refer https://issues.shibboleth.net/jira/browse/osj-152

opensaml v2 version uses xmltooling.jar .

opensaml v3 version uses opensaml-soap-impl.jar which has different package name compared to xmltooling.jar

example:

opensaml-soap-impl.jar uses --> org.opensaml.core.xml.xmlobjectbuilder

xmltooling.jar uses --> org.opensaml.xml.xmlobjectbuilder

root causue: your classpath has both v2 and v3 versions of opensaml . this is reason for classcast exception.

solution:

ideally you don't need to have both versions of opensaml . it might happen accidentally due to maven dependency management. remove one of them.

if your code base compatible with opensamlv2 version and if you don't want to upgrade, please exclude opesamlv3 jars as below.

otherwise upgrade your codebase to compatible with v3 version and remove opensamlv2 related jars

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