Java OpenJPA映射工具MetaDataException

我正在尝试使用OpenJPA完成正向映射的过程。为此，我想使用

映射工具

，但我不断得到

元数据异常

。我提供

persistence.xml

以及

orm.xml

文件作为输入，并在类路径上编译Java类，这些类定义了

orm.xml

文件中的对象

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

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();
        }
    }
});

其中编译的类文件位于

/home/vic/Downloads/apache-openjpa-2.2.1/src/java

中

输出如下：

---

这是因为

MappingTool

使用

jdbcconfigurationmpl

作为默认值。配置

MappingTool

以将数据源用于分布式配置（DistributedJDBCConfigurationMPL）

为了实现这一点，您需要从

MappingTool

复制

main

代码，并为conf创建

DistributedJDBCConfigurationMPL

，如下所示：

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

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论点。在运行自己的工具实现之后，一切都会正常工作

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();
        }
    }
});