Boot (1) Creating an application


1. Creating a project

1. Download IntelliJ or Eclipse

2. Use Initializr to create a gradle project. An example of creating an application is:


3. Import from IntelliJ

Extrat the zip file.

File -> New -> Project from existing sources and select the build.gradle file 


The Project, editor and gradle windows are displayed.

If we try to run the application (Gradle window ->demo02 -> Tasks -> application -> bootRun) fails "application finished with non-zero exit value 1"

2- Review of web and REST concepts

URL concepts



Structure of a typical HTTP request


REST API Methods


GET            Retrieves information
POST          Creates a respource
PUT             Updates enterely a resource
PATCH        Updates partiall a resource
DELETE     Deletes a resource
HEAD          Similar to GET but has no BODY response 
OPTIONS   Gets information about communication options (permitted HTTP methods and CORS)
TRACE       For diagnostics
CONNECT Makes a 2-way connection between client and the resource


3. src/main/resources/application.properties

From DZone we get this file
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect
spring.jpa.hibernate.ddl-auto=none
spring.jpa.hibernate.show-sql=true
spring.datasource.url=jdbc:postgresql://localhost:5432/mydb
spring.datasource.driver-class-name=org.postgresql.Driver
spring.datasource.username=myUser
spring.datasource.password=myPassword

spring.datasource.initialization-mode=always
spring.datasource.initialize=true
spring.datasource.schema=classpath:/schema.sql
spring.datasource.continue-on-error=true
Make sure you have created a Postgres DB and the properties are correct!

After saving this file the program runs!  In the browser point to http://localhost/8080 and you get the WhiteLabel Error page.






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