java Archives - FavTuts

Spring Boot Microservices – Exposing repositories as REST resources

by FavTuts EditorialAugust 28, 2022August 28, 20220

For any application, it is an important functionality to be able to provide its data to the consumer. REST APIs are one of the most popular ways to do so. In this post, we will look at the process of exposing repositories as REST resources using Spring Boot. REST or Representational State Transfer is an architectural style that advocates the use of standard HTTP protocol to expose such an interface. And by the way, Spring Boot makes it very easy to do so.

Maven error – invalid target release: 17

by FavTuts EditorialJuly 23, 2022July 23, 20220

We upgraded the project from Java 11 to Java 17, and mvn test hits the Fatal error compiling: error: invalid target release: 17 . This article will show how to fix this Maven error.

Maven error – invalid target release: 1.11

by FavTuts EditorialJuly 23, 2022July 23, 20220

Maven compiles and hits the following fatal error messages: Fatal error compiling: error: invalid target release: 1.11 . The article will show you how to fix this error

A simple HttpSessionListener example – active sessions counter

by FavTuts EditorialJune 25, 2022June 25, 20220

Here’s a simple “HttpSessionListener” example to keep track the total number of active sessions in a web application. If you want to keep monitor your session’s create and remove behavior, then consider this listener.

The Java Archive Tool (JAR) Examples

by FavTuts EditorialJune 19, 2022June 20, 20220

Learn how to use JAR tool: 1 – Create a jar file, 2 – Update a jar file , 3 – Extract a jar file , 4 – List files from a jar file, 5 – Add manifest into jar file

How to add a manifest into a Jar file

by FavTuts EditorialJune 19, 2022June 19, 20220

In Java, you can use manifest file to define application’s entry point, adding classpath or package version for a JAR file. In this short tutorial , we will show you how to add a custom manifest file into a Jar file.

How to make a Java exe file or executable JAR file

by FavTuts EditorialJune 19, 2022June 20, 20220

In this tutorial, we will show you how to create a executable JAR – When you double click on it, it runs the defined main class in manifest file.

How to get the Tomcat home directory in Java

by FavTuts EditorialJune 19, 2022June 19, 20220

Is there a function in Java to retrieve the Tomcat (Catalina) home directory? Yes, Tomcat home directory or Catalina directory is stored at the Java System Property environment. If the Java web application is deployed into Tomcat web server, we can get the Tomcat directory with the following command: System.getProperty(“catalina.base”);

How to check JDK version that installed on your computer

by FavTuts EditorialJune 19, 2022June 19, 20220

The Java development kit (JDK) contains tools for Java development, and the Java Runtime Environment (JRE) contains a JVM to convert byte code .class to machine code, and execute it, in short, the JRE runs Java program. We can use javac -version to find out the version of the installed JDK. We can use java -version to find out the version of the installed JRE. The JDK and JRE versions can be different on the same computer. Multiple JDK and JRE versions are allowed on the same computer; it is better to find out which version is configured in the system classpath to run or compile the Java program.

How To Install Apache Tomcat 10 on Ubuntu 20.04

by FavTuts EditorialJune 18, 2022June 19, 20220

Apache Tomcat is a web server and servlet container that is used to serve Java applications. It’s an open source implementation of the Jakarta Servlet, Jakarta Server Pages, and other technologies of the Jakarta EE platform. In this tutorial, you’ll deploy Apache Tomcat 10 on Ubuntu 20.04. You will install Tomcat 10, set up users and roles, and navigate the admin user interface.

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