如何使用log4j.xml在Oracle表CLOB中插入大型xml

I want to log an xml/text > 3999 chars in a Oracle table CLOB using log4j.xml. Insert query does not work and it says "String too long". I also tried using a procedure, it works fine in Oracle but I donot know how to execute that Procedure from Log4j.xml.I want to log an xml/text > 3999 chars in a Ora