Axway发布的Java RESTful API报InvokableMethodParamException异常求助

我们维护着一个基于Java开发、通过Axway发布的RESTful API，近期突然出现如下异常：

java exception: com.vordel.coreapireg.runtime.broker.InvokableMethodParamException

谷歌搜索仅得到3条结果，均指向Axway版本升级，但我们并未进行版本升级，因此可排除该原因。

完整堆栈信息如下：

java exception:
com.vordel.coreapireg.runtime.broker.InvokableMethodParamException:
Missing parameter file at
com.vordel.coreapireg.runtime.broker.parameters.OutboundParam.validate(OutboundParam.java:65)
at
com.vordel.coreapireg.runtime.broker.parameters.OutboundParam.evaluate(OutboundParam.java:59)
at
com.vordel.coreapireg.runtime.broker.parameters.query.VirtualizedQueryParamValidator.validate(VirtualizedQueryParamValidator.java:77)
at
com.vordel.coreapireg.runtime.broker.parameters.query.VirtualizedQueryParamValidator.validate(VirtualizedQueryParamValidator.java:27)
at
com.vordel.coreapireg.runtime.broker.parameters.ParameterValidator.validate(ParameterValidator.java:253)
at
com.vordel.coreapireg.runtime.broker.InvokableMethod.processParameters(InvokableMethod.java:105)
at
com.vordel.coreapireg.runtime.broker.InvokableMethod.invoke(InvokableMethod.java:150)
at com.vordel.apiportal.runtime.Broker.invokeMethod(Broker.java:174)
at
com.vordel.coreapireg.runtime.CoreApiBroker.processRequest(CoreApiBroker.java:283)
at com.vordel.apiportal.runtime.Broker.processRequest(Broker.java:110)
at
com.vordel.apiportal.runtime.virtualized.VApiRuntime.processRequest(VApiRuntime.java:134)
at
com.vordel.apiportal.runtime.PortalBroker.processRequest(PortalBroker.java:94)
at com.vordel.dwe.http.HTTPPlugin.invokeDispose(HTTPPlugin.java:525)
at com.vordel.dwe.http.HTTPPlugin.invoke(HTTPPlugin.java:157)

请求完全被Axway拦截，无法抵达后端API，上述堆栈信息来自Axway平台监控。

如有遇到过该异常的同仁，恳请分享解决方案！

内容的提问来源于stack exchange，提问作者Carlos Jaime C. De Leon