More a development template than a usable billing application.
Demonstration of a model driven and process based development on an actual Java stack.
Adapt the connection.properties configuration for an existing PostgreSQL database.
Or use a local dockerized PostgreSQL
# docker run --rm --name billing-postgres -p 5432:5432 -e POSTGRES_PASSWORD=postgres -e POSTGRES_DB=billing postgres:9
All database changes are managed with Flyway migrations.
Retrieve the actual migration meta data from the configured database with the Flyway Maven Plugin
$ mvn -P migration initialize flyway:info
Migrate the database to the latest version.
$ mvn -P migration initialize flyway:migrate
Build the whole project with all Maven modules.
$ mvn clean install
Start the service with the Spring Boot Maven Plugin
$ cd service && mvn spring-boot:run
- IntelliJ IDEA to code and for SQL
- Swagger Editor for Open API definitions
- Camunda Modeler for BPMN definitions
- Apache JMeter for integration testing and benchmarking
Change your database and record the necessary statements in Flyway SQL Migrations
$ ls -al migrations/src/main/resources/db/migration/
...
-rw-r--r-- 1 dgf dgf 77 ago 4 12:59 V1__Create_extensions_and_schema.sql
-rw-r--r-- 1 dgf dgf 549 ago 4 12:59 V2__Create_invoice_table.sql
...
Adapt your changes with the Flyway Maven Plugin
$ cd migrations && mvn clean initialize flyway:migrate
Generate JPA entity classes for the actual connected database with the Hibernate Tools Maven Plugin
$ cd persistence && mvn clean verify
Adapt the OpenAPI 2.0 definition specification/api.yaml
Generate the JAX-RS interfaces and POJOs with the Swagger Codegen Maven Plugin
$ cd specification && mvn clean verify
- JAX-RS 2.1 + JPA 2.1 https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html
- OpenAPI 2.0 https://github.com/OAI/OpenAPI-Specification/blob/master/versions/2.0.md#data-types
- GraphQL June 2018 Edition http://facebook.github.io/graphql/June2018/#sec-Type-System
- PostgreSQL 9.4
| Common name | OpenAPI 2.0 | JAX-RS 2.1 | JPA 2.1 | PostgreSQL 9.4 | Restrictions |
|---|---|---|---|---|---|
| integer | integer > int32 | j.l.Integer | short | smallint | 2 bytes: -32768 to +32767 |
| integer | integer > int32 | j.l.Integer | j.l.Integer | integer | 4 bytes: -2147483648 to +2147483647 |
| long | integer > int64 | j.l.Long | j.l.Long | bigint | 8 bytes: -9223372036854775808 to +9223372036854775807 |
| string | string | j.l.String | j.l.String | varchar(n) | n characters |
| UUID | string | j.l.String | j.u.UUID | uuid | 16 bytes |
| date | string > date | j.t.LocalDate | j.t.LocalDate | date | 4713 BC to 5874897 AD |
| date time | string > date-time | j.t.OffsetDateTime | j.t.OffsetDateTime | timestamp | 4713 BC 294276 AD 1 microsecond / 14 digits |
Event: A call of Maven results in the following error:
$ mvn clean install
...
[ERROR] Failed to execute goal org.hibernate:hibernate-tools-maven-plugin:5.3.4.Final:hbm2java
(Entity generation) on project persistence: Execution Entity generation of goal
org.hibernate:hibernate-tools-maven-plugin:5.3.4.Final:hbm2java failed:
Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]:
Error calling Driver#connect: Connection to localhost:5432 refused.
Check that the hostname and port are correct and that the postmaster is accepting TCP/IP connections.
Connection refused (Connection refused) -> [Help 1]
Solution: check the connection parameters and the access to your database from the machine the service should run on.
- re-add custom revengStrategy parameter for the Hibernate Codegen configuration, see hibernate/hibernate-tools#1017
- support Java long value literal restrictions for the @Min and @Max annotations in Swagger Codegen
- support referenced type definitions in Swagger Codegen to reuse common restrictions like year and code