问题
In the code I have shared here Exception in thread "restartedMain" java.lang.reflect.InvocationTargetException Caused by: java.lang.NullPointerException I am getting new error. Could you please help me with this.
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
Updated one:
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
回答1:
Try the following:
- Do not mix "=" and ":" separator in the application.properties file
- Log the "db.driver" property, it seems empty
Regards.
回答2:
please share and check your xyz-servlet.xml configuration file in which you have define spring spring boot and hibernate information.after seeing your error as i understand that it is your hibernate exception in your xml file check whether you have define or not DriverClassName details see below example
check this out DB have four property driverClassName, url, username and password
<bean class="org.springframework.jdbc.datasource.DriverManagerDataSource" name="dataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>**check this property whether you have define or not if not then define it corresponding DB driver name as i have defined my driver details**
<property name="url" value="jdbc:mysql://localhost:3306/hibernatedb"/>
<property name="username" value="root"/>
<property name="password" value="root"/>
</bean>
来源：https://stackoverflow.com/questions/62278822/caused-by-java-lang-illegalargumentexception-property-driverclassname-must-n