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我想跟随一个教程来使用PostgreSQL作为数据库与Hibernate，Tomcat作为服务器和Eclipse作为IDE的简单的Web应用程序。简单的Web应用程序使用PostgreSQL和Tomcat
的用户需要输入名字，姓氏和国家到一个简单的形式
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>My first Web App</title>
</head>
<body>
<h1>Let's create a new user</h1>
<form method="POST" action = "CreateUser.do">
First Name <input type = "text" size = "40" maxlength = "40" name = "firstname" /><br/>
Last Name <input type = "text" size = "40" maxlength = "40" name = "lastname" /><br/>
Country <input type = "text" size = "40" maxlength = "40" name = "country" /><br/>
<input type = "submit" value = "create" >
</form>
</body>
</html>
然后，我有AddUser.java作为控制器模型视图控制器模式
package controller;
import java.io.IOException;
import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.boot.registry.StandardServiceRegistryBuilder;
import org.hibernate.cfg.Configuration;
import org.hibernate.service.ServiceRegistry;
import model.User;
/**
* Servlet implementation class AddUser
*/
@WebServlet(description = "Create new user Servlet", urlPatterns = {"/CreateUser.do"})
public class AddUser extends HttpServlet {
private static final long serialVersionUID = 1L;
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
/*
RequestDispatcher view = request.getRequestDispatcher("useradd.jsp");
view.forward(request, response);
*/
Configuration config = new Configuration().configure();
ServiceRegistry servReg = new StandardServiceRegistryBuilder().applySettings(config.getProperties()).build();
SessionFactory factory = config.buildSessionFactory(servReg);
Session session = factory.openSession();
session.beginTransaction();
User u = new User(request.getParameter("firstname"),
request.getParameter("lastname"),
request.getParameter("country"));
session.save(u);
session.getTransaction().commit();
session.close();
RequestDispatcher view = request.getRequestDispatcher("useradd.jsp");
view.forward(request, response);
}
}
而且User.java为模型
package model;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;
@Entity
@Table(name = "users")
public class User {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
@Column(name="user_id", nullable=false, unique=true)
private int id;
@Column(name="firstname", length=40, nullable=false)
private String firstname;
@Column(name="lastname", length=40, nullable=false)
private String lastname;
@Column(name="country", length=40, nullable=true)
private String country;
public User(String firstName, String lastName, String country) {
firstname = firstName;
lastname = lastName;
this.country = country;
}
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getFirstName() {
return firstname;
}
public void setFirstName(String firstName) {
this.firstname = firstName;
}
public String getLastName() {
return lastname;
}
public void setLastName(String lastName) {
this.lastname = lastName;
}
public String getCountry() {
return country;
}
public void setCountry(String country) {
this.country = country;
}
}
最后，useradd.jsp作为视图和应该显示写入数据库的数据。
<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
pageEncoding="ISO-8859-1"%>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">
<title>My first Web App - New User Created!</title>
</head>
<body>
<h1>New User Created</h1>
<p>
First Name: <% String fName = request.getParameter("firstname"); out.print(fName); %> <br/>
Last Name: <% String lName = request.getParameter("lastname"); out.print(lName); %> <br/>
Country: <% String country = request.getParameter("country"); out.print(country); %> <br/>
</p>
</body>
</html>
我也在/ src文件夹中所做的hibernate.cfg.xml文件
<hibernate-configuration>
<session-factory>
<property name="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</property>
<property name="hibernate.connection.driver_class">org.postgresql.Driver</property>
<property name="hibernate.connection.url">jdbc:postgresql://localhost:5432/firstapp</property>
<property name="hibernate.connection.username">postgres</property>
<property name="hibernate.connection.password">admin</property>
<property name="show_sql">false</property>
<mapping class="model.User"/>
</session-factory>
</hibernate-configuration>
我可以在姓/名/国家运行应用程序，类型，但是，当我按下create，它会显示以下错误：HTTP状态500 - 未知实体：model.User
当然，它不会向DB写入任何内容。
这是控制台显示：
mag 13, 2016 7:20:44 PM org.apache.tomcat.util.digester.SetPropertiesRule begin
AVVERTENZA: [SetPropertiesRule]{Server/Service/Engine/Host/Context} Setting property 'source' to 'org.eclipse.jst.jee.server:2 - Hibernate' did not find a matching property.
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: Server version: Apache Tomcat/8.0.33
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: Server built: Mar 18 2016 20:31:49 UTC
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: Server number: 8.0.33.0
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: OS Name: Windows 10
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: OS Version: 10.0
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: Architecture: x86
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: Java Home: C:\Program Files (x86)\Java\jre1.8.0_91
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: JVM Version: 1.8.0_91-b14
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: JVM Vendor: Oracle Corporation
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: CATALINA_BASE: C:\Users\Antonio\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp2
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: CATALINA_HOME: C:\Program Files (x86)\Apache Software Foundation\Tomcat 8.0
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: Command line argument: -Dcatalina.base=C:\Users\Antonio\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp2
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: Command line argument: -Dcatalina.home=C:\Program Files (x86)\Apache Software Foundation\Tomcat 8.0
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: Command line argument: -Dwtp.deploy=C:\Users\Antonio\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp2\wtpwebapps
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: Command line argument: -Djava.endorsed.dirs=C:\Program Files (x86)\Apache Software Foundation\Tomcat 8.0\endorsed
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.VersionLoggerListener log
INFORMAZIONI: Command line argument: -Dfile.encoding=Cp1252
mag 13, 2016 7:20:44 PM org.apache.catalina.core.AprLifecycleListener lifecycleEvent
INFORMAZIONI: The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: C:\Program Files (x86)\Java\jre1.8.0_91\bin;C:\WINDOWS\Sun\Java\bin;C:\WINDOWS\system32;C:\WINDOWS;C:/Program Files (x86)/Java/jre1.8.0_91/bin/client;C:/Program Files (x86)/Java/jre1.8.0_91/bin;C:/Program Files (x86)/Java/jre1.8.0_91/lib/i386;C:\ProgramData\Oracle\Java\javapath;C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\WINDOWS\System32\WindowsPowerShell\v1.0\;C:\Users\Antonio\Desktop\eclipse;;.
