为什么 lift 找不到我的“db.properties”
在一个 lift 项目中，我将数据库配置放在一个名为 db.properties 的文件中
/src/main/resources/db.properties
，在我的 Boot.scala 中，我将其读为：
val input = this.getClass.getResourceAsStream("db.properties")
println("### input: " +input)
val db = new java.util.Properties
db.load(input)
val url = db.getProperty("url")
println("#### url:" + url)
然后我启动 sbt：
sbt prepare-web jetty-start
控制台打印一些错误：
### input: null
21:48:55.906 [main] ERROR n.liftweb.http.provider.HTTPProvider - Failed to Boot! Your application may not run properly
java.lang.NullPointerException: null
at java.util.Properties$LineReader.readLine(Properties.java:418) ~[na:1.6.0_27]
at java.util.Properties.load0(Properties.java:337) ~[na:1.6.0_27]
at java.util.Properties.load(Properties.java:325) ~[na:1.6.0_27]
at bootstrap.liftweb.Boot.boot(Boot.scala:21) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.6.
奇怪的 lift 找不到 db.properties！
我检查了 target/webapp/WEB-INF/classes，并且 db.properties 就在那里！哪里错了？
In a lift project, I put the db configurations in a file called db.properties
/src/main/resources/db.properties
And in my Boot.scala, I read it as:
val input = this.getClass.getResourceAsStream("db.properties")
println("### input: " +input)
val db = new java.util.Properties
db.load(input)
val url = db.getProperty("url")
println("#### url:" + url)
Then I start sbt:
sbt prepare-web jetty-start
The console prints some errors:
### input: null
21:48:55.906 [main] ERROR n.liftweb.http.provider.HTTPProvider - Failed to Boot! Your application may not run properly
java.lang.NullPointerException: null
at java.util.Properties$LineReader.readLine(Properties.java:418) ~[na:1.6.0_27]
at java.util.Properties.load0(Properties.java:337) ~[na:1.6.0_27]
at java.util.Properties.load(Properties.java:325) ~[na:1.6.0_27]
at bootstrap.liftweb.Boot.boot(Boot.scala:21) ~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:1.6.
It's strange lift can't find the db.properties!
I've checked target/webapp/WEB-INF/classes, and db.properties is there! Where is wrong?
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评论（1）
您发布的代码应该可以工作 - 您可以尝试
val input = getClass.getResourceAsStream("/db.properties")或者您可以尝试内置的 Lift Props meccano：
http://www.assembla.com/wiki/show/liftweb/Properties
如果您使用 Mapper（= Lift 附带的持久性框架），您可能会看看：
http://www.assembla.com/spaces/liftweb/wiki/Mapper
如果一切都失败了 - 询问友好的电梯社区：
http://groups.google.com/group/liftweb
希望有帮助
保罗
The code you posted should work - you might try
val input = getClass.getResourceAsStream("/db.properties")Alternatively you might try the built-in Lift Props meccano:
http://www.assembla.com/wiki/show/liftweb/Properties
If you use Mapper (= persistence framework that comes with Lift) you might have a look at:
http://www.assembla.com/spaces/liftweb/wiki/Mapper
If everything fails - ask the friendly lift community:
http://groups.google.com/group/liftweb
Hope that helps
Paul