EclipseLink提供全面的开源Java持久性解决方案。 EclipseLink专注于标准（JPA，JAXB，SDO），它们具有针对跨数据源，格式和容器的企业软件开发人员的高级功能，性能和可伸缩性。
我正在使用JPA 2.0的EclipseLink实现，该实现允许悲观锁定。我知道如何锁定实体，但是如何释放锁定？起初我以为这一切都是照顾好...
我们在JavaEE7应用程序中将Eclipselink-2.6与wildfly-8服务器一起使用。我们有三个JPA实体A，B和C。B和C扩展了A。为了将对象“ myObjectId” A的类型更改为B，我们...
我有一个带有一些外键的数据库，这些外键没有配置为ON DELETE CASCADE；如果可能，我想避免更改此设置。同样，我们的JPA关系也未配置cascade = ...
我在MySQL中创建了一个存储过程，并使用JPA EclipseLink从Java应用程序中对其进行了调用。调用该过程后，它内部就有一个“ sleep（sec）”方法，然后它执行某些操作...
Spring Boot在2.0.9和2.1.0之间，使用eclipselink ddl自动生成问题
使用Spring boot 2.1.0 RELEASE创建的新项目，我的pom.xml包含此内容。 [ 我发现了问题。从Spring Boot 2.1.0.RELEASE开始，只有在我们击中任何REST Controller端点之后，Eclipselink的持久性单元才会部署。因此，在应用程序准备就绪后，我更改了代码以对其进行初始化。这是一种怪诞的方式，但是可行。 public class JPAConfig implements ApplicationContextAware { // ... private ApplicationContext context; @Override public void setApplicationContext(ApplicationContext applicationContext) throws BeansException { this.context = applicationContext; } @EventListener(ApplicationReadyEvent.class) public void startup() { EntityManager bean = this.context.getBean(EntityManager.class); try { bean.clear(); }catch (Exception e){ e.printStackTrace(); } } //... } 运行此命令后，我得到这样的日志： EL Finest]: jpa: 2019-12-27 17:49:05.083--ServerSession(1197389053)--Thread(Thread[main,5,main])--Begin deploying Persistence Unit xxxx-pu; session /file:/home/user/NetBeansProjects/xxxx-api/target/classes/_xxxx-pu; state Predeployed; factoryCount 1 [EL Finer]: server: 2019-12-27 17:49:05.11--Thread(Thread[main,5,main])--Detected server platform: org.eclipse.persistence.platform.server.NoServerPlatform. [EL Finer]: 2019-12-27 17:49:05.111--Thread(Thread[main,5,main])--initializing session manager [EL Finer]: server: 2019-12-27 17:49:05.112--ServerSession(1197389053)--Thread(Thread[main,5,main])--Detected server platform: org.eclipse.persistence.platform.server.NoServerPlatform. [EL Finest]: properties: 2019-12-27 17:49:05.113--ServerSession(1197389053)--Thread(Thread[main,5,main])--property=eclipselink.logging.level; value=ALL [EL Finest]: properties: 2019-12-27 17:49:05.113--ServerSession(1197389053)--Thread(Thread[main,5,main])--property=eclipselink.logging.level; value=ALL [EL Finest]: properties: 2019-12-27 17:49:05.116--ServerSession(1197389053)--Thread(Thread[main,5,main])--property=eclipselink.cache.query-results; value=false [EL Finest]: properties: 2019-12-27 17:49:05.117--ServerSession(1197389053)--Thread(Thread[main,5,main])--property=eclipselink.cache.shared.default; value=false [EL Finest]: properties: 2019-12-27 17:49:05.117--ServerSession(1197389053)--Thread(Thread[main,5,main])--property=eclipselink.jdbc.batch-writing; value=JDBC [EL Finest]: properties: 2019-12-27 17:49:05.118--ServerSession(1197389053)--Thread(Thread[main,5,main])--property=eclipselink.session.customizer; value=com.xxxx.api.config.CamelCaseSessionCustomizer [EL Info]: 2019-12-27 17:49:05.12--ServerSession(1197389053)--Thread(Thread[main,5,main])--EclipseLink, version: Eclipse Persistence Services - 2.6.3.v20160428-59c81c5 [EL Finest]: connection: 2019-12-27 17:49:05.164--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.oracle.Oracle12Platform, regular expression: (?is)oracle.*12.* [EL Finest]: connection: 2019-12-27 17:49:05.164--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.oracle.Oracle11Platform, regular expression: (?is)oracle.*11.* [EL Finest]: connection: 2019-12-27 17:49:05.164--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.oracle.Oracle10Platform, regular expression: (?is)oracle.*10.