JBoss threads hang on T2CConnection.t2cLobCreateTemporary

"main" prio=10 tid=0x00007f1ce814f800 nid=0x344c runnable [0x00007f1cde42b000]
   java.lang.Thread.State: RUNNABLE
     at oracle.jdbc.driver.T2CConnection.t2cLobCreateTemporary(Native Method)
     at oracle.jdbc.driver.T2CConnection.createTemporaryClob(T2CConnection.java:2829)
     - locked <0x000000077e18bfc0> (a oracle.jdbc.driver.T2CConnection)
     at oracle.jdbc.driver.PhysicalConnection.createClob(PhysicalConnection.java:9563)
     at oracle.jdbc.driver.T2CConnection.createClob(T2CConnection.java:47)
     at org.jboss.resource.adapter.jdbc.jdk6.WrappedConnectionJDK6.createClob(WrappedConnectionJDK6.java:128)
     at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
     at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
     at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
     at java.lang.reflect.Method.invoke(Method.java:616)
     at org.hibernate.engine.jdbc.JdbcSupportLoader.useContextualLobCreation(JdbcSupportLoader.java:97)