java - Maven OpenJPA SQL生成问题

我正在尝试将sql generator目标添加到我的openjpa插件中。我使用的是OpenJPA 2.2.0。我让jpa Enhancer处理pom.sql文件的以下相关部分：

<build>

    <pluginManagement>
        <plugins>
            <plugin>
                <groupId>org.apache.openjpa</groupId>
                <artifactId>openjpa-maven-plugin</artifactId>
                <version>${org.apache.openjpa.version}</version>
                <configuration>
                    <includes>org/someorg/models/local/*.class</includes>

                    <addDefaultConstructor>true</addDefaultConstructor>
                    <connectionDriverName>org.postgresql.Driver</connectionDriverName>
                    <enforcePropertyRestrictions>true</enforcePropertyRestrictions>
                    <sqlFile>src/main/resources/sql/create.sql</sqlFile>
                </configuration>
            </plugin>
        </plugins>
    </pluginManagement>

    <plugins>

        <plugin>
            <groupId>org.apache.openjpa</groupId>
            <artifactId>openjpa-maven-plugin</artifactId>
            <version>${org.apache.openjpa.version}</version>

            <executions>
                <execution>
                    <id>enhancer</id>
                    <phase>process-classes</phase>
                    <goals>
                        <goal>enhance</goal>
                    </goals>
                </execution>
            </executions>
            <dependencies>
                <dependency>
                    <groupId>org.apache.openjpa</groupId>
                    <artifactId>openjpa</artifactId>
                    <!-- set the version to be the same as the level in your runtime -->
                    <version>${org.apache.openjpa.version}</version>
                </dependency>
            </dependencies>
        </plugin>
</plugins>

然后我尝试将以下内容添加到openjpa插件的执行部分：

<execution>
    <id>sql</id>
    <phase>generate-resources</phase>
    <goals>
        <goal>sql</goal>
    </goals>
</execution>

执行mvn -e install命令时出现以下错误：
http://pastebin.com/TENgXezJ

在没有-e开关的情况下运行的较短版本：

[ERROR]
Failed to execute goal org.apache.openjpa:openjpa-maven-plugin:2.2.0:sql(sql) on project batchpoc:
Execution sql of goal org.apache.openjpa:openjpa-maven-plugin:2.2.0:sql failed: MetaDataFactory could not be configured
(conf.newMetaDataFactoryInstance() returned null).
This might mean that no configuration properties were found.
Ensure that you have a META-INF/persistence.xml file, that it is available in your classpath,
or that the properties file you are using for configuration is available.
If you are using Ant, please see the <properties> or <propertiesFile> attributes of the task's nested <config> element. This can also occur if your OpenJPA distribution jars are corrupt,
or if your security policy is overly strict. -> [Help 1]
[ERROR]

我想念什么？

最佳答案

好的，所以我自己解决了。显然，窍门不是在pom.xml内部，而是在persistence.xml中的持久性单元定义中

真的很简单。我刚刚添加

<property name="openjpa.jdbc.SynchronizeMappings" value="buildSchema"/>

我完成了。

显然，对于OpenJPA，您还需要根据此处的信息列出希望生成的实体类：
http://planet.jboss.org/post/generate_a_database_schema_with_openjpa_and_hibernate_on_jboss_as_7

因为我之前已经列出了我的课程，所以我不认为这是必需的步骤。