* [EL Finest]: connection: 2019-12-27 17:49:05.165--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.oracle.Oracle9Platform, regular expression: (?is)oracle.*9.* [EL Finest]: connection: 2019-12-27 17:49:05.165--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.oracle.OraclePlatform, regular expression: (?is)oracle.* [EL Finest]: connection: 2019-12-27 17:49:05.165--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.SQLAnywherePlatform, regular expression: SQL\ Anywhere.* [EL Finest]: connection: 2019-12-27 17:49:05.165--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.SybasePlatform, regular expression: (?i)(sybase.*)|(adaptive\ server\ enterprise.*)|(SQL\ Server.*) [EL Finest]: connection: 2019-12-27 17:49:05.165--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.SQLServerPlatform, regular expression: (?i)microsoft.* [EL Finest]: connection: 2019-12-27 17:49:05.165--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.JavaDBPlatform, regular expression: (?i).*derby.* [EL Finest]: connection: 2019-12-27 17:49:05.166--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.DB2ZPlatform, regular expression: (?i).*db2.*dsn.* [EL Finest]: connection: 2019-12-27 17:49:05.166--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.DB2MainframePlatform, regular expression: (?i).*db2.*qsq.* [EL Finest]: connection: 2019-12-27 17:49:05.166--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.DB2Platform, regular expression: (?i).*db2.* [EL Finest]: connection: 2019-12-27 17:49:05.166--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.PointBasePlatform, regular expression: (?is)pointbase.* [EL Finest]: connection: 2019-12-27 17:49:05.166--Thread(Thread[main,5,main])--Database platform: org.eclipse.persistence.platform.database.MySQLPlatform, regular expression: (?i)mysql.* [EL Fine]: connection: 2019-12-27 17:49:05.167--Thread(Thread[main,5,main])--Detected database platform: org.eclipse.persistence.platform.database.MySQLPlatform [EL Config]: connection: 2019-12-27 17:49:05.222--ServerSession(1197389053)--Connection(595285180)--Thread(Thread[main,5,main])--connecting(DatabaseLogin( platform=>MySQLPlatform user name=> "" connector=>JNDIConnector datasource name=>null )) [EL Config]: connection: 2019-12-27 17:49:05.247--ServerSession(1197389053)--Connection(156850393)--Thread(Thread[main,5,main])--Connected: jdbc:mysql://localhost:3306/xxxx?nullNamePatternMatchesAll=true&useUnicode=true&character_set_server=utf8mb4&useLegacyDatetimeCode=false&useTimezone=true&serverTimezone=GMT User: root@localhost Database: MySQL Version: 5.7.28-0ubuntu0.18.04.4 Driver: MySQL Connector/J Version: mysql-connector-java-8.0.17 (Revision: 16a712ddb3f826a1933ab42b0039f7fb9eebc6ec) [EL Finest]: connection: 2019-12-27 17:49:05.248--ServerSession(1197389053)--Connection(1895707642)--Thread(Thread[main,5,main])--Connection acquired from connection pool [read]. [EL Finest]: connection: 2019-12-27 17:49:05.249--ServerSession(1197389053)--Connection(1895707642)--Thread(Thread[main,5,main])--Connection released to connection pool [read]. [EL Config]: connection: 2019-12-27 17:49:05.249--ServerSession(1197389053)--Connection(1039835620)--Thread(Thread[main,5,main])--connecting(DatabaseLogin( platform=>MySQLPlatform user name=> "" connector=>JNDIConnector datasource name=>null )) [EL Config]: connection: 2019-12-27 17:49:05.27--ServerSession(1197389053)--Connection(1160393458)--Thread(Thread[main,5,main])--Connected: jdbc:mysql://localhost:3306/xxxx?nullNamePatternMatchesAll=true&useUnicode=true&character_set_server=utf8mb4&useLegacyDatetimeCode=false&useTimezone=true&serverTimezone=GMT