HibernateException：当'hibernate.dialect'未设置时，对DialectResolutionInfo的访问不能为null [英] HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set

问题描述

使用maven创建一个Hibernate测试项目。

当我运行该项目时，它会生成异常：

  org.hibernate.engine.jdbc.connections.internal.ConnectionProviderInitiator initiateService 
 WARN：HHH000181：假设应用程序将提供连接
 org，没有遇到适当的连接提供者。 hibernate.HibernateException：当'hibernate.dialect'没有在org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect中设置
时，对DialectResolutionInfo的访问不能为空。
 at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect（DialectFactoryImpl.java:71）
 at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure（JdbcServicesImpl.java:209）
在org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService（StandardServiceRegistryImpl.java:89）
位于org.hibernate.service.internal.AbstractServiceRegistryImpl.init在org.hibernate.cfg.Configuration.buildTypeRegistrations中配置
（Configuration.java：AbstractServiceRegistryImpl.java:206）
在org.hibernate.service.internal.AbstractServiceRegistryImpl.getService（AbstractServiceRegistryImpl.java:178） 1885年）
在org.hibernate.cfg.Configuration.buildSessionFactory（Configuration.java:1843）
在org.hibernate.hibernatetest.App.main（App.java:33）
例外线程mainjava.lang.NullPointerException 
在org.hibernate.hibernatetest.App.main（App.java:51）
  

但是在主类中设置了所需的属性。不知道为什么程序是genrAating异常。

主要类：

  public class App {
 
 public static void main（String [] args）{
配置配置; 
 ServiceRegistry serviceRegistry; 
 SessionFactory sessionFactory; 
会话会话=空; 
尝试{
 configuration = new Configuration（）; 
 
 
 serviceRegistry = new StandardServiceRegistryBuilder（）。applySettings（configuration.getProperties（））。build（）; 
 configuration.setProperty（hibernate.dialect，com.applerao.hibernatesqlite.dialect.SQLiteDialect）; 
 configuration.setProperty（hibernate.connection.url，jdbc：sqlite：TailorDB.db）; 
 configuration.setProperty（hibernate.connection.driver_class，org.sqlite.JDBC）; 
 configuration.setProperty（hibernate.connection.username，）; 
 configuration.setProperty（hibernate.connection.password，）; 
 sessionFactory = configuration.buildSessionFactory（serviceRegistry）; 
 
 session = sessionFactory.openSession（）; 
 
 CustomerModel c = new CustomerModel（）; 
 c.setID（5）; 
 c.setNIC_Number（691201631345）; 
 c.setFirstName（Zee）; 
 c.setNumber（55225522）; 
 c.setLastName（Jan）; 
 c.setCustomerCode（Zee-123）; 
 
 session.beginTransaction（）; 
 session.save（c）; 
 session.getTransaction（）。commit（）; 
} catch（HibernateException e）{
 e.printStackTrace（）; 
} finally {
 session.close（）; 
 
 
 
 
 
在POM文件中： p> 
 
 
 <依赖项> 
< dependency> 
< groupId> org.hibernate< / groupId> 
< artifactId> hibernate-core< / artifactId> 
< version> 4.3.0.Final< / version> 
< /依赖关系> 
< dependency> 
< groupId> org.xerial< / groupId> 
< artifactId> sqlite-jdbc< / artifactId> 
< version> 3.7.2< / version> 
< /依赖关系> 
< dependency> 
< groupId> com.applerao< / groupId> 
< artifactId> hibernatesqlite< / artifactId> 
< version> 1.0< / version> 
< /依赖关系> 
< /依赖关系> 
  
任何想法都可以解决问题。
 
 
  CustomerModel cLass： 
 
 
  @Entity 
 @Table（name =Customer）
 
 public class CustomerModel {
 
 @Id 
 @GeneratedValue 
 @Column（name =c_id）
 int ID; 
 @Column（name =c_code）
字符串customerCode; 
 @Column（name =c_fname）
字符串firstName; 
 @Column（name =c_mname）
 String middleName; 
 @Column（name =c_lname）
 String lastName; 
 @Column（name =c_nic）
字符串NIC_Number; 
 @Column（name =c_email）
字符串电子邮件; 
 @Column（name =c_pnumber）
字符串编号; 
 
