java.lang.ExceptionInInitializerError logic.HibernateUtil<；clinit>；（HibernateUtil.java:16）
我已经开始学习Hibernate，出现了这样的错误：java.lang.ExceptionInInitializerError logic.HibernateUtil<；clinit>；（HibernateUtil.java:16）,java,postgresql,hibernate,servlets,Java,Postgresql,Hibernate,Servlets,我已经开始学习Hibernate，出现了这样的错误： exception javax.servlet.ServletException: Servlet execution threw an exception org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52) root cause java.lang.ExceptionInInitializerError logic.Hiberna
exception
javax.servlet.ServletException: Servlet execution threw an exception
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
java.lang.ExceptionInInitializerError
logic.HibernateUtil.<clinit>(HibernateUtil.java:16)
logic.DefaultTableDAO.getItems(DefaultTableDAO.java:38)
servlet.TestServlet.doGet(TestServlet.java:36)
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:267)
org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:231)
org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:210)
org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:51)
org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94)
org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:240)
org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:210)
org.hibernate.boot.model.process.spi.MetadataBuildingProcess.handleTypes(MetadataBuildingProcess.java:352)
org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:111)
org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:83)
org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:418)
org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:87)
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:691)
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:726)
logic.HibernateUtil.<clinit>(HibernateUtil.java:14)
logic.DefaultTableDAO.getItems(DefaultTableDAO.java:38)
servlet.TestServlet.doGet(TestServlet.java:36)
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
root cause
org.hibernate.HibernateException: Access to DialectResolutionInfo cannot be null when 'hibernate.dialect' not set
org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.determineDialect(DialectFactoryImpl.java:100)
org.hibernate.engine.jdbc.dialect.internal.DialectFactoryImpl.buildDialect(DialectFactoryImpl.java:54)
org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:137)
org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService(JdbcEnvironmentInitiator.java:35)
org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.initiateService(StandardServiceRegistryImpl.java:88)
org.hibernate.service.internal.AbstractServiceRegistryImpl.createService(AbstractServiceRegistryImpl.java:257)
org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:231)
org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:210)
org.hibernate.engine.jdbc.internal.JdbcServicesImpl.configure(JdbcServicesImpl.java:51)
org.hibernate.boot.registry.internal.StandardServiceRegistryImpl.configureService(StandardServiceRegistryImpl.java:94)
org.hibernate.service.internal.AbstractServiceRegistryImpl.initializeService(AbstractServiceRegistryImpl.java:240)
org.hibernate.service.internal.AbstractServiceRegistryImpl.getService(AbstractServiceRegistryImpl.java:210)
org.hibernate.boot.model.process.spi.MetadataBuildingProcess.handleTypes(MetadataBuildingProcess.java:352)
org.hibernate.boot.model.process.spi.MetadataBuildingProcess.complete(MetadataBuildingProcess.java:111)
org.hibernate.boot.model.process.spi.MetadataBuildingProcess.build(MetadataBuildingProcess.java:83)
org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:418)
org.hibernate.boot.internal.MetadataBuilderImpl.build(MetadataBuilderImpl.java:87)
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:691)
org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:726)
logic.HibernateUtil.<clinit>(HibernateUtil.java:14)
logic.DefaultTableDAO.getItems(DefaultTableDAO.java:38)
servlet.TestServlet.doGet(TestServlet.java:36)
javax.servlet.http.HttpServlet.service(HttpServlet.java:622)
javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
package servlet;
import logic.DefaultTable;
import logic.DefaultTableDAO;
import logic.Factory;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;
import java.sql.SQLException;
import java.util.ArrayList;
import java.util.List;
public class TestServlet extends HttpServlet {
@Override
protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
req.setCharacterEncoding("UTF-8");
List<Integer> list = new ArrayList<>();
list.add(1);
list.add(1);
list.add(1);
list.add(1);
list.add(1);
Factory factory = Factory.getInstance();
DefaultTableDAO table = factory.getItemDao();
List<DefaultTable> items = null;
try {
items = table.getItems();
} catch (SQLException e) {
e.printStackTrace();
}
req.setAttribute("listItem", list);
req.setAttribute("str", items.get(0).getPartName());
req.getRequestDispatcher("/WEB-INF/my_page.jsp").forward(req, resp);
