Maven spring namespace not found

I've trawled through a number of similar questions, but no one seems to have an answer for this problem, so I'm hoping someone will have a new solution to this issue:

I'm wrestling with this error:

2014-11-06 12:21:57 DEBUG PluggableSchemaResolver:147 - Loaded schema mappings: {}
2014-11-06 12:21:58 DEBUG DefaultBeanDefinitionDocumentReader:108 - Loading bean definitions
2014-11-06 12:21:58 DEBUG DefaultNamespaceHandlerResolver:157 - Loaded NamespaceHandler mappings: {}

Caused by: java.lang.RuntimeException: Exception in Application start method
....
Caused by: java.lang.RuntimeException: Exception in Application start method
....
Caused by: org.springframework.beans.factory.parsing.BeanDefinitionParsingException: Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://ift.tt/GArMu7]
Offending resource: class path resource [clientSpringConfig.xml]

Here is a chunk of my program's client-side POM.

 <execution>
                    <id>myClient</id>
                    <phase>package</phase>
                    <goals>
                        <goal>shade</goal>
                    </goals>
                    <configuration>
                        <outputFile>C:\Dev\MyAppDeploy\Client\MyAppClient.jar</outputFile>
                        <transformers>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
                                <manifestEntries>
                                    <Main-Class>uk.co.mycom.myClient.ClientStart</Main-Class>
                                    <Class-Path>.</Class-Path>
                                </manifestEntries>
                            </transformer>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                <resource>META-INF/spring.handlers</resource>
                            </transformer>
                            <transformer implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                                <resource>META-INF/spring.schemas</resource>
                            </transformer>
                        </transformers>
                        <filters>
                            <filter>
                                <artifact>*:*</artifact>
                                <includes>
                                    <include>uk/co/mycom/myClient/**</include>
                                    <include>uk/co/mycom/shared/**</include>
                                    <include>com/esotericsoftware/**</include>
                                    <include>org/springframework/**</include>
                                    <include>org/apache/log4j/**</include>
                                    <include>log4j.properties</include>
                                    <include>org/apache/commons/logging/**</include>
                                    <include>org/objenesis/**</include>
                                </includes>
                                <excludes>
                                    <exclude>uk/co/mycom/myAppServer/**</exclude>
                                    <!--<exclude>resources/**</exclude>-->
                                    <exclude>bat/**</exclude>
                                </excludes>
                            </filter>
                        </filters>
                    </configuration>
                </execution>
            </executions>

I like Maven shade and feel loathe to move, but I need to use Spring client side, and so what worked before now no longer works. I've seem folk advise Maven Assembly plugin. But as far as I can work out, the result is the same: if two files match, one will overwrite the other.

Any help much appreciated. Thanks.