使用 OpenJPA 和 postgresql 简单创建数据库
simple creation of DB with OpenJPA and postgresql
我认为我的 TomEE 版本有一些问题，但一旦它运行良好....
当我尝试创建数据库时出现问题...
这是堆栈：
objc[1068]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/bin/java and /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined.
424 unisocial-database INFO [main] openjpa.Runtime - OpenJPA dynamically loaded the class enhancer. Any classes that were not enhanced at build time will be enhanced when they are loaded by the JVM.
522 unisocial-database INFO [main] openjpa.Runtime - OpenJPA dynamically loaded a validation provider.
537 unisocial-database INFO [main] openjpa.Runtime - Starting OpenJPA 2.4.0-nonfinal-1598334
Exception in thread "main" <openjpa-2.4.0-nonfinal-1598334-r422266:1599166
fatal user error> org.apache.openjpa.persistence.ArgumentException:
The persistence provider is attempting to use properties
in the persistence.xml file to resolve the data source.
A Java Database Connectivity (JDBC) driver or data source class
name must be specified in the openjpa.ConnectionDriverName or
javax.persistence.jdbc.driver property. The following properties
are available in the configuration:
"org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl@80992065".
at org.apache.openjpa.jdbc.schema.DataSourceFactory.newDataSource(DataSourceFactory.java:72)
at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.createConnectionFactory(JDBCConfigurationImpl.java:849)
at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getDBDictionaryInstance(JDBCConfigurationImpl.java:602)
at org.apache.openjpa.jdbc.meta.MappingRepository.endConfiguration(MappingRepository.java:1518)
at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:535)
at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:460)
at org.apache.openjpa.lib.conf.PluginValue.instantiate(PluginValue.java:121)
at org.apache.openjpa.conf.MetaDataRepositoryValue.instantiate(MetaDataRepositoryValue.java:68)
at org.apache.openjpa.lib.conf.ObjectValue.instantiate(ObjectValue.java:83)
at org.apache.openjpa.conf.OpenJPAConfigurationImpl.newMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:967)
at org.apache.openjpa.conf.OpenJPAConfigurationImpl.getMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:958)
at org.apache.openjpa.kernel.AbstractBrokerFactory.makeReadOnly(AbstractBrokerFactory.java:642)
at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:202)
at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:155)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:226)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:153)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:59)
at eu.algoritmi.unisocial.model.MainP.main(MainP.java:14)
这是我的 persistence.xml:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="unisocial-database"
transaction-type="JTA">
<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
<jta-data-source>unisocial database</jta-data-source>
<class>eu.algoritmi.unisocial.model.UtenteNonGiuridico</class>
<class>eu.algoritmi.unisocial.model.Corso</class>
<class>eu.algoritmi.unisocial.model.Facolta</class>
<class>eu.algoritmi.unisocial.model.Universita</class>
<class>eu.algoritmi.unisocial.model.Studente</class>
<class>eu.algoritmi.unisocial.model.UtenteNonGiuridico</class>
<properties>
<property name="openjpa.jdbc.SynchronizeMappings"
value="buildSchema(SchemaAction=add,ForeignKeys=true)" />
<property name="openjpa.Log"
value="DefaultLevel=WARN, Runtime=INFO, Tool=INFO, SQL=TRACE" />
<property name="openjpa.jdbc.MappingDefaults"
value="ForeignKeyDeleteAction=restrict,JoinForeignKeyDeleteAction=restrict" />
<property name="openjpa.RuntimeUnenhancedClasses" value="supported" />
<property name="javax.persistence.schema-generation.database.action"
value="drop-and-create" />
<property
name="javax.persistence.schema-generation.create-database-schemas"
value="true" />
</properties>
</persistence-unit>
</persistence>
这是resouces.xml
<tomee>
<Resource id="unisocial database" type="DataSource">
JdbcDriver org.postgresql.Driver
JdbcUrl jdbc:postgresql://localhost/unisocial
UserName unisocial
Password unisocial
JtaManaged true
DefaultAutoCommit false
</Resource>
</tomee>
这是主要用来演示效果的class。
package eu.algoritmi.unisocial.model;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
public class MainP {
public static void main(String[] args) {
EntityManagerFactory emf = Persistence.createEntityManagerFactory("unisocial-database");
EntityManager em = emf.createEntityManager();
Universita u=new Universita("romaTre", null);
EntityTransaction tx = em.getTransaction();
tx.begin();
em.persist(u);
tx.commit();
em.close();
emf.close();
}
}
问题与堆栈跟踪中的这条消息有关：
A Java Database Connectivity (JDBC) driver or data source class
name must be specified in the openjpa.ConnectionDriverName or
javax.persistence.jdbc.driver property.