User: root@localhost Database: MySQL Version: 5.7.28-0ubuntu0.18.04.4 Driver: MySQL Connector/J Version: mysql-connector-java-8.0.17 (Revision: 16a712ddb3f826a1933ab42b0039f7fb9eebc6ec) [EL Finest]: sequencing: 2019-12-27 17:49:05.292--ServerSession(1197389053)--Thread(Thread[main,5,main])--sequencing connected, state is Preallocation_Transaction_NoAccessor_State [EL Finest]: sequencing: 2019-12-27 17:49:05.292--ServerSession(1197389053)--Thread(Thread[main,5,main])--sequence SEQUENCE: preallocation size 50 [EL Finest]: sequencing: 2019-12-27 17:49:05.293--ServerSession(1197389053)--Thread(Thread[main,5,main])--sequence SEQ_GEN: preallocation size 50 [EL Info]: connection: 2019-12-27 17:49:05.32--ServerSession(1197389053)--Thread(Thread[main,5,main])--/file:/home/user/NetBeansProjects/xxxx-api/target/classes/_xxxx-pu login successful [EL Finest]: query: 2019-12-27 17:49:05.385--ServerSession(1197389053)--Thread(Thread[main,5,main])--Execute query DataModifyQuery(sql="CREATE TABLE ACCOUNT (ID BIGINT NOT NULL, PASSWD VARCHAR(255), USR VARCHAR(255), PRIMARY KEY (ID))") [EL Finest]: connection: 2019-12-27 17:49:05.385--ServerSession(1197389053)--Connection(6267871)--Thread(Thread[main,5,main])--Connection acquired from connection pool [read]. [EL Finest]: connection: 2019-12-27 17:49:05.385--ServerSession(1197389053)--Thread(Thread[main,5,main])--reconnecting to external connection pool [EL Fine]: sql: 2019-12-27 17:49:05.402--ServerSession(1197389053)--Connection(991572261)--Thread(Thread[main,5,main])--CREATE TABLE ACCOUNT (ID BIGINT NOT NULL, PASSWD VARCHAR(255), USR VARCHAR(255), PRIMARY KEY (ID)) [EL Finest]: connection: 2019-12-27 17:49:05.891--ServerSession(1197389053)--Connection(6267871)--Thread(Thread[main,5,main])--Connection released to connection pool [read]. [EL Finest]: ddl: 2019-12-27 17:49:05.891--Thread(Thread[main,5,main])--The table (ACCOUNT) is created. [EL Finest]: query: 2019-12-27 17:49:05.91--ServerSession(1197389053)--Thread(Thread[main,5,main])--Execute query DataReadQuery(sql="SELECT * FROM SEQUENCE WHERE SEQ_NAME = 'SEQ_GEN'") [EL Finest]: connection: 2019-12-27 17:49:05.911--ServerSession(1197389053)--Connection(966446307)--Thread(Thread[main,5,main])--Connection acquired from connection pool [read]. [EL Finest]: connection: 2019-12-27 17:49:05.911--ServerSession(1197389053)--Thread(Thread[main,5,main])--reconnecting to external connection pool [EL Fine]: sql: 2019-12-27 17:49:05.925--ServerSession(1197389053)--Connection(34004511)--Thread(Thread[main,5,main])--SELECT * FROM SEQUENCE WHERE SEQ_NAME = 'SEQ_GEN' [EL Finest]: connection: 2019-12-27 17:49:05.928--ServerSession(1197389053)--Connection(966446307)--Thread(Thread[main,5,main])--Connection released to connection pool [read]. [EL Finer]: metamodel: 2019-12-27 17:49:05.929--ServerSession(1197389053)--Thread(Thread[main,5,main])--Canonical Metamodel class [com.xxxx.api.model.Account_] not found during initialization. [EL Finer]: metamodel: 2019-12-27 17:49:05.93--ServerSession(1197389053)--Thread(Thread[main,5,main])--Canonical Metamodel class [com.xxxx.api.model.BaseModel_] not found during initialization. [EL Finest]: jpa: 2019-12-27 17:49:05.93--ServerSession(1197389053)--Thread(Thread[main,5,main])--End deploying Persistence Unit xxxx-pu; session /file:/home/user/NetBeansProjects/xxxx-api/target/classes/_xxxx-pu; state Deployed; factoryCount 1 我也在2.1.0.RELEASE和最新的2.2.2.RELEASE上都尝试过，效果很好。
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