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CertificateException: Certificates does not conform to algorithm constraints

Java (JCE) is refusing to process a certificate because it violates configured algorithm constraints. This is most likely a certificate using md5WithRSAEncryption that are still quite common.

The algorithm constraints are defined in java.security file located somewhere in your JDK installation (e.g. /etc/java-8-openjdk/security/java.security for OpenJDK8 on Ubuntu). Change the following lines

to

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