检查您提供的 persistence.xml我们可以看到，您忘记提供这两个属性之一。两者之一是强制性的，因此您的 TomEE 环境可以确定在连接到 PostgreSQL 后端时使用哪个 JDBC 驱动程序。 persistence.xml配置如下应该可以解决您的问题：
<persistence version="2.0"
xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="unisocial-database"
transaction-type="JTA">
<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
<jta-data-source>unisocial database</jta-data-source>
<class>eu.algoritmi.unisocial.model.UtenteNonGiuridico</class>
<class>eu.algoritmi.unisocial.model.Corso</class>
<class>eu.algoritmi.unisocial.model.Facolta</class>
<class>eu.algoritmi.unisocial.model.Universita</class>
<class>eu.algoritmi.unisocial.model.Studente</class>
<class>eu.algoritmi.unisocial.model.UtenteNonGiuridico</class>
<properties>
<!-- Generic JPA configuration attributes -->
<property name="javax.persistence.jdbc.driver"
value="org.postgresql.Driver" />
<property name="javax.persistence.schema-generation.database.action"
value="drop-and-create" />
<property name="javax.persistence.schema-generation.create-database-schemas"
value="true" />
<!-- OpenJPA specific configuration attributes -->
<property name="openjpa.jdbc.SynchronizeMappings"
value="buildSchema(SchemaAction=add,ForeignKeys=true)" />
<property name="openjpa.Log"
value="DefaultLevel=WARN, Runtime=INFO, Tool=INFO, SQL=TRACE" />
<property name="openjpa.jdbc.MappingDefaults"
value="ForeignKeyDeleteAction=restrict,JoinForeignKeyDeleteAction=restrict" />
<property name="openjpa.RuntimeUnenhancedClasses" value="supported" />
</properties>
</persistence-unit>
</persistence>
记得将 PostgreSQL 驱动程序的最新 JAR 文件复制到 TomEE 安装的 lib 目录中。这样，驱动程序将在您的容器中部署的不同 Web 应用程序中找到。
希望对您有所帮助。
我认为我的 TomEE 版本有一些问题，但一旦它运行良好.... 当我尝试创建数据库时出现问题... 这是堆栈：
objc[1068]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/bin/java and /Library/Java/JavaVirtualMachines/jdk1.8.0_45.jdk/Contents/Home/jre/lib/libinstrument.dylib. One of the two will be used. Which one is undefined.
424 unisocial-database INFO [main] openjpa.Runtime - OpenJPA dynamically loaded the class enhancer. Any classes that were not enhanced at build time will be enhanced when they are loaded by the JVM.
522 unisocial-database INFO [main] openjpa.Runtime - OpenJPA dynamically loaded a validation provider.
537 unisocial-database INFO [main] openjpa.Runtime - Starting OpenJPA 2.4.0-nonfinal-1598334
Exception in thread "main" <openjpa-2.4.0-nonfinal-1598334-r422266:1599166
fatal user error> org.apache.openjpa.persistence.ArgumentException:
The persistence provider is attempting to use properties
in the persistence.xml file to resolve the data source.
A Java Database Connectivity (JDBC) driver or data source class
name must be specified in the openjpa.ConnectionDriverName or
javax.persistence.jdbc.driver property. The following properties
are available in the configuration:
"org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl@80992065".
at org.apache.openjpa.jdbc.schema.DataSourceFactory.newDataSource(DataSourceFactory.java:72)
at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.createConnectionFactory(JDBCConfigurationImpl.java:849)
at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getDBDictionaryInstance(JDBCConfigurationImpl.java:602)
at org.apache.openjpa.jdbc.meta.MappingRepository.endConfiguration(MappingRepository.java:1518)
at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:535)
at org.apache.openjpa.lib.conf.Configurations.configureInstance(Configurations.java:460)
at org.apache.openjpa.lib.conf.PluginValue.instantiate(PluginValue.java:121)
at org.apache.openjpa.conf.MetaDataRepositoryValue.instantiate(MetaDataRepositoryValue.java:68)
at org.apache.openjpa.lib.conf.ObjectValue.instantiate(ObjectValue.java:83)
at org.apache.openjpa.conf.OpenJPAConfigurationImpl.newMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:967)
at org.apache.openjpa.conf.OpenJPAConfigurationImpl.getMetaDataRepositoryInstance(OpenJPAConfigurationImpl.java:958)
at org.apache.openjpa.kernel.AbstractBrokerFactory.makeReadOnly(AbstractBrokerFactory.java:642)
at org.apache.openjpa.kernel.AbstractBrokerFactory.newBroker(AbstractBrokerFactory.java:202)
at org.apache.openjpa.kernel.DelegatingBrokerFactory.newBroker(DelegatingBrokerFactory.java:155)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:226)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:153)
