java Logback 变量替换无法在类路径上找到属性文件
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/9935648/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
Logback variable substitution could not locate property file on the classpath
提问by scabbage
I really like Logback's support to log into a DB. However, I'm having trouble using Logback's variable substitution feature, more specifically, from a property file on the classpath.
我真的很喜欢 Logback 对登录数据库的支持。但是，我在使用 Logback 的变量替换功能时遇到了问题，更具体地说，是从类路径上的属性文件中。
My reference: http://logback.qos.ch/manual/configuration.html#variableSubstitution
我的参考：http: //logback.qos.ch/manual/configuration.html#variableSubstitution
So I have a multi-module Maven project. In my web module (which generates a .war file), I have my Logback conf files in the following dir:
所以我有一个多模块 Maven 项目。在我的 Web 模块（生成 .war 文件）中，我的 Logback conf 文件位于以下目录中：
src/main/resources
- logback.xml
- local.properties
- dev.properties
My logback.xml file looks like this:
我的 logback.xml 文件如下所示：
<?xml version="1.0" encoding="UTF-8"?>
<configuration>
<property file="${env}.properties"/>
<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
<encoder>
<pattern>%d{HH:mm:ss.SSS} [%X{messageId}] %-5level %logger{0} - %msg%n
</pattern>
</encoder>
</appender>
<appender name="DB" class="ch.qos.logback.classic.db.DBAppender">
<connectionSource class="ch.qos.logback.core.db.DataSourceConnectionSource">
<dataSource class="com.mchange.v2.c3p0.ComboPooledDataSource">
<driverClass>${logback.db.driverClassName}</driverClass>
<jdbcUrl>${logback.db.url}</jdbcUrl>
<user>${logback.db.user}</user>
<password>${logback.db.password}</password>
</dataSource>
</connectionSource>
</appender>
<root level="debug">
<appender-ref ref="DB" />
</root>
</configuration>
So when I start my Tomcat server, I would pass in the ${env} like this:
因此，当我启动 Tomcat 服务器时，我会像这样传入 ${env}：
-Denv=local
However, I got the following error when I brought up the server:
但是，当我启动服务器时出现以下错误：
17:45:22,782 WARN com.mchange.v2.async.ThreadPoolAsynchronousRunner$PoolThread-#0 DriverManagerDataSource:107 - Could not load driverClass logback.db.driverClassName_IS_UNDEFINED
java.lang.ClassNotFoundException: logback.db.driverClassName_IS_UNDEFINED
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1678)
at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1523)
It looks like Logback Joran was having trouble locating the property file.
看起来 Logback Joran 在定位属性文件时遇到了问题。
Can anyone let me know what I did wrong?
谁能让我知道我做错了什么？
回答by scabbage
As I said in the comments:
正如我在评论中所说：
Should be:
应该：
<property resource="${env}.properties"/>
Not
不是
<property file="${env}.properties"/>
