java org.apache.log4j.Logger 无法解决尽管 Maven 依赖
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org.apache.log4j.Logger cannot be resolved inspite of Maven dependencies
提问by Tom
I am using maven (i.e. maven plugin for eclipse) for dependency management and generally it works. E.g. jasypt gets strong textresolved and I can use it without any problem. However when trying to use Log4J I get issues like "The import org.apache.log4j cannot be resolved" even though I followed the exact steps as desribed on http://logging.apache.org/log4j/2.x/maven-artifacts.html.
我正在使用 maven（即 eclipse 的 maven 插件）进行依赖管理，通常它可以工作。例如 jasypt 可以解析强文本，我可以毫无问题地使用它。但是，在尝试使用 Log4J 时，即使我按照http://logging.apache.org/log4j/2.x/maven-工件.html。
There it says I need to include the following snippet into my pom.xml
它说我需要将以下代码段包含到我的 pom.xml 中
<dependencies>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.6.2</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.6.2</version>
</dependency>
</dependencies>
However exactly that is included in my pom.xml as given below in my full pom.xml. Does that make sense to anyone? I also tried replacing the two dependencies with the following however without any success
但是，正如下面在我的完整 pom.xml 中给出的那样，它确实包含在我的 pom.xml 中。这对任何人都有意义吗？我还尝试用以下内容替换两个依赖项，但没有成功
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j</artifactId>
<version>2.6.2</version>
<type>pom</type>
</dependency>
Cheers Tom
干杯汤姆
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>PCenter</groupId>
<artifactId>PCenter</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>PCenter</name>
<build>
<sourceDirectory>src</sourceDirectory>
<resources>
<resource>
<directory>src</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
<resource>
<directory>ejbModule</directory>
<excludes>
<exclude>**/*.java</exclude>
</excludes>
</resource>
</resources>
<plugins>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.5.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-war-plugin</artifactId>
<version>2.6</version>
<configuration>
<warSourceDirectory>WebContent</warSourceDirectory>
<failOnMissingWebXml>false</failOnMissingWebXml>
</configuration>
</plugin>
</plugins>
</build>
<dependencies>
<dependency>
<groupId>com.paypal.sdk</groupId>
<artifactId>rest-api-sdk</artifactId>
<version>1.9.2</version>
</dependency>
<dependency>
<groupId>org.jasypt</groupId>
<artifactId>jasypt</artifactId>
<version>1.9.2</version>
</dependency>
<dependency>
<groupId>org.apache.axis</groupId>
<artifactId>axis</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>org.apache.axis</groupId>
<artifactId>axis-jaxrpc</artifactId>
<version>1.4</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>2.6.2</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>2.6.2</version>
</dependency>
</dependencies>
</project>
回答by ppeterka
The problem is that you have Log4j2 in the dependencies, and use the older, Log4j 1.2.x API.
问题是您的依赖项中有 Log4j2，并使用较旧的 Log4j 1.2.x API。
Either depend on Log4j 1.2.x
<dependencies> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> </dependencies>Or use the correct API calls for Log4j 2.x:
要么依赖于 Log4j 1.2.x
<dependencies> <dependency> <groupId>log4j</groupId> <artifactId>log4j</artifactId> <version>1.2.17</version> </dependency> </dependencies>或者对 Log4j 2.x 使用正确的 API 调用：
Calls to
org.apache.log4j.Logger.getLogger()must be modified toorg.apache.logging.log4j.LogManager.getLogger()
调用
org.apache.log4j.Logger.getLogger()必须修改为org.apache.logging.log4j.LogManager.getLogger()
(From Migrating from Log4j 1.x)
（来自从 Log4j 1.x 迁移）
回答by Arturas M
Hmm, actually I tried ppeterkas suggested solution with including that older 1.2x api, but that didn't work for me, I still had that problem. And since the code which could not be compiled was not really my code but rather some open source code that I happened to be using in my own code, I didn't really want to modify it's loggers (I should also mention, that I just started having this problem after newly opening my eclipse on a new computer, before it was actually compiling fine with the same pom.xml, so that's weird, but nevertheless it still needed fixing then...).
嗯，实际上我尝试了 ppeterkas 建议的解决方案，包括那个较旧的 1.2x api，但这对我不起作用，我仍然遇到那个问题。而且由于无法编译的代码实际上并不是我的代码，而是我在自己的代码中碰巧使用的一些开源代码，因此我并不是真的想修改它的记录器（我还应该提一下，我只是在新计算机上新打开我的 eclipse 后开始遇到这个问题，在它实际上用相同的 pom.xml 编译之前，这很奇怪，但它仍然需要修复然后......）。
So a solution for me was to include an Apache Log4j 1.x Compatibility API for log4j 2.7:
因此，我的解决方案是为 log4j 2.7 包含一个 Apache Log4j 1.x 兼容性 API：
http://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-1.2-api/2.7
http://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-1.2-api/2.7
<!-- https://mvnrepository.com/artifact/org.apache.logging.log4j/log4j-1.2-api -->
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-1.2-api</artifactId>
<version>2.7</version>
</dependency>
Hope this will help other people having the same problem.
希望这会帮助其他有同样问题的人。
