首页 \ 问答 \ appengine magic，几乎满意，但在repl上获得空指针(appengine magic, almost satisfied but getting null pointer on repl)

appengine magic，几乎满意，但在repl上获得空指针(appengine magic, almost satisfied but getting null pointer on repl)

 我在dev_appserver.sh上使用了webapp（用appengine-magic和lein制作），但因为我需要更多的交互性而不需要重新启动服务器，所以我更喜欢使用repl。 现在的问题是，在我这之后(require '[appengine-magic.core :as ae]) ， (use 'myapp.core)并尝试提供应用程序(ae/serve myapp)我得到了这个例外： 
 

[Thrown class java.lang.NullPointerException]

Backtrace:
  0: java.io.File.<init>(File.java:360)
  1: sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  2: sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
  3: sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
  4: java.lang.reflect.Constructor.newInstance(Constructor.java:513)
  5: clojure.lang.Reflector.invokeConstructor(Reflector.java:160)
  6: appengine_magic.core$start.doInvoke(core_local.clj:85)
  7: clojure.lang.RestFn.invoke(RestFn.java:439)
  8: appengine_magic.core$serve.doInvoke(core_local.clj:139)
  9: clojure.lang.RestFn.invoke(RestFn.java:410)
 10: user$eval2264.invoke(NO_SOURCE_FILE:1)
 11: clojure.lang.Compiler.eval(Compiler.java:5424)
 12: clojure.lang.Compiler.eval(Compiler.java:5391)
 13: clojure.core$eval.invoke(core.clj:2382)
 14: swank.commands.basic$eval_region.invoke(basic.clj:47)
 15: swank.commands.basic$eval_region.invoke(basic.clj:37)
 16: swank.commands.basic$eval807$listener_eval__808.invoke(basic.clj:71)
 17: clojure.lang.Var.invoke(Var.java:365)
 18: user$eval2262.invoke(NO_SOURCE_FILE)
 19: clojure.lang.Compiler.eval(Compiler.java:5424)
 20: clojure.lang.Compiler.eval(Compiler.java:5391)
 21: clojure.core$eval.invoke(core.clj:2382)
 22: swank.core$eval_in_emacs_package.invoke(core.clj:92)
 23: swank.core$eval_for_emacs.invoke(core.clj:239)
 24: clojure.lang.Var.invoke(Var.java:373)
 25: clojure.lang.AFn.applyToHelper(AFn.java:167)
 26: clojure.lang.Var.applyTo(Var.java:482)
 27: clojure.core$apply.invoke(core.clj:540)
 28: swank.core$eval_from_control.invoke(core.clj:99)
 29: swank.core$eval_loop.invoke(core.clj:104)
 30: swank.core$spawn_repl_thread$fn__493$fn__494.invoke(core.clj:309)
 31: clojure.lang.AFn.applyToHelper(AFn.java:159)
 32: clojure.lang.AFn.applyTo(AFn.java:151)
 33: clojure.core$apply.invoke(core.clj:540)
 34: swank.core$spawn_repl_thread$fn__493.doInvoke(core.clj:306)
 35: clojure.lang.RestFn.invoke(RestFn.java:397)
 36: clojure.lang.AFn.run(AFn.java:24)
 37: java.lang.Thread.run(Thread.java:680)

 

 我也试过（in-ns'myapp.core）但效果相同。 当我直接在repl和服务上粘贴web应用程序处理程序然后它可以工作，但不是从我的文件。 
 

 调用myapp或myapp-handler清楚地给出了“对象”所以我应该真的在正确的命名空间... 
 

 project.clj 
 

(defproject myapp "1.0.0-SNAPSHOT"
  :description "FIXME: write description"
  :dependencies [
        [org.clojure/clojure "1.2.1"]
        [compojure "0.6.2"]
        ]
  :dev-dependencies [
            [appengine-magic "0.4.1"]
            [ring/ring-devel "0.3.7"]
            ])

 

 core.clj就是这么简单： 
 

(ns myapp.core
    (:use compojure.core)
    (:require [appengine-magic.core :as ae]))

(defroutes myapp-handler
    (GET "/" req
       {:status 200
        :headers {"Content-Type" "text/plain"}
        :body "Hello, world!!!"}))

(ae/def-appengine-app myapp #'myapp-handler)


I got webapp (made with appengine-magic and lein) working on dev_appserver.sh but because I need more interactivity and less restarting the server I prefer to use repl. Now problem is, that after I do (require '[appengine-magic.core :as ae]), (use 'myapp.core) and try to serve application (ae/serve myapp) I get this exception:
 

[Thrown class java.lang.NullPointerException]

