Illegal XML characters in String arguments and return values cause XML
exceptions in Axis calls
-----------------------------------------------------------------------------------------------
Key: AXIS-2025
URL: http://issues.apache.org/jira/browse/AXIS-2025
Project: Axis
Type: Bug
Components: Serialization/Deserialization
Versions: 1.2
Environment: All (but reproduced on WinXP).
Axis 1.1 and 1.2
Reporter: Shankar Unni
Arguments and return values of Java type String are incorrectly handled if they
contain non-printing illegal ASCII characters.
Example 1: bad return values:
- - - - - - - - - - - - - - -
E.g. the string
"bad char: " + (char)3 + "."
Trivial example:
foo.jws:
public class foo {
public String badmsg()
{
return "bad: " + (char)3 + ".";
}
}
When calling this method and the server is running on Axis 1.1, it returns XML
with the illegal character ASCII "3" in the text:
<badmsgReturn xsi:type="xsd:string">bad: .</badmsgReturn>
This causes an XML parse exception on the client side
("org.xml.sax.SAXParseException: An invalid XML character (Unicode: 0x3) was
found in the element content of the document.")
With Axis 1.2, the server doesn't even return a valid response: I get an HTTP
200 OK with an empty content, causing a different XML parse error.
Example 2: bad parameter values:
- - - - - - - - - - - - - - - -
A similar problem exists when passing such a string from the the client side.
If I have a method in foo.jws:
public class foo {
public String echo(String s)
{
return s;
}
}
Then if I write an ordinary Java client to call this, and pass it a bad string
as in the beginning of this post, I get an exception thrown while the call is
being composed:
java.lang.IllegalArgumentException: The char '0x3' in 'bad char: ♥.' is not a
valid XML character.
This is somewhat absurd: shouldn't the serialization layer be encoding these
illegal XML characters as entity escapes? They're entirely legal in the current
locale (US), and normal Java code handles this character quite normally. Why
should it croak when passed by XML/RPC?
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