Question

I am learning Spring and writing a simple program to inject a property into a POJO. Below is the main class —

public class test {
    public static void main (String[] args) {
        ApplicationContext context = new ClassPathXmlApplicationContext("Beans.xml");
        MySpring sm = (MySpring)context.getBean("myspring");
        System.out.println(sm);
    }

}

The POJO is below —

  public class MySpring {
    public String count;
    void setcount(String val){
        this.count = val;
    }
    String getcount(){
        return count;
    }

}

And the config file is below —

   <?xml version="1.0" encoding="UTF-8"?>

<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
    http://www.springframework.org/schema/beans/spring-beans-3.0.xsd">
  <bean id="myspring" class="MySpring" >
   <property name="count" value="PowerShell" />
   </bean>
</beans>

However I am getting the following error when I run the test.java class —

 Exception in thread "main" org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'myspring' defined in class path resource [Beans.xml]: Error setting property values; nested exception is org.springframework.beans.NotWritablePropertyException: Invalid property 'count' of bean class [MySpring]: Bean property 'count' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.applyPropertyValues(AbstractAutowireCapableBeanFactory.java:1396)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1118)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
    at 
.....
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:139)
    at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:83)
    at test.main(test.java:7)
Caused by: org.springframework.beans.NotWritablePropertyException: Invalid property 'count' of bean class [MySpring]: Bean property 'count' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter?
    at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:1064)
    at org.springframework.beans.BeanWrapperImpl.setPropertyValue(BeanWrapperImpl.java:924)

I know this is a common error but am not able to find the root cause as everything seems fine. Any pointers on what might be the issue is highly appreciated.

Answer 1

Bean property ‘count’ is not writable or has an invalid setter method

You need to have a setter for count property