I created a interface which has not any implementations Can MyInterface be annotated by @Autowired? following error displayed when it run Answer No you can’t, because Spring tries to instantiate it to create a Bean (@Service), but it’s an Interface, so thats not possible.
Tag: spring-boot
How do I write a test for a service that uses other services in Springboot?
I have a BookManagementService that uses the @Autowired implementation of three other services, like so So how do I mock the aforementioned services and their repo in the BookManagementServiceTest? When the test start running and it gets to the yearService layer, it throws a NullPointerEXception cause the year it receives is null The BookManagementServiceTest Answer You just have to mock
How to control fields.hasErrors() and bindingResult manually
I’m trying to check if I have a List with items. So I use this code in my HTML Normally I should add @NonEmpty label in the form and let Spring work automatically. In my case, I can’t do it this way and I need to add the error manually. So I do this in my controller: But the message
What is the difference between PropertyEditor, Formatter and Converter in Spring?
Working with Spring MVC it turns out that I can bind my forms in many different ways and I really feel like I’m getting lost. The parse and print methods of a Formatter are equivalent to those of a PropertyEditorSupport with a different name (getAsText and setAsText). Similarly, I can implement either a GenericConverter or two Converter<S,T>s to do exactly
Direct Buffer Memory error when connecting mqtt
we are running an Apache Beam Apllication on a Flink Cluster. Since a few days the application fails with the following error: The connection is build up with the following method: But it runs on my machine When I start the application from my eclipse project all works fine. So the error only happen in the Flink Cluster which makes
failed to convert java.lang.String to com.fasterxml.jackson.databind.MapperFeature
application.properties how can i resolve this error please help !! Answer You appear to have a typo in the name of the Jackson mapper property: It should be “inclusion”, not “inclusions”:
Spring boot – Snowflake JDBC – Alter session automatically when application loads
I’m trying to connect Snowflake to Spring boot based application. Everything works well however due to some crazy defaults in snowflake, I’m having to deal with the below error: https://community.snowflake.com/s/article/SAP-BW-Java-lang-NoClassDefFoundError-for-Apache-arrow I can fire the queries via Spring data JPA but not able to map the results at all. The solution asks for changing the default resultset format from ARROW to
Maven: library module
I’m working on a project with a library module that has about 10 submodules. For the application project the developer asked us to find a way so that they can import only one dependency, instead of the requested 10. Let’s use as an example the dependency of log4j: I need only to include one not all the sub-dependencies. How can
Getting Exceptions while running a Spring boot app with elasticsearch
I was following this tutorial: https://www.youtube.com/watch?v=IiZZAu2Qtp0&ab_channel=LiliumCode and the only changes I made were that I was using maven with eclipse instead. The rest of the code is exactly the same. When I run the app I get: My elasticsearch.yml: I have tried out searching the exceptions online but nothing seems to work. Please help me in figuring this out. Thank
Mapstruct how to initialize fields
I have a DTO like this and an entity I want to create a mapper to map DTO to entity. How can I make the field private Instant timestamp; has value like Instant.now()? My mapper so far It got compile error Answer The issue is due to the source being empty. Remove the source and use expression instead of defaultExpression.