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使用@Autowired时java.lang.IllegalArgumentException

[英]java.lang.IllegalArgumentException when use @Autowired

 原文  2016-03-30 03:03:20  9   3    java/ spring

问题描述

When i run the project I get a IllegalArgumentException,The problem is that I autowired the StudentService(it's a class implements IStudentService).But when I autowired the IStudentService,the problem is solved.People told me to do like this,but they don't tell me why.I want to know the reason which cause the problem.Any answers are appreciated :> 当我运行项目时，我收到一个IllegalArgumentException，问题是我自动连接了StudentService（这是一个实现IStudentService的类）。但是当我自动连接了IStudentService时，问题得以解决。人们告诉我要这样做，但他们却没有告诉我为什么。我想知道导致问题的原因。任何答案都值得赞赏：>

StudentController 学生控制器 

@Controller
        public class StudentController {
            @Autowired
            StudentService studentService;

            @RequestMapping("get")
            public String get(){
                Student student = new Student();
                student.setName("abc");
                try {
                    studentService.save(student);
                } catch (Exception e) {
                    e.printStackTrace();
                }
                return "somwhere";
            }
        }

StudentService 学生服务 

@Service
public class StudentService implements IStudentService{
    @Autowired
    IStudentDao studentDao;

    public Student getStudent(String id) throws Exception {
        return studentDao.query(id);
    }

    public List<Student> getAll() throws Exception{
        return studentDao.queryAll();
    }

    @Transactional
    public void save(Student student)throws Exception{
        studentDao.save(student);
    }

    @Transactional
    public void delete(Student student) throws Exception{
        studentDao.delete(student);
    }
}

IStudentService IStudentService 

public interface IStudentService {
    public Student getStudent(String id) throws Exception;

    public List<Student> getAll() throws Exception;

    public void save(Student student)throws Exception;

    public void delete(Student student) throws Exception;
}

stack trace 堆栈跟踪 

**Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'studentController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.gtis.service.StudentService com.gtis.controller.StudentController.studentService; nested exception is java.lang.IllegalArgumentException: Can not set com.gtis.service.StudentService field com.gtis.controller.StudentController.studentService to com.sun.proxy.$Proxy30
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1146)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:633)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:651)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:602)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:665)
    at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:521)
    at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:462)
    at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    at javax.servlet.GenericServlet.init(GenericServlet.java:244)
    at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:595)
    at org.eclipse.jetty.servlet.ServletHolder.initialize(ServletHolder.java:385)
    at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:862)
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:300)
    at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1341)
    at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1334)
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:744)
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:497)
    at org.eclipse.jetty.maven.plugin.JettyWebAppContext.doStart(JettyWebAppContext.java:281)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
    at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:60)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:154)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
    at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:60)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
    at org.eclipse.jetty.server.Server.start(Server.java:357)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
    at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:60)
    at org.eclipse.jetty.server.Server.doStart(Server.java:324)
    at org.eclipse.jetty.maven.plugin.JettyServer.doStart(JettyServer.java:68)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.maven.plugin.AbstractJettyMojo.startJetty(AbstractJettyMojo.java:564)
    at org.eclipse.jetty.maven.plugin.AbstractJettyMojo.execute(AbstractJettyMojo.java:360)
    at org.eclipse.jetty.maven.plugin.JettyRunWarExplodedMojo.execute(JettyRunWarExplodedMojo.java:73)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:101)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:209)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:84)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:59)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.singleThreadedBuild(LifecycleStarter.java:183)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:161)
    at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:320)
    at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:156)
    at org.apache.maven.cli.MavenCli.execute(MavenCli.java:537)
    at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:196)
    at org.apache.maven.cli.MavenCli.main(MavenCli.java:141)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:606)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:290)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:230)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:409)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:352)
    at org.codehaus.classworlds.Launcher.main(Launcher.java:47)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.gtis.service.StudentService com.gtis.controller.StudentController.studentService; nested exception is java.lang.IllegalArgumentException: Can not set com.gtis.service.StudentService field com.gtis.controller.StudentController.studentService to com.sun.proxy.$Proxy30
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:517)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:87)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:286)
    ... 68 more
Caused by: java.lang.IllegalArgumentException: Can not set com.gtis.service.StudentService field com.gtis.controller.StudentController.studentService to com.sun.proxy.$Proxy30
    at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:164)
    at sun.reflect.UnsafeFieldAccessorImpl.throwSetIllegalArgumentException(UnsafeFieldAccessorImpl.java:168)
    at sun.reflect.UnsafeObjectFieldAccessorImpl.set(UnsafeObjectFieldAccessorImpl.java:81)
    at java.lang.reflect.Field.set(Field.java:741)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:513)
    ... 70 more

