XML Digital Signature throws NAMESPACE_ERR exception under OpenJDK 11 that works under Java SE 8, 9 and 10

Open eSignForms yozons at gmail.com
Tue Feb 12 23:28:03 UTC 2019

Thanks for the update, Sean.  I'm a bit perplexed because I found the 
original code works under Java 9 and Java 10, so it seems like the 
change occurred in Java 11.

I don't see the modified version of the test case.  If you attached it, 
it somehow didn't make it through to me.

If it's just a matter of making the code more correct, we'd love to make 
the changes.  My concern, of course, is that we've already done millions 
of XML digital signatures, so we need that to continue to verify 
correctly (and even under Java 11, it seems that the verify code works 
against previously digitally signed content) even if we now start 
digitally signing using more update-to-date code.

Please send over the modified test case and I'll take a look.


On 2/12/19 2:14 PM, Sean Mullan wrote:
> The bug is now at https://bugs.openjdk.java.net/browse/JDK-8218629
> I have started looking at this issue and have some progress I can report.
> In JDK 9, we updated the version of the Apache XML Signature 
> implementation in the JDK. Some of the marshalling code was rewritten 
> such that it will throw Exceptions if legacy DOM level 1 methods were 
> used to create XML content which is then passed into XMLObject and 
> similar XMLSignature types that take DOMStructure objects. This is 
> because the DOM level 1 methods do not support namespaces.
> I am still evaluating what the best fix is. However, you can 
> workaround the issue by always using DOM level 3 methods which are 
> namespace aware. For example, use Document.createElementNS instead of 
> Document.createElement and Element.createAttributeNS instead of 
> Element.createAttribute.
> Using legacy or non-namespace aware XML parsers or implementations is 
> not recommended and the XML Signature Best Practices document gives 
> some rationale: 
> https://www.w3.org/TR/xmldsig-bestpractices/#signing-xml-without-namespaces
> That said, this is a regression in behavior so it would be best if we 
> could restore the previous behavior.
> I have attached a modified version of the test case to the bug report 
> which no longer throws an Exception. Let me know if this is an 
> acceptable workaround. Double-check the namespaces that I used to make 
> sure they are correct.
> --Sean
> On 2/7/19 11:23 AM, Open eSignForms wrote:
>> On 2/7/19 7:49 AM, Sean Mullan wrote:
>>> On 2/6/19 4:51 PM, Open eSignForms wrote:
>>>> I have a test version of the code that can run standalone and shows 
>>>> the bug.  I'm not sure how best to transfer this information to the 
>>>> forum for those to play with, but it is included below.
>>> Thanks, I can reproduce the issue now. I will need to debug further 
>>> to see what might be causing this.
>>> --Sean

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