现实应用中存在很多一对多的情况，如一项订单中存在一个或多个订购项。下面就以订单为例介绍存在一对多及多对一双向关系的实体bean 开发。 In reality, there are many one to many situations, such as one or more items in an order. Here is an example of the order to introduce the existence of one to many and many to one of the two entities bean development.

ejb-4\.classpath
.....\.project
.....\.settings\org.eclipse.jdt.core.prefs
.....\bin\entity\Order.class
.....\...\......\OrderItem.class
.....\...\META-INF\persistence.xml
.....\...\orderbean\OrderDAO.class
.....\...\.........\OrderDAOBean.class
.....\...\test\ServiceTest.class
.....\lib\activation.jar
.....\...\antlr.jar
.....\...\avalon-framework.jar
.....\...\commons-logging.jar
.....\...\concurrent.jar
.....\...\ejb3-persistence.jar
.....\...\FastInfoset.jar
.....\...\getopt.jar
.....\...\hibernate-annotations.jar
.....\...\jacorb.jar
.....\...\javassist.jar
.....\...\jaxb-api.jar
.....\...\jaxb-impl.jar
.....\...\jaxb-xjc.jar
.....\...\jaxws-rt.jar
.....\...\jaxws-tools.jar
.....\...\jboss-aop-client.jar
.....\...\jboss-appclient.jar
.....\...\jboss-aspect-jdk50-client.jar
.....\...\jboss-client.jar
.....\...\jboss-common-core.jar
.....\...\jboss-deployers-client-spi.jar
.....\...\jboss-deployers-client.jar
.....\...\jboss-deployers-core-spi.jar
.....\...\jboss-deployers-core.jar
.....\...\jboss-deployers-vfs-spi.jar
.....\...\jboss-deployers-vfs.jar
.....\...\jboss-deployment.jar
.....\...\jboss-ejb3-common-client.jar
.....\...\jboss-ejb3-core-client.jar
.....\...\jboss-ejb3-ext-api-impl.jar
.....\...\jboss-ejb3-ext-api.jar
.....\...\jboss-ejb3-proxy-client.jar
.....\...\jboss-ejb3-proxy-clustered-client.jar
.....\...\jboss-ejb3-security-client.jar
.....\...\jboss-ha-client.jar
.....\...\jboss-ha-legacy-client.jar
.....\...\jboss-iiop-client.jar
.....\...\jboss-integration.jar
.....\...\jboss-j2se.jar
.....\...\jboss-jaspi-api.jar
.....\...\jboss-javaee.jar
.....\...\jboss-jsr77-client.jar
.....\...\jboss-logging-jdk.jar
.....\...\jboss-logging-log4j.jar
.....\...\jboss-logging-spi.jar
.....\...\jboss-main-client.jar
.....\...\jboss-mdr.jar
.....\...\jboss-messaging-client.jar
.....\...\jboss-metadata.jar
.....\...\jboss-remoting.jar
.....\...\jboss-security-spi.jar
.....\...\jboss-serialization.jar
.....\...\jboss-srp-client.jar
.....\...\jboss-system-client.jar
.....\...\jboss-system-jmx-client.jar
.....\...\jboss-xml-binding.jar
.....\...\jbossall-client.jar
.....\...\jbosscx-client.jar
.....\...\jbossjmx-ant.jar
.....\...\jbosssx-as-client.jar
.....\...\jbosssx-client.jar
.....\...\jbossws-common.jar
.....\...\jbossws-framework.jar
.....\...\jbossws-jboss50.jar
.....\...\jbossws-native-client.jar
.....\...\jbossws-native-core.jar
.....\...\jbossws-native-jaxrpc.jar
.....\...\jbossws-native-jaxws-ext.jar
.....\...\jbossws-native-jaxws.jar
.....\...\jbossws-native-saaj.jar
.....\...\jbossws-spi.jar
.....\...\jettison.jar
.....\...\jmx-client.jar
.....\...\jmx-invoker-adaptor-client.jar
.....\...\jnp-client.jar
.....\...\junit-4.8.2.jar
.....\...\log4j.jar
.....\...\logkit.jar
.....\...\mail.jar
.....\...\policy.jar
.....\...\scout.jar
.....\...\slf4j-api.jar
.....\...\slf4j-jboss-logging.jar
.....\...\stax-api.jar
.....\...\stax-ex.jar
.....\...\streambuffer.jar
.....\...\trove.jar
.....\...\wsdl4j.jar
.....\...\wstx.jar
.....\...\xmlsec.jar

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