起初我有一个名为person的模特。它运行良好，并在我的数据库中创建一个表。添加一个有外键的新模型后，我遇到了这个问题。我没有 dbconfig.java 。我只有一个 application.properties 。像这样。
spring.thymeleaf.mode=LEGACYHTML5
# Database
spring.datasource.url=jdbc:mysql://localhost:3306/db_example?useUnicode=true&characterEncoding=UTF-8
spring.datasource.username=root
spring.datasource.password=root
spring.datasource.driver-class-name=com.mysql.jdbc.Driver
# Hibernate
spring.jpa.show-sql=true
spring.jpa.hibernate.ddl-auto=create
spring.jpa.database-platform=org.hibernate.dialect.MySQL5Dialect
spring.jackson.serialization.indent-output=true
以下是模型
person.java
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQuery;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Entity
@NoArgsConstructor
@AllArgsConstructor
@Data
@NamedQuery(name="Person.withNameAndcollegeNamedQuery", query = "select p from Person p where p.name=?1 and p.college=?2")
public class Person {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Integer id;
private String name;
private Integer age;
private String college;
private String title;
}
项目，JAVA package com.example.model;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.NamedQuery;
import javax.persistence.OneToOne;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
@Entity
@NoArgsConstructor
@AllArgsConstructor
@Data
@NamedQuery(name="Record.withNmaeAndAddressNamedQuery", query = "select p from Record p where p.name=?1 and address=?2")
public class Project {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Integer id;
private String projectName;
@OneToOne
private Person person;
private String description;
private Subject subject;
private String date;
}
这是控制台日志：
13:30:30.244 [main] DEBUG org.springframework.boot.devtools.settings.DevToolsSettings - Included patterns for restart : []
13:30:30.247 [main] DEBUG org.springframework.boot.devtools.settings.DevToolsSettings - Excluded patterns for restart : [/spring-boot-starter/target/classes/, /spring-boot-autoconfigure/target/classes/, /spring-boot-starter-[\w-]+/, /spring-boot/target/classes/, /spring-boot-actuator/target/classes/, /spring-boot-devtools/target/classes/]
13:30:30.248 [main] DEBUG org.springframework.boot.devtools.restart.ChangeableUrls - Matching URLs for reloading : [file:/E:/workspace-sts-3.8.4.RELEASE/demo/target/classes/]
. ____ _ __ _ _
/\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
\\/ ___)| |_)| | | | | || (_| | ) ) ) )
' |____| .__|_| |_|_| |_\__, | / / / /
=========|_|==============|___/=/_/_/_/
:: Spring Boot :: (v1.5.6.RELEASE)
2017-08-11 13:30:30.474 INFO 12108 --- [ restartedMain] com.example.DemoApplication : Starting DemoApplication on MoriatyC with PID 12108 (E:\workspace-sts-3.8.4.RELEASE\demo\target\classes started by cmh in E:\workspace-sts-3.8.4.RELEASE\demo)
2017-08-11 13:30:30.475 INFO 12108 --- [ restartedMain] com.example.DemoApplication : No active profile set, falling back to default profiles: default
2017-08-11 13:30:30.652 INFO 12108 --- [ restartedMain] ationConfigEmbeddedWebApplicationContext : Refreshing org.springframework.boot.context.embedded.AnnotationConfigEmbeddedWebApplicationContext@2350e3c9: startup date [Fri Aug 11 13:30:30 CST 2017]; root of context hierarchy
2017-08-11 13:30:32.149 INFO 12108 --- [ restartedMain] s.b.c.e.t.TomcatEmbeddedServletContainer : Tomcat initialized with port(s): 8080 (http)
2017-08-11 13:30:32.157 INFO 12108 --- [ restartedMain] o.apache.catalina.core.StandardService : Starting service [Tomcat]
2017-08-11 13:30:32.158 INFO 12108 --- [ restartedMain] org.apache.catalina.core.StandardEngine : Starting Servlet Engine: Apache Tomcat/8.5.16
2017-08-11 13:30:32.230 INFO 12108 --- [ost-startStop-1] o.a.c.c.C.[Tomcat].[localhost].[/] : Initializing Spring embedded WebApplicationContext
2017-08-11 13:30:32.230 INFO 12108 --- [ost-startStop-1] o.s.web.context.ContextLoader : Root WebApplicationContext: initialization completed in 1580 ms
2017-08-11 13:30:32.350 INFO 12108 --- [ost-startStop-1] o.s.b.w.servlet.ServletRegistrationBean : Mapping servlet: 'dispatcherServlet' to [/]
2017-08-11 13:30:32.353 INFO 12108 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'characterEncodingFilter' to: [/*]
2017-08-11 13:30:32.353 INFO 12108 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'hiddenHttpMethodFilter' to: [/*]
2017-08-11 13:30:32.353 INFO 12108 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'httpPutFormContentFilter' to: [/*]
2017-08-11 13:30:32.354 INFO 12108 --- [ost-startStop-1] o.s.b.w.servlet.FilterRegistrationBean : Mapping filter: 'requestContextFilter' to: [/*]
2017-08-11 13:30:32.806 INFO 12108 --- [ restartedMain] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default'
2017-08-11 13:30:32.820 INFO 12108 --- [ restartedMain] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [
name: default
...]
