• Post Reply Bookmark Topic Watch Topic
  • New Topic
programming forums Java Mobile Certification Databases Caching Books Engineering Micro Controllers OS Languages Paradigms IDEs Build Tools Frameworks Application Servers Open Source This Site Careers Other all forums
this forum made possible by our volunteer staff, including ...
Marshals:
  • Campbell Ritchie
  • Ron McLeod
  • Paul Clapham
  • Bear Bibeault
  • Junilu Lacar
Sheriffs:
  • Jeanne Boyarsky
  • Tim Cooke
  • Henry Wong
Saloon Keepers:
  • Tim Moores
  • Stephan van Hulst
  • Tim Holloway
  • salvin francis
  • Frits Walraven
Bartenders:
  • Scott Selikoff
  • Piet Souris
  • Carey Brown

@Autowired does not work with my SOAP handler class. Throws a nullPointerException?

 
Greenhorn
Posts: 1
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
This is my SOAP Handler class to generate security service handlers for a CRM. Everything was working fine as I hard coded my credentials - Username & Password. Now I tried to remove the hard-coding by defining the credentials in a properties file and autowiring it in this class. This method is not working and Spring throws a NullPointerExc (autowiring not happening I guess!) everytime I try to access my CRM. Why does @Autowired not work here while it works perfectly well my @Service, @Controller classes? Here is my code:



The "myCRM.userName" & "myCRM.password" is defined in my application.properties file. And the classPath of application.properties is defined in applicationContext.xml:



I've tried declaring the class as a bean in my applicationContext.xml; Declaring my class to spring as @Component + <component-scan...> in my xml;passing values explicitly using @Value; Still it doesn't work. Throws null pointer Exception everytime!

What is going wrong?



 
Bartender
Posts: 1682
7
Android Mac OS X IntelliJ IDE Spring Linux
  • Mark post as helpful
  • send pies
  • Quote
  • Report post to moderator
Try to use @Resource instead. You have to use this for Collections or Maps since Autowired has a different behavior for these.



Since this is a Properties and not a Collection or Map you can still use @Autowired but you will need to add a qualifier




More on the Spring docs

If you intend to express annotation-driven injection by name, do not primarily use @Autowired, even if is technically capable of referring to a bean name through @Qualifier values. Instead, use the JSR-250 @Resource annotation, which is semantically defined to identify a specific target component by its unique name, with the declared type being irrelevant for the matching process.

As a specific consequence of this semantic difference, 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, referring to the specific collection or map bean by unique name.

@Autowired applies to fields, constructors, and multi-argument methods, allowing for narrowing through qualifier annotations at the parameter level. By contrast, @Resource is supported only for fields and bean property setter methods with a single argument. As a consequence, stick with qualifiers if your injection target is a constructor or a multi-argument method.

 
Water proof donuts! Eat them while reading this tiny ad:
Thread Boost feature
https://coderanch.com/t/674455/Thread-Boost-feature
    Bookmark Topic Watch Topic
  • New Topic