How to pass java.util.Map instance as a parameter to a XSLTStylesheet

[Javalkar, Vishal]

Hi,

Apparently, Xalan (the one bundled with JDK 6 at-least) complains when a java.util.Map is passed as a parameter to an XSLT stylesheet.

Assuming, I have a snippet of code as:

Map inputparam = new HashMap();
inputparam.put("greeting", "hi there");
transformer.setParameter("inputparam", inputparam);
...
transformer.transform(...);

and I have a simple XSLT that attempts to get the key 'greeting' from this

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0"
        xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
        xmlns:map="xalan://java.util.HashMap"
        extension-element-prefixes="map">
       
        <xsl:param name="inputparam" />
       
        <xsl:template match="/">
                <xsl:variable name="greeting"
                        select="map:get($inputparam, 'greeting')" />
                <greeting><xsl:value-of select="greeting"/></greeting>
        </xsl:template>
</xsl:stylesheet>

I obtain the following error:

ERROR:  'Cannot find external method 'java.util.HashMap.get' (must be public).'
FATAL ERROR:  'Could not compile stylesheet'
javax.xml.transform.TransformerConfigurationException: Could not compile stylesheet
        at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTemplates(TransformerFactoryImpl.java:825)
        at com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTransformer(TransformerFactoryImpl.java:614)
        at xalanxslttest.ExecuteXslt.main(ExecuteXslt.java:36)


Is there a way to solve this? Is this supported?

All help/advice appreciated!
Thanks & Regards,
Vishal

[Santiago Pericas-Geertsen]

Vishal,

  Xalan in the JDK is a compiler (XSLTC) and as such it tries to  
resolve as much as it can statically. As a result, there are some  
limitations. The discussion and resolution in [1] may help.

-- Santiago

[1] http://issues.apache.org/jira/browse/XALANJ-1485

On Nov 2, 2009, at 7:21 AM, Javalkar, Vishal wrote:

> Hi,
>
> Apparently, Xalan (the one bundled with JDK 6 at-least) complains  
> when a java.util.Map is passed as a parameter to an XSLT stylesheet.
>
> Assuming, I have a snippet of code as:
>
> Map inputparam = new HashMap();
> inputparam.put("greeting", "hi there");
> transformer.setParameter("inputparam", inputparam);
> ...
> transformer.transform(...);
>
> and I have a simple XSLT that attempts to get the key 'greeting'  
> from this
>
> <?xml version="1.0" encoding="UTF-8"?>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
> xmlns:map="xalan://java.util.HashMap"
> extension-element-prefixes="map">
>
> <xsl:param name="inputparam" />
>
> <xsl:template match="/">
> <xsl:variable name="greeting"
> select="map:get($inputparam, 'greeting')" />
> <greeting><xsl:value-of select="greeting"/></greeting>
> </xsl:template>
> </xsl:stylesheet>
>
> I obtain the following error:
>
> ERROR:  'Cannot find external method 'java.util.HashMap.get' (must  
> be public).'
> FATAL ERROR:  'Could not compile stylesheet'
> javax.xml.transform.TransformerConfigurationException: Could not  
> compile stylesheet
> at  
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTemplates
> (TransformerFactoryImpl.java:825)
> at  
> com.sun.org.apache.xalan.internal.xsltc.trax.TransformerFactoryImpl.newTransformer
> (TransformerFactoryImpl.java:614)
> at xalanxslttest.ExecuteXslt.main(ExecuteXslt.java:36)
>
>
> Is there a way to solve this? Is this supported?
>
> All help/advice appreciated!
> Thanks & Regards,
> Vishal
>