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Spring Jar giving null pointer exception

 
Ranch Hand
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I created a Jar using Spring and maven. I had dependencies injected and auto-wiring happening when I tested it using a main method in the same jar.

But I wanted to cross check if this jar can be used in a non-spring environment later. When I am using this jar's classes without any spring configuration. I tend to get null pointer exceptions for the places where dependencies/auto-wiring is expected to happen but it is not..... this is because though the jar is bundled it is not initialized in a spring-way.

Is it the case that jars created via spring are bound to be used in a spring-based environment later so that spring XML and auto-wiring/injection happen right for the created jar? ??
 
Rancher
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Well.. yeah!! Spring Core framework is injecting the dependencies for you. If you instantiate a bean outside of Spring, then you have to do the dependency inject yourself

So, for example:-



The following code will work fine



The following code will give Null pointer exception



If you want to use B without Spring's DI, you will have to do the DI yourself



 
Akhilesh Trivedi
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That is a pity then... if you got one of you component on Spring, you better want to get all of them on that side.!
 
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