UIBean end() method prints exceptions directly into System.err:

[code]
    public boolean end(Writer writer, String body) {
        evaluateParams();
        try {
            super.end(writer, body, false);
            mergeTemplate(writer, buildTemplateName(template, getDefaultTemplate()));
        } catch (Exception e) {
            e.printStackTrace();
        }
        finally {
         popComponentStack();
        }

        return false;
    }

[/code]


Could you replace "e.printStackTrace();" with "LOG.error("Exception while rendering tag", e)"?

It is difficult to get control over System.err in contrast to the Logger output.