Singleton is per classloader. so changes wont impact other instances loaded using other classloaders.
there are couple of good references:
Frage
If i have multiple instances of singleton class on different class loaders
and if i have modifications to a reference variable in any of these instances.
E.g if i add/remove an element to Hashmap
Does the change/modification impact the instances on other class loaders as well?
Lösung
Singleton is per classloader. so changes wont impact other instances loaded using other classloaders.
there are couple of good references:
Andere Tipps
Your "singleton" is one instance per JVM.
Here is a good article discussing classloaders, the relationship between different classloaders to each other, and to the JVM: