"Cannot find database driver: Driver class was not specified and could not be determined from the url" error on using liquibase-hibernate plugin - liquibase

Question

I am trying to generate changeLog from diffs between a Database and Persistence Entities.
I am using the liquibase hibernate plugin
<plugins>
<plugin>
<groupId>org.liquibase</groupId>
<artifactId>liquibase-maven-plugin</artifactId>
<version>3.4.1</version>
<configuration>
<propertyFile>src/main/resources/liquibase.properties</propertyFile>
</configuration>
<dependencies>
<dependency>
<groupId>org.liquibase.ext</groupId>
<artifactId>liquibase-hibernate4</artifactId>
<version>3.5</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.1.7.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>1.7.3.RELEASE</version>
</dependency>
</dependencies>
</plugin>
</plugins>
and my liquibase.properties goes like this
changeLogFile=classpath:liquibase-changeLog.xml
url=jdbc:postgres://localhost:5432/oauth_reddit
username=tutorialuser
password=tutorialmy5ql
driver=org.postgresql.Driver
referenceUrl=com.sample.App
?dialect=org.hibernate.dialect.PostgreSQLDialect
diffChangeLogFile=src/main/resources/liquibase-diff-changeLog.xml
while executing mvn liquibase:diff, I am getting the following error
[ERROR] Failed to execute goal org.liquibase:liquibase-maven-plugin:3.4.1:diff (default-cli) on project prototype-liquibase-migration: Error setting up or running Liquibase: liquibase.exception.DatabaseException: java.lang.RuntimeException: Cannot find database driver: Driver class was not specified and could not be determined from the url (com.sample.App?dialect=org.hibernate.dialect.PostgreSQLDialect) -> [Help 1]
I have specified the Driver in the liquibase properties, but it seems that it is not taking.What could have I done wrong ?

Answer 1

The problem was with my referenceUrl in liquibase.properties The referenceUrl is using package scan, so the url has to start with hibernate:spring:.
I changed
referenceUrl=com.sample.App?=org.hibernate.dialect.PostgreSQLDialect
into
referenceUrl=hibernate:spring:com.sample.App?dialect=org.hibernate.dialect.PostgreSQLDialect
This solved my problem.