CODEWITHSUNDEEP
javaxmlexception
A.Antri
A.Antri

Reputation: 127

How to catch NoSuchMethodException

I am trying to Deserialize XML file containing methods. Snippet looks like:

 XMLDecoder decoder = new XMLDecoder(os); 
    deSerializedObject = decoder.readObject(); 
    decoder.close();
    return deSerializedObject;

When XML file does not contain method for every object.It throws NoSuchMethodException @ readObject.

java.lang.NoSuchMethodException: No method with name add is found at java.beans.Statement.findMethod(Statement.java:454) at java.beans.Statement.invokeMethodImpl(Statement.java:247) at java.beans.Statement.access$000(Statement.java:46) at java.beans.Statement$1.run(Statement.java:130) at java.security.AccessController.doPrivileged(AccessController.java:284) at java.beans.Statement.invokeMethod(Statement.java:127) at java.beans.Expression.getValue(Expression.java:67) at java.beans.XMLDecoder$SAXHandler.executeCommon(XMLDecoder.java:392) at java.beans.XMLDecoder$SAXHandler.execute(XMLDecoder.java:321) at java.beans.XMLDecoder$SAXHandler.endElement(XMLDecoder.java:286) at org.apache.xerces.parsers.AbstractSAXParser.endElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanEndElement(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source) at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source) at org.apache.xerces.parsers.XMLParser.parse(Unknown Source) at org.apache.xerces.parsers.AbstractSAXParser.parse(Unknown Source)
at org.apache.xerces.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source) at org.apache.xerces.jaxp.SAXParserImpl.parse(Unknown Source) at javax.xml.parsers.SAXParser.parse(Unknown Source) at java.beans.XMLDecoder.readObject(XMLDecoder.java:662)

Problem is I can not catch this exception. What is the proper way to handle it?

try{
        deSerializedObject = decoder.readObject();
        System.out.println("We are after read object");
        }
        catch (NoSuchMethodException e)
        {
            System.out.println("We are in catch block !!");
            e.printStackTrace();
        }
        decoder.close();
        return deSerializedObject;

Here error is "Unreachable catch block for NoSuchMethodException. This exception is never thrown from the try statement body"

XML Looks like 

<?xml version="1.0" encoding="UTF-8"?>
<java version="1.6.0" class="java.beans.XMLDecoder">
 <object class="java.util.ArrayList">
  <void method="add">
   <object class="InfoParameters">
    <void property="Name">
     <string>Jay</string>
    </void>
     <void property="Level">
     <string>10</string>
    </void>
   </object>
   <object class="InfoParameters">
    <void property="Name">
     <string>Hir</string>
    </void>
    <void property="Level">
     <string>10</string>
    </void>
   </object>
  </void>
 </object>
</java>

Upvotes: 2

Views: 1625

Answers (2)

Hunter McMillen
Hunter McMillen

Reputation: 61512

Why can't you catch this exception?

XMLDecoder decoder = new XMLDecoder(os); 

try
{
    deSerializedObject = decoder.readObject(); 
}
catch(NoSuchMethodException nsme)
{
    System.err.println(nsme.getMessage());
}
catch(Exception e)
{
    //try me
}

decoder.close();
return deSerializedObject;

Upvotes: 3

Jan Gr&#228;fen
Jan Gr&#228;fen

Reputation: 314

If for some reason "catch (Exception e)" is not working try:

try {
    ...
} catch (Throwable t) {
    ...
}

This should catch every possible exception and error, since it's the base class for all exceptions.

Upvotes: 0

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