我正在用JPA创建一个EJB应用程序。我创建了EJBBean,它在实体管理器中使用@PersistenceContext。我还提供了持久化中的设置。包含Hibernate信息的xml文件。我试图使用transaction type=JTA,并试图使用JNDI访问数据源。我还在服务器上提供了一些信息。Websphere Liberty的xml文件
但是,我收到了一条错误消息-
javax。ejb。EJBException:CWNEN0030E:服务器无法获取java:comp/env/SolarUniversityJpa引用的对象实例。例外信息是:java。lang.RuntimeException:CWWJP0050E:无法找到持久性提供程序组织。冬眠ejb。冬眠持久性。;嵌套的例外是:java。RuntimeException:java。lang.RuntimeException:CWWJP0050E:无法找到持久性提供程序组织。冬眠ejb。冬眠持久性。
请参考Server.xml文件后提到的错误消息以了解更多信息
Servlet
@WebServlet("/StudentServlet")
public class StudentServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
@EJB
StudentEjbBean studentEjbBean;
public StudentServlet() {
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
studentEjbBean.testJpa();
}
}
埃比安
@Stateless
@LocalBean
public class StudentEjbBean {
@PersistenceContext(name="SolarUniversityJpa")
EntityManager entityManager;
public StudentEjbBean() {
}
public void testJpa()
{
StudentDao studentDao = new StudentDaoImpl();
studentDao.SaveInformation(entityManager);
}
}
坚持不懈xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.1"
xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">
<persistence-unit name="SolarUniversityJpa"
transaction-type="JTA">
<provider>org.hibernate.ejb.HibernatePersistence</provider>
<jta-data-source>java:global/env/jdbc/MySql</jta-data-source>
<class>com.student.entity.StudentEntity</class>
<properties>
<property name="connection.driver_class" value="com.mysql.jdbc.Driver" />
<property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/SolarUniversity" />
<property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect" />
<property name="hibernate.hbm2ddl.auto" value="create" />
<property name="hibernate.show_sql" value="true" />
<property name="hibernate.format_sql" value="true" />
</properties>
</persistence-unit>
</persistence>
Server.xml
<server description="new server">
<!-- Enable features -->
<featureManager>
<feature>webProfile-7.0</feature>
<feature>localConnector-1.0</feature>
</featureManager>
<!-- To access this server from a remote client add a host attribute to
the following element, e.g. host="*" -->
<httpEndpoint httpPort="9080" httpsPort="9443"
id="defaultHttpEndpoint" />
<!-- Automatically expand WAR files and EAR files -->
<applicationManager autoExpand="true" />
<applicationMonitor updateTrigger="mbean" />
<jdbcDriver id="mySqlEmbedded" libraryRef="mySqlLib" />
<library id="mySqlLib" filesetRef="mySqlFileSet" />
<fileset id="mySqlFileSet" dir="E:/Backups"
includes="mysql-connector-java-5.1.34.jar" />
<dataSource id="jdbc/samplejpadatasource" jndiName="jdbc/MySql"
jdbcDriverRef="mySqlEmbedded">
<properties user="root" password="root"
URL="jdbc:mysql://localhost:3306/SolarUniversity">
</properties>
</dataSource>
<enterpriseApplication id="SolarUniversityEAR"
location="SolarUniversityEAR.ear" name="SolarUniversityEAR">
<!-- <classloader commonLibraryRef="MySQLLib" /> -->
</enterpriseApplication>
</server>
例外信息
[ERROR ] CNTR0019E: EJB threw an unexpected (non-declared) exception during invocation of method "testMessage". Exception data: javax.ejb.EJBException: CWNEN0030E: The server was unable to obtain an object instance for the java:comp/env/SolarUniversityJpa reference. The exception message was: java.lang.RuntimeException: CWWJP0050E: Unable to locate persistence provider org.hibernate.ejb.HibernatePersistence.; nested exception is: java.lang.RuntimeException: java.lang.RuntimeException: CWWJP0050E: Unable to locate persistence provider org.hibernate.ejb.HibernatePersistence.
at com.ibm.ejs.container.util.ExceptionUtil.EJBException(ExceptionUtil.java:461)
at [internal classes]
at com.ejb.stateless.student.EJSLocalNSLStudentEjbBean_58c656c8.testMessage(EJSLocalNSLStudentEjbBean_58c656c8.java)
at com.servlet.student.StudentServlet.doPost(StudentServlet.java:56)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1290)
at [internal classes]
Caused by (repeated) ... : java.lang.RuntimeException: java.lang.RuntimeException: CWWJP0050E: Unable to locate persistence provider org.hibernate.ejb.HibernatePersistence.
at com.ibm.ws.jpa.management.JPAPUnitInfo.getEntityManagerFactory(JPAPUnitInfo.java:960)
... 7 more
Caused by: java.lang.ClassNotFoundException: org.hibernate.ejb.HibernatePersistence
at com.ibm.ws.classloading.internal.AppClassLoader.findClassCommonLibraryClassLoaders(AppClassLoader.java:499)
... 1 more
[ERROR ] SRVE0777E: Exception thrown by application class 'com.ibm.ejs.container.util.ExceptionUtil.EJBException:461'
javax.ejb.EJBException: CWNEN0030E: The server was unable to obtain an object instance for the java:comp/env/SolarUniversityJpa reference. The exception message was: java.lang.RuntimeException: CWWJP0050E: Unable to locate persistence provider org.hibernate.ejb.HibernatePersistence.; nested exception is: java.lang.RuntimeException: java.lang.RuntimeException: CWWJP0050E: Unable to locate persistence provider org.hibernate.ejb.HibernatePersistence.
