NullPointer when Injecting eclipse Services in e4

Quick version for the impatient: When starting an Eclipse RCP Application a Part in a plug-in throws a NullPointerException because the following lines did not seem to work, as partService seems to be …

Unit testing with inject annotation

How do I unit test a class that uses @inject annotation:class A{ @inject private B b; void foo(){ b.funcInClassB(); } I am new to unit testing and having troubles testing this function because …

using spring dependency injection for runtime generated dependencies

I am new to Spring and to better understand what I’m learning, I decide to integrate Spring into one of my projects. In the project, a collection of Events is generated at runtime, where Event is a …

Dagger Component has conflicting scopes

I am using Dagger and I have an app component with @Singleton scope and also a subcomponent with @Singleton scope. Now when I compile it I get this error: [io.droid.nowtellapp.dagger….

java.lang.NoClassDefFoundError: com/google/inject/Module using Guice

I am trying to use the DI mechanism provided by Google, but when I run my application, I am getting the following error: Exception in thread “main” java.lang.NoClassDefFoundError: com/google/inject/…

What exactly is Field Injection and how to avoid it?

I read in some posts about Spring MVC and Portlets that field injection is not recommended. As I understand it, field injection is when you inject a Bean with @Autowired like this: @Component public …

Guice: Injecting map binding with @Named

I would like to have the following injection model. Is this possible with Guice? Module: protected void configure() { MapBinder mapBinder = MapBinder.newMapBinder(binder()…

my Google Guice method interceptor doesn’t execute but Why?

So I am testing a simple Google Guice interceptor – My Annotation – @Retention(RetentionPolicy.RUNTIME) @Target(ElementType.METHOD) public @interface AppOpsOperation { } My Interceptor public …

using Spring JdbcTemplate – injecting datasource vs jdbcTemplate

As per Spring documentation, the steps to use Spring JdbcTemplate is as follows:

How does dependency injection work in Spring?

I want to know how spring does dependency injection. I want the low level logic used. Updates: I want to know how the object references are injected to the constructors or setter methods, is it …