问 由: java.lang.IllegalArgumentException:属性'driverClassName‘引起的不能为空

EN

在我在这里共享的代码中， Exception in thread "restartedMain" java.lang.reflect.InvocationTargetException Caused by: java.lang.NullPointerException 我得到了新的错误。你能帮帮我吗。

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'springLogging3Application': Unsatisfied dependency expressed through field 'factory'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'factory' defined in com.spring.main.SpringLogging3Application: Unsatisfied dependency expressed through method 'getSessionFactory' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'datasource' defined in com.spring.main.SpringLogging3Application: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.sql.DataSource]: Circular reference involving containing bean 'springLogging3Application' - consider declaring the factory method as static for independence from its containing instance. Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalArgumentException: Property 'driverClassName' must not be empty
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:598) ~[spring-beans-5.1.15.RELEASE.jar:5.1.15.RELEASE]
Caused by: org.springframework.beans.BeanInstantiationException: Failed to instantiate [javax.sql.DataSource]: Circular reference involving containing bean 'springLogging3Application' - consider declaring the factory method as static for independence from its containing instance. Factory method 'dataSource' threw exception; nested exception is java.lang.IllegalArgumentException: Property 'driverClassName' must not be empty
    at org.springframework.beans.factory.support.SimpleInstantiationStrategy.instantiate(SimpleInstantiationStrategy.java:185) ~[spring-beans-5.1.15.RELEASE.jar:5.1.15.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.instantiate(ConstructorResolver.java:622) ~[spring-beans-5.1.15.RELEASE.jar:5.1.15.RELEASE]
    ... 51 common frames omitted
Caused by: java.lang.IllegalArgumentException: Property 'driverClassName' must not be empty
    at org.springframework.util.Assert.hasText(Assert.java:284) ~[spring-core-5.1.15.RELEASE.jar:5.1.15.RELEASE]

application.properties

server.port=6565
db.driver:oracle.jdbc.driver.OracleDriver
db.url:jdbc:oracle:thin:@localhost:1521:xe  
db.username:xxxx  
db.password:xxxx
hibarenate.dialect:org.hibernate.dialect.OracleDialect
hibarenate.show_sql:true  
hibarenate.hbm2ddl.auto:update
entitymanager.packagesToScan:com.spring.main

更新的一份：

server.port=6565
db.driver=oracle.jdbc.driver.OracleDriver
db.url=jdbc:oracle:thin:@localhost:1521:xe  
db.username=xxxx 
db.password=xxxx
hibarenate.dialect=org.hibernate.dialect.OracleDialect
hibarenate.show_sql=true  
hibarenate.hbm2ddl.auto=update