我的META-INF/persistence.xml怎么也找不到
我用J2SE，添加了JPA相关的lib,本来是个Hibernate的程序，我写好了META-INF/persistence.xml，类所在目录的结构如下：
+工作目录名
  +lib
  <省略这里的jar文件>
  +build
  +hello
  HelloWorld.class
  Message.class
  +META-INF
  persistence.xml

build目录是我的运行目录，相关Ant代码如下：
<target name="run" depends="package" description="Build and run HelloWorld">
<java fork="true" classname="hello.HelloWorld" 
classpathref="project.classpath">
<classpath path="${build.dir}" />
</java>

  </target>
project.classpath指向的是工作目录下的lib文件夹
${build.dir}指向build目录，
结果显示：
[java] Exception in thread "main" javax.persistence.PersistenceException: No Persistence provider for EntityManager named helloWorld
  [java] at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:55)
  [java] at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:33)
  [java] at hello.HelloWorld.main(Unknown Source)
我知道是没有识别出来这个persistence.xml,该怎么解决呢？谢谢

perpersistence.xml内容如下：
<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="helloWorld">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<class>hello.Message</class>
<properties>
<property name="show_sql" value="true" />
<property name="format_sql"value="true" />
<property name="hibernate.connection.driver_class" value="org.hsqldb.jdbcDriver" />
<property name="hibernate.connection.url" value="jdbc:hsqldb:hsql://localhost" />
<property name="hibernate.connection.username" value="sa" />
<property name="hibernate.dialect" value="org.hibernate.dialect.HSQLDialect" />
<property name="hibernate.c3p0.min_size" value="5" />
<property name="hibernate.c3p0.max_size" value="20" />
<property name="hibernate.c3p0.timeout" value="300" />
<property name="hibernate.c3p0.max_statements" value="5" />
<property name="hibernate.c3p0.idle_test_period" value="3000" />
</properties>
</persistence-unit>
</persistence>

------解决方案--------------------
+META-INF
persistence.xml 
放到src目录下面去
src
 META-INF
persistence.xml