再抛Jdo的问题 进来讨论啊

Question

按照http://www.csdn.net/develop/article/19/19397.shtm作的，我的build.xml是这样的
-------------build.xml----------------
<?xml version="1.0" encoding="GB2312" ?>
<project name="creditSys" default="run">
    <property name="src" location="src" />
    <property name="build" location="build" />
    <property name="build.classes" location="build/classes" />
    <property name="jdo.home" value="../../jdogenie-2.0.1"/>
    <property name="jdo.project" value="creditSys.jdogenie"/>
    <property name="jdo.lib" value="${jdo.home}/lib"/>
    <property name="jdo.tools" value="${jdo.home}/tools"/>
    <property name="jdo.license" value="${jdo.home}/license"/>
    <property name="jdbc.jar" location="../../mysql/lib/mm.mysql-2.0.4-bin.jar" />    <path id="cp">
        <pathelement path="${build.classes}"/>
        <pathelement path="${jdbc.jar}"/>
        <pathelement path="${jdo.license}"/>
        <fileset dir="${jdo.lib}" includes="*.jar"/>        <fileset dir="." includes="*.jar" />
    </path>    <target name="cleanup" description="清除所有编译生成的class文件">
        <delete>
            <fileset dir="${build.classes}" includes="**/*.class"/>
        </delete>
    </target>    <target name="compile">
        <javac debug="true" destdir="${build.classes}" srcdir="${src}" classpathref="cp"/>
    </target>    <target name="enhance" depends="cleanup, compile">
        <taskdef classpathref="cp" resource="jdogenie.tasks"/>
        <jdo-enhance project="${ant.project.name}.jdogenie" outputdir="${build.classes}" >
        <persistentaware dir="${build.classes}">
            <package name="jdogenie.*"/>
        </persistentaware>
        </jdo-enhance>
    </target>
    
    <target name="run" depends="enhance" description="Run the application">
        <java classname="jdogenie.Main" classpathref="cp" />
          
    </target></project>
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按照上面的build.xml用ant来运行，都没有问题，用java运行就不行。试了n种classpath了，总说java.lang.NullPointerException，不知道用java来运行应该怎么写命令行

Answer 1

程序有问题吗？怎么用ant好用啊，数据都写入数据库了，而且这不是我写的阿，是按照上面那个地址的源代码阿，只是改了包名
-------------------jdogenie.Main----------------------------
package jdogenie;import javax.jdo.*;
import java.util.*;
import java.io.IOException;public class Main {    public static void main(String[] args) throws Exception {
        System.out.println("开始测试功能……");        inputCard("张三","东风东路311号","223003433995431237","020-38864157",500.00f,5000.0f);
        System.out.println("信用卡已创建！");    }    /**
     * 本方法专用于获取JDO API的核心对象：存储管理器PersistenceManager
     */
    public static PersistenceManager getPersistenceManager() {
        if(pmf == null) {
            java.util.Properties p = new java.util.Properties();
            try {
                //从配置文件读入配置信息
                p.load(Main.class.getClassLoader().getResourceAsStream("/creditSys.jdogenie"));            } catch(IOException ex) {
                throw new RuntimeException(ex);
            }
            pmf = JDOHelper.getPersistenceManagerFactory(p);
        }        return pmf.getPersistenceManager();
    }
    private static PersistenceManagerFactory pmf;public static CreditCard inputCard(
        String name,
        String address,
        String idcard,
        String phone,
        float initialBalance,
        float allowOverDraft
    ) throws IdCardDuplicatedException {        CreditCard cc = new CreditCard();
        cc.setName(name);
        cc.setAddress(address);
        cc.setIdcard(idcard);
        cc.setPhone(phone);
        cc.setInitialBalance(initialBalance);
        cc.setAllowOverDraft(allowOverDraft);        //以下是自动产生的信息：
        cc.setCreateTime(new Date());
        cc.setBalance(initialBalance); //使刚创建后的余额等于初始余额，这是典型的业务逻辑        //下面将新信用卡保存到数据库，注意其中的JDO API。
        PersistenceManager pm = getPersistenceManager();
        //先检测是否已经有该身份证注册的信用卡存在：
        Query q = pm.newQuery(CreditCard.class,"idcard==_newIdcard");
        q.declareParameters("String _newIdcard");
        Collection existCards = (Collection)q.execute(idcard);
        if(existCards.iterator().hasNext()) {
            throw new IdCardDuplicatedException(); //已经该身份证号存在
        }        //身份证号没重复，以下保存该信用卡对象：
        pm.currentTransaction().begin(); //每次对数据库的更新必须放到事务中
        pm.makePersistent(cc);
        pm.currentTransaction().commit(); //提交新对象
        pm.close(); //释放JDO资源        return cc;
    }    public static class IdCardDuplicatedException extends RuntimeException {}}
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