core/src/main/java/org/apache/commons/jelly/impl/DynamicBeanTag.java [102:155]:
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            throw new JellyTagException("Could not instantiate dynabean", e);
        }

        setAttributesSet.clear();
    }

    public void setAttribute(String name, Object value) throws JellyTagException {
        boolean isVariableName = false;
        if (variableNameAttribute != null ) {
            if ( variableNameAttribute.equals( name ) ) {
                if (value == null) {
                    var = null;
                }
                else {
                    var = value.toString();
                }
                isVariableName = true;
            }
        }
        if (! isVariableName) {

            // #### strictly speaking we could
            // know what attributes are specified at compile time
            // so this dynamic set is unnecessary
            setAttributesSet.add(name);

            // we could maybe implement attribute specific validation here

            super.setAttribute(name, value);
        }
    }

    // Tag interface
    //-------------------------------------------------------------------------
    public void doTag(XMLOutput output) throws JellyTagException {

        // lets find any attributes that are not set and
        for ( Iterator iter = attributes.values().iterator(); iter.hasNext(); ) {
            Attribute attribute = (Attribute) iter.next();
            String name = attribute.getName();
            if ( ! setAttributesSet.contains( name ) ) {
                if ( attribute.isRequired() ) {
                    throw new MissingAttributeException(name);
                }
                // lets get the default value
                Object value = null;
                Expression expression = attribute.getDefaultValue();
                if ( expression != null ) {
                    value = expression.evaluate(context);
                }

                // only set non-null values?
                if ( value != null ) {
                    super.setAttribute(name, value);
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core/src/main/java/org/apache/commons/jelly/impl/DynamicDynaBeanTag.java [72:125]:
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            throw new JellyTagException("Could not instantiate dynabean", e);
        }

        setAttributesSet.clear();
    }

    public void setAttribute(String name, Object value) throws JellyTagException {
        boolean isVariableName = false;
        if (variableNameAttribute != null ) {
            if ( variableNameAttribute.equals( name ) ) {
                if (value == null) {
                    var = null;
                }
                else {
                    var = value.toString();
                }
                isVariableName = true;
            }
        }
        if (! isVariableName) {

            // #### strictly speaking we could
            // know what attributes are specified at compile time
            // so this dynamic set is unnecessary
            setAttributesSet.add(name);

            // we could maybe implement attribute specific validation here

            super.setAttribute(name, value);
        }
    }

    // Tag interface
    //-------------------------------------------------------------------------
    public void doTag(XMLOutput output) throws JellyTagException {

        // lets find any attributes that are not set and
        for ( Iterator iter = attributes.values().iterator(); iter.hasNext(); ) {
            Attribute attribute = (Attribute) iter.next();
            String name = attribute.getName();
            if ( ! setAttributesSet.contains( name ) ) {
                if ( attribute.isRequired() ) {
                    throw new MissingAttributeException(name);
                }
                // lets get the default value
                Object value = null;
                Expression expression = attribute.getDefaultValue();
                if ( expression != null ) {
                    value = expression.evaluate(context);
                }

                // only set non-null values?
                if ( value != null ) {
                    super.setAttribute(name, value);
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