What is Jar hell?
Jar hell or classpath hell or dependency hell is a term used to describe all the various ways in which the classloading process can end up not working. It ends with this list of the different circles of JAR hell: unexpressed dependencies, transitive dependencies shadowing, version conflicts, complex class loading.
Simple solution
Overwrite jar file in container by your libraries. Simply, copy your libraries to folder container/lib or some kind like that.
Several pitfalls may occur:
• We have to do it every freaking time we deploy the project.
• Depending on the container, we have to know how to do it properly.
• If we get the bad luck that the version we prefer to use is not compatible with the container, we may get more problem at runtime.
Use maven-shade-plugin
A better way is shading them. maven-shade-plugin provides the capability to package the artifact in an uber-jar, including its dependencies and to shade – i.e. rename – the packages of some of the dependencies.
How to do
For example, we have Google Guice lib is conflicting with Container
Step 1
Create a new maven project, for example guice-repacked
Step 2
