休眠與JPA不創建表

Question

我很沮喪，春季啓動 - 休眠不是自動創建一個最簡單的程序表。

@Entity 
@Table(name = "Question") 
public class Question { 
    @Id 
    @GeneratedValue(strategy = GenerationType.IDENTITY) 
    String id; 

    String name; 

    // Default constructor 

    // Parametrized constrcutor 

    // Getters-Setters 
} 

主文件...

@SpringBootApplication 
public class DbTestApplication { 

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

Application.properties

# Datasource 
spring.datasource.driverClassName=org.postgresql.Driver 
spring.datasource.url=jdbc:postgresql://127.0.0.1:5432/test 
spring.datasource.username=scott 
spring.datasource.password=tiger 
spring.jpa.generate-ddl=true 
spring.jpa.hibernate.ddl-auto=create-drop 
spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect 

控制檯：

. ____   _   __ _ _ 
/\\/___'_ __ _ _(_)_ __ __ _ \ \ \ \ 
(()\___ | '_ | '_| | '_ \/ _` | \ \ \ \ 
\\/ ___)| |_)| | | | | || (_| | )))) 
    ' |____| .__|_| |_|_| |_\__, |//// 
=========|_|==============|___/=/_/_/_/ 
:: Spring Boot ::  (v1.5.4.RELEASE) 

2017-06-24 23:58:05.497 INFO 4842 --- [   main] org.example.hotel.DbTestApplication  : Starting DbTestApplication on PC192-168-2-107 with PID 4842 (/Users/bhalchandra/Documents/workspace-sts-3.8.3.RELEASE/DbTest/target/classes started by bhalchandra in /Users/bhalchandra/Documents/workspace-sts-3.8.3.RELEASE/DbTest) 
2017-06-24 23:58:05.504 INFO 4842 --- [   main] org.example.hotel.DbTestApplication  : No active profile set, falling back to default profiles: default 
2017-06-24 23:58:05.571 INFO 4842 --- [   main] s.c.a.AnnotationConfigApplicationContext : Refreshing org.springframework.context.annotation.AnnotationConfigApplicationContext@2f490758: startup date [Sat Jun 24 23:58:05 CEST 2017]; root of context hierarchy 
2017-06-24 23:58:06.755 INFO 4842 --- [   main] j.LocalContainerEntityManagerFactoryBean : Building JPA container EntityManagerFactory for persistence unit 'default' 
2017-06-24 23:58:06.778 INFO 4842 --- [   main] o.hibernate.jpa.internal.util.LogHelper : HHH000204: Processing PersistenceUnitInfo [ 
    name: default 
    ...] 
2017-06-24 23:58:06.862 INFO 4842 --- [   main] org.hibernate.Version     : HHH000412: Hibernate Core {5.0.12.Final} 
2017-06-24 23:58:06.864 INFO 4842 --- [   main] org.hibernate.cfg.Environment   : HHH000206: hibernate.properties not found 
2017-06-24 23:58:06.866 INFO 4842 --- [   main] org.hibernate.cfg.Environment   : HHH000021: Bytecode provider name : javassist 
2017-06-24 23:58:06.914 INFO 4842 --- [   main] o.hibernate.annotations.common.Version : HCANN000001: Hibernate Commons Annotations {5.0.1.Final} 
2017-06-24 23:58:07.071 INFO 4842 --- [   main] org.hibernate.dialect.Dialect   : HHH000400: Using dialect: org.hibernate.dialect.PostgreSQLDialect 
2017-06-24 23:58:07.446 INFO 4842 --- [   main] o.h.e.j.e.i.LobCreatorBuilderImpl  : HHH000424: Disabling contextual LOB creation as createClob() method threw error : java.lang.reflect.InvocationTargetException 
2017-06-24 23:58:07.448 INFO 4842 --- [   main] org.hibernate.type.BasicTypeRegistry  : HHH000270: Type registration [java.util.UUID] overrides previous : org.hibernate.type.UUIDBinaryType@53b98ff6 
2017-06-24 23:58:07.922 INFO 4842 --- [   main] org.hibernate.tool.hbm2ddl.SchemaExport : HHH000227: Running hbm2ddl schema export 
2017-06-24 23:58:07.936 INFO 4842 --- [   main] org.hibernate.tool.hbm2ddl.SchemaExport : HHH000230: Schema export complete 
2017-06-24 23:58:07.996 INFO 4842 --- [   main] j.LocalContainerEntityManagerFactoryBean : Initialized JPA EntityManagerFactory for persistence unit 'default' 
2017-06-24 23:58:08.364 INFO 4842 --- [   main] o.s.j.e.a.AnnotationMBeanExporter  : Registering beans for JMX exposure on startup 
2017-06-24 23:58:08.380 INFO 4842 --- [   main] org.example.hotel.DbTestApplication  : Started DbTestApplication in 3.252 seconds (JVM running for 3.632) 
2017-06-24 23:58:08.381 INFO 4842 --- [  Thread-3] s.c.a.AnnotationConfigApplicationContext : Closing org.springframework.context.annotation.AnnotationConfigApplicationContext@2f490758: startup date [Sat Jun 24 23:58:05 CEST 2017]; root of context hierarchy 
2017-06-24 23:58:08.382 INFO 4842 --- [  Thread-3] o.s.j.e.a.AnnotationMBeanExporter  : Unregistering JMX-exposed beans on shutdown 
2017-06-24 23:58:08.383 INFO 4842 --- [  Thread-3] j.LocalContainerEntityManagerFactoryBean : Closing JPA EntityManagerFactory for persistence unit 'default' 
2017-06-24 23:58:08.383 INFO 4842 --- [  Thread-3] org.hibernate.tool.hbm2ddl.SchemaExport : HHH000227: Running hbm2ddl schema export 
2017-06-24 23:58:08.386 INFO 4842 --- [  Thread-3] org.hibernate.tool.hbm2ddl.SchemaExport : HHH000230: Schema export complete 

的pom.xml

<dependency> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter</artifactId> 
</dependency> 

<dependency> 
    <groupId>org.springframework.boot</groupId> 
    <artifactId>spring-boot-starter-data-jpa</artifactId> 
</dependency> 

<dependency> 
    <groupId>org.postgresql</groupId> 
    <artifactId>postgresql</artifactId> 
    <version>9.4-1201-jdbc41</version> 
    <scope>compile</scope> 
</dependency> 

<dependency> 
    <groupId>org.hibernate</groupId> 
    <artifactId>hibernate-core</artifactId> 
</dependency> 

<dependency> 
    <groupId>org.hibernate</groupId> 
    <artifactId>hibernate-entitymanager</artifactId> 
</dependency> 

<dependency> 
    <groupId>org.hibernate.javax.persistence</groupId> 
    <artifactId>hibernate-jpa-2.1-api</artifactId> 
    <version>1.0.0.Final</version> 
</dependency> 

這是最簡單的程序，我試圖用註釋創建一個表。最後，在數據庫中沒有創建表。任何人都可以幫助我？這對我來說似乎是一切。

Answer 1

我發現我錯了。
Question實體處於package org.java.domain
DbTestApplication是package org.java.dbtest

爲彈簧引導，它們必須是在同一個包或子包。

Answer 2

好像你需要啓用EntityScan春季找到你的模型類：

@SpringBootApplication 
@EntityScan // <-- find all classes annotated with @Entity 
public class DbTestApplication { 

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