Introduction While developing spring-boot apps I have faced challenge of handling exception from service methods. Any exception that are propogated from the Controllers are handled by @ControllerAdvice. AFAIK there is nothing called as @ServiceAdvice to handle any exception being thrown from service layer. Spring tool …

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Complatable Future with RestTemplate In the previous article we learned how to use RestTemplate to call apis in sequence and compose their result and write to the client. We will try to optimize this now by makeing these 2 request work in parallel and return this response. We will same UserProfileSupplier & …

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Use case RestTemplate is a synchronous web-client to perform http/s requests from spring applications. Configuration We first define the bean to be injected in our services using following config: 1@Configuration 2public class Config { 3 4 @Bean 5 public RestTemplate restTemplate() { 6 return new RestTemplate(); 7 } 8 …

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Logging ndjson to a file We will configure spring-boot application to redirect logs to a file in ndjson format. See more information on ndjson Dependencies Add following dependencies to the pom.xml 1 <dependency> 2 <groupId>ch.qos.logback.contrib</groupId> 3 <artifactId>logback-json-classic</artifactId> 4 …

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Web app background After writting backend application which no face to showcase or few personal projects which i started but never completed because of lack of ui(infact i do not like html & css at all). Have learned it before time caused me to show less interest during actual projects. But everyday a new ui and js …

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Among other numerous jwt advantages, I prefer one more crucial jwt advantage of generating and validating it before hand and avoid the need to store it in database. Storing it in database also can be helpful but that is later topic of discussion. We store credentials of user in database using Bcrypt password hashing …

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Let's load dataset into postgres. Run postgres docker container 1docker run -d --name postgres-shared-buff-default -e POSTGRES_PASSWORD=ungabunga postgres If you use tools like pgadmin, please follow this link to import csv data into database. Let's see how many rows we have using count query. 1select count(id) from …

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Hello Everyone, now that we know how to use logstash from Post 1 and Post 2. This time we will load world cities data apply a few filters, transform it and store results in elastic search to analyze it. ELK Download 1wget https://artifacts.elastic.co/downloads/logstash/logstash-[version-os-arch].tar.gz 2wget …

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"Human beings are always in a state of motion, interacting with their environment while sending out and receiving information from the things around them. Typically, these conversations aren’t synchronous, linear, or narrowly defined to a request-response model. It’s something more like a message-driven, where we’re …

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Previosuly, we have learnt what is logstash and how to use it with basic standard input example and file as an output with a mutate filter to transform input message to upper cases. In this i will try to explain how we can use inbuilt plugin to stream data from services like twitter and store it into elastic search. …

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