使用Q节点模块时，Bluemix node.js应用程序部署失败

Question

我正在使用Bluemix部署示例node.js应用程序。如果我的应用程序代码中不需要Q包，一切都很好。但是，如果我在代码中需要Q包，应用程序部署就会失败。

这是我的应用程序代码-

/*eslint-env node*/
var express = require('express'),
    cfenv = require('cfenv'),
    //bodyParser = require('body-parser'),
    //multer = require('multer'),
    Q = require('Q');
var app = express();
app.set('view engine', 'pug');
app.use(express.static(__dirname + '/views'));
app.get('/', function (req, res) {
    res.render('index');
});
app.listen(appEnv.port, '0.0.0.0', function() {
  console.log("server starting on " + appEnv.url);
});

然而，当我检查日志时，Q模块确实已安装，如下所示。

├── q@1.4.1

Bluemix部署日志-

2016-05-03T00:30:05.46+0530 [App/0]      ERR module.js:328
2016-05-03T00:30:05.46+0530 [App/0]      ERR     throw err;
2016-05-03T00:30:05.46+0530 [App/0]      ERR     ^
2016-05-03T00:30:05.46+0530 [App/0]      ERR Error: Cannot find module 'Q'
2016-05-03T00:30:05.46+0530 [App/0]      ERR     at Function.Module._resolveFilename (module.js:326:15)
2016-05-03T00:30:05.46+0530 [App/0]      ERR     at Function.Module._load (module.js:277:25)
2016-05-03T00:30:05.46+0530 [App/0]      ERR     at Module.require (module.js:354:17)
2016-05-03T00:30:05.46+0530 [App/0]      ERR     at require (internal/module.js:12:17)
2016-05-03T00:30:05.46+0530 [App/0]      ERR     at Object.<anonymous> (/home/vcap/app/app.js:6:9)
2016-05-03T00:30:05.46+0530 [App/0]      ERR     at Module._compile (module.js:410:26)
2016-05-03T00:30:05.46+0530 [App/0]      ERR     at Object.Module._extensions..js (module.js:417:10)
2016-05-03T00:30:05.46+0530 [App/0]      ERR     at Module.load (module.js:344:32)
2016-05-03T00:30:05.46+0530 [App/0]      ERR     at Function.Module._load (module.js:301:12)
2016-05-03T00:30:05.46+0530 [App/0]      ERR     at Function.Module.runMain (module.js:442:10)
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! Linux 3.19.0-25-generic
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! argv "/home/vcap/app/vendor/node/bin/node" "/home/vcap/app/vendor/node/bin/npm" "start"
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! node v4.2.6
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! npm  v2.14.12
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! code ELIFECYCLE
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! SampleNodeApp@0.0.1 start: `node app.js`
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! Exit status 1
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! 
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! Failed at the SampleNodeApp@0.0.1 start script 'node app.js'.
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! This is most likely a problem with the SampleNodeApp package,
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! not with npm itself.
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! Tell the author that this fails on your system:
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR!     node app.js
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! You can get their info via:
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR!     npm owner ls SampleNodeApp
2016-05-03T00:30:05.48+0530 [App/0]      ERR npm ERR! There is likely additional logging output above.
2016-05-03T00:30:05.49+0530 [App/0]      ERR npm ERR! Please include the following file with any support request:
2016-05-03T00:30:05.49+0530 [App/0]      ERR npm ERR!     /home/vcap/app/npm-debug.log
2016-05-03T00:30:05.56+0530 [DEA/137]    ERR Instance (index 0) failed to start accepting connections

注意：如果我删除行Q = require('Q')，一切正常，应用程序将成功部署和启动。此外，我已经在我的机器上进行了本地测试，它运行得非常好。

有什么建议或解决方案吗？谢谢

Answer 1

尝试以下代码：

var Q = require('q');

q模块的名称是q，而不是Q。

Answer 2

问题的关键是这个错误：

Error: Cannot find module 'Q'

模块的名称不是Q，而是q。更改该值将解决您的问题。