Tomcat Maven Plugin Example
In this maven tutorial, learn to add and configure tomcat plugin to pom.xml and use it deploy the web application without any tomcat installation in machine.
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Lokesh Gupta
Website: https://howtodoinjava.com
Github: https://github.com/lokeshgupta1981/
Twitter: @HowToDoInJAVA
My Articles:
Spring @GetMapping and @PostMapping
Learn to create Spring MVC controllers and map requests with request mapping annotations e.g. @RequestMapping, @GetMapping, @PostMapping, @PutMapping, @DeleteMapping and @PatchMapping.
Spring DispatcherServlet – How does it work?
In this tutorial, we will learn about Spring’s DispatcherServlet class, it’s responsibilities and how to configure it with examples.
Spring MVC and Hibernate CRUD Example
In Spring MVC and Hibernate configuration example, learn to create form-based CRUD application that validates and persists data into database.
Stream of Random Numbers in Java
Learn to get the Stream of random numbers in Java using the Random and SecureRandom methods ints(), longs() and doubles().
Finding Max and Min from List using Streams
Learn to find min and max date, number, Char, String or object from a stream of items in easy steps using Comparator.comparing().
Get HttpServletRequest Body Multiple Times
My requirement was to read the HTTP request body 2 times in servlet filter and the pass the request to filter chain. HttpServletRequestWrapper helped me.
Java Stream count() Matches with filter()
To count the number of elements in stream in Java 8, use either the Stream.count() or Collectors.counting() methods.
Collecting Stream of Primitives into Collection or Array
To convert primitives intstream or longstream to List, Set or Array, you can adapt one of the following ways given with examples.
Boxed Streams in Java
In java 8, to convert a stream of primitives to collection, you must first box the elements in their wrapper class and then collect them i.e. boxed stream.
Spring 5 New Features and Upgrades
Spring 5 is the first major release, almost four years after Spring Framework 4.0. Lets quickly go through some exciting features coming in Spring 5.0.
Java 9 Features and Enhancements
Java 9 is bringing lots of new enhancements which are going to affect your programming style and habit, in big way. The biggest change is the modularization of Java. It’s another big change after Lambdas in Java 8. In this article, I am listing down changes which will be part …
Java Platform Module System – JPMS Tutorial
JPMS (Java Platform Module System) is the major enhancement in Java 9. It is also known as Project Jigsaw. In this Java 9 modules tutorial, we will learn about modules (in general) and how your programming style will change in future when you will start writing modular code.
Java 9 – JShell
JShell allows us to execute Java code snippets and get immediate results without having to create a solution or project or using any code editor.
Get all Dates between Two Dates as Stream
Date and time handling has always been a pain area for Java developers. The new Date-Time API added in Java 8 changed the way, we interact with date and time in Java. New Date API is a very powerful and much-needed improvement. The only thing missing was, getting a stream …
Java Stream takeWhile, dropWhile, iterate, ofNullable
Learn new Java 9 improvements in Stream API, i.e., the takeWhile / dropWhile, ofNullable, and iterate methods with examples.
Immutable Collections with Factory Methods in Java 9
Learn to create immutable collections such as immutable list, immutable set and immutable map using new factory methods in Java 9.
Private Methods in Interface – Java 9
Java 9 onward, you are allowed to include private methods in interfaces. Using private methods, now encapsulation is possible in interfaces as well. In this java 9 tutorial, we will learn about interface private methods in detail. Table of Contents Interfaces till Java 7 Static and defaults methods since Java …
Adding Role Based Security with Spring Boot REST APIs
Learn to create JAX-RS 2.0 REST APIs using Spring Boot and Jersey framework, and add role based security using JAX-RS annotations e.g. @PermitAll, @RolesAllowed or @DenyAll. Table of Contents Project Structure Create REST APIs Secure REST APIs with JAX-RS Annotations Write security filter using JAX-RS ContainerRequestFilter Demo Project Structure The …
Create Jersey REST APIs with Spring Boot
Learn to configure and create JAX-RS 2.0 REST APIs using Spring Boot and Jersey framework. This example application uses Jersey’s ServletContainer to deploy the REST APIs.
Spring Boot JMSTemplate with Embedded ActiveMQ
Learn to configure Spring boot application with embedded ActiveMQ for sending and receiving JMS messages with help of JMSTemplate.
How to Install Python Packages in Sublime Text
Learn to install python package in sublime editor for features like autocomplete and run build within sublime editor itself.
Java Static – Variable, Method, Block, Class and Import Statement
Static keyword in java can be applied on variables, methods, blocks, import and inner classes. Learn the effect of using static keyword in detail.
Java Constructor Example: Default and Parameterized
Java constructors are special method-like constructs that allow fully initializing the object state before other classes can use it.
