Empty element parsing issue

[alexandra12]

Hello,

I am trying to parse an xml document and I am getting parser errors. One of the elements is empty - and this is where I get the errors.

Here is sample code

ERROR

java.lang.NumberFormatException: empty String
	at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1038)
	at java.lang.Double.valueOf(Double.java:487)

GETTER/SETTER

@Column(length=10)
private Double num=0.0;

public Double getNum() {
		return this.num;
	}

public void setNum(Double num) {
	
		//this.num = num == null ? 0.0 : num;
		this.num = num == null ? Double.NaN : num;
	}

}

SAMPLE SCHEMA WHERE IT ERRORS

<object>
<label>label</label>
<num/> // it errors here
<units>zero</units>
</object>

SETTING THE VALUE IN THE CLASS - SAXPARSER

if(qName.equalsIgnoreCase("num")){
			
			Tmp.setNum(Double.valueOf(String).doubleValue());

Can anyone offer any advice ?
Thanks in advance

[Norm]

You left of the part of the error message that shows where in your code the error happened.

Can you make a small, complete program that compiles, executes and shows the problem?

[alexandra12]

Here is the error

label is B6 G151 Rel Lab 1 
in end label
in the start element
in the end element
begining the transaction
get entity manger
going to begin
going to perist
going to commit
java.lang.NullPointerException
	at sun.misc.FloatingDecimal.readJavaFormatString(FloatingDecimal.java:1035)
	at java.lang.Double.valueOf(Double.java:487)
	at com.ibm.north.northCommander.endElement(northCommander.java:154)
	at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
	at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)in the end element
begining the transaction
get entity manger
going to begin
going to perist
going to commit

	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
	at org.apache.xerces.parsers.XMLParser.parse(Unknown Source)
	at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
	at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)
	at com.ibm.north.northCommander.main(northCommander.java:313)
in end object

Here is the xml file with the detail

<object id="P32O3" type="num" status="ok" updated="2012-08-20T02:52:18">
<label>B6 G32 SDF Rel Lab</label>
<num>101.17</num>
<units>KW</units>
</object>
<object id="P32O4" type="num" status="ok" updated="2012-05-28T15:55:36" logavailable="true">
<label>B6 G151 Rel Lab 1 </label>
<num/>
object>
<object id="P32O5" type="num" status="ok" updated="2012-08-20T02:52:19" logavailable="true">
<label>B6 G39 Server A</label>
<num>14590.47</num>
<units>KW</units>
</object>

I am using JPA to persist the data into the database with an entity manager

public String createRawData(RawData RawData)
			throws Exception {
		System.out.println("begining the transaction");
		EntityManager em = getEntityManager();
		System.out.println("get entity manger");
		try {
			System.out.println("going to begin");
			em.getTransaction().begin();
			System.out.println("going to perist");
			em.persist(northRawData);
			System.out.println("going to commit");
			em.getTransaction().commit();
			
			
		} catch (Exception ex) {
			try {
				if (em.getTransaction().isActive()) {
					em.getTransaction().rollback();
				}
			} catch (Exception e) {
				ex.printStackTrace();
				throw e;
			}
			throw ex;
		} finally {
			em.close();
		}
		return "";
	}

[Norm]

Sorry, no way to compile and test with what was posted.