at org.apache.openjpa.persistence.EntityManagerFactoryImpl.createEntityManager(EntityManagerFactoryImpl.java:59)
at eu.algoritmi.unisocial.model.MainP.main(MainP.java:14)
这是我的 persistence.xml:
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0"
xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="unisocial-database"
transaction-type="JTA">
<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
<jta-data-source>unisocial database</jta-data-source>
<class>eu.algoritmi.unisocial.model.UtenteNonGiuridico</class>
<class>eu.algoritmi.unisocial.model.Corso</class>
<class>eu.algoritmi.unisocial.model.Facolta</class>
<class>eu.algoritmi.unisocial.model.Universita</class>
<class>eu.algoritmi.unisocial.model.Studente</class>
<class>eu.algoritmi.unisocial.model.UtenteNonGiuridico</class>
<properties>
<property name="openjpa.jdbc.SynchronizeMappings"
value="buildSchema(SchemaAction=add,ForeignKeys=true)" />
<property name="openjpa.Log"
value="DefaultLevel=WARN, Runtime=INFO, Tool=INFO, SQL=TRACE" />
<property name="openjpa.jdbc.MappingDefaults"
value="ForeignKeyDeleteAction=restrict,JoinForeignKeyDeleteAction=restrict" />
<property name="openjpa.RuntimeUnenhancedClasses" value="supported" />
<property name="javax.persistence.schema-generation.database.action"
value="drop-and-create" />
<property
name="javax.persistence.schema-generation.create-database-schemas"
value="true" />
</properties>
</persistence-unit>
</persistence>
这是resouces.xml
<tomee>
<Resource id="unisocial database" type="DataSource">
JdbcDriver org.postgresql.Driver
JdbcUrl jdbc:postgresql://localhost/unisocial
UserName unisocial
Password unisocial
JtaManaged true
DefaultAutoCommit false
</Resource>
</tomee>
这是主要用来演示效果的class。
package eu.algoritmi.unisocial.model;
import javax.persistence.EntityManager;
import javax.persistence.EntityManagerFactory;
import javax.persistence.EntityTransaction;
import javax.persistence.Persistence;
public class MainP {
public static void main(String[] args) {
EntityManagerFactory emf = Persistence.createEntityManagerFactory("unisocial-database");
EntityManager em = emf.createEntityManager();
Universita u=new Universita("romaTre", null);
EntityTransaction tx = em.getTransaction();
tx.begin();
em.persist(u);
tx.commit();
em.close();
emf.close();
}
}
问题与堆栈跟踪中的这条消息有关：
A Java Database Connectivity (JDBC) driver or data source class name must be specified in the
openjpa.ConnectionDriverNameorjavax.persistence.jdbc.driverproperty.
检查您提供的 persistence.xml我们可以看到，您忘记提供这两个属性之一。两者之一是强制性的，因此您的 TomEE 环境可以确定在连接到 PostgreSQL 后端时使用哪个 JDBC 驱动程序。 persistence.xml配置如下应该可以解决您的问题：
<persistence version="2.0"
xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="unisocial-database"
transaction-type="JTA">
<provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
<jta-data-source>unisocial database</jta-data-source>
<class>eu.algoritmi.unisocial.model.UtenteNonGiuridico</class>
<class>eu.algoritmi.unisocial.model.Corso</class>
<class>eu.algoritmi.unisocial.model.Facolta</class>
<class>eu.algoritmi.unisocial.model.Universita</class>
<class>eu.algoritmi.unisocial.model.Studente</class>
<class>eu.algoritmi.unisocial.model.UtenteNonGiuridico</class>
<properties>
<!-- Generic JPA configuration attributes -->
<property name="javax.persistence.jdbc.driver"
value="org.postgresql.Driver" />
<property name="javax.persistence.schema-generation.database.action"
value="drop-and-create" />
<property name="javax.persistence.schema-generation.create-database-schemas"
value="true" />
<!-- OpenJPA specific configuration attributes -->
<property name="openjpa.jdbc.SynchronizeMappings"
value="buildSchema(SchemaAction=add,ForeignKeys=true)" />
<property name="openjpa.Log"
value="DefaultLevel=WARN, Runtime=INFO, Tool=INFO, SQL=TRACE" />
<property name="openjpa.jdbc.MappingDefaults"
value="ForeignKeyDeleteAction=restrict,JoinForeignKeyDeleteAction=restrict" />
<property name="openjpa.RuntimeUnenhancedClasses" value="supported" />
</properties>
</persistence-unit>
</persistence>
记得将 PostgreSQL 驱动程序的最新 JAR 文件复制到 TomEE 安装的 lib 目录中。这样，驱动程序将在您的容器中部署的不同 Web 应用程序中找到。
希望对您有所帮助。