Spring data JPA with HSQLDB: user lacks privilege or object not found

user74416 :

I'm trying to setup a simple Database with an article which may contains comments with Spring Data JPA. However as soon as I enable the comment relation on the article Hibernate throws an exception:

o.h.t.s.i.ExceptionHandlerLoggedImpl     : GenerationTarget encountered exception accepting command : Error executing DDL via JDBC Statement

org.hibernate.tool.schema.spi.CommandAcceptanceException: Error executing DDL via JDBC Statement    at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:67) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
[...]
Caused by: java.sql.SQLSyntaxErrorException: user lacks privilege or object not found: PUBLIC.ARTICLE_COMMENTS
at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) ~[hsqldb-2.4.1.jar:2.4.1]
at org.hsqldb.jdbc.JDBCUtil.sqlException(Unknown Source) ~[hsqldb-2.4.1.jar:2.4.1]
at org.hsqldb.jdbc.JDBCStatement.fetchResult(Unknown Source) ~[hsqldb-2.4.1.jar:2.4.1]
at org.hsqldb.jdbc.JDBCStatement.execute(Unknown Source) ~[hsqldb-2.4.1.jar:2.4.1]
at com.zaxxer.hikari.pool.ProxyStatement.execute(ProxyStatement.java:95) ~[HikariCP-2.7.9.jar:na]
at com.zaxxer.hikari.pool.HikariProxyStatement.execute(HikariProxyStatement.java) ~[HikariCP-2.7.9.jar:na]
at org.hibernate.tool.schema.internal.exec.GenerationTargetToDatabase.accept(GenerationTargetToDatabase.java:54) ~[hibernate-core-5.2.17.Final.jar:5.2.17.Final]
... 157 common frames omitted

My article class looks as follows:

@Entity
public class Article {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    private String name;
    private String abstractText;
    private String author;
    private Date createdAt;
    private int visibility;
    private int likes;
    private int views;
    private int commentCount;
    @OneToMany(cascade=CascadeType.ALL)
    private List<Comment> comments;
    // getters and setters omitted
}

And the Comment:

@Entity
public class Comment {

    @Id
    @GeneratedValue(strategy=GenerationType.IDENTITY)
    private int id;
    private String commentText;
    private Date createdAt;
}

And the pom contains dependencies to HSQLDB, PostgreSQL, Spring Boot Starter Data JPA and Spring Boot Starter Web:

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-web</artifactId>
</dependency>

<dependency>
    <groupId>org.hsqldb</groupId>
    <artifactId>hsqldb</artifactId>
    <scope>runtime</scope>
</dependency>

<dependency>
    <groupId>org.postgresql</groupId>
    <artifactId>postgresql</artifactId>
    <scope>runtime</scope>
</dependency>

When I remove the relation to the Comment List, it works. Any suggestions?

user74416 :

Seems like the spring.jpa.hibernate.ddl-auto property were the problem. Spring defaults it to create-drop for in-memory databases. However, in the current Spring Boot or HSQLDB or Hibernate version (or maybe the combination?) this seems to cause problems. After changing the value to update, it just works fine.