带蚂蚁的OpenJPA ReverseMappingTool

Question

所以我希望这是个简单的问题。我下载了openjpa-all-2.3.0.jar (和mysql-连接器-java-5.1.31-bin.jar)，所以，我把它作为我的build.xml

<?xml version="1.0" ?>
<project name="reverser" default="reversemap" basedir=".">
    <taskdef name="reversemappingtool" classname="org.apache.openjpa.jdbc.ant.ReverseMappingToolTask">
        <classpath>
                <pathelement location="${basedir}/mysql-connector-java-5.1.31-bin.jar" />
                <pathelement location="${basedir}/openjpa-all-2.3.0.jar" />
        </classpath>
    </taskdef>
    <target name="reversemap">
        <reversemappingtool package="com.whatever.dbresults" directory="${basedir}/src" customizerProperties="${basedir}/conf/reverse.properties" metadata="none" generateAnnotations="true" />
    </target>
</project>

在我的reverse.properties文件中，我有：

ConnectionDriverName=com.mysql.jdbc.Driver
ConnectionDriverURL=jdbc:mysql://localhost:3306/db
ConnectionUser=user
ConnectionPassword=pw

当我这么做的时候，我得到：

/tmp/apache-openjpa-2.3.0/build.xml:10: <openjpa-2.3.0-r422266:1540826 fatal user error> org.apache.openjpa.util.UserException: 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@ec63420c". 
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.getConnectionFactory(JDBCConfigurationImpl.java:732)
at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getDataSource(JDBCConfigurationImpl.java:878)
at org.apache.openjpa.jdbc.conf.JDBCConfigurationImpl.getDataSource2(JDBCConfigurationImpl.java:920)
at org.apache.openjpa.jdbc.schema.SchemaGenerator.<init>(SchemaGenerator.java:85)
at org.apache.openjpa.jdbc.meta.ReverseMappingTool.run(ReverseMappingTool.java:2009)
at org.apache.openjpa.jdbc.ant.ReverseMappingToolTask.executeOn(ReverseMappingToolTask.java:295)

这可能是调试此问题的错误方法，但跟踪了在ReverseMappingToolTask.java第282行加载的属性文件，然后将其传递给

flags.customizer.setConfiguration(customProps);

在打电话之前

ReverseMappingTool.run(conf, files, flags, loader);

这一错误似乎发生在ReverseMappingTool的第2009行，它似乎从未触及过“旗帜”。

井。我的“调试”可能是一个无后遗症/红鲱鱼/什么你有。如何使反向映射尽可能以最简单的方式工作？我只想和蚂蚁一起用，而不是maven，等等。

编辑2014-08-13 OK，通过将build.xml更改为

<?xml version="1.0" ?>
<project name="reverser" default="reversemap" basedir=".">
    <taskdef name="reversemappingtool" classname="org.apache.openjpa.jdbc.ant.ReverseMappingToolTask">
        <classpath>
            <pathelement location="${basedir}/mysql-connector-java-5.1.31-bin.jar" />
            <pathelement location="${basedir}/openjpa-all-2.3.0.jar" />
        </classpath>
    </taskdef>
    <target name="reversemap">
        <reversemappingtool package="com.whatever.dbresults" directory="${basedir}/src" metadata="none" generateAnnotations="true">
            <config 
                connectionDriverName="com.mysql.jdbc.Driver"
                connectionURL="jdbc:mysql://localhost:3306/db"
                connectionUserName="user"
                connectionPassword="pw"
            />
        </reversemappingtool>
    </target>
</project>

但是，现在，我明白：

<openjpa-2.3.0-r422266:1540826 fatal user error> org.apache.openjpa.util.MetaDataException: 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.

谢谢!

Answer 1

好吧，好吧，我终于让它起作用了。当然，我不知道这是不是“正确”的方式。但是，它生成了我的类，这就是我真正想要的。

因此，我的新构建文件如下所示：

<?xml version="1.0" ?>
<project name="reverser" default="reversemap" basedir=".">
    <taskdef name="reversemappingtool" classname="org.apache.openjpa.jdbc.ant.ReverseMappingToolTask">
        <classpath /> <!-- removed classpath for the sake of making this post short -->
    </taskdef>
    <target name="reversemap">
        <reversemappingtool package="com.whatever.db" directory="${basedir}/src" metadata="none" generateAnnotations="true">
            <config propertiesFile="persistence.xml" />
        </reversemappingtool>
    </target>
</project>

而且，我的persistence.xml看起来

<?xml version="1.0"?>
<persistence xmlns="http://java.sun.com/xml/ns/persistence" version="2.0">
  <persistence-unit name="openjpa">
    <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
    <properties>
      <property name="openjpa.ConnectionURL" value="jdbc:mysql://localhost:3306/db"/>
      <property name="openjpa.ConnectionDriverName" value="com.mysql.jdbc.Driver"/>
      <property name="openjpa.ConnectionUserName" value="user"/>
      <property name="openjpa.ConnectionPassword" value="password"/>
      <property name="openjpa.Log" value="DefaultLevel=WARN, Tool=INFO"/>
    </properties>
  </persistence-unit>
</persistence>

所以。我觉得这样就行了。希望如果其他人想知道如何使用ant和java完成反转地图，这将有所帮助。