Xdk: calling java function with a CharSequence parameter

When using xdk version 10.1.0.2.0_production, you can not call a javamethod with a CharSequence parameter.
Sun documentation:
Interface CharSequence
All Known Implementing Classes:
CharBuffer, String, StringBuffer
This prevents us from calling a method like
java.util.regex.Pattern.matches(String, CharSequence)
Converting the parameter to a normal string would solve the problem.
Example to illustrate the issue:
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xdt="http://www.w3.org/2005/02/xpath-datatypes" xmlns:Pattern="http://www.oracle.com/XSL/Transform/java/java.util.regex.Pattern">
     <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>
<xsl:template match="/">
<xsl:if test="Pattern:matches('...','123')">
<xsl:text>MATCH</xsl:text>
</xsl:if>
</xsl:template>
</xsl:stylesheet>
results in the following stacktrace:
oracle.xml.parser.v2.XPathException: Extension function error: Error invoking 'matches':'java.lang.NullPointerException'
     at oracle.xml.parser.v2.XSLExtFunctions.callStaticMethod(XSLExtFunctions.java:113)
     at oracle.xml.parser.v2.XPathExtFunction.evaluateMethod(XPathExtFunction.java:296)
     at oracle.xml.parser.v2.XPathExtFunction.evaluate(XPathExtFunction.java:223)
     at oracle.xml.parser.v2.XSLCondition.testCondition(XSLCondition.java:185)
     at oracle.xml.parser.v2.XSLCondition.processAction(XSLCondition.java:165)
     at oracle.xml.parser.v2.XSLNode.processChildren(XSLNode.java:403)
     at oracle.xml.parser.v2.XSLTemplate.processAction(XSLTemplate.java:191)
     at oracle.xml.parser.v2.XSLStylesheet.execute(XSLStylesheet.java:507)
     at oracle.xml.parser.v2.XSLStylesheet.execute(XSLStylesheet.java:484)
     at oracle.xml.parser.v2.XSLProcessor.processXSL(XSLProcessor.java:256)
     at oracle.xml.parser.v2.XSLProcessor.processXSL(XSLProcessor.java:146)
     at oracle.xml.parser.v2.XSLProcessor.processXSL(XSLProcessor.java:218)
     at XSLSample.main(XSLSample.java:75)
Message was edited by:
user449717

Hi Grarup,
I took a stab at getting this to run and compile and this is what I came up with. Let me know if this helps at all.
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace ConsoleApplication1
class Program
static void Main(string[] args)
Console.WriteLine("\"True\" or \"False\"?");
bool boolVal = bool.Parse(Console.ReadLine());
Functions f = new Functions();
TestStruct t = new TestStruct() { Value = boolVal };
f.Flip(ref t);
Console.WriteLine(string.Format("Flipped value = {0}: ", t.Value));
Console.ReadLine();
public struct TestStruct
public bool Value;
public class Functions
public void Flip(ref TestStruct testStruct)
testStruct.Value = !testStruct.Value;
Best of luck.

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