小编Ste*_*rnK的帖子

我正在尝试在我的第一个 sprinboot 应用程序中配置 postgreSQL 数据库的属性。但是当我运行这个应用程序时，我收到以下错误：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'requestMappingHandlerAdapter' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Unsatisfied dependency expressed through method 'requestMappingHandlerAdapter' parameter 1; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'mvcConversionService' defined in class path resource [org/springframework/boot/autoconfigure/web/servlet/WebMvcAutoConfiguration$EnableWebMvcConfiguration.class]: Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiationException: Failed to instantiate [org.springframework.format.support.FormattingConversionService]: Factory method 'mvcConversionService' threw exception; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'employeeRepository' defined in com.jrp.pma.dao.EmployeeRepository defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: …

Internal Server Error: /api/orders/add/
Traceback (most recent call last):**strong t[enter image description here][1]ext**
  File "C:\Users\kalya\OneDrive\Desktop\my app\myenv\lib\site-packages\django\core\handlers\exception.py", line 55, in inner
    response = get_response(request)
  File "C:\Users\kalya\OneDrive\Desktop\my app\myenv\lib\site-packages\django\core\handlers\base.py", line 197, in _get_response      
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "C:\Users\kalya\OneDrive\Desktop\my app\myenv\lib\site-packages\django\views\decorators\csrf.py", line 54, in wrapped_view     
    return view_func(*args, **kwargs)
  File "C:\Users\kalya\OneDrive\Desktop\my app\myenv\lib\site-packages\django\views\generic\base.py", line 84, in view
    return self.dispatch(request, *args, **kwargs)
  File "C:\Users\kalya\OneDrive\Desktop\my app\myenv\lib\site-packages\rest_framework\views.py", line 509, in dispatch
    response = self.handle_exception(exc)
  File "C:\Users\kalya\OneDrive\Desktop\my app\myenv\lib\site-packages\rest_framework\views.py", line 469, in handle_exception        
    self.raise_uncaught_exception(exc)
  File "C:\Users\kalya\OneDrive\Desktop\my app\myenv\lib\site-packages\rest_framework\views.py", line 480, in …

在 Eclipse 中运行此代码时出现错误。我已经创建了Student.java文件：

public class Student {
    private int id;
    private String name;
    private String email;
    private int marks;
    
    // getters/setters
}

我已经创建了Student.hbm.xml文件：

<!DOCTYPE hibernate-mapping PUBLIC 
     "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
     "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">
          
    <hibernate-mapping>
    <class name="bean.Student" table="student">
            <id name="id" column="sid"></id>
            <property name="name"  column="sname"></property>
            <property name="email" column="semail"></property>
            <property name="marks" column="smarks"></property>
    </class>
    </hibernate-mapping>

我已经创建了hibernate.cfg.xml文件：

 <!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
        
    <hibernate-configuration>
    <session-factory>
        <property name="connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
        <property name="connection.url">jdbc:oracle:thin:@localhost:1521:wind</property>
        <property name="connection.username">localuser</property>
        <property name="connection.password">localuser</property>
        <property name="connection.poolsize">5</property>
            
        <property name="dialect">org.hibernate.dialect.OracleDialect</property>
            
        <mapping resource="resources/student.hbm.xml"/> …

我有一个Rental具有以下userId字段的实体：

@Column(name = "user_id", updatable = false, nullable = false)
private UUID userId;

我也有一个JpaRepository：

public interface RentalRepository extends JpaRepository<Rental, UUID> {

    @Query("FROM Rental r WHERE (:userId IS NULL OR r.userId = :userId) AND (:status IS NULL OR r.status = :status)")
    Page<Rental> findAllUsingFilterUserIdAndStatus(@Param("userId") UUID userId,
                                                   @Param("status") RentalStatus status,
                                                   Pageable pageable);
}

当我将userId作为 null 传递时，出现以下错误：

     org.springframework.dao.InvalidDataAccessResourceUsageException: could not extract ResultSet; SQL [n/a]; nested exception is org.hibernate.exception.SQLGrammarException: could not extract ResultSet
        at org.springframework.orm.jpa.vendor.HibernateJpaDialect.convertHibernateAccessException(HibernateJpaDialect.java:280)
        at org.springframework.orm.jpa.vendor.HibernateJpaDialect.translateExceptionIfPossible(HibernateJpaDialect.java:254) …