Informix “Database locale information mismatch”

I have informix 11.5 running in my Win-2003 box and few databases running in it.
System databases have locale en_us.819
My custom databases have locale en_us.57372 (UTF8).

There is also application deployed to JBoss 4.0.2 which has few datasources configured for those custom databases.

<local-tx-datasource>
<jndi-name>InformixDS</jndi-name>
<connection-url>jdbc:informix-sqli://@database.server@:@database.port@/tcs_catalog:INFORMIXSERVER=@database.INFORMIXSERVER@</connection-url>
<driver-class>com.informix.jdbc.IfxDriver</driver-class>
<user-name>@database.username@</user-name>
<password>@database.password@</password>
    <new-connection-sql>set lock mode to wait 5</new-connection-sql>
    <check-valid-connection-sql>select '1' from dual</check-valid-connection-sql>
  <metadata>
     <type-mapping>InformixDB</type-mapping>
  </metadata>

I'm logged in as Administrator and when I start JBoss the following error is shown

Caused by: java.sql.SQLException: Database locale information mismatch.
    at com.informix.util.IfxErrMsg.getSQLException(IfxErrMsg.java:373)
    at com.informix.jdbc.IfxSqli.a(IfxSqli.java:3208)
    at com.informix.jdbc.IfxSqli.E(IfxSqli.java:3518)
    at com.informix.jdbc.IfxSqli.dispatchMsg(IfxSqli.java:2353)
    at com.informix.jdbc.IfxSqli.receiveMessage(IfxSqli.java:2269)
    at com.informix.jdbc.IfxSqli.executeOpenDatabase(IfxSqli.java:1786)
    at com.informix.jdbc.IfxSqliConnect.<init>(IfxSqliConnect.java:1327)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:501)
    at com.informix.jdbc.IfxDriver.connect(IfxDriver.java:254)
    at org.jboss.resource.adapter.jdbc.local.LocalManagedConnectionFactory.createManagedConnection(LocalManagedConnectionFactory.java:151)
    ... 160 more
Caused by: java.sql.SQLException
    at com.informix.util.IfxErrMsg.getSQLException(IfxErrMsg.java:373)
    at com.informix.jdbc.IfxSqli.E(IfxSqli.java:3523)
    ... 170 more

DB_LOCALE and CLIENT_LOCALE are set to en_us.utf8 for Administrator.

When I set in Server Studio DB_LOCALE and CLIENT_LOCALE to en_us.utf8 I can connect my databases.

Where should I set DB_LOCALE and CLIENT_LOCALE to avoid this Database locale information mismatch error?

Thanks.