[英]compilation error when referring to a library using maven
I am newbie to maven and i am having some trouble building my project. 我是Maven的新手,在构建项目时遇到了一些麻烦。 i have added the log4j dependency to the pom file
我已经将log4j依赖项添加到pom文件中
<dependency>
<groupId>log4j</groupId>
<artifactId>log4j</artifactId>
<version>1.2.16</version>
<scope>runtime</scope>
</dependency>
and i am using it in a normal use in one of my classes 我在一堂课中正常使用它
import org.apache.log4j.Logger;
public class ConnectionPoolImpl implements Runnable, ConnectionPool {
static Logger logger = Logger.getLogger(ConnectionPoolImpl.class);
the compilation went well until i have used the mvn clean command. 直到我使用mvn clean命令为止,编译过程都进行顺利。 now when i try to build my project using mvn compile i am getting:
现在,当我尝试使用mvn compile构建项目时,我得到:
[INFO] Compiling 2 source files to C:\Temp\cp\target\classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] \Temp\cp\src\main\java\com\opower\connectionpool\ConnectionPoolImpl.java
:[9,23] package org.apache.log4j does not exist
[ERROR] \Temp\cp\src\main\java\com\opower\connectionpool\ConnectionPoolImpl.java
:[19,9] cannot find symbol
symbol : class Logger
location: class com.opower.connectionpool.ConnectionPoolImpl
[ERROR] \Temp\cp\src\main\java\com\opower\connectionpool\ConnectionPoolImpl.java
:[19,25] cannot find symbol
symbol : variable Logger
location: class com.opower.connectionpool.ConnectionPoolImpl
[INFO] 3 errors
any ideas what i am doing wrong? 任何想法我在做什么错?
I am not a Maven
specialist, but the log4j
scope should be compile
instead of runtime
. 我不是
Maven
专家,但是log4j
范围应该是compile
而不是runtime
。 Please correct me if I am wrong. 如果我错了,请纠正我。
From maven doc , 从maven doc中 ,
runtime - this scope indicates that the dependency is not required for compilation, but is for execution.
运行时-此作用域指示依赖关系不是编译所必需的,而是执行所必需的。 It is in the runtime and test classpaths, but not the compile classpath.
它在运行时和测试类路径中,但不在编译类路径中。
If you had the scope as runtime
, the original intention likely was to use SLF4J or somesuch instead. 如果您将范围用作
runtime
,则最初的意图可能是使用SLF4J或类似的东西。 Very easy to import the wrong namespace for Logger
. 为
Logger
导入错误的名称空间非常容易。
使用编译范围,仍然使罐子陷入了战争。
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