Spring 原因：org.hibernate.tool.schema.spi.SchemaManagementException:无法对JDBC目标执行架构管理

用spring数据jpa引导。我使用@OneToMany注释作为双向。当我第一次运行这个应用程序时，它会给出预期的结果。但在第二次运行中，它试图再次创建数据库中已经存在的表。已将hbm2ddl.auto属性的属性更改为update，但仍面临相同的问题

Here is the exception that I am facing

2017-06-02 10:51:59.145  INFO 1148 --- [           main] org.hibernate.Version                    : HHH000412: Hibernate Core {5.0.12.Final}
2017-06-02 10:51:59.147  INFO 1148 --- [           main] org.hibernate.cfg.Environment            : HHH000206: hibernate.properties not found
2017-06-02 10:51:59.148  INFO 1148 --- [           main] org.hibernate.cfg.Environment            : HHH000021: Bytecode provider name : javassist
2017-06-02 10:51:59.180  INFO 1148 --- [           main] o.hibernate.annotations.common.Version   : HCANN000001: Hibernate Commons Annotations {5.0.1.Final}
2017-06-02 10:51:59.261  INFO 1148 --- [           main] org.hibernate.dialect.Dialect            : HHH000400: Using dialect: org.hibernate.dialect.MySQL5Dialect
2017-06-02 10:51:59.649  INFO 1148 --- [           main] org.hibernate.tool.hbm2ddl.SchemaUpdate  : HHH000228: Running hbm2ddl schema update
2017-06-02 10:51:59.662  INFO 1148 --- [           main] rmationExtractorJdbcDatabaseMetaDataImpl : HHH000262: Table not found: dept
2017-06-02 10:51:59.664  INFO 1148 --- [           main] rmationExtractorJdbcDatabaseMetaDataImpl : HHH000262: Table not found: dept
2017-06-02 10:51:59.673  WARN 1148 --- [           main] 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
2017-06-02 10:51:59.677  INFO 1148 --- [           main] o.apache.catalina.core.StandardService   : Stopping service Tomcat
2017-06-02 10:51:59.686  INFO 1148 --- [           main] utoConfigurationReportLoggingInitializer : 

Error starting ApplicationContext. To display the auto-configuration report re-run your application with 'debug' enabled.
2017-06-02 10:51:59.692 ERROR 1148 --- [           main] 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-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:555) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:483) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.getBean(AbstractApplicationContext.java:1081) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:856) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:542) ~[spring-context-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:122) ~[spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:737) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:370) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:314) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1162) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1151) [spring-boot-1.5.3.RELEASE.jar:1.5.3.RELEASE]
    at com.jilani.springdatajpa.SpringDataJpaApplication.main(SpringDataJpaApplication.java:33) [classes/:na]
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-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:353) ~[spring-orm-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.buildNativeEntityManagerFactory(AbstractEntityManagerFactoryBean.java:370) ~[spring-orm-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:359) ~[spring-orm-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1687) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1624) ~[spring-beans-4.3.8.RELEASE.jar:4.3.8.RELEASE]
    ... 16 common frames omitted
Caused by: org.hibernate.tool.schema.spi.SchemaManagementException: Unable to execute schema management to JDBC target [create table dept (dept_no integer not null auto_increment, dept_loc varchar(255), dept_name varchar(255), primary key (dept_no))]
    at org.hibernate.tool.schema.internal.TargetDatabaseImpl.accept(TargetDatabaseImpl.java:59) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlString(SchemaMigratorImpl.java:431) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.applySqlStrings(SchemaMigratorImpl.java:420) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.createTable(SchemaMigratorImpl.java:236) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigrationToTargets(SchemaMigratorImpl.java:167) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.tool.schema.internal.SchemaMigratorImpl.doMigration(SchemaMigratorImpl.java:60) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:134) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.tool.hbm2ddl.SchemaUpdate.execute(SchemaUpdate.java:101) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.internal.SessionFactoryImpl.<init>(SessionFactoryImpl.java:472) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    at org.hibernate.boot.internal.SessionFactoryBuilderImpl.build(SessionFactoryBuilderImpl.java:444) ~[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]
    ... 22 common frames omitted
Caused by: com.mysql.jdbc.exceptions.jdbc4.MySQLSyntaxErrorException: Table 'dept' already exists
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) ~[na:1.8.0_121]
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) ~[na:1.8.0_121]
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) ~[na:1.8.0_121]
    at java.lang.reflect.Constructor.newInstance(Constructor.java:423) ~[na:1.8.0_121]
    at com.mysql.jdbc.Util.handleNewInstance(Util.java:425) ~[mysql-connector-java-5.1.41.jar:5.1.41]
    at com.mysql.jdbc.Util.getInstance(Util.java:408) ~[mysql-connector-java-5.1.41.jar:5.1.41]
    at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:943) ~[mysql-connector-java-5.1.41.jar:5.1.41]
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3973) ~[mysql-connector-java-5.1.41.jar:5.1.41]
    at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3909) ~[mysql-connector-java-5.1.41.jar:5.1.41]
    at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2527) ~[mysql-connector-java-5.1.41.jar:5.1.41]
    at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2680) ~[mysql-connector-java-5.1.41.jar:5.1.41]
    at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2497) ~[mysql-connector-java-5.1.41.jar:5.1.41]
    at com.mysql.jdbc.StatementImpl.executeUpdateInternal(StatementImpl.java:1540) ~[mysql-connector-java-5.1.41.jar:5.1.41]
    at com.mysql.jdbc.StatementImpl.executeLargeUpdate(StatementImpl.java:2595) ~[mysql-connector-java-5.1.41.jar:5.1.41]
    at com.mysql.jdbc.StatementImpl.executeUpdate(StatementImpl.java:1468) ~[mysql-connector-java-5.1.41.jar:5.1.41]
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.8.0_121]
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[na:1.8.0_121]
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[na:1.8.0_121]
    at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_121]
    at org.apache.tomcat.jdbc.pool.StatementFacade$StatementProxy.invoke(StatementFacade.java:114) ~[tomcat-jdbc-8.5.14.jar:na]
    at com.sun.proxy.$Proxy69.executeUpdate(Unknown Source) ~[na:na]
    at org.hibernate.tool.schema.internal.TargetDatabaseImpl.accept(TargetDatabaseImpl.java:56) ~[hibernate-core-5.0.12.Final.jar:5.0.12.Final]
    ... 32 common frames omitted
==================

