微信公众号搜"智元新知"关注
微信扫一扫可直接关注哦！

无法实例化ID生成器[entity-name = com.jrp.pma.entities.Project]，而localhost拒绝连接到我的Spring Boot应用程序

分类：编程问答

如何解决无法实例化ID生成器[entity-name = com.jrp.pma.entities.Project]，而localhost拒绝连接到我的Spring Boot应用程序

我已经调试了几个小时，我搜索了google，StackOverflow和其他网站，但没有解决方案。每次我使用绿色按钮在eclipse中为我的项目重新启动启动服务器时，我都会进入本地主机并加载几秒钟，然后说“本地主机拒绝连接”。我已经附加了项目结构和一些相关文件，包括schema.sql，application.properties和application-test.properties文件。 project.java和employee.java在第20行有一个关于GeneratorType.SEQUENCE的行，但是在我的eclipse控制台中显示的错误之一是“无法实例化id生成器[entity-name = com.jrp.pma .entities.Project]“，我还附带了控制台错误。如果您需要查看其他文件，请告诉我。同样，项目结构也作为屏幕快照附加。我真的迷路了，如果您能找到很棒的解决方案！预先非常感谢。

project-management application file structure 

  .   ____          _            __ _ _
 /\\ / ___'_ __ _ _(_)_ __  __ _ \ \ \ \
( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
 \\/  ___)| |_)| | | | | || (_| |  ) ) ) )
  '  |____| .__|_| |_|_| |_\__,| / / / /
 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::        (v2.3.3.RELEASE)

2020-09-14 08:27:20.987  INFO 7776 --- [  restartedMain] c.jrp.pma.ProjectManagementApplication   : Starting ProjectManagementApplication on DESKTOP-C26F0I7 with PID 7776 (C:\Users\kashi\eclipse-workspace\project-management\target\classes started by kashi in C:\Users\kashi\eclipse-workspace\project-management)
2020-09-14 08:27:20.992  INFO 7776 --- [  restartedMain] c.jrp.pma.ProjectManagementApplication   : No active profile set,falling back to default profiles: default
2020-09-14 08:27:21.095  INFO 7776 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2020-09-14 08:27:21.095  INFO 7776 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2020-09-14 08:27:22.104  INFO 7776 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Bootstrapping Spring Data JPA repositories in DEFERRED mode.
2020-09-14 08:27:22.193  INFO 7776 --- [  restartedMain] .s.d.r.c.RepositoryConfigurationDelegate : Finished Spring Data repository scanning in 79ms. Found 2 JPA repository interfaces.
2020-09-14 08:27:22.991  INFO 7776 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 8080 (http)
2020-09-14 08:27:23.000  INFO 7776 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2020-09-14 08:27:23.000  INFO 7776 --- [  restartedMain] org.apache.catalina.core.StandardEngine  : Starting Servlet engine: [Apache Tomcat/9.0.37]
2020-09-14 08:27:23.110  INFO 7776 --- [  restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2020-09-14 08:27:23.110  INFO 7776 --- [  restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 2015 ms
2020-09-14 08:27:23.177  INFO 7776 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Starting...
2020-09-14 08:27:23.319  INFO 7776 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Start completed.
2020-09-14 08:27:23.326  INFO 7776 --- [  restartedMain] o.s.b.a.h2.H2ConsoleAutoConfiguration    : H2 console available at '/h2-console'. Database available at 'jdbc:postgresql://localhost:5432/pma-springbootdb'
2020-09-14 08:27:23.501  INFO 7776 --- [  restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor  : Initializing ExecutorService 'applicationTaskExecutor'
2020-09-14 08:27:23.565  INFO 7776 --- [         task-1] o.hibernate.jpa.internal.util.LogHelper  : HHH000204: Processing PersistenceUnitInfo [name: default]
2020-09-14 08:27:23.665  INFO 7776 --- [         task-1] org.hibernate.Version                    : HHH000412: Hibernate ORM core version 5.4.20.Final
2020-09-14 08:27:23.665  WARN 7776 --- [  restartedMain] JpaBaseConfiguration$JpaWebConfiguration : spring.jpa.open-in-view is enabled by default. Therefore,database queries may be performed during view rendering. Explicitly configure spring.jpa.open-in-view to disable this warning
2020-09-14 08:27:23.897  INFO 7776 --- [         task-1] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.1.0.Final}
2020-09-14 08:27:24.120  INFO 7776 --- [         task-1] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.Postgresql10Dialect
2020-09-14 08:27:24.311  INFO 7776 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2020-09-14 08:27:24.374  INFO 7776 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 8080 (http) with context path ''
2020-09-14 08:27:24.377  INFO 7776 --- [  restartedMain] DeferredRepositoryInitializationListener : Triggering deferred initialization of Spring Data repositories…
2020-09-14 08:27:24.785  WARN 7776 --- [  restartedMain] ConfigServletWebServerApplicationContext : Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'projectRepository' defined in com.jrp.pma.dao.ProjectRepository defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Cannot resolve reference to bean 'jpaMappingContext' while setting bean property 'mappingContext'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jpaMappingContext': Invocation of init method Failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.MappingException: Could not instantiate id generator [entity-name=com.jrp.pma.entities.Project]
2020-09-14 08:27:24.788  INFO 7776 --- [  restartedMain] j.LocalContainerEntityManagerfactorybean : Closing JPA EntityManagerFactory for persistence unit 'default'
2020-09-14 08:27:24.788  WARN 7776 --- [  restartedMain] o.s.b.f.support.disposableBeanAdapter    : Invocation of destroy method Failed on bean with name 'entityManagerFactory': javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.MappingException: Could not instantiate id generator [entity-name=com.jrp.pma.entities.Project]
2020-09-14 08:27:24.788  INFO 7776 --- [  restartedMain] o.s.s.concurrent.ThreadPoolTaskExecutor  : Shutting down ExecutorService 'applicationTaskExecutor'
2020-09-14 08:27:24.790  INFO 7776 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown initiated...
2020-09-14 08:27:24.797  INFO 7776 --- [  restartedMain] com.zaxxer.hikari.HikariDataSource       : HikariPool-1 - Shutdown completed.
2020-09-14 08:27:24.825  INFO 7776 --- [  restartedMain] o.apache.catalina.core.StandardService   : Stopping service [Tomcat]
2020-09-14 08:27:24.844  INFO 7776 --- [  restartedMain] ConditionEvaluationReportLoggingListener : 

