The following are the precautions when using the attachments in MTOM/XOP specification format:

• You cannot use them concurrently with the wsi:swaRef format attachments. Behavior is not guaranteed if used concurrently.
• You cannot send or receive them concurrently with the wsi:swaRef type attachments in a single operation.
• You cannot use them in the provider implementation class (class that implements the javax.xml.ws.provider interface). Behavior is not guaranteed if attachments in MTOM/XOP specification format are used in the provider implementation class.
• You cannot use them along with the handler framework. Behavior is not guaranteed if used along with the handler framework. To send and receive attachments when using the handler framework, use the attachment functionality (wsi:swaRef format).
• You cannot use them along with WSS (Cosminexus Web Services-Security). The behavior is not guaranteed if used along with WSS.