This one keeps on going and going

I blogged about this problem a year and a half ago.  It continues to live on.  If you are writing non-batch applications then set this setting to unshareable.  Yes, it is unfortunate the default is shareable but we need to deal with it.  This descriptor seems to move around so look for it either in the JDBC or thread section of the descriptors. 

Alexandre Polozoff on WebSphere Performance: Day One SHAREABLE JDBC connection setting

change the descriptor to UNSHAREABLE