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Posted to dev@xalan.apache.org by "Alex (JIRA)" <xa...@xml.apache.org> on 2007/03/20 19:58:32 UTC
[jira] Created: (XALANJ-2374) MethodResolver not handling
CharSequence class conversion
MethodResolver not handling CharSequence class conversion
---------------------------------------------------------
Key: XALANJ-2374
URL: https://issues.apache.org/jira/browse/XALANJ-2374
Project: XalanJ2
Issue Type: Bug
Environment: Windows Sun JRE 1.5.0.6 or higher
HPUnix JRE 1.5.0 or higher
Reporter: Alex
When using Java extensions with StringBuffer class, the MethodResolver picks a method whose argument types are not converted properly. This was noticed in the new versions of JVM due to the order at which they return all methods available for a given class. Since the MethodResolver scores the methods, the one with the lowest score wins. However, the method chosen is different depending on the order in which JVM returns the available methods. In the later versions, the StringBuffer.append(String) operation will actually find the StringBuffer.append(CharSequence) instead. This is ok but the "convert" method in the MethodResolver does not handle this type and therefore generates a "Double" type. This causes an "Argument Type Mismatch" exception when the "append" method is called. I have fixed the code by adding another "elseif" statement in the "convert" function (see the CharSequence section):
case XObject.CLASS_STRING:
{
if((javaClass == java.lang.String.class) ||
(javaClass == java.lang.Object.class))
return xobj.str();
else if(javaClass == java.lang.CharSequence.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);
}
}
The XSLT stylesheet that uses this code is the following:
<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0" xmlns:xalan="http://xml.apache.org/xalan" xmlns:lxslt="http://xml.apache.org/xslt" xmlns:my-ext="ext2" xmlns:java="http://xml.apache.org/xslt/java" exclude-result-prefixes="java" extension-element-prefixes="my-ext">
<xsl:template match="/">
<xsl:variable name="Destination" select="java:java.lang.StringBuffer.new('ABC')"/>
<xsl:variable name="Str" select="java:java.lang.String.new('DB')"/>
<xsl:variable name="b3" select="java:append($Destination,$Str)"/>
<output>
<xsl:value-of select="java:toString($Destination)"/>
</output>
</xsl:template>
</xsl:stylesheet>
If the code change is not made, the following exception results (again, this is only in the newer JVM versions as the older ones return the StringBuffer.append(String) before the StringBuffer.append(CharSequence) and thus the correct method is found:
javax.xml.transform.TransformerException: java.lang.IllegalArgumentException: argument type mismatch
at org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction(ExtensionHandlerJavaPackage.java:403)
at org.apache.xalan.extensions.ExtensionsTable.extFunction(ExtensionsTable.java:227)
at org.apache.xalan.transformer.TransformerImpl.extFunction(TransformerImpl.java:460)
at org.apache.xpath.functions.FuncExtFunction.execute(FuncExtFunction.java:196)
at org.apache.xpath.XPath.execute(XPath.java:308)
at org.apache.xalan.templates.ElemVariable.getValue(ElemVariable.java:323)
at org.apache.xalan.templates.ElemVariable.execute(ElemVariable.java:291)
at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2324)
at org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(TransformerImpl.java:2147)
at org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1203)
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:665)
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1119)
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1097)
at com.exln.stylus.CXalanDriver.doProcessing(CXalanDriver.java:108)
at com.exln.stylus.CProcessorDriver.process(CProcessorDriver.java:55)
Caused by: java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction(ExtensionHandlerJavaPackage.java:389)
... 14 more
---------
java.lang.IllegalArgumentException: argument type mismatch
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction(ExtensionHandlerJavaPackage.java:389)
at org.apache.xalan.extensions.ExtensionsTable.extFunction(ExtensionsTable.java:227)
at org.apache.xalan.transformer.TransformerImpl.extFunction(TransformerImpl.java:460)
at org.apache.xpath.functions.FuncExtFunction.execute(FuncExtFunction.java:196)
at org.apache.xpath.XPath.execute(XPath.java:308)
at org.apache.xalan.templates.ElemVariable.getValue(ElemVariable.java:323)
at org.apache.xalan.templates.ElemVariable.execute(ElemVariable.java:291)
at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates(TransformerImpl.java:2324)
at org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode(TransformerImpl.java:2147)
at org.apache.xalan.transformer.TransformerImpl.transformNode(TransformerImpl.java:1203)
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:665)
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1119)
at org.apache.xalan.transformer.TransformerImpl.transform(TransformerImpl.java:1097)
at com.exln.stylus.CXalanDriver.doProcessing(CXalanDriver.java:108)
at com.exln.stylus.CProcessorDriver.process(CProcessorDriver.java:55)
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