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最近在工作中遇到了一个Fegin传参异常，特此记录便于日后查阅。

java.lang.IllegalArgumentException: Body parameter 0 was null
	at feign.Util.checkArgument(Util.java:102)
	at feign.ReflectiveFeign$BuildEncodedTemplateFromArgs.resolve(ReflectiveFeign.java:343)
	at feign.ReflectiveFeign$BuildTemplateByResolvingArgs.create(ReflectiveFeign.java:213)
	at feign.SynchronousMethodHandler.invoke(SynchronousMethodHandler.java:72)
	at feign.ReflectiveFeign$FeignInvocationHandler.invoke(ReflectiveFeign.java:103)
	at com.sun.proxy.$Proxy88.productTypeBatchSetRedis(Unknown Source)
	at com.openailab.oascloud.security.crontab.ProductTypeCacheCron.lambda$configureTasks$0(ProductTypeCacheCron.java:38)
	at org.springframework.scheduling.support.DelegatingErrorHandlingRunnable.run(DelegatingErrorHandlingRunnable.java:54)
	at org.springframework.scheduling.concurrent.ReschedulingRunnable.run(ReschedulingRunnable.java:93)
	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
	at java.util.concurrent.FutureTask.run(FutureTask.java:266)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
	at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
	at java.lang.Thread.run(Thread.java:748)

造成这个错误的原因是，我在服务a 调用服务b 的时候参数传递的是null，而服务b通过 @RequestBody 来接收参数，@RequestBody 的 required 默认值是true。


解决方法：



@RequestBody（required=false）或者传参数时限制参数不能为null。