[FIXED] Dependency Bean injection for generic instance variable in spring

Issue

I am using Spring 4.1.5-RELEASE and java 8 for my application. On looking at the class, there are 2 parametrizations to be considered, one at class level and other at class's instance variable. On dependency injection I am not having trouble for class level parametetrization ( as I have constructor with super()), while the instance variable serviceErrorResponseProcessor, causes following error. If serviceErrorResponseProcessor variable is removed from class and bean injection, I am not seeing the error. So something is wrong in defining the generic instance variable.

Class:

public class ServiceResponseProcessor implements ResponseProcessor<T, R> {

private ErrorResponseProcessor<Error> serviceErrorResponseProcessor;
private ServiceInfoResponseProcessor serviceInfoResponseProcessor;

// respective getters and setters
}

Bean injection:

<bean id="responseProcessor"
    class="com.path.ServiceResponseProcessor">
    <property name="serviceErrorResponseProcessor" ref="beanServiceErrorResponseProcessor" />
    <property name="serviceInfoResponseProcessor" ref="beanServiceInfoResponseProcessor" />
</bean>

<bean id="beanServiceErrorResponseProcessor"
    class="com.path.processor.ErrorResponseProcessor"/>

<bean id="beanServiceInfoResponseProcessor"
    class="com.path.processor.ServiceInfoResponseProcessor"/>

Error:

Error creating bean with name 'responseProcessor' defined in class path resource [config/bean-dependency.xml]: 
Initialization of bean failed; nested exception is java.lang.reflect.MalformedParameterizedTypeException
    at com.path.ServiceResponseProcessor.testResponseProcessor(ServiceResponseProcessor.java:326)
    at com.path.ServiceResponseProcessor.testSteps(ServiceResponseProcessor.java:276)
Caused by: java.lang.reflect.MalformedParameterizedTypeException
    at com.path.ServiceResponseProcessor.testResponseProcessor(ServiceResponseProcessor.java:326)
    at com.path.ServiceResponseProcessor.testSteps(ServiceResponseProcessor.java:276)

Solution

I have found something which worked for me using spring 4.1.5-RELEASE, that is one cannot use generics in instance variable when the class where it is used for bean injection.

Class:

public class ServiceResponseProcessor implements ResponseProcessor<T, R> {

private ServiceErrorResponseProcessor serviceErrorResponseProcessor;
private ServiceInfoResponseProcessor serviceInfoResponseProcessor;

   // respective getters and setters
}

while,

ServiceErrorResponseProcessor implements ErrorResponseProcessor<Error>{
   // implementation
}

Bean injection:

<bean id="responseProcessor"
class="com.path.ServiceResponseProcessor">
<property name="serviceErrorResponseProcessor" ref="beanServiceErrorResponseProcessor" />
<property name="serviceInfoResponseProcessor" ref="beanServiceInfoResponseProcessor" />

Answered By - yellow
Answer Checked By - Terry (JavaFixing Volunteer)