Error about invalid XML characters on Java

Unicode character 0x0 represents NULL meaning that the data you're pulling contains a NULL somewhere (which is not allowed in XML and hence your error).

Make sure that you find out what causes the NULL in the first place.

Also, how are you interacting with the WebService? If you're using Axis, make sure that the WSDL has some encoding specified for data in and out.

fixed with this code:

String cleanXMLString = null;Pattern pattern = null;Matcher matcher = null;pattern = Pattern.compile("[\\000]*");matcher = pattern.matcher(dirtyXMLString);if (matcher.find()) {   cleanXMLString = matcher.replaceAll("");}

This is an encoding issue. Either you read it the inputstream as UTF8 and it isn't or the other way around.

You should specify the encoding explicitly when you read the content. E.g. via

new InputStreamReader(getInputStream(), "UTF-8")

Another problem could be the tomcat. Try to add URIEncoding="UTF-8" in your tomcat’s connector settings in the server.xml file. Because:

It turned out that the JSP specification says that if the page encoding of the JSP pages is not explicitely declared, then ISO-8859-1 should be used (!).

Taken from here.