I’d like to get a confirmation that: if two providers providing the same type of instance, one with qualifier and the other one without, would this work? For the following two cases, especially the TestClass1, will Dagger know which MetricsCollectorFactory to inject? Answer Yes, as on the Dagger dev guide, there are zero or one qualifier instances per key or
Tag: dependency-injection
Module in Module Dagger: This module is public, but it includes non-public (or effectively non-public) modules
I am using Dagger 2 for DI and want to inject one Module (module A) inside another one (module B). I am not including module A in any component or anywhere else. My code looks like this: I am getting the following error: I need ModuleB to be public because I am injecting it in a Component which is in
Spring:- What is the difference between ref attribute and ref tag?
I am pretty new to spring and have been learning from the official docs. I found that to inject a dependency using XML configuration, there are two ways to declare refs:- Or, I can use the ref tag, like:- Is there any difference between the two ref declarations? If not, why does spring allow two different methods? Thanks in advance.
How to create a Map<String, List> property in properties file that can be injectable using Spring’s @Value
How do I create a Map<String, List<String>> property in properties file that can be injectable using Spring’s @Value? Example code snippet in Properties java file Answer Here is the answer and the example code snippet in properties file: Reference: https://stackabuse.com/the-value-annotation-in-spring/ section –> Injecting into Maps
Spring Boot application.properties custom variable in a non-controller class
How come application.properties will work in a RestController, but not in a service class? Works Perfect! Returns “Null” Answer The inviteservice class is not configured for Spring IoC (Inversion of Control) as a bean, so Spring will not handle the inviteservice class lifecycle. In this case, @Autowired is useless. To fix this try to add @Component annotation to invitesevice, to
Spring autowiring dependency with constructor arguments
I have created a service class, TestService whose constructor takes an array of Strings and has a little logic to return a list of Strings with length greater than 5. How do I get about injecting this into my Controller class with the array of Strings argument? Answer I think it is impossible. Instead inject String[] testStrings holder: However, in
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{ I am new to unit testing and having troubles testing this function because when calling b.funcInClassB() it throws NullPointerException because b is null. I wrote the following test: Answer I figured it out:
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 POJO. FetcherA and FetcherB are two classes that depended on an Event instance to fetch their output, which means the output of FetcherA
Should I annotate pojo class with @Component?
I searched whether I should annotate POJO with @Component or not. It seems like it is recommended not to annotate pojo. Here is my OrderStatusMnemonic Configuration class that reads a txt file: OrderStatus POJO: Since I am autowiring OrderStatus POJO class I am getting error: Consider defining a bean of type ‘com.spectrum.sci.osm.orderstatus.OrderStatus’ in your configuration. Answer Your OrderStatus as it