no declaration can be found for element 'constructor-arg'

Question

The error when running:

Caused by: org.xml.sax.SAXParseException; lineNumber: 34; columnNumber: 30; cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'constructor-arg'.
    at org.apache.xerces.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
    at org.apache.xerces.util.ErrorHandlerWrapper.error(Unknown Source)

The source:

<spring:bean id="HandlerA_id" name="HandlerA" class="Handler"> 
            <constructor-arg> 
                <ref bean="BeanA"></ref>  
            </constructor-arg>  
        </spring:bean> 

The editor recognizes the constructor-arg tag and gives a summary upon roll-over. In the config file, xsi:schemaLocation value contains (among others):

"...http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd..."

If you examine the xsd at that URL, you can see that the constructor-arg tag is valid for group beanElements which is one of the complex types allowed in 'bean'

Does the runtime not properly validate XML under some conditions?

Answer 1

Include the spring: prefix in the tag. Same for the ref tag.