如何在apache camel spring xml中创建MAP属性值？

<util:map id="myMap" map-class="java.util.HashMap">
    <entry key="key1" value="value1" />
    <entry key="key2" value="value2" />
</util:map>

<bean id="myMap" class="java.util.HashMap">
    <constructor-arg>
        <map>
            <entry key="key1" value="value1" />
            <entry key="key2" value="value2" />
        </map>
    </constructor-arg>
</bean>

<route>
    <from uri="direct:start" />
    <setHeader headerName="myHeader">
        <constant>${myMap}</constant>
    </setHeader>
    <to uri="log:myLog" />
</route>

public class MyProcessor implements Processor {
    public void process(Exchange exchange) throws Exception {
        Map<String, String> myMap = exchange.getIn().getHeader("myHeader", Map.class);
        // 进行Map属性值的处理
    }
}