Error starting ApplicationContext. To display the conditions report re-run your application with 'debug' enabled.
2020-09-14 08:27:24.861 ERROR 7776 --- [  restartedMain] o.s.boot.SpringApplication               : Application run Failed

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'projectRepository' defined in com.jrp.pma.dao.ProjectRepository defined in @EnableJpaRepositories declared on JpaRepositoriesRegistrar.EnableJpaRepositoriesConfiguration: Cannot resolve reference to bean 'jpaMappingContext' while setting bean property 'mappingContext'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jpaMappingContext': Invocation of init method Failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.MappingException: Could not instantiate id generator [entity-name=com.jrp.pma.entities.Project]
    at org.springframework.beans.factory.support.BeanDeFinitionValueResolver.resolveReference(BeanDeFinitionValueResolver.java:342) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.BeanDeFinitionValueResolver.resolveValueIfNecessary(BeanDeFinitionValueResolver.java:113) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.applyPropertyValues(AbstractAutowireCapablebeanfactory.java:1697) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.populateBean(AbstractAutowireCapablebeanfactory.java:1442) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.doCreateBean(AbstractAutowireCapablebeanfactory.java:593) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.createBean(AbstractAutowireCapablebeanfactory.java:516) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.Abstractbeanfactory.lambda$doGetBean$0(Abstractbeanfactory.java:324) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.Abstractbeanfactory.doGetBean(Abstractbeanfactory.java:322) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.Abstractbeanfactory.getBean(Abstractbeanfactory.java:202) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultListablebeanfactory.getBeansOfType(DefaultListablebeanfactory.java:624) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultListablebeanfactory.getBeansOfType(DefaultListablebeanfactory.java:612) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.data.repository.config.DeferredRepositoryInitializationListener.onApplicationEvent(DeferredRepositoryInitializationListener.java:51) ~[spring-data-commons-2.3.3.RELEASE.jar:2.3.3.RELEASE]
    at org.springframework.data.repository.config.DeferredRepositoryInitializationListener.onApplicationEvent(DeferredRepositoryInitializationListener.java:36) ~[spring-data-commons-2.3.3.RELEASE.jar:2.3.3.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.doInvokeListener(SimpleApplicationEventMulticaster.java:172) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.invokeListener(SimpleApplicationEventMulticaster.java:165) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.event.SimpleApplicationEventMulticaster.multicastEvent(SimpleApplicationEventMulticaster.java:139) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:404) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.publishEvent(AbstractApplicationContext.java:361) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishRefresh(AbstractApplicationContext.java:898) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:554) ~[spring-context-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:143) ~[spring-boot-2.3.3.RELEASE.jar:2.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:758) ~[spring-boot-2.3.3.RELEASE.jar:2.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:750) ~[spring-boot-2.3.3.RELEASE.jar:2.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:397) ~[spring-boot-2.3.3.RELEASE.jar:2.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:315) ~[spring-boot-2.3.3.RELEASE.jar:2.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1237) ~[spring-boot-2.3.3.RELEASE.jar:2.3.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1226) ~[spring-boot-2.3.3.RELEASE.jar:2.3.3.RELEASE]
    at com.jrp.pma.ProjectManagementApplication.main(ProjectManagementApplication.java:22) ~[classes/:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]
    at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:na]
    at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:na]
    at java.base/java.lang.reflect.Method.invoke(Method.java:564) ~[na:na]
    at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49) ~[spring-boot-devtools-2.3.3.RELEASE.jar:2.3.3.RELEASE]
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'jpaMappingContext': Invocation of init method Failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.MappingException: Could not instantiate id generator [entity-name=com.jrp.pma.entities.Project]
