Introduction In the tutorial, Spring NamedParameterJdbcTemplate and MapSqlParameterSource Example, I had shown how to save new record in the database and how to fetch record from database. Here I am going to show you how to mock Spring JdbcNamedParameterTemplate SqlParameterSource with Junit Mockito. I am going to use Junit 5 framework for this example. I…

Introduction Here in this example, I am going to show you how to create Spring Boot profile based logging. For any applications logging is an important things which will help you to debug through your application errors or issues and you can fix them easily by analyzing those errors or issues from the log files….

Introduction Apache POI is the most popular library when comes to manipulate word, excel, ppt based documents. In this example I am going to show you how to read large excel file using Apache POI library. Your large excel file may contain various kind of information, such as, Human Resource data, Sales data, Credit Cards,…

In this example you will see what are Predicate and Function functional interfaces in Java 8 or later version of Java. Functional interfaces provide target types for lambda expressions and method references. Each functional interface has a single abstract method, called functional method for that functional interface, to which the lambda expression’s parameter and return…

This example will show you what is a pangram and how to check a string is a pangram in Java program. A string is a pangram if it contains all letters or characters of alphabets (a to z or A to Z). A pangram or holoalphabetic sentence is a sentence using every letter of a…

Introduction The ELK Stack is made of three open-source products: 1) Elasticsearch, 2) Logstash, and 3) Kibana. Elasticsearch: It is a NoSQL database which is based on the open-source search engine called Lucene. So Elasticsearch is a search and analytics engine. Logstash: It is a data processing pipeline tool which accepts inputs from (multiple) sources,…

Here in this tutorial I will tell you what are Dynamic Tests and @TestFactory in Junit 5 and how to create @TestFactory in Junit 5. Test cases, annotated with @Test, are static in the sense that they are fully specified at compile time, and their behavior cannot be changed by anything happening at runtime. In…

Introduction Here in this tutorial I will show you an example on how to test private methods using Junit framework. I am using Junit 5 framework to test the private method. Using Mockito framework you won’t be able to test private methods, but using PowerMock core API you will be able to test the private…

In this example I am going to tell you how to map composite primary key to entity class in your JPA Hibernate entity class. Composite primary key is a combination of two or more columns made together as a primary key. Therefore the combination of column values will be as a unique instead of having…

In this example I am going to show you how to find all paths from root to leaf nodes in binary tree. So I am going to find each path from root to leaf node using Java program. A binary tree is a non-linear data structure type tree with at most two children for each…

Here I am going to show you how to find common, uncommon, unique elements in two Lists or ArrayLists using Java program. In this program I will show you how to find common, uncommon, unique string elements as well as object elements in two ArrayLists. For identifying the unique string elements is very straight forward…

Introduction In this tutorial I am going to show you how to create a custom immutable class in Java programming language. Immutable objects are those objects whose states cannot be changed. For example, you can change the state of an object by changing its attribute’s or field’s value. String is an example of the immutable…