上下文初始化期间遇到异常 - 取消刷新尝试：org.springframework.beans.factory.UnsatisfiedDependencyException：

Question

问题是，每次我运行项目时都会弹出org.springframework.beans.factory.UnsatisfiedDependencyException错误。

我已经在堆栈中尝试了几个与答案相关的问题，但问题尚未解决。

field data service.Java

@Component
public interface FieldDataService {
       public FieldData getFieldData() throws SQLException, Exception;

}

field data service imp了.Java

@Component
public class FieldDataServiceImpl implements FieldDataService {

    @Autowired
    FieldDataDao fieldDataDao;

    @Override
    public FieldData getFieldData() throws SQLException, Exception {
        return this.fieldDataDao.getFieldData();
    }
}

field data DAO.Java

@Component
public interface FieldDataDao {

    public FieldData getFieldData() throws SQLException, Exception;
}

field data DAO imp了.Java

@Component
public class FieldDataDaoImpl implements FieldDataDao{

    @Autowired
    private SqlSession sqlSession;

    @Override
    public FieldData getFieldData() throws SQLException, Exception {
        FieldData result = new FieldData();

        try {
            result = this.sqlSession.selectOne("getFieldData");
        } catch (Exception e) {
            e.printStackTrace();
        }
        return result;
    }
}

field data.Java

@Component
public class FieldData {

    private String transactionType;
    private String distribution;
    private Date startDate;
    private Date endDate;
    private String reportType;

    public String getTransactionType() {
        return transactionType;
    }
    public void setTransactionType(String transactionType) {
        this.transactionType = transactionType;
    }
    public String getDistribution() {
        return distribution;
    }
    public void setDistribution(String distribution) {
        this.distribution = distribution;
    }
    public Date getStartDate() {
        return startDate;
    }
    public void setStartDate(Date startDate) {
        this.startDate = startDate;
    }
    public Date getEndDate() {
        return endDate;
    }
    public void setEndDate(Date endDate) {
        this.endDate = endDate;
    }
    public String getReportType() {
        return reportType;
    }
    public void setReportType(String reportType) {
        this.reportType = reportType;
    }

    @Override
    public String toString() {
        return "FieldData [transactionType=" + transactionType + ", distribution=" + distribution + ", startDate="
                + startDate + ", endDate=" + endDate + ", reportType=" + reportType + "]";
    }
}

FieldData.xml

<mapper namespace="com.pnb.allianz.jdt.maper.FieldData">
     <resultMap id="FieldDataResultMap" type="FielData">
        <result column="LF2S_TRAN_TYPE"         property="transactionType"/>
        <result column="LF2S_DISTRIBUTION"      property="distribution"/>
        <result column="LF2S_REPORT_TYPE"   property="reportType"/>
    </resultMap>

    <select id="getFieldData" resultMap="FieldDataResultMap">
        SELECT * FROM LF2S_MR_PARAMETERS
        WHERE rownum =1
    </select>
</mapper>   

..错误就是这样

Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'generateJdtController': Unsatisfied dependency expressed through field 'fieldDataService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataServiceImpl': Unsatisfied dependency expressed through field 'fieldDataDao'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDaoImpl': Unsatisfied dependency expressed through field 'sqlSession'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'sqlSessionTemplate' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Unsatisfied dependency expressed through method 'sqlSessionTemplate' parameter 0; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataService' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\service\FieldDataService.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataService' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\service\FieldDataService.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'sqlSessionFactory': Requested bean is currently in creation: Is there an unresolvable circular reference?
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'sqlSessionFactory': Requested bean is currently in creation: Is there an unresolvable circular reference?
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataService' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\service\FieldDataService.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataService' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\service\FieldDataService.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataService' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\service\FieldDataService.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'sqlSessionFactory': Requested bean is currently in creation: Is there an unresolvable circular reference?
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'sqlSessionFactory': Requested bean is currently in creation: Is there an unresolvable circular reference?
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataService' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\service\FieldDataService.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataService' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\service\FieldDataService.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataService' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\service\FieldDataService.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'sqlSessionFactory': Requested bean is currently in creation: Is there an unresolvable circular reference?
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'sqlSessionFactory': Requested bean is currently in creation: Is there an unresolvable circular reference?
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataService' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\service\FieldDataService.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataService' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\service\FieldDataService.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataService' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\service\FieldDataService.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'sqlSessionFactory': Requested bean is currently in creation: Is there an unresolvable circular reference?
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'sqlSessionFactory': Requested bean is currently in creation: Is there an unresolvable circular reference?
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataService' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\service\FieldDataService.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'sqlSessionFactory' defined in class path resource [org/mybatis/spring/boot/autoconfigure/MybatisAutoConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.apache.ibatis.session.SqlSessionFactory]: Factory method 'sqlSessionFactory' threw exception; nested exception is java.lang.NullPointerException
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'sqlSessionFactory': Requested bean is currently in creation: Is there an unresolvable circular reference?
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataDao' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\dao\FieldDataDao.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'sqlSessionFactory': Requested bean is currently in creation: Is there an unresolvable circular reference?
Related cause: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'fieldDataService' defined in file [C:\Users\markanthony.ragay\Desktop\julia-document-tracking\julia-document-tracking\target\classes\com\pnb\allianz\jdt\service\FieldDataService.class]: Unsatisfied dependency expressed through bean property 'sqlSessionFactory'; nested exception is org.springframework.beans.factory.BeanCurrentlyInCreationException: Error creating bean with name 'sqlSessionFactory': Requested bean is currently in creation: Is there an unresolvable circular reference?
2019-04-08 14:30:32.380  INFO 2284 --- [  restartedMain] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2019-04-08 14:30:32.410  INFO 2284 --- [  restartedMain] ConditionEvaluationReportLoggingListener :

先谢谢你们。希望您能够帮助我。

Answer 1

你需要检查你的sqlSessionFactory。这个例外是NullPointerException。

您的错误消息

通过方法'sqlSessionTemplate'参数0表示不满意的依赖;嵌套异常是org.springframework.beans.factory.BeanCreationException：在类路径资源[org / mybatis / spring / boot / autoconfigure / MybatisAutoConfiguration.class]中定义名称为'sqlSessionFactory'的bean创建错误：通过工厂方法进行Bean实例化失败;嵌套异常是org.springframework.beans.BeanInstantiationException：无法实例化[org.apache.ibatis.session.SqlSessionFactory]：工厂方法'sqlSessionFactory'抛出异常;嵌套异常是java.lang.NullPointerException