at com.ibm.ejs.container.util.ExceptionUtil.EJBException(ExceptionUtil.java:461)
at [internal classes]
at com.ejb.stateless.student.EJSLocalNSLStudentEjbBean_58c656c8.testMessage(EJSLocalNSLStudentEjbBean_58c656c8.java)
at com.servlet.student.StudentServlet.doPost(StudentServlet.java:56)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1290)
at [internal classes]
Caused by (repeated) ... : java.lang.RuntimeException: java.lang.RuntimeException: CWWJP0050E: Unable to locate persistence provider org.hibernate.ejb.HibernatePersistence.
at com.ibm.ws.jpa.management.JPAPUnitInfo.getEntityManagerFactory(JPAPUnitInfo.java:960)
... 7 more
Caused by: java.lang.ClassNotFoundException: org.hibernate.ejb.HibernatePersistence
at com.ibm.ws.classloading.internal.AppClassLoader.findClassCommonLibraryClassLoaders(AppClassLoader.java:499)
... 1 more
[ERROR ] SRVE0315E: An exception occurred: java.lang.Throwable: javax.ejb.EJBException: CWNEN0030E: The server was unable to obtain an object instance for the java:comp/env/SolarUniversityJpa reference. The exception message was: java.lang.RuntimeException: CWWJP0050E: Unable to locate persistence provider org.hibernate.ejb.HibernatePersistence.; nested exception is: java.lang.RuntimeException: java.lang.RuntimeException: CWWJP0050E: Unable to locate persistence provider org.hibernate.ejb.HibernatePersistence.
at com.ibm.ws.webcontainer.webapp.WebApp.handleRequest(WebApp.java:5000)
at [internal classes]
Caused by: javax.ejb.EJBException: CWNEN0030E: The server was unable to obtain an object instance for the java:comp/env/SolarUniversityJpa reference. The exception message was: java.lang.RuntimeException: CWWJP0050E: Unable to locate persistence provider org.hibernate.ejb.HibernatePersistence.; nested exception is: java.lang.RuntimeException: java.lang.RuntimeException: CWWJP0050E: Unable to locate persistence provider org.hibernate.ejb.HibernatePersistence.
at com.ibm.ejs.container.util.ExceptionUtil.EJBException(ExceptionUtil.java:461)
at [internal classes]
at com.ejb.stateless.student.EJSLocalNSLStudentEjbBean_58c656c8.testMessage(EJSLocalNSLStudentEjbBean_58c656c8.java)
at com.servlet.student.StudentServlet.doPost(StudentServlet.java:56)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at com.ibm.ws.webcontainer.servlet.ServletWrapper.service(ServletWrapper.java:1290)
... 1 more
Caused by (repeated) ... : java.lang.RuntimeException: java.lang.RuntimeException: CWWJP0050E: Unable to locate persistence provider org.hibernate.ejb.HibernatePersistence.
at com.ibm.ws.jpa.management.JPAPUnitInfo.getEntityManagerFactory(JPAPUnitInfo.java:960)
... 7 more
Caused by: java.lang.ClassNotFoundException: org.hibernate.ejb.HibernatePersistence
at com.ibm.ws.classloading.internal.AppClassLoader.findClassCommonLibraryClassLoaders(AppClassLoader.java:499)
... 1 more
谢谢安迪·吉伯特的建议。这可能对其他人有帮助。下面是我如何解决这些问题的。
关于问题1:
我采用了安迪说的方法。
对于问题2:
[ERROR]CNTR0020E:EJB在bean“BeanId(SolarUniverSityYear#SolarUniversityEjb.jar#StudentEjb”上调用方法“testMessage”时引发了意外(未声明)异常异常数据:java.lang.AbstractMethodError:org.hibernate.ejb.EntityManagerFactoryImpl.createEntityManager(Ljavax/persistenc)e/同步类型ELjava/util/Map;)Ljavax/persistence/EntIT经理;
我下载了支持JPA2.1的新版Hibernate。在这之后,我又遇到了另一个问题
第三期:
CNTR0020E: EJB在bean BeanId(SolarUniversityEAR#SolarUniversityEjb.jar#StudentEjbBean,null)上调用方法testMessage时抛出了一个意外(未声明)异常。异常数据:java.lang.NullPointerExcture
为了解决这个问题,我在持久性中添加了以下代码。xml(因为我使用的是transaction type=“JTA”)。这是特定于WebSphere Liberty的。资料来源:7.5.9。组织。冬眠服务jta。站台spi。JTA平台
<property name="hibernate.transaction.jta.platform"
value="org.hibernate.service.jta.platform.internal.WebSphereExtendedJtaPlatform" />
最后,我能够将信息保存在数据库中。
异常消息表示找不到Hibernate类。这是预期的,因为Liberty在jpa-2.0(OpenJPA)或jpa-2.1(eclipselink)特性中不提供Hibernate类。
如果您想在Liberty中使用Hibernate,您需要自己下载Hibernate JAR,并将其包含在应用程序中,或者配置一个共享库。
假设您已经在位置C:/hibernate
上有Hibernate jars,您可以将以下内容添加到您的server.xml:
<library id="HibernateLib">
<fileset dir="C:/hibernate" includes="*.jar"/>
</library>
然后向应用程序提供共享库,如下所示:
<enterpriseApplication id="SolarUniversityEAR" location="SolarUniversityEAR.ear" name="SolarUniversityEAR">
<classloader commonLibraryRef="HibernateLib"/>
</enterpriseApplication>
此外,这里还有一个有用的示例:
Liberty JPA Hibernate Sample
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