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我們有一個Spring應用程序，通過@Autowire和其他方式連接到MongoDB時沒有問題。「IllegalArgumentException：至少有一個JPA元模型必須存在」 - 嘗試將應用程序連接到mongo和sql時
現在我們還需要應用程序將也連接到SQL數據庫。
所以我們裝箱的@Entity類：
@Entity(name = "SqlCarRecord")
@Table(name = "Cars")
final public class SqlCarRecord {
@Id @GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@Column(name = "name", nullable = false)
private String name;
....
而一個@Repository接口：
@Repository
public interface SqlCarsRepository extends JpaRepository<SqlCarRecord, Long> {
...
而一個@Configuraion類喜歡這裏的例子https://www.petrikainulainen.net/programming/spring-framework/spring-data-jpa-tutorial-part-one-configuration/
而在th Ë的applicationContext我們增加 <jpa:repositories base-package="path.to.interface.package" />
在pom.xml中我們已經有
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-beans</artifactId>
<version>4.3.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-context</artifactId>
<version>4.3.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-core</artifactId>
<version>4.3.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-expression</artifactId>
<version>4.3.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-web</artifactId>
<version>4.3.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework</groupId>
<artifactId>spring-webmvc</artifactId>
<version>4.3.5.RELEASE</version>
</dependency>
和我們說：
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-data-jpa</artifactId>
<version>2.0.0.M3</version>
</dependency>
<dependency>
<groupId>org.eclipse.persistence</groupId>
<artifactId>javax.persistence</artifactId>
<version>2.1.0</version>
</dependency>
<!-- DataSource (HikariCP) -->
<dependency>
<groupId>com.zaxxer</groupId>
<artifactId>HikariCP</artifactId>
<version>2.6.2</version>
</dependency>
<!-- JPA Provider (Hibernate) -->
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-entitymanager</artifactId>
<version>5.2.10.Final</version>
</dependency>
<!-- Spring Data JPA -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-jpa</artifactId>
<version>1.11.6.RELEASE</version>
</dependency>
<!-- adding this to avoid "java.lang.NoClassDefFoundError: org/w3c/dom/ElementTraversal" -->
<dependency>
<groupId>xml-apis</groupId>
<artifactId>xml-apis</artifactId>
<version>1.4.01</version>
</dependency>
<!-- adding this to avoid "ClassNotFoundException: org.springframework.data.util.CloseableIterator" -->
<dependency>
<groupId>org.springframework.data</groupId>
<artifactId>spring-data-commons</artifactId>
<version>1.13.6.RELEASE</version>
</dependency>
而在@Service類，我們增加：
....
@Autowired
private SqlCarsRepository carsRepository;
項目順利建成，可是當我們嘗試運行它，我們得到這個錯誤：
Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean
with name 'jpaMappingContext': Invocation of init method failed; nested
exception is java.lang.IllegalArgumentException: At least one JPA metamodel
must be present!
有些事情我們嘗試：
- 變化在不同版本的春天聚甲醛，
- 我們試圖評論他們中的一些，
- 我們試圖改變接口來擴展CrudRepository
- 嘗試一個空的構造添加到實體和一些其他的東西
沒有運氣。
會appriciate幫助。
在此先感謝。
@SpringBootApplication(exclude = {JndiConnectionFactoryAutoConfiguration.class,DataSourceAutoConfiguration.class,
HibernateJpaAutoConfiguration.class,JpaRepositoriesAutoConfiguration.class,DataSourceTransactionManagerAutoConfiguration.class})
如果您是直接使用@EnableAutoConfiguration，試試這個：