[jboss-user] [JCA/JBoss] - why BaseConnectionManager2 throws Invalid authentication att

[Yilativs]

Hello

My application runs on
On 3.2.8.SP1 (build: CVSTag=JBoss_3_2_8_SP1 date=200603031235)
all works fine but if application stays without activity about 30mins

I recieve 
Invalid authentication attempt, principal=null
  |  java.lang.SecurityException: Invalid authentication attempt, principal=null
  | at 
  | org.jboss.resource.connectionmanager.BaseConnectionManager2.getSubject(BaseConnectionManager2.java:697)
  | at 
  | org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateConnection(BaseConnectionManager2.java:526)
  | at 
  | org.jboss.resource.connectionmanager.BaseConnectionManager2$ConnectionManagerProxy.allocateConnection(BaseConnectionManager2.java:926)
  | at 
  | org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:88)
  | 

Does anybody know why it happens and how to fix it?

Regards,
Vitaliy S

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