Spring can't autowire Map bean

Question

I\'ve defined a map in spring as such:

Answer 1

Seems like your @Qualifier(value = "AdditionalParams") is not working.

Try using the map by following annotation :

@Resource
private Properties AdditionalParams;

and keeping your applicationContext.xml file intact.

Answer 2

Starting with Spring 4.3, @Autowired can inject lists and maps and the given code in the question would work:

That said, as of 4.3, collection/map and array types can be matched through Spring’s @Autowired type matching algorithm as well, as long as the element type information is preserved in @Bean return type signatures or collection inheritance hierarchies.

But with a lower Spring version, you can't autowire a collection like that. However, you can do the following:

@Resource(name="AdditionalParams")
private Map<String, String> additionalParams;

or even:

@Value("#{AdditionalParams}")
private Map<String, String> additionalParams;

Check the spring docs, the tips section:

beans that are themselves defined as a collection or map type cannot be injected through @Autowired, because type matching is not properly applicable to them. Use @Resource for such beans

Answer 3

@Autowired ApplicationContext ctx;
private  <T> T getBean(String qualifier, Class<T> returnType){
    //use this for loop to print all bean from ctx. so you wont miss the typo.
    /*for(String s:ctx.getBeanDefinitionNames())
        log.info(s);*/
    return ctx.getBean(qualifier, returnType);
}

// inside your call

 if(providerList == null){
       providerList = ctx.getBean("providerList", Map.class);
 }

This Solution works good to me