[XALANJ-1016] Unknown error in XPath - ASF JIRA

Details

Type: Bug
Status: Resolved
Resolution: Fixed
Affects Version/s: 2.3Dx
Fix Version/s: None
Component/s: XPath
Labels:
None
Environment:
Operating System: Other
Platform: Other

Bugzilla Id:
9151

Description

javax.xml.transform.TransformerException: Unknown error in XPath
at org.apache.xpath.XPath.bool(XPath.java:411)

This error we get when evaluating <xsl:if test="$value!=''"> in
following stylesheet. This error happens randomly.
We

<xsl:template name="tg-val-attr-tbl">
<xsl:param name="tag"/>
<xsl:variable name="value">
<xsl:apply-templates select="." mode="tg-val">
<xsl:with-param name="tag" select="$tag" />
</xsl:apply-templates>
</xsl:variable>
<xsl:if test="$value!=''">
<xsl:attribute name="{$tag}">
<xsl:variable name="table"><xsl:call-template name="table-
name"/></xsl:variable>
<xsl:if test="$table!=''">
<xsl:value-of select="$table"/>
<xsl:text>.</xsl:text>
</xsl:if>
<xsl:value-of select="$value"/>
</xsl:attribute>
</xsl:if>
</xsl:template>

we use this code to invoke xalan:
public void generate(String xsl) {
TransformerFactory tf = TransformerFactory.newInstance();
try {
Transformer tr = tf.newTransformer(new
javax.xml.transform.stream.StreamSource(getClass().getClassLoader
().getResourceAsStream(xsl), getClass().getClassLoader().getResource
(xsl).toExternalForm()));
Object classes[] = this.classes.getSelectedValues();
java.io.StringWriter out = new java.io.StringWriter();
for(int i = 0; classes!=null && i<classes.length; ++i)

{ tr.clearParameters(); tr.setParameter("cls", name2id.get(classes[i])); tr.setParameter("root", this.root.getText()); System.out.println(" "+classes[i]); tr.transform(new javax.xml.transform.dom.DOMSource(doc, root.getText()+"/-"), new javax.xml.transform.stream.StreamResult(out)); }

System.out.println("Done! \n"+out);
} catch (TransformerConfigurationException e)

{ System.err.println(com.bs.exceptions.ExceptionHistory.getStackTrace (e)); }

catch (TransformerException e)

{ System.err.println ("Location: "+com.bs.exceptions.ExceptionHistory.getLocactionAsString(e)); System.err.println(com.bs.exceptions.ExceptionHistory.getStackTrace (e)); }

}

The stack trace:
Location: ; SystemID: file:/E:/DEVEL/bslib2/com/bs/generator/xmi_desc_gen.xsl;
Line#: 210; Column#: 29

; SystemID: file:/E:/DEVEL/bslib2/com/bs/generator/xmi_desc_gen.xsl; Line#:
210; Column#: 29

javax.xml.transform.TransformerException: Unknown error in XPath

at org.apache.xpath.XPath.bool(XPath.java:411)

at org.apache.xalan.templates.ElemIf.execute(ElemIf.java:198)

at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates
(TransformerImpl.java:2243)

at org.apache.xalan.templates.ElemTemplate.execute
(ElemTemplate.java:432)

at org.apache.xalan.templates.ElemCallTemplate.execute
(ElemCallTemplate.java:279)

at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates
(TransformerImpl.java:2243)

at org.apache.xalan.templates.ElemLiteralResult.execute
(ElemLiteralResult.java:710)

at org.apache.xalan.templates.ElemForEach.transformSelectedNodes
(ElemForEach.java:438)

at org.apache.xalan.templates.ElemForEach.execute(ElemForEach.java:299)

at org.apache.xalan.transformer.TransformerImpl.executeChildTemplates
(TransformerImpl.java:2243)

at org.apache.xalan.templates.ElemLiteralResult.execute
(ElemLiteralResult.java:710)

at org.apache.xalan.templates.ElemApplyTemplates.transformSelectedNodes
(ElemApplyTemplates.java:422)

at org.apache.xalan.templates.ElemApplyTemplates.execute
(ElemApplyTemplates.java:226)