Hi All, I got a strange error. A Code such: <xsl:variable name="dummy" select="StringBuffer:append($str1,'Test')"/> Crashes with java.lang.IllegalArgumentException: argument type mismatch java.lang.NullPointerException
It is quite surprising as I don't remember to change something (meaning java version). The error I obtained firstly in xalan2-4-1 and I could simulate it in xalan 2.7.0 and xalan 2.7.1 In the following are code samples from xalan 2.7.1 So, the start is jdk 1.6.0_03 (or 02 same results), I just downloaded a xalan-2.7.1-bin.zip and added the *.jar found there to a Java Project. A xsl Code such <?xml version="1.0" encoding="ISO-8859-1" ?> <xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform"; xmlns:StringBuffer="xalan://java.lang.StringBuffer" exclude-result-prefixes="StringBuffer"> <xsl:output method="xml" encoding="ISO-8859-1"/> <xsl:variable name="str1" select="StringBuffer:new()"/> <xsl:template match="/"> <xsl:variable name="dummy" select="StringBuffer:append($str1,'Test')"/> </xsl:template> </xsl:stylesheet> executed with a Xml Input (Code very similar with that from fop 0.20.5 ExampleXML2FO.convertXML2FO(File,File,File)) crashes on the line of StringBuffer:append() with java.lang.IllegalArgumentException: argument type mismatch and java.lang.NullPointerException Debugging the Problem, the Reason is the "bestMethod" chosen by org.apache.xalan.extensions.MethodResolver No idea why, the StringBuffer.append Method selected is one that has as bestParamTypes the following value: "interface java.lang.CharSequence" Then in convertParams(argsIn, argsOut, bestParamTypes, exprContext) and further in static Object convert(Object xsltObj, Class javaClass) there is the following Code: case XObject.CLASS_STRING: { if((javaClass == java.lang.String.class) || (javaClass == java.lang.Object.class)) return xobj.str(); else if(javaClass == Character.TYPE) { String str = xobj.str(); if(str.length() > 0) return new Character(str.charAt(0)); else return null; // ?? } else if(javaClass == Boolean.TYPE) return new Boolean(xobj.bool()); else { return convertDoubleToNumber(xobj.num(), javaClass); } } // break; Unreachable Well, in my case javaClass=="interface java.lang.CharSequence" so that the Code executes convertDoubleToNumber().... Finally one try to run StringBuffer.append() with a Double having NaN value... yeap... that lead to throwing Exceptions. Ok, a solution would be to add in first if a || javaClass == java.lang.CharSequence.class but my question is why exactly this problem occurred... Regards :) -- View this message in context: http://www.nabble.com/java.lang.StringBuffer-works-nomore-%28Java-6%29-java.lang.IllegalArgumentException-tp16897184p16897184.html Sent from the Xalan - J - Users mailing list archive at Nabble.com.
