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Forum:
XML and Related Technologies
Parsing Error
yekkala krishna
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Posts: 105
posted 13 years ago
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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
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Posts: 2187
posted 13 years ago
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String gsamName=xPath.evaluate("/contractname/gsam", xmlcontractName);
Where is the gsam element in the Perspective document?
yekkala krishna
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Posts: 105
posted 13 years ago
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Hi Clark,
Thanks for your suggestion.
Now my problem solves.
Regards,
Rama
Don't get me started about those stupid
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