这是另一个实体（部门）

---

也许可以尝试其他数据库名称

mysql

是存储用户和内容的系统数据库。

import java.util.List;   
import javax.transaction.Transactional;    
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.domain.EntityScan;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.jpa.repository.config.EnableJpaRepositories;
import com.jilani.springboot.model.Department;
import com.jilani.springboot.model.Employee;
import com.jilani.springboot.repository.DepartmentRepository;
import com.jilani.springboot.repository.EmployeeRepository;

@SpringBootApplication
@ComponentScan({"com."})
@EntityScan("com.jilani.springboot.model")
@EnableJpaRepositories("com.jilani.springboot.repository")
public class SpringDataJpaApplication implements CommandLineRunner {

    @Autowired
    DepartmentRepository deptRepository;

    @Autowired
    EmployeeRepository empRepository;

    public static void main(String[] args) {
        SpringApplication.run(SpringDataJpaApplication.class, args);
    }

    @Override
    public void run(String... arg0) throws Exception {
        clearData();
        saveData();
        showData();
    }

    @Transactional
    private void clearData() {
        deptRepository.deleteAll();
        empRepository.deleteAll();
    }

    @Transactional
    private void saveData() {

        Employee hrEmp = new Employee("Jilani1", 10001, "SE1");
        Employee hrEmp1 = new Employee("Rahul1", 20001, "SSE1");

        Employee itEmp = new Employee("Manju1", 30001, "AGM1");
        Employee itEmp1 = new Employee("Rahul1", 40001, "GM1");

        Department hrDept = new Department("HR1", "HYD1");
        Department itDept = new Department("IT1", "BNG1");

        hrEmp.setDept(hrDept);
        hrEmp1.setDept(hrDept);

        itEmp.setDept(itDept);
        itEmp1.setDept(itDept);

        hrDept.getEmployees().add(hrEmp);
        hrDept.getEmployees().add(hrEmp1);

        itDept.getEmployees().add(itEmp);
        itDept.getEmployees().add(itEmp1);

        deptRepository.save(hrDept);
        deptRepository.save(itDept);

        empRepository.save(hrEmp);
        empRepository.save(hrEmp1);

        empRepository.save(itEmp);
        empRepository.save(itEmp1);

