Parsing Error

[yekkala krishna]

Hi,
I am not able to parse xml using xpath i am getting following exception.could you please what i need to do to solve this exception.

//exception:
javax.xml.transform.TransformerException: Empty expression!
        at com.sun.org.apache.xpath.internal.compiler.XPathParser.error(Unknown Source)
        at com.sun.org.apache.xpath.internal.compiler.Lexer.tokenize(Unknown Source)

			XPathFactory xpf = XPathFactory.newInstance();
			XPath xPath = xpf.newXPath();
			String xpPersp = "//perspective[@id='" + id + "']"; // Construct base xpath expression
			String dispName = xPath.evaluate(xpPersp + "/perspective", defs);

			String xpcontractName=xPath.evaluate(xpPersp+"/contractname",defs);

			System.out.println("xpPersp:::"+xpPersp);
			System.out.println("dispName:::"+dispName);
			System.out.println("xpcontractName:::"+xpcontractName);

			contractList = new ArrayList<PerspectiveMap>();
			NodeList xmlcontractNameList = (NodeList) xPath.evaluate(xpcontractName, defs,XPathConstants.NODESET);
			for(int j=0;j<xmlcontractNameList.getLength();j++)
			{
				PerspectiveMap perspectivemap=new PerspectiveMap();
				perspectivemap.setId(id);
			 Node xmlcontractName=xmlcontractNameList.item(j);
             String contractName=xPath.evaluate("/contractname/name", xmlcontractName);
             System.out.println("contract name is ::"+contractName);
             perspectivemap.setContractName(contractName);

             String gsamName=xPath.evaluate("/contractname/gsam", xmlcontractName);
             System.out.println("gsam name is ::"+gsamName);
             perspectivemap.setGsamName(gsamName);

             String fileName=xPath.evaluate("/contractname/fileprefix", xmlcontractName);
             System.out.println("file prefix name is ::"+fileName);
             perspectivemap.setFileName(fileName);

             contractList.add(perspectivemap);

		System.err.println("PerspectiveMapDaoXmlImpl Found Perspective Id: "+ id+ " name: " + dispName); // XXX: remove after debuggin

		}
		

//XML FILE
><perspective id="opts029">
  <name>Contract1</name>
  <contractname>
     <name>AAN</name>
	 <ic-server>SAM-GSAM1</ic-server>
     <fileprefix>AAN</fileprefix>
  </contractname>
    <contractname>
     <name>PGL</name>
	 <ic-server>SAM-GSAM1</ic-server>
     <fileprefix>PGL</fileprefix>
  </contractname>
    <contractname>
     <name>GSK</name>
	 <ic-server>SAM-GSAM1</ic-server>
     <fileprefix>GSK</fileprefix>
  </contractname>
</perspective>

Regards,
Rama

[Jimmy Clark]

String gsamName=xPath.evaluate("/contractname/gsam", xmlcontractName);   

Where is the gsam element in the Perspective document?

[yekkala krishna]

Hi Clark,

Thanks for your suggestion.
Now my problem solves.

Regards,
Rama