}
@Override
protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
resp.getWriter().write("NOOOOOOOOOOOOOOOOOO");
}
}
包servlet；
导入logic.DefaultTable；
导入logic.DefaultTableDAO；
进口逻辑工厂；
导入javax.servlet.ServletException；
导入javax.servlet.http.HttpServlet；
导入javax.servlet.http.HttpServletRequest；
导入javax.servlet.http.HttpServletResponse；
导入java.io.IOException；
导入java.sql.SQLException；
导入java.util.ArrayList；
导入java.util.List；
公共类TestServlet扩展了HttpServlet{
@凌驾
受保护的void doGet（HttpServletRequest-req，HttpServletResponse-resp）抛出ServletException，IOException{
要求setCharacterEncoding（“UTF-8”）；
列表=新的ArrayList（）；
增加第（1）款；
增加第（1）款；
增加第（1）款；
增加第（1）款；
增加第（1）款；
Factory=Factory.getInstance（）；
DefaultTableDAO table=factory.getItemDao（）；
列表项=空；
试一试{
items=table.getItems（）；
}捕获（SQLE异常）{
e、 printStackTrace（）；
}
请求setAttribute（“列表项”，列表）；
setAttribute（“str”，items.get（0.getPartName（））；
req.getRequestDispatcher（“/WEB-INF/my_page.jsp”）.forward（req，resp）；
}
@凌驾
受保护的void doPost（HttpServletRequest-req，HttpServletResponse-resp）引发ServletException，IOException{
resp.getWriter（）.write（“nooooooooooo”）；
}
}
05-Nov-2016 15:44:39.412 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in 846 ms
05-Nov-2016 15:44:46.519 INFO [http-nio-80-exec-1] org.hibernate.Version.logVersion HHH000412: Hibernate Core {5.2.4.Final}
05-Nov-2016 15:44:46.522 INFO [http-nio-80-exec-1] org.hibernate.cfg.Environment.<clinit> HHH000206: hibernate.properties not found
05-Nov-2016 15:44:46.524 INFO [http-nio-80-exec-1] org.hibernate.cfg.Environment.buildBytecodeProvider HHH000021: Bytecode provider name : javassist
05-Nov-2016 15:44:46.567 INFO [http-nio-80-exec-1] org.hibernate.annotations.common.reflection.java.JavaReflectionManager.<clinit> HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
05-Nov-2016 15:44:46.730 WARN [http-nio-80-exec-1] org.hibernate.engine.jdbc.connections.internal.ConnectionProviderInitiator.initiateService HHH000181: No appropriate connection provider encountered, assuming application will be supplying connections
05-Nov-2016 15:44:46.733 WARN [http-nio-80-exec-1] org.hibernate.engine.jdbc.env.internal.JdbcEnvironmentInitiator.initiateService HHH000342: Could not obtain connection to query metadata : The application must supply JDBC connections
org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
05-Nov-2016 15:46:49.454 INFO [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.core.StandardContext.reload Reloading Context with name [] has started
05-Nov-2016 15:46:49.986 INFO [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.apache.catalina.core.StandardContext.reload Reloading Context with name [] is completed
org.hibernate.service.spi.ServiceException: Unable to create requested service [org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
2016年11月5日15:44:39.412信息[main]org.apache.catalina.startup.catalina.start服务器启动846毫秒
2016年11月5日15:44:46.519信息[http-nio-80-exec-1]org.hibernate.Version.logVersion hh000412:hibernate核心{5.2.4.Final}
2016年11月5日15:44:46.522信息[http-nio-80-exec-1]org.hibernate.cfg.Environment。HH000206:找不到hibernate.properties
2016年11月5日15:44:46.524信息[http-nio-80-exec-1]org.hibernate.cfg.Environment.buildBytecodeProvider HH000021:字节码提供程序名称：javassist
2016年11月5日15:44:46.567信息[http-nio-80-exec-1]org.hibernate.annotations.common.reflection.java.JavaReflectionManager。HCANN000001:Hibernate Commons注释{5.0.1.Final}
2016年11月5日15:44:46.730警告[http-nio-80-exec-1]org.hibernate.engine.jdbc.connections.internal.ConnectionProviderInitiator.initiateService HHH000181:假设应用程序将提供连接，则未遇到适当的连接提供程序
2016年11月5日15:44:46.733警告[http-nio-80-exec-1]org.hibernate.engine.jdbc.env.internal.jdbc环境启动器.initiateService HHH000342:无法获取查询元数据的连接：应用程序必须提供jdbc连接
org.hibernate.service.spi.ServiceException:无法创建请求的服务[org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
2016年11月5日15:46:49.454信息[ContainerBackgroundProcessor[StandardEngine[Catalina]]]org.apache.Catalina.core.StandardContext.reload已开始重新加载名为[]的上下文
2016年11月5日15:46:49.986信息[ContainerBackgroundProcessor[StandardEngine[Catalina]]]org.apache.Catalina.core.StandardContext.reload重新加载名为[]的上下文已完成
org.hibernate.service.spi.ServiceException:无法创建请求的服务[org.hibernate.engine.jdbc.env.spi.JdbcEnvironment]
hibernate.dialoguehibernate.cfg.xml <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
您可以参考当前错误是因为您没有正确配置
hibernate.dialoguehibernate.cfg.xml <property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
您可以参考我在hibernate.cfg.xml中写的，我使用的是一个站'@Entity'@Table@Id@Column etc在您的xml属性中，您缺少前缀“hibernate”。请参阅我在hibernate.cfg.xml中编写的文档，我使用了一个名称“@Entity”@Table@Id@Column在您的xml属性中，您缺少前缀“hibernate”，参考文件
<property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
hibernate.connection.driver_class = org.postgresql.Driver
hibernate.connection.url = yoururl
hibernate.connection.username = youruserid
hibernate.connection.password = yourpwd
hibernate.dialect = org.hibernate.dialect.PostgreSQLDialect