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
Tag: spring
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…
How is the best way to extract a section from word document with Apache poi?
I´m using Apache poi (XWPF) with Springboot in java 11. I need to extract the section number 2 (title and content) from a word document with the follow numerated list: word_example I would like to know what is the best way to get only section 2 and its content to create a new word document with only that part…
HiveMQ Java library fails to automatically reconnect to broker
I’m using the HiveMQ library in my Java Spring application to connect to a Mosquitto instance as I find it more user-friendly compared to the Paho client. But something is going wrong with the automatic reconnection. From time to time the connection is lost and the application doesn’t succeed in r…
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 …
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…
How I can turn on and off BlockHound check
I have some App with WebFlux and i want to use BlockHound, but i need to have a possible turn on and off it through parameter in application.properties or through spring profiling or somthing else. Also I want to override action, when the lock operation is caught so that not throw error but log warning. And f…
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 defaul…
Handle daylight savings time and representing UTC in Date object
I have a function which returns the current UTC time in Date object, simple. What we do is find current Instant of UTC, put it in Date object and return. Note: Local Host time here is New York/America. The problem we are now facing is that Date refuses to store March 13 2:02 AM, since the time doesn’t e…