<!-- 配置bean -->     <bean id="sessionFactory" class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">             <property name="configLocation" value="classpath:hibernate.cfg.xml"></property>     </bean>     <bean id="studentDao" class="top.xzit.dao.Impl.StudentDaoImpl">             <property name="sessionFactory" ref="sessionFactory"></property>     </bean>     <bean id="studentService" class="top.xzit.service.impl.StudentServiceImpl">             <property name="studentDao" ref="studentDao">

報錯資訊：Invalid（無效） property 'studentDao' of bean class [top.xzit.service.impl.StudentServiceImpl]

我在StudentServiceImpl裡面是這麼寫的：

public class StudentServiceImpl implements StudentService{     private StudentDao studentdao;          public void setStudentdao(StudentDao studentdao) {         this.studentdao = studentdao;     }

    @Override     public List<Student> login(Student student) {                  return studentdao.login(student);     }

}

看懂了嗎？注入屬性的時候，name要和你自己new的一樣，不然注入不進去。

附帶錯誤資訊一邊後人搜尋：

19:04:24,936 ERROR ContextLoader:353 - Context initialization failed org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'studentService' defined in class path resource [applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'studentDao' of bean class [top.xzit.service.impl.StudentServiceImpl]: Bean property 'studentDao' is not writable or has an invalid setter method. Did you mean 'studentdao'?     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1518)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1226)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)     at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)     at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)     at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)     at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)     at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:446)     at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:328)     at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)     at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)     at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)     at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)     at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)     at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)     at java.util.concurrent.FutureTask.run(Unknown Source)     at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)     at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)     at java.lang.Thread.run(Unknown Source) Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'studentDao' of bean class [top.xzit.service.impl.StudentServiceImpl]: Bean property 'studentDao' is not writable or has an invalid setter method. Did you mean 'studentdao'?     at org.springframework.beans.BeanWrapperImpl.createNotWritablePropertyException(BeanWrapperImpl.java:231)     at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:423)     at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:280)     at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:95)     at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:75)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1514)     ... 22 more 十月 04, 2018 7:04:24 下午 org.apache.catalina.core.StandardContext listenerStart 嚴重: Exception sending context initialized event to listener instance of class org.springframework.web.context.ContextLoaderListener org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'studentService' defined in class path resource [applicationContext.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'studentDao' of bean class [top.xzit.service.impl.StudentServiceImpl]: Bean property 'studentDao' is not writable or has an invalid setter method. Did you mean 'studentdao'?     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1518)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1226)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:482)     at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:306)     at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)     at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:302)     at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:197)     at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:772)     at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:839)     at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:538)     at org.springframework.web.context.ContextLoader.configureAndRefreshWebApplicationContext(ContextLoader.java:446)     at org.springframework.web.context.ContextLoader.initWebApplicationContext(ContextLoader.java:328)     at org.springframework.web.context.ContextLoaderListener.contextInitialized(ContextLoaderListener.java:107)     at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4939)     at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5434)     at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)     at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1559)     at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1549)     at java.util.concurrent.FutureTask.run(Unknown Source)     at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)     at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)     at java.lang.Thread.run(Unknown Source) Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'studentDao' of bean class [top.xzit.service.impl.StudentServiceImpl]: Bean property 'studentDao' is not writable or has an invalid setter method. Did you mean 'studentdao'?     at org.springframework.beans.BeanWrapperImpl.createNotWritablePropertyException(BeanWrapperImpl.java:231)     at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:423)     at org.springframework.beans.AbstractNestablePropertyAccessor.setPropertyValue(AbstractNestablePropertyAccessor.java:280)     at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:95)     at org.springframework.beans.AbstractPropertyAccessor.setPropertyValues(AbstractPropertyAccessor.java:75)     at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1514)     ... 22 more