Wso2 充实中介器要插入到消息正文中的对象类型无效

错误：要插入到消息正文中的丰富中介无效对象类型

尝试充实消息时，以下是代理配置：

<proxy xmlns="http://ws.apache.org/ns/synapse" name="Database" transports="https,http" statistics="disable" trace="disable" startOnLoad="true">
   <target>
      <inSequence>
         <dblookup>
            <connection>
               <pool>
                  <password>1234</password>
                  <user>root</user>
                  <url>jdbc:mysql://localhost:3306/new_db</url>
                  <driver>com.mysql.jdbc.Driver</driver>
               </pool>
            </connection>
            <statement>
               <sql>select * from users where name="rik"</sql>
               <result name="client_expiration" column="expiration" />
               <result name="client_id" column="id" />
               <result name="client_name" column="name" />
            </statement>
         </dblookup>
         <log level="custom">
            <property name="returned value for client_expiration is :" expression="get-property('client_expiration')" />
            <property name="returned value for client_id is :" expression="get-property('client_id')" />
            <property name="returned value for client_name is :" expression="get-property('client_name')" />
         </log>
         <property name="property1" expression="get-property('client_expiration')" scope="default" />
         <enrich>
            <source type="property" property="property1" />
            <target type="body" action="sibling" />
         </enrich>
         <sequence key="getback" />
      </inSequence>
   </target>
</proxy>

1234
根
jdbc：mysql://localhost:3306/new_db
com.mysql.jdbc.Driver
从用户中选择*，其中name=“rik”

以及序列配置（但此处不应出现问题）：

非常感谢

编辑：日志有效，但消息无效。这是日志文件：

[2012-09-03 09:44:28,853]  INFO - LogMediator returned value for client_expirati
on is : = 2012-08-30, returned value for client_id is : = 1, returned value for
client_name is : = rik
[2012-09-03 09:44:28,854] ERROR - EnrichMediator Invalid Object type to be inser
ted into message body
[2012-09-03 09:44:28,856]  INFO - LogMediator To: , WSAction: urn:mediate, SOAPA
ction: urn:mediate, MessageID: urn:uuid:f0035921-8b6a-48db-a9a4-78be2687336d, Di
rection: response, Envelope: <?xml version='1.0' encoding='utf-8'?><soapenv:Enve
lope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/"><soapenv:Body /><
/soapenv:Envelope>

[2012-09-03 09:44:28853]信息-LogMediator为客户端返回值
在is:=2012-08-30上，客户端id的返回值为：=1，客户端id的返回值为
客户名称为：=rik
[2012-09-03 09:44:28854]错误-要插入的EnrichMediator对象类型无效
将文本转换为消息体
[2012-09-03 09:44:28856]信息-日志中介收件人：，WSAction:urn:mediate，SOAPA
操作：urn:mediate，消息ID:urn:uuid:f0035921-8b6a-48db-a9a4-78be2687336d，Di
回复：回复，信封：<
/soapenv:信封>

像这样丰富中介并尝试

<enrich>
            <source type="custom" xpath="get-property('property1')"/>
            <target type="body" action="sibling"/>
        </enrich>

---

不幸的是，它没有改变错误，如果您想查看，我已经发布了日志。。。

<enrich>
            <source type="custom" xpath="get-property('property1')"/>
            <target type="body" action="sibling"/>
        </enrich>