（请注意：在调查时这个问题 https://stackoverflow.com/questions/52799706/springboot-not-an-entity?noredirect=1#comment92527948_52799706我更好地找到了我在这里介绍的问题根源）
我对 Hibernate 和 SpringBoot 非常陌生。我的项目涉及一个搜索引擎，其中索引（javafx 客户端）和搜索（Web 客户端）部分是分开的。 Web客户端使用SpringBoot，在用户请求的过程中，我需要检索Solr索引上的信息以进行搜索。这些信息存储在 Hibernate/H2 本地数据库中，我在其中使用以下实体类：
@Entity
@Table(name = "IndexSetups")
@Access(AccessType.PROPERTY)
public class IndexSetup {
private final SimpleIntegerProperty id = new SimpleIntegerProperty();
@Id
@GeneratedValue(strategy = GenerationType.AUTO) // For H2 AUTO is required to auto increment the id
public int getId() {
return id.get();
}
//... other properties, getters and setters
}
LocalDatabase 类具有一种列出数据库中所有 IndexSetups 的方法（还有其他方法，但关注这个方法就足以理解问题）。我需要在控制器中调用它，但我得到了“不是实体：类 IndexSetup” https://stackoverflow.com/questions/52799706/springboot-not-an-entity?noredirect=1#comment92527948_52799706.
然而，使用我的实体的唯一方法是阻止启动 Spring Boot（注释以 SpringApplication.run(...) 开头的行）：
@SpringBootApplication
public class ServerApplication {
public static void main(String[] args) {
// SpringApplication.run(ServerApplication.class, args);
ArrayList<IndexSetup> availableSearchIndex =
LocalDatabase.getInstance(false) // no GUI
.getAllIndexSetups();
// The list is displayed as long as SpringApplication.run() call is commented. Otherwise "Not an entity"
System.err.println("The Index setups are " + availableSearchIndex);
}
}
当然，这不是一个解决方案，因为我确实需要通过 Spring Boot 处理用户的请求:-D！
最后 hibernate.cfg.xml 文件内容如下：
<hibernate-configuration>
<session-factory>
<!-- Database connection settings -->
<property name="connection.driver_class">org.h2.Driver</property>
<!--The db file resides wihtin the parent project (so one level above the calling project see ../)-->
<!--We use the auto server mode to be able to open the database from server and from indexer simultaneously
see http://www.h2database.com/html/features.html#auto_mixed_mode -->
<property name="connection.url">jdbc:h2:file:../MyAppDB;DB_CLOSE_ON_EXIT=TRUE;AUTO_SERVER=TRUE</property>
<property name="connection.username">test</property>
<property name="connection.password"/>
<!-- JDBC connection pool (use the built-in) -->
<property name="connection.pool_size">1</property>
<!-- SQL dialect -->
<property name="dialect">org.hibernate.dialect.H2Dialect</property>
<!-- Disable the second-level cache -->
<property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>
<!-- Echo all executed SQL to stdout -->
<property name="show_sql">false</property>
<!-- Updates the existing database schema on startup -->
<property name="hbm2ddl.auto">update</property>
<!-- The mapping information of entities -->
<mapping class="my.package.Entities.IndexSetup"/>
</session-factory>
</hibernate-configuration>
堆栈跟踪是：
Exception in thread "restartedMain" java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:498)
at org.springframework.boot.devtools.restart.RestartLauncher.run(RestartLauncher.java:49)
Caused by: java.lang.IllegalArgumentException: Not an entity: class my.package.Entities.IndexSetup
at org.hibernate.metamodel.internal.MetamodelImpl.entity(MetamodelImpl.java:457)
at org.hibernate.query.criteria.internal.QueryStructure.from(QueryStructure.java:126)
at org.hibernate.query.criteria.internal.CriteriaQueryImpl.from(CriteriaQueryImpl.java:153)
at my.package.LocalDatabase.getAllIndexSetups(LocalDatabase.java:99)
at my.package.ServerApplication.main(ServerApplication.java:15)
我刚刚注意到 Spring Boot 在启动时打印的这两行：
2018-10-15 11:47:46.208 INFO 27730 --- [ restartedMain] org.hibernate.cfg.Environment : HHH000206: hibernate.properties not found // Maybe this one is not just "INFO"
2018-10-15 11:47:46.591 WARN 27730 --- [ restartedMain] org.hibernate.orm.connections.pooling : HHH10001002: Using Hibernate built-in connection pool (not for production use!)
2018-10-15 11:47:46.594 INFO 27730 --- [ restartedMain] org.hibernate.orm.connections.pooling : HHH10001005: using driver [org.h2.Driver] at URL [jdbc:h2:file:../MyAppDB;DB_CLOSE_ON_EXIT=TRUE;FILE_LOCK=NO] // Just to show that my bibernate.cfg.xml is found
它看起来不太可能是依赖问题，因为它仅在 Spring 应用程序运行时停止工作。
所以我的问题是：我应该怎么做才能让我的实体在 SpringBoot 中工作？
非常感谢任何帮助！
