JPA:java.lang.IllegalArgumentException:不是实体 [英] JPA: java.lang.IllegalArgumentException: Not an entity
本文介绍了JPA:java.lang.IllegalArgumentException:不是实体的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我写了一个简单的Java，它使用POJO，Servlet，JSP.我正在使用:
I wrote a simple Java that uses POJOs, servlets, JSPs. I am using:
- Tomcat 7.0.16
- Oracle 11g
- Oracle Java内部版本1.6.0_26-b03
我使用常春藤来解决我的依赖性:
I use ivy to resolve my dependencies:
<dependency org="oracle" name="ojdbc6" rev="11g" conf="default -> default" />
<dependency org="org.hibernate" name="hibernate-commons-annotations" rev="3.2.0.Final" conf="compile -> runtime" />
<dependency org="org.hibernate" name="hibernate-annotations" rev="3.5.6-Final" conf="default -> runtime" />
<dependency org="org.hibernate" name="hibernate-core" rev="3.6.5.Final" conf="default -> runtime" />
<dependency org="org.hibernate" name="hibernate-validator" rev="4.0.2.GA" conf="runtime -> runtime" />
<dependency org="org.hibernate.javax.persistence" name="hibernate-jpa-2.0-api" rev="1.0.1.Final" conf="compile -> default" />
<dependency org="org.hibernate" name="hibernate-entitymanager" rev="3.6.5.Final" conf="compile -> default" />
我的POJO车辆包含以下注释:
My POJO Vehicle contains the following annotations:
import java.io.Serializable;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Version;
@Entity
public class Vehicle implements Serializable{
/**
*
*/
private static final long serialVersionUID = 8560417193012227968L;
@Id
@GeneratedValue(strategy=GenerationType.AUTO)
private Long identifier;
private String serialNumber;
private String model;
private String manufacturer;
private int year;
private String condition;
@Version
private long version;
public Vehicle(){
}
运行代码时，我得到以下信息:
When I run my code, I get the following:
2013-10-28 11:40:50 ERROR SqlVehicleService:42 - java.lang.IllegalArgumentException: Not an entity: class com.foo.demos.car.model.Vehicle
java.lang.IllegalArgumentException: Not an entity: class com.foo.demos.car.model.Vehicle
at org.hibernate.ejb.metamodel.MetamodelImpl.entity(MetamodelImpl.java:160)
at org.hibernate.ejb.criteria.QueryStructure.from(QueryStructure.java:138)
at org.hibernate.ejb.criteria.CriteriaQueryImpl.from(CriteriaQueryImpl.java:179)
at com.foo.demos.car.impl.SqlVehicleService.getVehicles(SqlVehicleService.java:37)
at org.apache.jsp.secured.vehicles_jsp._jspService(vehicles_jsp.java:194)
at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:419)
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:389)
at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:333)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:240)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:164)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:572)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:164)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:100)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:563)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:403)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:301)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:162)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:309)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
我的persistence.xml不包含有关Vehicle的任何信息.我的理解是，注释就足够了.正确吗?
My persistence.xml does not contain any information about Vehicle. My understanding is that annotations are enough. Is that correct?
<?xml version="1.0" encoding="UTF-8"?>
<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="cardemo">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<!-- the JNDI data source -->
<non-jta-data-source>java:comp/env/jdbc/cardemo</non-jta-data-source>
<properties>
<property name="javax.persistence.validation.mode" value="NONE" />
<!-- if this is true, hibernate will print (to stdout) the SQL it executes,
so you can check it to ensure it"s not doing anything crazy -->
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.format_sql" value="true" />
<!-- since most database servers have slightly different versions of the
SQL, Hibernate needs you to choose a dialect so it knows the subtleties of
talking to that server -->
<property name="hibernate.dialect" value="org.hibernate.dialect.Oracle10gDialect" />
<!-- this tell Hibernate to update the DDL when it starts, very useful
for development, dangerous in production -->
<property name="hibernate.hbm2ddl.auto" value="update" />
</properties>
</persistence-unit>
</persistence>
我显然忽略了一些东西.那是什么?我想念什么?
I obviously overlooked something. What's that? What am I missing?
推荐答案
我的persistence.xml不包含有关Vehicle的任何信息.我的理解是，注释就足够了.正确吗?
My persistence.xml does not contain any information about Vehicle. My understanding is that annotations are enough. Is that correct?
不，不是.这些实体必须在persistence.xml文件中的persistence-unit元素下列出:
No, it's not. The entities must be listed in the persistence.xml file, under the persistence-unit element:
<class>com.foo.demos.car.model.Vehicle</class>
这篇关于JPA:java.lang.IllegalArgumentException:不是实体的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
查看全文
