In Java, we know class loader is a JVM system which loads the classes into JVM for executiion. When I run a simple Java class , it is getting loaded and executed by the run time system. Here I am not doing anything with respect to the class loading. But I can see, there are various projects in which they are writing a custom class loader or enhancing the existing class loaders . Please let me know the production time use case where class loader enhancement or new class loader is required.
1 Answers
The few use case that I can think of right now:
You can use custom classloader to replace implementation during runtime (i.e without restarting server). It is being used heavily by JRebel
https://www.jrebel.com/blog/how-to-reload-java-classes-at-runtimeTomcat uses classloader to separate different webapps object scope at runtime.
How Tomcat Classloader separates different Webapps object scope in same JVM?OSGI uses classloader to load bundles.
Java classloader usage in OSGi
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