使用Liquibase Maven插件从JPA实体生成Changlog

Question

我想为我的项目添加Liquibase DB迁移支持。它也使用Spring靴。现在，我想通过使用Hibernate和JPA实体类，在没有DB连接的情况下生成changelog。但它抛出了一个错误：

mvn liquibase:generateChangeLog
[...]
Error setting up or running Liquibase: javax.persistence.PersistenceException: Unable to resolve persistence unit root URL: class path resource [] cannot be resolved to URL because it does not exist
[...]

我没有持久单元XML文件，因为这都是由Spring Boot在运行时完成的。该项目是一个多模块项目。Liquibase插件配置在父POM中。实体在子模块中。

这是Liquibase的Maven插件配置：

<plugin>
    <groupId>org.liquibase</groupId>
    <artifactId>liquibase-maven-plugin</artifactId>
    <version>${liquibase.version}</version>
    <dependencies>
        <dependency>
            <groupId>org.liquibase.ext</groupId>
            <artifactId>liquibase-hibernate5</artifactId>
            <version>3.6</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <version>2.0.0.RELEASE</version>
        </dependency>
    </dependencies>
    <configuration>
        <url>hibernate:spring:org.kitodo.mediaserver.core.db.entities?dialect=liquibase.ext.hibernate.database.HibernateGenericDialect&amp;hibernate.physical_naming_strategy=org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy&amp;hibernate.implicit_naming_strategy=org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy</url>
        <driver>liquibase.ext.hibernate.database.connection.HibernateDriver</driver>
    </configuration>
</plugin>

如果我使用DB连接而不是hibernate:spring:。。。它起作用了。

如何在没有DB连接的情况下通过实体生成变更日志？

Answer 1

我也遇到了同样的问题，为了解决这个问题，我添加了maven项目的依赖项，该项目包含您的实体。例如：

<plugin>
    <groupId>org.liquibase</groupId>
    <artifactId>liquibase-maven-plugin</artifactId>
    <version>${liquibase.version}</version>
    <dependencies>
        <dependency>
            <groupId>org.liquibase.ext</groupId>
            <artifactId>liquibase-hibernate5</artifactId>
            <version>3.6</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
            <version>2.0.0.RELEASE</version>
        </dependency>

        <!-- Add your maven project which hosts your entities classes -->
        <dependency>
            <groupId>org.kitodo.mediaserver</groupId>
            <artifactId>org.kitodo.mediaserver.core.db.entities</artifactId>
            <version>1.0.0</version>
        </dependency>

    </dependencies>
    <configuration>
        <url>hibernate:spring:org.kitodo.mediaserver.core.db.entities?dialect=liquibase.ext.hibernate.database.HibernateGenericDialect&amp;hibernate.physical_naming_strategy=org.springframework.boot.orm.jpa.hibernate.SpringPhysicalNamingStrategy&amp;hibernate.implicit_naming_strategy=org.springframework.boot.orm.jpa.hibernate.SpringImplicitNamingStrategy</url>
        <driver>liquibase.ext.hibernate.database.connection.HibernateDriver</driver>
    </configuration>
</plugin>