How to download a file from URL in java
Often it is required to download a file directly from a URL to a local system such as downloading a file from a remote repository. This requires reading a file…
How to get java version programatically
Why java version at runtime Sometimes you need to execute some code conditionally based on the current executing java version. For example, there is some functionality whose code was different…
How to find size of directory in linux / du command tutorial in linux
Determining the size of a directory or its sub-directories is often required for the purpose of monitoring such as a folder which is taking space above some limit. du command…
How to change default ports in wildfly
Every server runs at some pre-defined default ports. But you can also change the default setting so that the server listens at the configured port number. Default ports of Wildfly…
java.lang.UnsupportedClassVersionerror and its solution
Almost every java developer would have encountered the below error sometime or the other while executing a java program. Exception in thread "main" java.lang.UnsupportedClassVersionError: com/codippa/HelloWorld has been compiled by a…
How to find out the jdk version which compiled a class in java
You can easily determine the jdk version with which a given java file was compiled using the below command. javap --verbose <class file name> The above command should be executed…
How to check java version on different operating systems
Many times we need to check the version of java installed on the system due to the following reasons Check if java is installed even or not. Know if the…
How to change context path of web application in JBoss / Wildfly
What is context path in a web application Context path, also called context root is the name with which a web application is accessed in the browser. It is the…
How to deploy war file in tomcat
What is a WAR file A WAR file stands for Web Application Archive and is a bundle for distributing or hosting a java web application. It is used as a…