    }

    @Transactional
    private void showData() {
        List<Employee> empList = empRepository.findAll();
        List<Department> deptList = deptRepository.findAll();
        System.out.println("===================Employee List:==================");
        empList.forEach(System.out::println);    
        System.out.println("===================Department List:==================");
        deptList.forEach(System.out::println);    
    }    
}

import java.io.Serializable;
import java.util.Set;
import javax.persistence.CascadeType;
import javax.persistence.Column;
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.ManyToOne;
import javax.persistence.Table;    
import org.json.JSONObject;    
import com.fasterxml.jackson.annotation.JsonIgnoreProperties;

@Entity
@Table(name="employee")
public class Employee implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int empId;
    private String empName;
    private double empSal;
    private String job;
    @ManyToOne(fetch = FetchType.EAGER)
    //@JoinColumn(name = "dept_no")
    private Department dept;

    public Employee() {

    }

    public Employee(String empName, double empSal, String job) {
        this.empName = empName;
        this.empSal = empSal;
        this.job = job;
    }

    public Employee(String empName, double empSal, String job, Department dept){
        this.empName = empName;
        this.empSal = empSal;
        this.job = job;
        this.dept = dept;
    }

    public int getEmpId() {
        return empId;
    }

    public void setEmpId(int empId) {
        this.empId = empId;
    }

    public String getEmpName() {
        return empName;
    }

    public void setEmpName(String empName) {
        this.empName = empName;
    }

    public double getEmpSal() {
        return empSal;
    }

    public void setEmpSal(double empSal) {
        this.empSal = empSal;
    }

    public String getJob() {
        return job;
    }

    public void setJob(String job) {
        this.job = job;
    }

    public Department getDept() {
        return dept;
    }

    public void setDept(Department dept) {
        this.dept = dept;
    }

    public String toString(){
        String info = "";

        JSONObject jsonInfo = new JSONObject();
        jsonInfo.put("name",this.empName);

        JSONObject deptObj = new JSONObject();
        deptObj.put("name", this.dept.getDeptName());
        jsonInfo.put("company", deptObj);

        info = jsonInfo.toString();
        return info;
    }

}

import java.io.Serializable;
import java.util.HashSet;
import java.util.Set;    
import javax.persistence.CascadeType;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.FetchType;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.OneToMany;
import javax.persistence.Table;    
import org.json.JSONArray;
import org.json.JSONObject;

@Entity
@Table(name="dept")
public class Department implements Serializable {

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private int deptNo;
    private String deptName;
    private String deptLoc;
    @OneToMany(cascade = CascadeType.ALL, mappedBy = "dept", fetch = FetchType.EAGER)
    private Set<Employee> employees = new HashSet<Employee>();

    public Department() {

    }

    public Department(String deptName, String deptLoc) {
        this.deptName = deptName;
        this.deptLoc = deptLoc;
    }

    public Department(String deptName, String deptLoc, Set<Employee> employees){
        this.deptName = deptName;
        this.deptLoc = deptLoc;
        this.employees = employees;
    }

    public int getDeptId() {
        return deptNo;
    }

    public void setDeptId(int deptId) {
        this.deptNo = deptId;
    }

    public String getDeptName() {
        return deptName;
    }

    public void setDeptName(String deptName) {
        this.deptName = deptName;
    }

    public String getDeptLoc() {
        return deptLoc;
    }

    public void setDeptLoc(String deptLoc) {
        this.deptLoc = deptLoc;
    }

    public Set<Employee> getEmployees() {
        return employees;
    }

    public void setEmployees(Set<Employee> employees) {
        this.employees = employees;
    }

    public String toString(){
        String info = "";
        JSONObject jsonInfo = new JSONObject();
        jsonInfo.put("name",this.deptName);

        JSONArray empArray = new JSONArray();
        if(this.employees != null){
            this.employees.forEach(emp->{
                JSONObject subJson = new JSONObject();
                subJson.put("name", emp.getEmpName());
                empArray.put(subJson);
            });
        }
        jsonInfo.put("products", empArray);
        info = jsonInfo.toString();
        return info;
    }

}

spring.datasource.url=jdbc:mysql://localhost:3306/mysql?useSSL=false
spring.datasource.username=root
spring.datasource.password=root     
spring.jpa.generate-ddl=true
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect    
spring.jpa.hibernate.ddl-auto=update    
server.port=9999