2017-08-11 13:30:32.954 INFO 12108 --- [ restartedMain] org.hibernate.Version : HHH000412: Hibernate Core {5.0.12.Final}
2017-08-11 13:30:32.955 INFO 12108 --- [ restartedMain] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found
2017-08-11 13:30:32.956 INFO 12108 --- [ restartedMain] org.hibernate.cfg.Environment : HHH000021: Bytecode provider name : javassist
2017-08-11 13:30:32.988 INFO 12108 --- [ restartedMain] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2017-08-11 13:30:33.074 INFO 12108 --- [ restartedMain] org.hibernate.dialect.Dialect : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
2017-08-11 13:30:33.232 WARN 12108 --- [ restartedMain] ationConfigEmbeddedWebApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
2017-08-11 13:30:33.237 INFO 12108 --- [ restartedMain] o.apache.catalina.core.StandardService : Stopping service [Tomcat]
2017-08-11 13:30:33.249 INFO 12108 --- [ restartedMain] utoConfigurationReportLoggingInitializer :
Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-08-11 13:30:33.257 ERROR 12108 --- [ restartedMain] o.s.boot.SpringApplication : Application startup failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in class path resource [org/springframework/boot/autoconfigure/orm/jpa/HibernateJpaAutoConfiguration.class]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1628) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1078) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:857) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:543) ~[spring-context-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:693) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:360) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:303) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1118) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1107) [spring-boot-1.5.6.RELEASE.jar:1.5.6.RELEASE]
at com.example.DemoApplication.main(DemoApplication.java:13) [classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_65]
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_65]
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_65]
at java.lang.reflect.Method.invoke(Method.java:497) ~[na:1.8.0_65]
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) [spring-boot-devtools-1.5.6.RELEASE.jar:1.5.6.RELEASE]
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.persistenceException(EntityManagerFactoryBuilderImpl.java:954) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:882) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:60) ~[spring-orm-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:353) ~[spring-orm-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:370) ~[spring-orm-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:359) ~[spring-orm-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) ~[spring-beans-4.3.10.RELEASE.jar:4.3.10.RELEASE]
... 21 common frames omitted
Caused by: org.hibernate.MappingException: Could not determine type for: com.example.model.Subject, at table: project, for columns: [org.hibernate.mapping.Column(subject)]
at org.hibernate.mapping.SimpleValue.getType(SimpleValue.java:431) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
at org.hibernate.mapping.SimpleValue.isValid(SimpleValue.java:398) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
at org.hibernate.mapping.Property.isValid(Property.java:225) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:595) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
at org.hibernate.mapping.RootClass.validate(RootClass.java:265) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
at org.hibernate.boot.internal.MetadataImpl.validate(MetadataImpl.java:329) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:443) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:879) ~[hibernate-entitymanager-5.0.12.Final.jar:5.0.12.Final]
... 27 common frames omitted
问题出在哪里？
答案 0 :(得分：4)
