Issue

When setting up Single Sign-On (SSO) for an application with the SAML module, an issue might occur where it is not possible to start the application, and the following error may be found in the logs:

[APP/PROC/WEB/0] CRITICAL - ActionManager: Error in execution of monitored action '{"name":"SAML20.Startup","type":"Microflow"}' (execution id: 72125568-6eaa-4e06-8307-6f26393d8259, execution type: CUSTOM)
[APP/PROC/WEB/0] java.lang.NoSuchMethodError: 'org.bouncycastle.asn1.DERBitString org.bouncycastle.asn1.x509.SubjectPublicKeyInfo.getPublicKeyData()'

Environment

SAML module (all versions)

Applications hosted in any deployment type

Cause

The error above suggests that there are conflicting JAR libraries specifically relating to the SAML module. The error is being thrown because the DERBiString class may be found in multiple libraries.

Solution/Workaround

To fix this issue and remove the error, it is necessary to clear the userlib folder of duplicate libraries. The steps for this can be found in Clean Userlib folder. 

Additional information 

Mendix documentation: SAML

Related KBA: Clean Userlib folder