Re: oracle.AQ.AQOracleSQLException: Cannot map Unicode to Oracle character.

Quoting from Metalink

The Oracle Thin driver supports the following character sets trough basic zip/jar files (classes111.zip, classes111.jar, classes12.zip and classes12.jar, ojdbc14.jar) they contain all the necessary classes to provide complete NLS support for:

• Oracle Character sets for CHAR/VARCHAR/LONGVARCHAR/CLOB type data that is not retrieved or inserted as a data member of an Oracle 8 Object or Collection type.
• NLS support for CHAR/VARCHAR data members of Objects and Collections for a few commonly used character sets. These character sets are: US7ASCII, WE8DEC, WE8ISO8859P1 and UTF8.

If your database use a other character set (WE8ISO8859P15,WE8MSWIN1252, EE8MSWIN1250,...)
you must include nls_charsetxx.zip/nls_charsetxx.jar in your CLASSPATH.

Hth

-- 
Sybrand Bakker
Senior Oracle DBA