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If the user deploys a web application with context path equal to a predeployed web application, the original application is undeployed without the user being noticed. This is ok if it is a redeployment of the same project; however it may be bad if it is a different project just with context path collision. The same issue applies to module names (ejb / web); and may also apply to resources or web service endpoints. A more severe variant of this issue is: http://www.netbeans.org/issues/show_bug.cgi?id=91791
-> j2eeserver, tm -> 6.0
none of these TM values are valid at this point
Obviously this has not ever been reported by a real user.