首先，您必须创建一个Subject实体，并将其映射到Projects实体@OneToOne
添加
@OneToOne
private Subject subject;
。
<强> Subject.java
package com.example.model;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
@Entity
public class Subject {
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Integer id;
//Other fields according to your need and setter/getter
}
创建Subject实体后，您Project实体的@NamedQuery实体会出现错误，因此您必须更改下面的命名查询（您可以根据需要更改字段） ）
@NamedQuery(name="Project.withProjectNameAndDescriptionQuery", query = "select p from Project p where p.projectName=?1 and p.description=?2")
答案 1 :(得分：1)
然后问题是private Subject subject;。您将Project用于Subject实体，而列名Subject未确定。因此，如果您的实体包中存在@JoinColumn(name = "SUBJECT_ID")实体，则需要@ManyToOne
@JoinColumn(name = "CITY_ID")
private Subject subject;
，或者您也可以使用其他列进行映射。
var handler = Gmaps.build('Google', {
markers:
{clusterer: {
gridSize: 60,
maxZoom: 20,
styles: [ {
textSize: 10,
textColor: '#ff0000',
url: 'assets/creative/m1.png',
height: 60,
width: 60 }
, {
textSize: 14,
textColor: '#ffff00',
url:'assets/creative/m2.png',
height: 60,
width: 60 }
, {
textSize: 18,
textColor: '#0000ff',
url: 'assets/creative/m3.png',
width: 60,
height: 60}
]}}
});
var handler2 = Gmaps.build('Google');
var current;
function initialize(){
handler.buildMap({ internal: {id: 'map'} }, function() {
markers_json = <%=raw @hash.to_json %>;
markers = _.map(markers_json, function(marker_json){
marker = handler.addMarker(marker_json);
handler.fitMapToBounds();
_.extend(marker, marker_json);
return marker;
});
getLocation();
markers.map(function(elem, index) {
google.maps.event.addListener(elem.getServiceObject(), "click", function(evt) {
var id = elem.id,
number = elem.number,
name = elem.name,
zipcode = elem.zipcode,
latitude = elem.latitude,
longitude = elem.longitude
$(".name").html("<h3 class='panel-title'><i class='fa fa-id-card'></i>"+number+"</h3>")
$(".paneltb").html("<thead><tr><th>Panel</th><th>Location</th><th>Zip Code</th><th>Latitude</th><th>Longitude</th></tr></thead><tbody><tr><td>"+number+"</td><td>"+ name + "</td><td>"+zipcode+"</td><td>"+latitude+"</td><td>"+longitude+"</td></tr></tbody>")
pos = new google.maps.LatLng( latitude, longitude );
var div = document.getElementById('map2');
var sv = new google.maps.StreetViewPanorama(div);
sv.setPosition( pos );
sv.setVisible( true );
// find the heading by looking from the google car pos to the venue pos
var service = new google.maps.StreetViewService();
service.getPanoramaByLocation( pos, 50, function(result, status) {
if (status == google.maps.StreetViewStatus.OK)
{
carPos = result.location.latLng;
heading = google.maps.geometry.spherical.computeHeading( carPos, pos );
sv.setPov( { heading: heading, pitch: 0, zoom: 1 } );
}
})
$('#myModal').modal('show')
current = elem;
});
})
});
// Create the search box and link it to the UI element.
}
function getLocation(){
if(navigator.geolocation){
navigator.geolocation.getCurrentPosition(displayOnMap);
}
else{
navigator.geolocation.getCurrentPosition(displayOnMapError);
}
};
function displayOnMap(position){
marker2 = handler.addMarker({
lat: position.coords.latitude,
lng: position.coords.longitude,
picture: {
url: "<%= asset_path 'creative/1499326997_Untitled-2-01.png' %>",
width: 48,
height: 48
},
infowindow: "You are Here!"
});
handler.map.centerOn(marker2);
handler.getMap().setZoom(10);
};
function displayOnMapError(position){
marker2 = handler.addMarker({
lat: 34.0522,
lng: -118.2437,
picture: {
url: "<%= asset_path 'creative/1499326997_Untitled-2-01.png' %>",
width: 48,
height: 48
}
});
handler.map.centerOn(marker2);
handler.getMap().setZoom(10);
};
initialize();
答案 2 :(得分：1)
您有一个映射例外。您在subject实体中使用的字段为Person Subject类。
Hibernate无法将具有复杂类型的字段映射到简单列。它必须是一个定义和映射的实体。
因此，要解决您的问题，请将类Subject定义为实体，将其映射到DB中可能已存在的Subject表，然后指定Person和{{1}之间的关系}通过使用适当的注释（Subject或subject）和任何必需的@ManyToOne注释字段@OneToOne。
顺便提一下，如果Hibernate没有生成模式，我建议显式定义映射列（注释@JoinColumn。这样就可以更改变量名而无需更改数据库列名< / p>