FULL PRODUCT VERSION :
java version " 1.7.0_07 "
Java(TM) SE Runtime Environment (build 1.7.0_07-b10)
Java HotSpot(TM) 64-Bit Server VM (build 23.3-b01, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Microsoft Windows [Version 6.1.7601]

EXTRA RELEVANT SYSTEM CONFIGURATION :
64 Bit Windows 2008 R2, 64 Bit Java 1.7

A DESCRIPTION OF THE PROBLEM :
This might be a multithreadin issue as it occurs only very seldom:

------------------
     java.lang.NullPointerException
         at java.sql.DriverManager.println(Unknown Source)
         at net.sourceforge.jtds.util.Logger.println(Logger.java:79)
-----------------



STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Difficult, as it only uccurs rarely (about once a month) during heavy application traffic, i.e. many parallel database statements.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No NullPointerException in java.sql.DriverManager.println()
ACTUAL -
------------------
     java.lang.NullPointerException
         at java.sql.DriverManager.println(Unknown Source)
         at net.sourceforge.jtds.util.Logger.println(Logger.java:79)
-----------------

ERROR MESSAGES/STACK TRACES THAT OCCUR :
------------------
     java.lang.NullPointerException
         at java.sql.DriverManager.println(Unknown Source)
         at net.sourceforge.jtds.util.Logger.println(Logger.java:79)
-----------------

REPRODUCIBILITY :
This bug can be reproduced rarely.

---------- BEGIN SOURCE ----------
Many parallel database queries from a Java application via JDBC (and jTDS JDBC driver).
---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
Executing the very same database query a second time.