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Node-set to XML string via Java extensions in Xalan-J: possible?

Node-set to XML string via Java extensions in Xalan-J: possible?

2007-02-22       - By Mike Brown
Reply:     1     2     3     4     5     6     7  

I'm trying to serialize nodes to an XML string, using Java extensions. I'm
trying to avoid writing my own. I thought perhaps I could use the
DOMSerializer in Xalan-J.

However, I'm having trouble calling certain methods. They're documented as
existing, but Xalan-J is not finding them. For example, I can instantiate an
OutputPropertiesFactory, but I can't call its getDefaultMethodProperties()
method. And I can't instantiate a SerializerFactory at all.



Here is my XML:

<?xml version="1.0" encoding="utf-8"?>
<greetings>
 <greeting xml:lang="en">hello!</greeting>
 <greeting xml:lang="es">&#161;hola!</greeting>
 <greeting xml:lang="fr">bonjour!</greeting>
 <greeting xml:lang="ru">&#1047;&#1076;&#1088;&#1072;&#1074;&#1089;&#1090;&
#1074;&#1091;&#1081;&#1090;&#1077;!</greeting>
 <greeting xml:lang="ja">&#20170;&#26085;&#12399;</greeting>
</greetings>


Here is my XSLT (the failure is when I try to create $formatprops):

<?xml version="1.0" encoding="utf-8"?>
<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:java="http://xml.apache.org/xalan/java">

 <xsl:output method="text" indent="no"/>

 <xsl:template match="/">
   <xsl:variable name="nodeset" select="/greetings"/>
   <!--OutputPropertiesFactory opropsfactory = new OutputPropertiesFactory();-
->
   <xsl:variable name="opropsfactory" select="java:org.apache.xml.serializer
.OutputPropertiesFactory.new()"/>
   <!--String method = org.apache.xml.serializer.Method.XML;
       Properties formatprops = opropsfactory.getDefaultMethodProperties
(method);-->
   <xsl:variable name="formatprops" select="java:getDefaultMethodProperties(
$opropsfactory, 'xml')"/>
   <!--SerializerFactory serializerfactory = new SerializerFactory();-->
   <xsl:variable name="serializerfactory" select="java:org.apache.xml
.serializer.SerializerFactory.new()"/>
  <!--Serializer serializer = serializerfactory.getSerializer(formatprops);-->
  <xsl:variable name="serializer" select="java:getSerializer($serializerfactory,
$formatprops)"/>
  <!--StringWriter buffer = new StringWriter();-->
  <xsl:variable name="buffer" select="java:java.io.StringWriter.new()"/>
  <!--serializer.setWriter(buffer);-->
  <xsl:variable name="void1" select="java:setWriter($serializer, $buffer)"/>
  <!--DOMSerializer domserializer = serializer.asDOMSerializer();-->
  <xsl:variable name="domserializer" select="java:asDOMSerializer($serializer)"/>
  <!--domserializer.serialize(node);-->
  <xsl:variable name="void2" select="java:serialize($domserializer, $nodeset)"/>
  <!--System.out.write(buffer.toString());-->
  <xsl:value-of select="java:toString($buffer)"/>
 </xsl:template>

</xsl:stylesheet>


Here is how I am invoking Xalan-J, and the error message:

C:\dev\test>java -Djava.endorsed.dirs=C:\dev\xalan-j_2_7_0 -cp C:\dev\xalan-j_2
_7_0\xalan.jar;C:\dev\xalan-j_2_7_0\serializer.jar org.apache.xalan.xslt.Process
-IN greetings.xml -XSL xalanserialize.xsl -EDUMP

; SystemID: file:///C:/dev/test/xalanserialize.xsl; Line#: 14; Column#: 103
javax.xml.transform.TransformerException: java.lang.NoSuchMethodException: For
extension function, could not find method org.apache.xml.serializer
.OutputPropertiesFactory.getDefaultMethodProperties([ExpressionContext,] #STRING
).
       at org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction
(ExtensionHandlerJavaPackage.java:420)
       at org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction
(ExtensionHandlerJavaPackage.java:438)
       at org.apache.xalan.extensions.ExtensionsTable.extFunction
(ExtensionsTable.java:220)
       at org.apache.xalan.transformer.TransformerImpl.extFunction
(TransformerImpl.java:473)
       at org.apache.xpath.functions.FuncExtFunction.execute(FuncExtFunction
.java:206)
       at org.apache.xpath.XPath.execute(XPath.java:335)
       at org.apache.xalan.templates.ElemVariable.getValue(ElemVariable.java
:278)
       at org.apache.xalan.templates.ElemVariable.execute(ElemVariable.java
:246)
       at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates
(TransformerImpl.java:2411)
       at org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode
(TransformerImpl.java:2281)
       at org.apache.xalan.transformer.TransformerImpl.transformNode
(TransformerImpl.java:1367)
       at org.apache.xalan.transformer.TransformerImpl.transform
(TransformerImpl.java:709)
       at org.apache.xalan.transformer.TransformerImpl.transform
(TransformerImpl.java:1284)
       at org.apache.xalan.transformer.TransformerImpl.transform
(TransformerImpl.java:1262)
       at org.apache.xalan.xslt.Process.main(Process.java:1046)
---------
java.lang.NoSuchMethodException: For extension function, could not find method
org.apache.xml.serializer.OutputPropertiesFactory.getDefaultMethodProperties(
[ExpressionContext,] #STRING).
       at org.apache.xalan.extensions.MethodResolver.getMethod(MethodResolver
.java:274)
       at org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction
(ExtensionHandlerJavaPackage.java:381)
       at org.apache.xalan.extensions.ExtensionHandlerJavaPackage.callFunction
(ExtensionHandlerJavaPackage.java:438)
       at org.apache.xalan.extensions.ExtensionsTable.extFunction
(ExtensionsTable.java:220)
       at org.apache.xalan.transformer.TransformerImpl.extFunction
(TransformerImpl.java:473)
       at org.apache.xpath.functions.FuncExtFunction.execute(FuncExtFunction
.java:206)
       at org.apache.xpath.XPath.execute(XPath.java:335)
       at org.apache.xalan.templates.ElemVariable.getValue(ElemVariable.java
:278)
       at org.apache.xalan.templates.ElemVariable.execute(ElemVariable.java
:246)
       at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates
(TransformerImpl.java:2411)
       at org.apache.xalan.transformer.TransformerImpl.applyTemplateToNode
(TransformerImpl.java:2281)
       at org.apache.xalan.transformer.TransformerImpl.transformNode
(TransformerImpl.java:1367)
       at org.apache.xalan.transformer.TransformerImpl.transform
(TransformerImpl.java:709)
       at org.apache.xalan.transformer.TransformerImpl.transform
(TransformerImpl.java:1284)
       at org.apache.xalan.transformer.TransformerImpl.transform
(TransformerImpl.java:1262)
       at org.apache.xalan.xslt.Process.main(Process.java:1046)
Exception in thread "main" java.lang.RuntimeException: java.lang
.NoSuchMethodException: For extension function, could not find method org.apache
.xml.serializer.OutputPropertiesFactory.getDefaultMethodProperties(
[ExpressionContext,] #STRING).
       at org.apache.xalan.xslt.Process.doExit(Process.java:1153)
       at org.apache.xalan.xslt.Process.main(Process.java:1126)


If I try to create the SerializerFactory first, I get a similar error about its
constructor
not being found. Am I doing something wrong?

Thanks,
Mike