SpringBoot (18) Components for selecting elements (3/3). Nested Combos (Nation-Province-City-Street...)

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SpringBoot (6) Spring Data JPA (1)

 1. application.yml This file is in the folder src/main/resources 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 spring: #--JPA datasource: #--Connection Pool hiraki: connectionTimeout: 20000 maximumPoolSize: 5 # PostgreSQL url: jdbc:postgresql://localhost:5432/mydb driver-class-name: org.postgresql.Driver username: user password: password jpa: hibernate: ddl-auto: update show-sql: true This will create or update tables 2. Defining Entities to persist There are many entries where defining entities but an Entity needs: The @Entity annotation The@Audited annotation if you want a control version The @Table (name="table_name",  schema = "myschema", uniqueConstraints..., indexes ..) All the related entities ( referenced in @OneToMany, @ManyToMany and ManyToOne) must be annotated with @Entity and @Audited (if any of the has the @Audited, then all classes should have this annotation also) Common error
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SpringBoot (10) Authentication (1). Server certificate, application.yml and Application.java

 0. Introduction The goal is to use a certificate for client authentication. So the HTTPS protocol should be used.  To use this protocol, a server certificate is needed. Let's see the steps to accomplish this target: 1. Server certificate Get a server certificate in "p12" format with a password.  Create a folder ( keystores ) in src/main/resources and place the server certificate in this folder. 2. application.yml file Here is the file ====================================================================== server : #==================================================================================== # 1. For accepting "{ }" in parameters and for accepting a long number of parameters #==================================================================================== #@see https://stackoverflow.com/a/58440058/7704658 #@see https://www.programmersought.com/article/4517808578/ tomcat : relaxed-query-chars : [ ' { ' , ' } '
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Spring Boot (2) Websockets. Subscriptions of only one member

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 1. Introduction WebSockets are useful for informing a user of the progress of a heavy process. There are a lot of blogs and videos about this question.  Spring boot uses the STOMP protocol 2. Creating the project Use Spring boot initializer  for creating the project, use these dependencies: Spring boot dev tools Lombok Spring Web Thymeleaf Websocket And use gradle format Then import it from Eclipse as File > Import > Gradle > Existing Gradle Project The final project structure after adding all the needed classes, html and js file is: 3. Add the needed dependencies to the build.gradle file Add javascript dependencies to the build.gradle implementation ' org.webjars:webjars-locator-core ' implementation ' org.webjars:sockjs-client:1.5.1 ' implementation ' org.webjars:stomp-websocket:2.3.4 ' implementation ' org.webjars:bootstrap:3.3.7 ' implementation ' org.webjars:jquery:3.6.4 ' Add also the Gson dependencies, and the build.xml file
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