  
 
 
解决方案
您没有初始化配置，serviceRegistry和sessionFactory。 
从Hibernate 4.3.2.Final开始，引入了StandardServiceRegistryBuilder。请按照此顺序进行初始化，例如： 
 
 
  Configuration configuration = new Configuration（）; 
 configuration.configure（com / jeecourse / config / hibernate.cfg.xml）; 
 
 ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder（）。applySettings（
 configuration.getProperties（））。build（）; 
 sessionFactory = configuration.buildSessionFactory（serviceRegistry）; 
  
所以在你的代码中，你错过了： configuration.configure（） 。
 
Creating a Hibernate Test Project using maven.

when i run the project, it generates Exception:
org.hibernate.engine.jdbc.connections.internal.ConnectionProviderInitiator initiateService
WARN: HHH000181: No appropriate connection provider encountered, assuming application will be supplying connections
org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:104)
at org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:71)
at org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:209)
at org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:89)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:206)
at org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:178)
at org.hibernate.cfg.Configuration.buildTypeRegistrations(Configuration.java:1885)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1843)
at org.hibernate.hibernatetest.App.main(App.java:33)
Exception in thread "main" java.lang.NullPointerException
at org.hibernate.hibernatetest.App.main(App.java:51) 
But in main class required properties are set.don't know why programme is genrAating exception.

Main Class:
public class App {

public static void main(String[] args) {
    Configuration configuration;
    ServiceRegistry serviceRegistry;
    SessionFactory sessionFactory;
    Session session = null;
    try {
        configuration = new Configuration();


        serviceRegistry = new StandardServiceRegistryBuilder().applySettings(configuration.getProperties()).build();
        configuration.setProperty("hibernate.dialect ", "com.applerao.hibernatesqlite.dialect.SQLiteDialect");
        configuration.setProperty("hibernate.connection.url ", "jdbc:sqlite:TailorDB.db");
        configuration.setProperty("hibernate.connection.driver_class ", "org.sqlite.JDBC");
        configuration.setProperty("hibernate.connection.username ", "");
        configuration.setProperty("hibernate.connection.password ", "");
        sessionFactory = configuration.buildSessionFactory(serviceRegistry);

        session = sessionFactory.openSession();

        CustomerModel c = new CustomerModel();
        c.setID(5);
        c.setNIC_Number("691201631345");
        c.setFirstName("Zee");
        c.setNumber("55225522");
        c.setLastName("Jan");
        c.setCustomerCode("Zee-123");

        session.beginTransaction();
        session.save(c);
        session.getTransaction().commit();
    } catch (HibernateException e) {
        e.printStackTrace();
    } finally {
        session.close();
    }
}
}
In POM file:
<dependencies>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>4.3.0.Final</version>
    </dependency>
    <dependency>
        <groupId>org.xerial</groupId>
        <artifactId>sqlite-jdbc</artifactId>
        <version>3.7.2</version>
    </dependency>
    <dependency>
        <groupId>com.applerao</groupId>
        <artifactId>hibernatesqlite</artifactId>
        <version>1.0</version>
    </dependency>
</dependencies>
Any idea where the problem can be??

CustomerModel cLass:
@Entity
@Table(name = "Customer")

public class CustomerModel {

@Id
@GeneratedValue
@Column(name = "c_id")
int ID;
@Column(name = "c_code")
String customerCode;
@Column(name = "c_fname")
String firstName;
@Column(name = "c_mname")
String middleName;
@Column(name = "c_lname")
String lastName;
@Column(name = "c_nic")
String NIC_Number;
@Column(name = "c_email")
String email;
@Column(name = "c_pnumber")
String number;
}

解决方案
You didn't initialize configuration, serviceRegistry, and sessionFactory correctly.
From Hibernate 4.3.2.Final, StandardServiceRegistryBuilder is introduced. Please follow this order to initialize, e.g.
    Configuration configuration = new Configuration();
    configuration.configure("com/jeecourse/config/hibernate.cfg.xml");

    ServiceRegistry serviceRegistry = new StandardServiceRegistryBuilder().applySettings(
            configuration.getProperties()).build();
    sessionFactory = configuration.buildSessionFactory(serviceRegistry);
So in your code, you missed the step: configuration.configure().

                        
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