xpath string as parameter from java

Hello at all!!
I need a method to pass a string as an XPATH query to a xsl file.
The String XPstr represent an XPATH query that selects some xml node and it must be passed to xsl by a *JAVA* application.
I've used node-set() common function but I've encountered some problems: it isn't seen as a "query string" and 
no node(s) are selected by the selection!

Java code (used as example: the string XPstr passed as parameter depends on some user's settings and change each time):
public static void main(String[] args) throws Exception {
      ....
       TransformerFactory factory = TransformerFactory.newInstance();
       Transformer transformer = factory.newTransformer(new StreamSource("theXSLFile"));
       StreamSource xmlsource = new StreamSource("theXMLFile");
       StreamResult output = new StreamResult(System.out);
       *transformer.setParameter("XPstr","/HostGroupInfo//Process[@ProcStatus='OFF']");*
       transformer.transform(xmlsource, output);
}

*The xsl code:
*
<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:exsl="http://exslt.org/common" 
                           extension-element-prefixes="exsl">
        <xsl:import href="templates.xsl"/>
        *<xsl:variable name="XPstr"/>*
        <xsl:template match="/">
                <br>_________________________________________________________________________</br>
                <xsl:for-each select="*exsl:node-set($XPstr)*">
                        <xsl:apply-templates select="ancestor-or-self::*"/>
                        <br>_________________________________________________________________________</br>
                </xsl:for-each>
        </xsl:template>
        <xsl:template match="*">
                <xsl:apply-imports/>
        </xsl:template>
</xsl:stylesheet>



The XMl File (fragment):

<HostGroupInfo Group="LNL-2">
    <HostData Status="1">
        <HostName>lnl</HostName>
        <UpTime>2848422</UpTime>
        <Roles>
            <Role Status="1">
                <RoleName>wr-node</RoleName>
                <Processes>
                    <Process Active="1" ProcStatus="OFF">
                        <ProcName>ntpd</ProcName>
                        <NumberOfIstances>1</NumberOfIstances>
                    </Process>
                    <Process Active="1" ProcStatus="S">
                        <ProcName>sbatchd</ProcName>
                        <NumberOfIstances>1</NumberOfIstances>
                    </Process>
                    ....
                </Processes>
            </Role>
        </Roles>
    </HostData>
    <HostData Status="1">
        <HostName>msf</HostName>
        <UpTime>78941</UpTime>
        <Roles>
            <Role Status="1">
                <RoleName>wnode</RoleName>
                <Processes>
                    <Process Active="1" ProcStatus="S">
                        ...
                    </Process>
                </Processes>
            </Role>
        </Roles>
    </HostData>
</HostGroupInfo>

Could anyone help me, please?
Thank you very much.
Nat

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