Spring Boot 2 - H2 Database - @SpringBootTest - Failing on org.h2.jdbc.JdbcSQLException: Table already exists

Question

Unable to test Spring Boot & H2 with a script for creation of table using schema.sql.

So, what’s happening is that I have the following properties set:

spring.datasource.driver-class-name=org.h2.Driver
spring.datasource.initialization-mode=always
spring.datasource.username=sa
spring.datasource.password=
spring.datasource.platform=h2
spring.datasource.url=jdbc:h2:mem:city;MODE=PostgreSQL;DB_CLOSE_DELAY=-1;DB_CLOSE_ON_EXIT=FALSE

spring.jpa.database-platform=org.hibernate.dialect.H2Dialect
spring.jpa.generate-ddl=false
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true

and, I expect the tables to be created using the schema.sql. The application works fine when I run gradle bootRun. However, when I run tests using gradle test, my tests for Repository passes, but the one for my Service fails stating that it’s trying to create the table when the table already exists:

Exception raised:

Caused by: org.h2.jdbc.JdbcSQLException: Table "CITY" already exists;             
SQL statement:
CREATE TABLE city ( id BIGINT NOT NULL, country VARCHAR(255) NOT NULL, map VARCHAR(255) NOT NULL, name VARCHAR(255) NOT NULL, state VARCHAR(2555) NOT NULL, PRIMARY KEY (id) ) [42101-196]
at org.h2.message.DbException.getJdbcSQLException(DbException.java:345)
at org.h2.message.DbException.get(DbException.java:179)
at org.h2.message.DbException.get(DbException.java:155)
at org.h2.command.ddl.CreateTable.update(CreateTable.java:117)
at org.h2.command.CommandContainer.update(CommandContainer.java:101)
at org.h2.command.Command.executeUpdate(Command.java:260)
at org.h2.jdbc.JdbcStatement.executeInternal(JdbcStatement.java:192)
at org.h2.jdbc.JdbcStatement.execute(JdbcStatement.java:164)
at com.zaxxer.hikari.pool.ProxyStatement.execute(ProxyStatement.java:95)
at com.zaxxer.hikari.pool.HikariProxyStatement.execute(HikariProxyStatement.java)
at org.springframework.jdbc.datasource.init.ScriptUtils.executeSqlScript(ScriptUtils.java:471)
... 105 more

The code is setup and ready to recreate the scenario. README has all the information -> https://github.com/tekpartner/learn-spring-boot-data-jpa-h2

Answer 1

If the tests are run individually, they pass. I think the problem is due to schema.sql being executed twice against the same database. It fails the second time as the tables already exist.

As a workaround, you could set spring.datasource.continue-on-error=true in application.properties.

Another option is to add the @AutoConfigureTestDatabase annotation where appropriate so that a unique embedded database is used for each test.

Answer 2

There are 2 other possible solutions you could try:

1. Add a drop table if exists [tablename] in your schema.sql before you create the table.
2. Change the statement from CREATE TABLE to CREATE TABLE IF NOT EXISTS