Question

我正在Wildfly 15.0.1上运行Java EE应用程序。我试图使用JPA而不在Wildfly上创建数据源，因为我希望所有依赖项都打包在应用程序源代码中。我正在使用Maven构建WAR。

我正在使用PostgreSQL，并且它已在http://localhost:5432上启动并运行，我为此项目创建了一个名为test的数据库。

因此，我将此依赖项添加到了pom.xml：

<dependency>
        <groupId>org.postgresql</groupId>
        <artifactId>postgresql</artifactId>
        <version>42.2.5</version>
    </dependency>

我的persistence.xml位于src/main/resources/META-INF/persistence.xml中：

<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" version="2.2"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_2.xsd">
<persistence-unit name="pu1">
    <!-- classes -->
    <class>myapp.model.Address</class>
    <class>myapp.model.Transaction</class>
    <properties>
        <!-- database connection -->
        <property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver" />
        <property name="javax.persistence.jdbc.url" value="jdbc:postgresql://localhost:5432/testing" />
        <property name="javax.persistence.jdbc.user" value="postgres" />
        <property name="javax.persistence.jdbc.password" value="postgres" />

        <!-- hibernate -->
        <property name="hibernate.hbm2ddl.auto" value="create"/>
    </properties>
</persistence-unit>

我的Address和Transaction类上都有 @Entity 批注。但是，什么都没有发生。这是日志片段：

22:58:05,759 INFO  [org.hibernate.jpa.internal.util.LogHelper] (ServerService Thread Pool -- 103) HHH000204: Processing PersistenceUnitInfo [
    name: pu1
    ...]
22:58:05,760 INFO  [org.jboss.weld.deployer] (MSC service thread 1-5) WFLYWELD0003: Processing weld deployment myapp.backend-1.0.war
22:58:05,791 WARN  [org.jboss.as.jaxrs] (MSC service thread 1-3) WFLYRS0018: Explicit usage of Jackson annotation in a JAX-RS deployment; the system will disable JSON-B processing for the current deployment. Consider setting the 'resteasy.preferJacksonOverJsonB' property to 'false' to restore JSON-B.
22:58:05,796 INFO  [org.jboss.as.connector.deployers.jdbc] (MSC service thread 1-3) WFLYJCA0005: Deploying non-JDBC-compliant driver class org.postgresql.Driver (version 42.2)
22:58:05,810 INFO  [org.jboss.as.connector.deployers.jdbc] (MSC service thread 1-8) WFLYJCA0018: Started Driver service with driver-name = myapp.backend-1.0.war_org.postgresql.Driver_42_2
22:58:05,816 INFO  [org.jboss.as.jpa] (ServerService Thread Pool -- 103) WFLYJPA0010: Starting Persistence Unit (phase 2 of 2) Service 'myapp.backend-1.0.war#pu1'
22:58:05,817 INFO  [org.hibernate.dialect.Dialect] (ServerService Thread Pool -- 103) HHH000400: Using dialect: org.hibernate.dialect.PostgreSQL94Dialect
22:58:05,820 INFO  [org.hibernate.type.BasicTypeRegistry] (ServerService Thread Pool -- 103) HHH000270: Type registration [java.util.UUID] overrides previous : org.hibernate.type.UUIDBinaryType@6543510a
22:58:05,822 INFO  [org.hibernate.envers.boot.internal.EnversServiceImpl] (ServerService Thread Pool -- 103) Envers integration enabled? : true
22:58:05,858 INFO  [org.hibernate.tool.schema.internal.SchemaCreatorImpl] (ServerService Thread Pool -- 103) HHH000476: Executing import script 'org.hibernate.tool.schema.internal.exec.ScriptSourceInputNonExistentImpl@4cc01a34'
22:58:05,858 INFO  [org.hibernate.hql.internal.QueryTranslatorFactoryInitiator] (ServerService Thread Pool -- 103) HHH000397: Using ASTQueryTranslatorFactory

Answer 1

JPA规范：

8.2.1.2交易类型

transaction-type属性用于指定实体是否实体经理工厂为持久性提供的经理单位必须是JTA实体管理器或资源本地实体管理器。该元素的值为JTA或RESOURCE_LOCAL。交易类型 JTA假设将提供JTA数据源- 由jta-data-source元素指定或由容器提供。通常，在Java EE环境中，事务类型为 RESOURCE_LOCAL假定将提供非JTA数据源。在 Java EE环境，如果未指定此元素，则默认是JTA。在Java SE环境中，如果未指定此元素，默认值为RESOURCE_LOCAL。

JTA是EE应用程序服务器中的默认事务类型。要使用它，您需要在WildFly中配置的数据源。然后将其添加到persistence.xml：

<persistence-unit name="pu1" transaction-type="JTA">
    <!-- classes -->
    <class>myapp.model.Address</class>
    <class>myapp.model.Transaction</class>
    <properties>
        <jta-data-source>jdbc/jndi_name_of_datasource</jta-data-source>

        <!-- hibernate -->
        <property name="hibernate.hbm2ddl.auto" value="create"/>
    </properties>
</persistence-unit>

Hibernate / JPA不创建表

1 个答案: