使用 CXF 从 Camel 路由调用无参数 Web 服务操作

Question

ThingsService 是 jax-ws 生成的 web 服务接口（为了简洁起见去掉了注释）。有一种无参数方法：

public interface ThingsService {
    AvailableThingsResponse getAvailableThings();
}

尝试像这样使用 CXF 从 Camel 路由调用无参数操作：

from("timer:start?fixedRate=true")
        .setHeader(CxfConstants.OPERATION_NAME, constant("getAvailableThings")
        .to("cxf:http://localhost:8080/services/things"
            + "?serviceClass=" + ThingsService.class.getName());

调用端点时导致 Camel 呕吐：

java.lang.IllegalArgumentException: Get the wrong parameter size to invoke the out service, Expect size 0, Parameter size 1. Please check if the message body matches the CXFEndpoint POJO Dataformat request. at org.apache.camel.component.cxf.CxfProducer.checkParameterSize(CxfProducer.java:283) at org.apache.camel.component.cxf.CxfProducer.getParams(CxfProducer.java:321) at org.apache.camel.component.cxf.CxfProducer.process(CxfProducer.java:131) at org.apache.camel.processor.SendProcessor.process(SendProcessor.java:145) at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:77) at org.apache.camel.processor.RedeliveryErrorHandler.process(RedeliveryErrorHandler.java:542) at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:197) at org.apache.camel.processor.Pipeline.process(Pipeline.java:120) at org.apache.camel.processor.Pipeline.process(Pipeline.java:83) at org.apache.camel.processor.CamelInternalProcessor.process(CamelInternalProcessor.java:197) at org.apache.camel.component.timer.TimerConsumer.sendTimerExchange(TimerConsumer.java:192) at org.apache.camel.component.timer.TimerConsumer.run(TimerConsumer.java:76) at java.util.TimerThread.mainLoop(Timer.java:555) at util.TimerThread.run(Timer.java:505)

CXF 端点处于 POJO 模式，发送到端点的交换主体为空。

使用 CXF 组件从 Camel 路由调用无参数 WS 操作的正确方法是什么？

Answer 1

事实证明，no-params 使用空数组表示：

from("timer:start?fixedRate=true")
        .setHeader(CxfConstants.OPERATION_NAME, constant("getAvailableThings")
        .transform().body(o -> new Object[0])
        .to("cxf:http://localhost:8080/services/things"
            + "?serviceClass=" + ThingsService.class.getName());

使用 CXF 从 Camel 路由调用无参数 Web 服务操作

Calling no-params webservice operation from Camel route using CXF

cxf

apache-camel