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Unable to locate NamespaceHandler error in runing jdbc example

by sige :: Rate this Message:

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Hi
I got an " Unable to locate NamespaceHandler" when runing the jdbc example  in the muleesb-enterprise-standalone-installer-2.1.1, the error message is:

[11-21 11:43:11] ERROR AbstractConfigurationBuilder [WrapperListener_start_runner]: Configuration with "org.mule.config.spring.SpringXmlConfigurationBuilder" failed.
org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate NamespaceHandler for namespace [http://www.mulesource.org/schema/mule/core/2.1]
Offending resource: URL [file:/usr/local/mule/mule_ee/examples/jdbc/conf/jdbc-datasource.xml]
        at org.springframework.beans.factory.parsing.FailFastProblemReporter.error(FailFastProblemReporter.java:68)
        at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:85)
        at org.springframework.beans.factory.parsing.ReaderContext.error(ReaderContext.java:72)
......
* A Fatal error has occurred while the server was running:                     *
* Configuration problem: Unable to locate NamespaceHandler for namespace       *
* [http://www.mulesource.org/schema/mule/core/2.1]                             *
* Offending resource: URL                                                      *
* [file:/usr/local/mule/mule_ee/examples/jdbc/conf/jdbc-datasource.xml]        *
* (org.springframework.beans.factory.parsing.BeanDefinitionParsingException)   *
*                                                                              *
* The error is fatal, the system must shutdown                                 *

It seems that is not related to specific database connection problem, and I have not modified the file: jdbc-datasource.xml. Has anybody had this problem and any idea?
Thanks.
Sige

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