2016-03-30 11:34:58.126:WARN:/demo:main: unavailable
org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'studentController': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.gtis.service.StudentService com.gtis.controller.StudentController.studentService; nested exception is java.lang.IllegalArgumentException: Can not set com.gtis.service.StudentService field com.gtis.controller.StudentController.studentService to com.sun.proxy.$Proxy30
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:289)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1146)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:458)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:296)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:223)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:293)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:633)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:932)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:479)
    at org.springframework.web.servlet.FrameworkServlet.configureAndRefreshWebApplicationContext(FrameworkServlet.java:651)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:602)
    at org.springframework.web.servlet.FrameworkServlet.createWebApplicationContext(FrameworkServlet.java:665)
    at org.springframework.web.servlet.FrameworkServlet.initWebApplicationContext(FrameworkServlet.java:521)
    at org.springframework.web.servlet.FrameworkServlet.initServletBean(FrameworkServlet.java:462)
    at org.springframework.web.servlet.HttpServletBean.init(HttpServletBean.java:136)
    at javax.servlet.GenericServlet.init(GenericServlet.java:244)
    at org.eclipse.jetty.servlet.ServletHolder.initServlet(ServletHolder.java:595)
    at org.eclipse.jetty.servlet.ServletHolder.initialize(ServletHolder.java:385)
    at org.eclipse.jetty.servlet.ServletHandler.initialize(ServletHandler.java:862)
    at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:300)
    at org.eclipse.jetty.webapp.WebAppContext.startWebapp(WebAppContext.java:1341)
    at org.eclipse.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1334)
    at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:744)
    at org.eclipse.jetty.webapp.WebAppContext.doStart(WebAppContext.java:497)
    at org.eclipse.jetty.maven.plugin.JettyWebAppContext.doStart(JettyWebAppContext.java:281)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
    at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:60)
    at org.eclipse.jetty.server.handler.ContextHandlerCollection.doStart(ContextHandlerCollection.java:154)
    at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:68)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:132)
    at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:114)
    at *

3 个解决方案

解决方案1
 1  2016-03-30 03:56:33

当您的业务方法具有@Transactional批注时，Spring将为您的bean创建一个代理来处理事务。当您的StudentService类实现一个接口时，Spring将创建一个基于JDK接口的代理，而不是基于CGLIB类的代理。这意味着Spring将创建一个新的代理。实现IStudentService并将其委托给StudentService的类Spring现在管理并用于注入的bean不再是继承的StudentService而是IStudentService的代理。如果您真的想注入StudentService，则可以指示Spring代理该类而不是使用@EnableTransactionManagement（proxyTargetClass = true）的接口

解决方案2
 0  2016-03-30 03:16:11

If I understand you right, IStudentService is an interface. 如果我理解正确，则IStudentService是一个接口。 From the error you get, I'm guessing you have the IStudentService interface annotated as a Spring bean in your application context, but not the concrete class StudentService. 从您得到的错误中，我猜您在应用程序上下文中将IStudentService接口标注为Spring Bean，但没有具体的类StudentService。 So when Spring tries to find a bean to autowire, it doesn't see a bean of type StudentService. 因此，当Spring尝试查找要自动装配的bean时，它看不到StudentService类型的bean。

解决方案3
 0 已采纳  2016-03-30 03:29:08

As you mentioned in comments you are using Transaction annotation and <tx:annotation-driven/> tag is in your application context, it means your class in implementing the proxy interface, so spring is actually creating a object of new class which implements your interfaces but not inherit your class Student Service. 正如您在评论中提到的那样，您正在使用Transaction注解，并且<tx:annotation-driven/>标记位于您的应用程序上下文中，这意味着您的类正在实现代理接口，因此spring实际上正在创建一个新类的对象来实现您的接口但不能继承您的班级学生服务。
Therefore the autowiring is not working with Student Service. 因此，自动装配不适用于学生服务。

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