mag 13, 2016 7:20:44 PM org.apache.coyote.AbstractProtocol init
INFORMAZIONI: Initializing ProtocolHandler ["http-nio-8080"]
mag 13, 2016 7:20:44 PM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFORMAZIONI: Using a shared selector for servlet write/read
mag 13, 2016 7:20:44 PM org.apache.coyote.AbstractProtocol init
INFORMAZIONI: Initializing ProtocolHandler ["ajp-nio-8009"]
mag 13, 2016 7:20:44 PM org.apache.tomcat.util.net.NioSelectorPool getSharedSelector
INFORMAZIONI: Using a shared selector for servlet write/read
mag 13, 2016 7:20:44 PM org.apache.catalina.startup.Catalina load
INFORMAZIONI: Initialization processed in 1448 ms
mag 13, 2016 7:20:44 PM org.apache.catalina.core.StandardService startInternal
INFORMAZIONI: Starting service Catalina
mag 13, 2016 7:20:44 PM org.apache.catalina.core.StandardEngine startInternal
INFORMAZIONI: Starting Servlet Engine: Apache Tomcat/8.0.33
mag 13, 2016 7:20:45 PM org.apache.catalina.util.SessionIdGeneratorBase createSecureRandom
INFORMAZIONI: Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [199] milliseconds.
mag 13, 2016 7:20:46 PM org.apache.jasper.servlet.TldScanner scanJars
INFORMAZIONI: At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
mag 13, 2016 7:20:46 PM org.apache.coyote.AbstractProtocol start
INFORMAZIONI: Starting ProtocolHandler ["http-nio-8080"]
mag 13, 2016 7:20:46 PM org.apache.coyote.AbstractProtocol start
INFORMAZIONI: Starting ProtocolHandler ["ajp-nio-8009"]
mag 13, 2016 7:20:46 PM org.apache.catalina.startup.Catalina start
INFORMAZIONI: Server startup in 1935 ms
mag 13, 2016 7:21:06 PM org.hibernate.Version logVersion
INFO: HHH000412: Hibernate Core {5.1.0.Final}
mag 13, 2016 7:21:06 PM org.hibernate.cfg.Environment <clinit>
INFO: HHH000206: hibernate.properties not found
mag 13, 2016 7:21:06 PM org.hibernate.cfg.Environment buildBytecodeProvider
INFO: HHH000021: Bytecode provider name : javassist
mag 13, 2016 7:21:07 PM org.hibernate.annotations.common.reflection.java.JavaReflectionManager <clinit>
INFO: HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
mag 13, 2016 7:21:08 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl configure
WARN: HHH10001002: Using Hibernate built-in connection pool (not for production use!)
mag 13, 2016 7:21:08 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001005: using driver [org.postgresql.Driver] at URL [jdbc:postgresql://localhost:5432/firstapp]
mag 13, 2016 7:21:08 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001001: Connection properties: {user=postgres, password=****}
mag 13, 2016 7:21:08 PM org.hibernate.engine.jdbc.connections.internal.DriverManagerConnectionProviderImpl buildCreator
INFO: HHH10001003: Autocommit mode: false
mag 13, 2016 7:21:08 PM org.hibernate.engine.jdbc.connections.internal.PooledConnections <init>
INFO: HHH000115: Hibernate connection pool size: 20 (min=1)
mag 13, 2016 7:21:08 PM org.hibernate.dialect.Dialect <init>
INFO: HHH000400: Using dialect: org.hibernate.dialect.PostgreSQLDialect
mag 13, 2016 7:21:09 PM org.hibernate.engine.jdbc.env.internal.LobCreatorBuilderImpl useContextualLobCreation
INFO: HHH000424: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException
mag 13, 2016 7:21:09 PM org.hibernate.type.BasicTypeRegistry register
INFO: HHH000270: Type registration [java.util.UUID] overrides previous : [email protected]
mag 13, 2016 7:21:10 PM org.apache.catalina.core.StandardWrapperValve invoke
GRAVE: Servlet.service() for servlet [controller.AddUser] in context with path [/2_-_Hibernate] threw exception
org.hibernate.MappingException: Unknown entity: model.User
at org.hibernate.internal.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:776)
at org.hibernate.internal.SessionImpl.getEntityPersister(SessionImpl.java:1533)
at org.hibernate.event.internal.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:104)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:192)
at org.hibernate.event.internal.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:38)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:177)
at org.hibernate.event.internal.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:32)
at org.hibernate.event.internal.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:73)
at org.hibernate.internal.SessionImpl.fireSave(SessionImpl.java:682)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:674)
at org.hibernate.internal.SessionImpl.save(SessionImpl.java:669)
at controller.AddUser.doPost(AddUser.java:48)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:648)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:729)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:292)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:240)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:207)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:212)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:106)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:502)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:141)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:79)
at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:616)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:88)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:522)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1095)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:672)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1502)
at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.run(NioEndpoint.java:1458)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Unknown Source)
我一直停留了几个小时，也找不到任何解决办法。
希望你们能帮助我。提前致谢！
你是如何打包和部署应用程序？ 'model/User.class'在哪里？ –