Adding Javadoc comments for COM

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@179026 a5903396-d722-0410-b921-86c7d4935375
Update to RDBMS context field impl.

git-svn-id: https://svn.wso2.org/repos/wso2/carbon/platform/trunk@179027 a5903396-d722-0410-b921-86c7d4935375