    at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.initializeBean(AbstractAutowireCapablebeanfactory.java:1794) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.doCreateBean(AbstractAutowireCapablebeanfactory.java:594) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapablebeanfactory.createBean(AbstractAutowireCapablebeanfactory.java:516) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.Abstractbeanfactory.lambda$doGetBean$0(Abstractbeanfactory.java:324) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:226) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.Abstractbeanfactory.doGetBean(Abstractbeanfactory.java:322) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.Abstractbeanfactory.getBean(Abstractbeanfactory.java:202) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.beans.factory.support.BeanDeFinitionValueResolver.resolveReference(BeanDeFinitionValueResolver.java:330) ~[spring-beans-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    ... 33 common frames omitted
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: default] Unable to build Hibernate SessionFactory; nested exception is org.hibernate.MappingException: Could not instantiate id generator [entity-name=com.jrp.pma.entities.Project]
    at org.springframework.orm.jpa.AbstractEntityManagerfactorybean.buildNativeEntityManagerFactory(AbstractEntityManagerfactorybean.java:403) ~[spring-orm-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1130) ~[na:na]
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:630) ~[na:na]
    at java.base/java.lang.Thread.run(Thread.java:832) ~[na:na]
Caused by: org.hibernate.MappingException: Could not instantiate id generator [entity-name=com.jrp.pma.entities.Project]
    at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.createIdentifierGenerator(DefaultIdentifierGeneratorFactory.java:124) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:355) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.internal.SessionFactoryImpl.lambda$new$1(SessionFactoryImpl.java:288) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.accept(ForEachOps.java:183) ~[na:na]
    at java.base/java.util.stream.ReferencePipeline$2$1.accept(ReferencePipeline.java:177) ~[na:na]
    at java.base/java.util.HashMap$ValueSpliterator.forEachRemaining(HashMap.java:1766) ~[na:na]
    at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:484) ~[na:na]
    at java.base/java.util.stream.AbstractPipeline.wrapAndcopyInto(AbstractPipeline.java:474) ~[na:na]
    at java.base/java.util.stream.ForEachOps$ForEachOp.evaluateSequential(ForEachOps.java:150) ~[na:na]
    at java.base/java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(ForEachOps.java:173) ~[na:na]
    at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234) ~[na:na]
    at java.base/java.util.stream.ReferencePipeline.forEach(ReferencePipeline.java:497) ~[na:na]
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:287) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:469) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.jpa.boot.internal.EntityManagerFactoryBuilderImpl.build(EntityManagerFactoryBuilderImpl.java:1259) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.springframework.orm.jpa.vendor.SpringHibernateJpaPersistenceProvider.createContainerEntityManagerFactory(SpringHibernateJpaPersistenceProvider.java:58) ~[spring-orm-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.orm.jpa.LocalContainerEntityManagerfactorybean.createNativeEntityManagerFactory(LocalContainerEntityManagerfactorybean.java:365) ~[spring-orm-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerfactorybean.buildNativeEntityManagerFactory(AbstractEntityManagerfactorybean.java:391) ~[spring-orm-5.2.8.RELEASE.jar:5.2.8.RELEASE]
    ... 4 common frames omitted
Caused by: org.hibernate.MappingException: The increment size of the [project_seq] sequence is set to [50] in the entity mapping while the associated database sequence increment size is [1].
    at org.hibernate.id.enhanced.SequenceStyleGenerator.configure(SequenceStyleGenerator.java:261) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    at org.hibernate.id.factory.internal.DefaultIdentifierGeneratorFactory.createIdentifierGenerator(DefaultIdentifierGeneratorFactory.java:118) ~[hibernate-core-5.4.20.Final.jar:5.4.20.Final]
    ... 21 common frames omitted

这是application-test.properties文件 

spring.h2.console.enabled=true
spring.h2.console.path=/h2-console
spring.jpa.show-sql=true 
spring.thymeleaf.cache=false
spring.datasource.url=jdbc:h2:mem:test

