import jenkins.*
import jenkins.model.*
import hudson.*
import hudson.model.*
def jenkinsCredentials = com.cloudbees.plugins.credentials.CredentialsProvider.lookupCredentials(
    com.cloudbees.plugins.credentials.Credentials.class,
    Jenkins.instance,
    null,
    null
);

for (creds in jenkinsCredentials) {
    if (creds.id == "creds_id") {
        println "Class: ${creds.getClass().name}"
        println "\n--- Groovy properties ---"
        creds.properties.each { k, v ->
            println "${k} = ${v}"
        }
    }
}