Java Inheritance
Java Inheritance refers to the ability of a child class to inherit all the non-private properties and methods from the parent class.
Lucene RAMDirectory Example
In this Lucene 6 tutorial, we will learn to use RAMDirectory to run quick examples of POCs because it is not intended to work with huge indexes.
Lucene Wildcard Query Search Example
In Lucene, WildcardQuery can be used to execute wildcard based searches on lucene indexes. Learn to use WildcardQuery with example.
Lucene UnifiedHighlighter Example
Lucene UnifiedHighlighter is the highest-performing highlighter, especially for large documents. Tutorial to highlight search terms in indexed documents/files.
Lucene Search Highlight Example
In Lucene highlighter example, learn to search in documents and highlight search terms in search results using SimpleHTMLFormatter and Fragmenter.
Lucene: Index and Search Unstructured Text Files
In Lucene 9 example, learn to create indexes from unstructured text files and then search tokens within indexed documents with respective scores of documents.
Java Regex as Predicate using Pattern.compile() Method
Learn to compile regular expression into java.util.function.Predicate. This can be useful when you want to perform some operation on matched tokens.
Lucene Tutorial: Getting Started (with Examples)
Learn to use Lucene 6 to create, index and search documents using code examples to read, write lucene documents and performing search over them.
JSON.simple – Read and Write JSON
JSON.simple is lightweight JSON processing library which can be used to read JSON, write JSON file. Produced JSON will be in full compliance with JSON specification (RFC4627).
Read XML with JDOM2 Parser in Java
JDOM parser can be used to read XML, parse xml and write XML file after updating content of it. It stores JDOM2 document in memory to read xml values.
Java Read File to String (with Examples)
Learn to read a text file into String using Files.readAllBytes(), Files.lines() and BufferedReader classes in various ways.
Java remove non-printable non-ascii characters using regex
Java example to use regular expressions to search and replace unwanted and non-printable characters ASCII characters from text file content.
Java 8 Method Reference (with Examples)
Since Java 8, in simplest words, the method references are a way to refer to methods or constructors without invoking them. Learn the syntax with examples.
Convert Byte[] to String and Vice-versa
Learn to convert byte[] to String and String to byte[] in java – with examples. Conversion between byte array and string may be used in many cases including IO operations, generate secure hashes etc.
Convert String to int in Java
learned to parse a string (decimal, octal and hexadecimal) to int or Integer types using Integer.parseInt(), valueOf() and decode() methods.
Java Enum with Strings
In this guide to Java enum with string values, learn to create enum using strings, iterate over all enum values, get enum value and to perform reverse lookup to find enum by string parameter.
Split CSV String using Regex in Java
Learn to split string by comma or space and store in array or arraylist. Use given Java program to convert string to List in Java.
Java Custom Serialization using readObject() and writeObject()
We may need custom serialization in java in many cases. For example, we have legacy java classes that we are not willing to modify for any reason. There can be some design constraints as well. Or even simply, the class is expected to be changed in future releases which could …
RxJava Tutorial
RxJava 2.0 is open source extension to java for asynchronous programming by NetFlix. It is much closer to functional programming as seen in java 8 lambda expressions. The basic building blocks of reactive code are Observables and Subscribers. An Observable emits items; a Subscriber consumes those items.
Maven Parent and Child POM Example
Maven parent POM (or super POM) is used to structure the project to avoid redundancies or duplicate configurations using inheritance between pom files.
Maven Scopes: Compile, Provided, Runtime, Test, Import, System
Maven dependency scope is used to specify the visibility of a dependency. It provides six scopes i.e. compile, provided, runtime, test, system, and import.
Maven – Local, Remote and Central Repositories
Maven repositories are physical directories that contain packaged JAR files along with extra metadata. Learn about local, remote and central repositories.
Maven Dependency Management
In this Maven tutorial, learn about Maven dependency management, including external dependency, transitive dependency tree, excluding dependencies and version ranges. 1. What is Maven Dependency? In Maven, a dependency is just another archive—JAR, ZIP, and so on—which our current project needs in order to compile, build, test, and/or run. These project dependencies are collectively specified in …
Maven – POM File
POM (Project Object Model) is an XML file that contains information about the project and configuration details used by Maven to build the project i.e. sourcecode location, project dependencies etc. This file must be named as pom.xml and placed under root folder of project.
Maven – Settings File
Maven settings.xml file contains configurations that are not specific to a project, but are global in nature. It also contains information that is not meant to be distributed (e.g. passwords).
Difference between JUnit 5 an JUnit 4
JUnit 5 aims to adapt java 8 style of coding and to be more robust and flexible than JUnit 4. In this post, JUnit 5 vs JUnit 4, we will focus on some major differences between them.