Illegal XML characters in Java string lead to invalid XML

[David Balažic]

Hi!

Consider this web service implemented in Java:

@WebMethod(operationName = "test1")
@WebResult(name = "test1", targetNamespace = "http://test.example.org/")
public String test1()
{
return "foo\u0000bar"; // "foo" + NUL + "bar"
}

Using (versions 2.5.10 and 2.7.18 of) apache CXF, this will return to the
client (SOAP envelope omitted):

<ns2:test1>foo[NULL byte here]bar</ns2:test1>

Which is invalid XML. What is the correct standard handling of cases like
this?

Note: I did not test CXF 3.x as I requires changes to my dev environment(
newer version of various libraries).

I googled and found ... not much.
This is a related issue from Axis:
https://issues.apache.org/jira/browse/AXIS-2025 "Illegal XML characters in
String arguments and return values cause XML exceptions in Axis calls"

Note2: I posted this question here first:
https://stackoverflow.com/questions/53280783/how-to-handle-string-data-characters-that-are-illegal-in-xml

Regards,
David