I did a new test with a very simple SAML assertion that I found when I was Google (do not know if it is 100% valid). However, I get the same error:
Wed Jan 28 11:41:42 CET 2009:ERROR:java.lang.NumberFormatException: For input string: ""
java.lang.NumberFormatException: For input string: ""
at java.lang.NumberFormatException.forInputString(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at java.lang.Integer.parseInt(Unknown Source)
at org.opensaml.SAMLAssertion.fromDOM(Unknown Source)
at org.opensaml.SAMLAssertion.(Unknown Source)
at com.eviware.soapui.impl.wsdl.support.wss.entries.AddSAMLEntry.process(AddSAMLEntry.java:91)
So, is it a problem with SAML 2.0?