这是application.properties文件 

spring.datasource.url=jdbc:postgresql://localhost:5432/pma-springbootdb
spring.datasource.username=postgres
spring.datasource.password=password123

spring.datasource.initialization-mode=never

spring.jpa.hibernate.ddl-auto=none

spring.jpa.properties.hibernate.jdbc.lob.non_contextual_creation=true

spring.jpa.show-sql=true
spring.thymeleaf.cache=false

这是schema.sql文件 

CREATE SEQUENCE IF NOT EXISTS employee_seq;

CREATE TABLE IF NOT EXISTS employee (

employee_id BIGINT NOT NULL DEFAULT nextval('employee_seq') PRIMARY KEY,email VARCHAR(100) NOT NULL,first_name VARCHAR(100) NOT NULL,last_name VARCHAR(100) NOT NULL

);

CREATE SEQUENCE IF NOT EXISTS project_seq;

CREATE TABLE IF NOT EXISTS project (

project_id BIGINT NOT NULL DEFAULT nextval('project_seq') PRIMARY KEY,name VARCHAR(100) NOT NULL,stage VARCHAR(100) NOT NULL,description VARCHAR(500) NOT NULL

);


CREATE TABLE IF NOT EXISTS project_employee (

project_id BIGINT REFERENCES project,employee_id BIGINT REFERENCES employee

);

这是project.java文件 

package com.jrp.pma.entities;

import java.util.ArrayList;
import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;

@Entity
public class Project {
     
    @Id
    @GeneratedValue(strategy=GenerationType.SEQUENCE,generator="project_seq")
    private long projectId;
    private String name; 
    private String stage;//NOT STARTED,IN PROGRESS,COMPLETED
    private String description;
    
    @ManyToMany(cascade = {CascadeType.DETACH,CascadeType.MERGE,CascadeType.REFRESH,CascadeType.PERSIST},fetch = FetchType.LAZY)
    @JoinTable(name="project_employee",joinColumns=@JoinColumn(name="project_id"),inverseJoinColumns = @JoinColumn(name="employee_id"))
    
    private List<Employee> employees;
    
    public Project() {
        
    }
    
    public List<Employee> getEmployees() {
        return employees;
    }
    
    public void setEmployees(List<Employee> employees) {
        this.employees = employees;
    }
    
    public Project(String name,String stage,String description) {
        super();
        this.name = name;
        this.stage = stage;
        this.description = description;
    }


    public long getProjectId() {
        return projectId;
    }
    public void setProjectId(long projectId) {
        this.projectId = projectId;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getStage() {
        return stage;
    }
    public void setStage(String stage) {
        this.stage = stage;
    }
    public String getDescription() {
        return description;
    }
    public void setDescription(String description) {
        this.description = description;
    } 
    
    //convenience method
    public void addEmployee(Employee emp) {
        if(employees == null) {
            employees = new ArrayList<>();
        }
        employees.add(emp);
    }
    
    
    
}

这是employee.java文件 

package com.jrp.pma.entities;

import java.util.List;

import javax.persistence.CascadeType;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.JoinColumn;
import javax.persistence.JoinTable;
import javax.persistence.ManyToMany;

@Entity
public class Employee {
    
    
    @Id
    @GeneratedValue(strategy=GenerationType.SEQUENCE,generator="employee_seq")
    private long employeeId;
    
    private String firstName;
    private String lastName;
    private String email;
    
    
    @ManyToMany(cascade = {CascadeType.DETACH,joinColumns=@JoinColumn(name="employee_id"),inverseJoinColumns = @JoinColumn(name="project_id"))
    
    private List<Project> projects;
    
    public Employee() {
        
    }
    
    
    public Employee(String firstName,String lastName,String email) {
        super();
        this.firstName = firstName;
        this.lastName = lastName;
        this.email = email;
    }
    
    public long getEmployeeId() {
        return employeeId;
    }
    public List<Project> getProjects() {
        return projects;
    }


    public void setProjects(List<Project> projects) {
        this.projects = projects;
    }


    public void setEmployeeId(long employeeId) {
        this.employeeId = employeeId;
    }
    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 getEmail() {
        return email;
    }
    public void setEmail(String email) {
        this.email = email;
    }
    

    
}

版权声明：本文内容由互联网用户自发贡献，该文观点与技术仅代表作者本人。本站仅提供信息存储空间服务，不拥有所有权，不承担相关法律责任。如发现本站有涉嫌侵权/违法违规的内容， 请发送邮件至 dio@foxmail.com 举报，一经查实，本站将立刻删除。

苹果市值2025年有望达4万亿美元
pythonJavaScriptjavaHTMLreactjsC#AndroidCSSNode.jssqlrpython-3.xMysqLjQueryc++pandasFlutterangularIOSdjangolinuxswifttypescript路由器JSON路由器设置无线路由器h3c华三华三路由器设置华三路由器电脑软件教程arraysdocker软件图文教程Cvue.jslaravelspring-bootreact-native