NullPointerException using STS, Trust and entropy

Actually NullPointerException comes from Rahas STSClient->createIssueRequest:

this.requestorEntropy =
                            WSSecurityUtil.generateNonce(this.algorithmSuite.
                                    getMaximumSymmetricKeyLength()/8);

this.algorithmSuite is always null. You can see from stack trace that this STSClient instance is created in RampartUtil->getToken and there is no place where algorithmSuite can be set.