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Java

A collection of 38 issues

Spring Config To Disable CORS Issue In Spring Boot

We face CORS(Cross-origin resource sharing) issue specially when working with react or angular apps and running spring boot on different port, and front end app on some other to solve the CORS issue in spring boot is very easy and simple. to know Solve the issue we should know

Apache Drill:Running SQL Query from Spring Boot

This Article will help to you to set up Spring boot project and connect to apace drill through Jdbc driver and perform simple query. just for introduction sake Apache Drill is Apace drill is open source Implementation of Google's Dremel system used by Google BigQuery, Initially released on

File upload in spring boot Rest Controller

Spring boot is as an awesome framework where we could rapidly start our web development project with in minutes,java based configuration simplifies bootstrapping time where we could include third party library or other component into our applications. and to upload file in spring boot application is also made very

Multiple Data Source in Spring boot Using Spring boot data starter(HikariCP)

Most of us use Spring Boot to rapidly start the project by using its starter packages, one such package we use to connect persistent layer is spring boot data starter, and in most scenario just by adding the dependency is sufficient, but when we have multiple data source like MySQL,

Uses of java 8 lambda expressions in collections

Lambda expression facilitates functional programming, and simplifies the development a lot, Lambada provides the feature like sort of anonymous function which we use in the scripting language like PHP or Js which provide the inline implementation of the interface or generic operations which also avoid the need anonymous class Basic

JAVA TIP: Removing time and offset for date comparison on Date Object

This program helps to remove time append with date object. in certain scenarios we might have stored complete iso string or an timestamp which has time recorded. when we try to compare date using java equals function i.e someDate.equals(withsomeDate) we often end up in mess, so while

Spring Boot Native Query using entity manager and Custom result mapper

There are multiple methods to work on native queries in spring boot,like using Query annotation @ResultSet mapping annotation to map non entity Dtos, as query complexity increases code readability also decreases, i have preferred to use simple Solution and to map result to Dto for native query, for better

Custom Annotation To Handle Authorisation In Spring Boot AOP Tutorial

Overview: * Creating custom annotation * Creating component in spring boot * Creation a configuration and middleware in spring boot * Basic of Aspect and usage in spring boot What is Aspect In Spring Boot ? Aspects are cross cutting concerns like logging,security in different layers for the ease of code maintenance . Key Dependency