Question

我正在尝试将spring bean注入JSF bean，我使用的是Spring 3.1和JSF 2（Mojarra 2.1.7）

我没有多说话，我的配置和代码以及以下列出的例外：

StudentService.java：

@Scope(proxyMode=ScopedProxyMode.TARGET_CLASS)
public class StudentsService extends AbstractMaqraaService {

    @Override
    public Set<Class<?>> getTypes() {
        // TODO Auto-generated method stub
        return null;
    }

    public Student registerStudent(Student student) {
        return this.store(student);
    }

}

StudentRegistrationMBean.java：

@ManagedBean(name="studentRegistrationMBean") 
@SessionScoped
public class StudentRegistrationMBean extends AbstractMBean {

    private Student student;
    @ManagedProperty (value="#{studentsService}")
    private StudentsService studentsService;

    public StudentRegistrationMBean() {
        this.student = new Student();
    }

    /*Setters and getters omitted here only*/

    public String register() {

        studentsService.registerStudent(student);
        return "manageStudents";
    }
}

模块上下文xml文件中的Spring bean：

<bean id="abstractMaqraaService" class="org.tts.maqraa.service.AbstractMaqraaService" abstract="true"/>

<bean id="studentsService" class="org.tts.maqraa.service.StudentsService" lazy-init="default" parent="abstractMaqraaService"/>

面-config.xml中：

...
<application>
        <el-resolver>org.springframework.web.jsf.el.SpringBeanFacesELResolver</el-resolver>
</application>
...

Eception：

TRACE [http-bio-8080-exec-3] (SpringBeanELResolver.java:53) - Successfully resolved variable 'studentsService' in Spring BeanFactory
DEBUG [http-bio-8080-exec-3] (AbstractBeanFactory.java:245) - Returning cached instance of singleton bean 'studentsService'
نوار 13, 2012 11:10:45 ص com.sun.faces.application.view.FaceletViewHandlingStrategy handleRenderException
SEVERE: Error Rendering View[/teacher/registerNewStudent.xhtml]
com.sun.faces.mgbean.ManagedBeanCreationException: Unable to set property studentsService for managed bean studentRegistrationMBean
    at com.sun.faces.mgbean.ManagedBeanBuilder$BakedBeanProperty.set(ManagedBeanBuilder.java:615)
    at com.sun.faces.mgbean.ManagedBeanBuilder.buildBean(ManagedBeanBuilder.java:133)
    ...
    at java.lang.Thread.run(Unknown Source)
Caused by: javax.el.ELException: Cannot convert org.tts.maqraa.service.StudentsService@8f65bc0 of type class $Proxy10 to class org.tts.maqraa.service.StudentsService
    at org.apache.el.lang.ELSupport.coerceToType(ELSupport.java:420)
    at org.apache.el.ExpressionFactoryImpl.coerceToType(ExpressionFactoryImpl.java:47)
    at com.sun.faces.el.ELUtils.coerce(ELUtils.java:536)
    at com.sun.faces.mgbean.BeanBuilder$Expression.evaluate(BeanBuilder.java:592)
    at com.sun.faces.mgbean.ManagedBeanBuilder$BakedBeanProperty.set(ManagedBeanBuilder.java:606)
    ... 47 more

ERROR [http-bio-8080-exec-3] (MaqraaExceptionHandler.java:83) - Exception
javax.el.ELException: Cannot convert org.tts.maqraa.service.StudentsService@8f65bc0 of type class $Proxy10 to class org.tts.maqraa.service.StudentsService
    at org.apache.el.lang.ELSupport.coerceToType(ELSupport.java:420)
    ...
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
    at java.lang.Thread.run(Unknown Source)

我在谷歌进行了很多搜索，发现很多问题都像我这样的问题，但没有任何帮助我，我希望我会找到我的特殊情况的解决方案!!

Answer 1

使用<aop:aspectj-autoproxy proxy-target-class="true"/>强制使用JDK代理而不是CGLIB

Answer 2

如果您像这样注入Spring服务，请不要忘记为您的服务创建setter：

@ManagedProperty (value="#{studentsService}")
private StudentsService studentsService;

public void setStudentsService (StudentsService studentsService)
{
    this.studentsService = studentsService;
}

使用@Autowired注释时无需执行此操作。

看看这个answer这是关于不使用接口来使用你的代理。

将spring bean注入JSF bean时出现Proxy异常

2 个答案: