OpenJPA MappingTool MetaDataException

Question

我正在尝试使用OpenJPA进行前向映射的过程。我想为此目的使用MappingTool，但我一直在获取MetaDataException。我提供persistence.xml和orm.xml文件作为输入，以及在类路径上编译的orm.xml类，这些类路径定义了来自orm.xml文件的对象。

我像这样运行MappingTool：

java -cp  /home/vic/openmdx/dev/openmdx2/jre-1.6/core/lib/openmdx-base.jar:/home/vic/Downloads/apache-openjpa-2.2.1/src/java:/home/vic/Downloads/apache-openjpa-2.2.1/openjpa-2.2.1.jar:/home/vic/Downloads/apache-openjpa-2.2.1/openjpa-all-2.2.1.jar org.apache.openjpa.jdbc.meta.MappingTool -p persistence.xml -schemaAction build orm.xml

编译的类文件在/home/vic/Downloads/apache-openjpa-2.2.1/src/java中的位置。

产出如下：

32 openjpa INFO主openjpa.jdbc.JDBC -使用字典类org.apache.openjpa.jdbc.sql.MySQLDictionary“。106个openjpa.Tool主openjpa.Tool-映射工具，运行在带有操作"buildSchema“的"class org.test.classDiag.jpa3.properties”类型上。407 openjpa警告主openjpa.Runtime --在“org.omg.Model1.jpa3.”412 openjpa警告主openjpa.Runtime中没有发现持久属性--在“org.omg.Model1.jpa.StrurereField$Slice”441 openjpa警告主openjpa.Runtime中没有找到持久属性--在“org.omg.Model1.jpa3. persistent $ openjpa.Runtime”455 openjpa警告主openjpa.Runtime中没有找到持久属性--在“org.omg.Model1.jpa-view$”465 openjpa警告主openjpa.Runtime中没有找到持久属性--在"org.omg.model1 org.omg.model1警告主openjpa.Runtime“中没有找到持久属性。.jpa3.Constant$Slice“504 openjpa警告主openjpa.Runtime --在"org.omg.model1.jpa3.Import$Slice”515 openjpa警告主openjpa.Runtime中没有找到持久属性--在“org.omg.Model1.jpa3.Constraint$openjpa.Runtime”线程中的异常" main“ org.apache.openjpa.util.MetaDataException: Type "class org.test.classDiag.jpa3.”中没有持久性元数据。在org.apache.openjpa.jdbc.meta.MappingTool.getMapping(MappingTool.java:688) at org.apache.openjpa.jdbc.meta.MappingTool.buildSchema(MappingTool.java:754) at org.apache.openjpa.jdbc.meta.MappingTool.run(MappingTool.java:652) at org.apache.openjpa.jdbc.meta.MappingTool.run(MappingTool.java:1087) at org.apache.openjpa.jdbc.meta.MappingTool.run(MappingTool.java:1001) at org.apache.openjpa.jdbc.meta.MappingTool$1.run(( org.apache.openjpa.lib.conf.Configurations.launchRunnable(Configurations.java:748) at org.apache.openjpa.lib.conf.Configurations.runAgainstAllAnchors(Configurations.java:738) at org.apache.openjpa.jdbc.meta.MappingTool.main(MappingTool.java:932) )

我的persistence.xml：

<?xml version="1.0"?>
<persistence 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_1_0.xsd" version="1.0">
    <persistence-unit name="openjpa"  transaction-type="RESOURCE_LOCAL">
        <provider>org.apache.openjpa.persistence.PersistenceProviderImpl</provider>
         <class>org.test.classdiag.jpa3.Animal</class>
                 <class>org.test.classdiag.jpa3.Cat</class>
                 <class>org.test.classdiag.jpa3.Dog</class>

        <properties>
            <property name="openjpa.Log" value="SQL=TRACE"/>
            <!-- <property name="openjpa.Log" value="DefaultLevel=WARN, Tool=INFO" /> -->
            <property name="openjpa.jdbc.MappingDefaults" value="IndexLogicalForeignKeys=false,IndexDiscriminator=false"/>
            <property name="openjpa.ConnectionURL" value="jdbc:mysql://localhost:3306/TEST_OPENMDX"/>
            <property name="openjpa.ConnectionDriverName" value="com.mysql.jdbc.Driver"/>
            <property name="openjpa.ConnectionUserName" value="root"/>
            <property name="openjpa.ConnectionPassword" value="root"/>
        </properties>
    </persistence-unit>
</persistence>

我的orm.xml for Animal

<access>FIELD</access>
<entity class="org.test.classdiag.jpa3.Animal">
  <table name="OTT0CLAG_ANIMAL"/>
  <inheritance strategy="JOINED"/>
  <discriminator-value>org:test:classdiag:Animal</discriminator-value>
  <discriminator-column name="DTYPE" discriminator-type="STRING"/>
  <attributes>
    <basic name="colour">
      <column name="COLOUR" nullable="true"/>
    </basic>
    <basic name="breed">
      <column name="BREED" nullable="true"/>
    </basic>
    <basic name="name">
      <column name="NAME" nullable="true"/>
    </basic>
    <one-to-many name="openmdxjdoSlices" mapped-by="openmdxjdoIdentity">
      <map-key name="openmdxjdoIndex"/>
    </one-to-many>
  </attributes>
</entity>

Answer 1

这是因为MappingTool使用JDBCConfigurationImpl作为默认值。将MappingTool配置为为分布式配置(DistributedJDBCConfigurationImpl)使用数据源。

为了达到这个目的，您需要从main复制MappingTool代码，并为conf创建一个DistributedJDBCConfigurationImpl，如下所示：

String[] arguments = new String[] { "-action", "buildSchema", "-foreignKeys", "false", "-openjpa.Tool", "false" };
Options opts = new Options();
final String[] args = opts.setFromCmdLine(arguments);
Configurations.runAgainstAllAnchors(opts, new Configurations.Runnable() {

    @Override
    public boolean run(Options opts) throws IOException, SQLException {
        JDBCConfiguration conf = new DistributedJDBCConfigurationImpl();
        conf.setLogFactory(new NoneLogFactory());
        try {
            return MappingTool.run(conf, args, opts);
        } finally {
            conf.close();
        }
    }
});

把论点改成你自己的。在运行您自己的工具实现之后，一切都将正常工作。