Backtrace:
  0: java.io.File.<init>(File.java:360)
  1: sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  2: sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
  3: sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
  4: java.lang.reflect.Constructor.newInstance(Constructor.java:513)
  5: clojure.lang.Reflector.invokeConstructor(Reflector.java:160)
  6: appengine_magic.core$start.doInvoke(core_local.clj:85)
  7: clojure.lang.RestFn.invoke(RestFn.java:439)
  8: appengine_magic.core$serve.doInvoke(core_local.clj:139)
  9: clojure.lang.RestFn.invoke(RestFn.java:410)
 10: user$eval2264.invoke(NO_SOURCE_FILE:1)
 11: clojure.lang.Compiler.eval(Compiler.java:5424)
 12: clojure.lang.Compiler.eval(Compiler.java:5391)
 13: clojure.core$eval.invoke(core.clj:2382)
 14: swank.commands.basic$eval_region.invoke(basic.clj:47)
 15: swank.commands.basic$eval_region.invoke(basic.clj:37)
 16: swank.commands.basic$eval807$listener_eval__808.invoke(basic.clj:71)
 17: clojure.lang.Var.invoke(Var.java:365)
 18: user$eval2262.invoke(NO_SOURCE_FILE)
 19: clojure.lang.Compiler.eval(Compiler.java:5424)
 20: clojure.lang.Compiler.eval(Compiler.java:5391)
 21: clojure.core$eval.invoke(core.clj:2382)
 22: swank.core$eval_in_emacs_package.invoke(core.clj:92)
 23: swank.core$eval_for_emacs.invoke(core.clj:239)
 24: clojure.lang.Var.invoke(Var.java:373)
 25: clojure.lang.AFn.applyToHelper(AFn.java:167)
 26: clojure.lang.Var.applyTo(Var.java:482)
 27: clojure.core$apply.invoke(core.clj:540)
 28: swank.core$eval_from_control.invoke(core.clj:99)
 29: swank.core$eval_loop.invoke(core.clj:104)
 30: swank.core$spawn_repl_thread$fn__493$fn__494.invoke(core.clj:309)
 31: clojure.lang.AFn.applyToHelper(AFn.java:159)
 32: clojure.lang.AFn.applyTo(AFn.java:151)
 33: clojure.core$apply.invoke(core.clj:540)
 34: swank.core$spawn_repl_thread$fn__493.doInvoke(core.clj:306)
 35: clojure.lang.RestFn.invoke(RestFn.java:397)
 36: clojure.lang.AFn.run(AFn.java:24)
 37: java.lang.Thread.run(Thread.java:680)

 

I have also tried (in-ns 'myapp.core) but same effect. When I paste web app handler straight on repl and serve then it works, but not from my file.
 

calling myapp or myapp-handler clearly gives the "object" so I should really be on right namespace...
 

project.clj
 

(defproject myapp "1.0.0-SNAPSHOT"
  :description "FIXME: write description"
  :dependencies [
        [org.clojure/clojure "1.2.1"]
        [compojure "0.6.2"]
        ]
  :dev-dependencies [
            [appengine-magic "0.4.1"]
            [ring/ring-devel "0.3.7"]
            ])

 

core.clj is as just simple:
 

(ns myapp.core
    (:use compojure.core)
    (:require [appengine-magic.core :as ae]))

(defroutes myapp-handler
    (GET "/" req
       {:status 200
        :headers {"Content-Type" "text/plain"}
        :body "Hello, world!!!"}))

(ae/def-appengine-app myapp #'myapp-handler)


原文：https://stackoverflow.com/questions/5558423
更新时间：2022-11-02 18:11

最满意答案

 我不确定这个查询的性能，但是因为我努力写了它，所以无论如何我都会发布它... 
 

;with aaa(tel)
as
(
select Tel1
from Destination
union
select Tel2
from Destination
union
select Tel3
from Destination
)
,bbb(tel, id)
as
(
select Tel1, account_id
from ImportData
union
select Tel2, account_id
from ImportData
union
select Tel3, account_id
from ImportData
)

select distinct b.id
from bbb b
where b.tel in
(
select a.tel
from aaa a
intersect
select b2.tel
from bbb b2
)


I am not sure on the perforamance of this query, but since I made the effort of writing it I will post it anyway...
 

;with aaa(tel)
as
(
select Tel1
from Destination
union
select Tel2
from Destination
union
select Tel3
from Destination
)
,bbb(tel, id)
as
(
select Tel1, account_id
from ImportData
union
select Tel2, account_id
from ImportData
union
select Tel3, account_id
from ImportData
)

select distinct b.id
from bbb b
where b.tel in
(
select a.tel
from aaa a
intersect
select b2.tel
from bbb b2
)

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