Re: [Simple-support] Null pointer in Reference.getType when using @Converter

[Lumsdon, H. <Hug...@bl...>]

Thanks Neil – we’ll take a look at transform.

We also discovered if we return empty string (“”) in our converter in the event of a null value it also fixes it.


From: Niall Gallagher [mailto:gal...@ya...]
Sent: 02 November 2011 11:02
To: simple-support@lists sourceforge. net; Lumsdon, Hugo
Subject: Re: [Simple-support] Null pointer in Reference.getType when using @Converter




Try a transform for strings, coverters are for composite objects not strings.

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________________________________
From: Lumsdon, Hugo <Hug...@bl...>;
To: sim...@li... <sim...@li...>;
Subject: [Simple-support] Null pointer in Reference.getType when using @Converter
Sent: Mon, Oct 31, 2011 6:52:50 PM
Hi,

We are trying to escape Xhtml on file read using an @Converter tag – however Simple falls over with a NPE when we have empty tags in our XML source docs – e.g.

<message/>



Here is an example of the @Converter annotation:

@Element(required = false)
@Convert(EscapeXhtmlConverter.class)
private String message = "";



And here is the very simple EscapeXhtmlConverter class:


import org.simpleframework.xml.convert.Converter;
import org.simpleframework.xml.stream.InputNode;
import org.simpleframework.xml.stream.OutputNode;

import freemarker.template.utility.StringUtil;

// TODO: Auto-generated Javadoc
/**
* The Class EscapeXmlConverter.
*/
public class EscapeXhtmlConverter implements Converter<String> {

       /* (non-Javadoc)
       * @see org.simpleframework.xml.convert.Converter#read(org.simpleframework.xml.stream.InputNode)
       */
       @Override
       public String read(InputNode node) throws Exception {
              String value = node.getValue();
              String escapedValue = StringUtil.XHTMLEnc(value);
              return escapedValue;
       }

       @Override
       public void write(OutputNode node, String value) throws Exception {
              // Do nothing for now
       }


}




And the stack trace:

java.lang.NullPointerException
        at org.simpleframework.xml.convert.Reference.getType(Reference.java:70)
        at org.simpleframework.xml.core.Factory.getOverride(Factory.java:143)
        at org.simpleframework.xml.core.PrimitiveFactory.getInstance(PrimitiveFactory.java:82)
        at org.simpleframework.xml.core.Primitive.readElement(Primitive.java:186)
        at org.simpleframework.xml.core.Primitive.read(Primitive.java:124)
        at org.simpleframework.xml.core.Composite.readVariable(Composite.java:687)
        at org.simpleframework.xml.core.Composite.readInstance(Composite.java:635)
        at org.simpleframework.xml.core.Composite.readUnion(Composite.java:610)
        at org.simpleframework.xml.core.Composite.readElement(Composite.java:593)
        at org.simpleframework.xml.core.Composite.readElements(Composite.java:506)
        at org.simpleframework.xml.core.Composite.readSection(Composite.java:388)
        at org.simpleframework.xml.core.Composite.read(Composite.java:367)
        at org.simpleframework.xml.core.Composite.readDefault(Composite.java:262)
        at org.simpleframework.xml.core.Composite.read(Composite.java:232)
        at org.simpleframework.xml.core.Composite.read(Composite.java:202)
        at org.simpleframework.xml.core.Composite.read(Composite.java:150)
        at org.simpleframework.xml.core.Traverser.read(Traverser.java:92)
        at org.simpleframework.xml.core.Persister.read(Persister.java:632)
        at org.simpleframework.xml.core.Persister.read(Persister.java:613)
        at org.simpleframework.xml.core.Persister.read(Persister.java:591)
        at org.simpleframework.xml.core.Persister.read(Persister.java:550)
        at org.simpleframework.xml.core.Persister.read(Persister.java:451)
        at com.blackrock.ebiz.corecms.dao.shared.XmlMarshallerImpl.deserialise(XmlMarshallerImpl.java:30)
….




Thanks!




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