EmptyStackException

[Denis]

Hi,

we are using the Eclipse Oxygen Author in Version 15.2.

I use this method:

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  whatPossibleValuesHasAttributeContext = authorSchemaManager

                        .createWhatPossibleValuesHasAttributeContext(

                                authorElement, attributeAtIndex);

I get a EmptyStackException sometimes.

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	at java.util.Stack.peek(Stack.java:85)

	at java.util.Stack.pop(Stack.java:67)

	at ro.sync.ecss.contentcompletion.b.e(Unknown Source)

	at ro.sync.ecss.strictediting.k.createWhatPossibleValuesHasAttributeContext(Unknown Source)

	at de.kgucms.kgu.tps.client.oxygen.integration.adapter.AuthorNodePropertySource.handleAlreadyDeclaredAttributes(AuthorNodePropertySource.java:480)

Best regards,
Denis

[Radu]

Hi Denis,

Could you add some logging like System.err.println(String.valueOf(authorElement)) to see for what element this fails?
Also, the node for which you call the method should always be a part of the current document (so you should not call the method for a node located in an AuthorDocumentFragment for example).

Regards,
Radu

[Denis]

Hi Radu,

the error.println get this information

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<#reference href="file:path/To/Reference" ,> (3678, 3678)

The method works often without a problem, but sometimes I get the exception and I do not see the difference between the element which throws the exception and the elements, which not.

Best regards,
Denis

[alex_jitianu]

Hello Denis,

My colleague Radu is currently away on a conference so I will try to help you while he's not here.

This node is a reference not so you are probably inside a conref-ed content. I tried the same scenario and I didn't get an exception. This exception can happen if this node is not part of the document, if it comes from an AuthorDocumentFragment (like my colleague Radu also said). To test that you can use something like this:

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while (node != null) {

  System.out.println("Node " + node);

  node = node.getParent();

}

If you are not seeing all the elements up to the root, then you are in a fragment and you can't use this API for such nodes.

Also, you don't really need schema information for such a reference node. You most likely need it for its parent element, the one that has the conref attribute. These references nodes are transparent for the code that queries the schema, but just to see if it's any different, could you try something like this and see if you still get the exception?

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if (authorElement.getType() == AuthorNode.NODE_TYPE_REFERENCE) {

      authorElement = authorElement.getParent();

    }

    

    whatPossibleValuesHasAttributeContext = authorSchemaManager

        .createWhatPossibleValuesHasAttributeContext(

                authorElement, attributeAtIndex);

Best regards,
Alex