at com.ibm.io.async.AsyncFuture.completed(AsyncFuture.java:111)

Hi,
My Configuration is as follow: WebSphere Application Server 6.1.0.19, it seems that this is sort of bug they have.
Offered solutions:

• Add "com.ibm.ws.webcontainer.ChannelWriteType=sync" as a custom property in the Web Container section. (via admin console).
• Download next upgrade 6.1.0.21 or 6.1.0.27 from http://www-01.ibm.com/support/docview.wss?rs=180&uid=swg27004980

Hopefully it helps,
Recommended link to look over : Click Here.
Dor