yiayiao opened a new issue, #3956:
URL: https://github.com/apache/servicecomb-java-chassis/issues/3956
版本：1.3.10
业务为REST接口，非Reactive模式，业务调用三方接口为Reactive模式，调用三方结束后，通过CompletableFuture的get方法获取三方调用结果后返回。
问题发生的场景为压测的过程中，三方未扩容，最后负载均衡失败，LoadBalancer.chooseServer返回null，导致了InvokerUtils的reactiveInvoke方法封装到invocation.next的AsyncResponse被调用：
` invocation.next(ar -> {
ContextUtils.setInvocationContext(invocation.getParentContext());
try {
invocation.getInvocationStageTrace().finishHandlersResponse();
invocation.onFinish(ar);
asyncResp.handle(ar);
} finally {
ContextUtils.removeInvocationContext();
}
});`
调用导致ContextUtils.removeInvocationContext()语句执行，ContextUtils中的contextMgr被清理，如下业务代码执行触发空指针异常：
ContextUtils.getInvocationContext().getLocalContext().put(CommonConstant.RETURN_CODE,0)
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