Hi Juan,

You are using an old version of CAS, your best bet is to upgrade to a more 
recent version. You can check the latest CAS release 
here: https://github.com/apereo/cas/releases
To minimized the change needed, use 5.3.7 would be Ok. 6.0.0 is better but 
you would need to change a fair bit in your enviornment (at least need to 
change to JDK11).

As for actually why this (i.e. ConcurrentModificationException) happen, I 
have search in the CAS PR and found the 
below: https://github.com/apereo/cas/pull/2649.
If your problem is the same as the above, then maybe your problem exists in 
5.1.x and is fixed in 5.2.x?

Anyway, see if the above helps you!

Cheers!
- Andy


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