[英]Using slf4j + log4j with dropwizard
我有一个用Maven构建的REST Java应用程序。 它由一个带有两个模块的项目组成:
这是父POM:
<?xml version="1.0" encoding="UTF-8"?>
<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>org.sample</groupId>
<artifactId>myapp_server</artifactId>
<version>0.0.1</version>
<packaging>pom</packaging>
<name>myapp_server</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<slf4j.version>1.7.25</slf4j.version>
</properties>
<dependencies>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
<version>3.8.1</version>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
<version>${slf4j.version}</version>
<scope>compile</scope>
</dependency>
</dependencies>
<repositories>
<repository>
<id>central</id>
<url>http://repo1.maven.org/maven2</url>
</repository>
</repositories>
<modules>
<module>myapp_rest</module>
<module>myapp_logging</module>
</modules>
</project>
这是myapp_rest
的POM(使用dropwizard中的java-simple原型创建):
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/maven-v4_0_0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<artifactId>myapp_server</artifactId>
<groupId>org.sample</groupId>
<version>0.0.1</version>
</parent>
<prerequisites>
<maven>3.0.0</maven>
</prerequisites>
<groupId>org.sample</groupId>
<artifactId>myapp_rest</artifactId>
<packaging>jar</packaging>
<name>REST layer</name>
<description>REST layer</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
<dropwizard.version>1.3.5</dropwizard.version>
<mainClass>org.sample.rest.Application</mainClass>
</properties>
<dependencies>
<dependency>
<groupId>io.dropwizard</groupId>
<artifactId>dropwizard-core</artifactId>
<version>${dropwizard.version}</version>
<exclusions>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-api</artifactId>
</exclusion>
<exclusion>
<groupId>org.slf4j</groupId>
<artifactId>log4j-over-slf4j</artifactId>
</exclusion>
<exclusion>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>lo4j-slf4j-impl</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.sample</groupId>
<artifactId>myapp_logging</artifactId>
<version>0.0.1</version>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.1</version>
<configuration>
<createDependencyReducedPom>true</createDependencyReducedPom>
<transformers>
<transformer
implementation="org.apache.maven.plugins.shade.resource.ServicesResourceTransformer" />
<transformer
implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>${mainClass}</mainClass>
</transformer>
</transformers>
<!-- exclude signed Manifests -->
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
</configuration>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-jar-plugin</artifactId>
<version>3.0.2</version>
<configuration>
<archive>
<manifest>
<addClasspath>true</addClasspath>
<mainClass>${mainClass}</mainClass>
</manifest>
</archive>
</configuration>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.6.1</version>
<configuration>
<source>1.8</source>
<target>1.8</target>
</configuration>
</plugin>
<plugin>
<artifactId>maven-source-plugin</artifactId>
<version>3.0.1</version>
<executions>
<execution>
<id>attach-sources</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-javadoc-plugin</artifactId>
<version>3.0.0-M1</version>
<executions>
<execution>
<id>attach-javadocs</id>
<goals>
<goal>jar</goal>
</goals>
</execution>
</executions>
</plugin>
</plugins>
</build>
<reporting>
<plugins>
<plugin>
<artifactId>maven-project-info-reports-plugin</artifactId>
<version>2.8.1</version>
<configuration>
<dependencyLocationsEnabled>false</dependencyLocationsEnabled>
<dependencyDetailsEnabled>false</dependencyDetailsEnabled>
</configuration>
</plugin>
<plugin>
<artifactId>maven-javadoc-plugin</artifactId>
<version>2.10.3</version>
</plugin>
</plugins>
</reporting>
</project>
这是myapp_logging
的POM:
<?xml version="1.0"?>
<project
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd"
xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.sample</groupId>
<artifactId>myapp_server</artifactId>
<version>0.0.1</version>
</parent>
<groupId>org.sample</groupId>
<artifactId>myapp_logging</artifactId>
<name>myapp_logging</name>
<url>http://maven.apache.org</url>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<log4j.version>2.11.0</log4j.version>
</properties>
<dependencies>
<dependency> <!-- slf4j -> log4j bridge
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-slf4j-impl</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-api</artifactId>
<version>${log4j.version}</version>
</dependency>
<dependency>
<groupId>org.apache.logging.log4j</groupId>
<artifactId>log4j-core</artifactId>
<version>${log4j.version}</version>
</dependency>
</dependencies>
</project>
我想使所有日志都通过slf4j
以便使用log4j
进行日志记录。 Dropwizard在内部使用了logback,因此我试图使其改用slf4j。
如果运行此项目,则会得到以下输出:
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/home/user/.m2/repository/ch/qos/logback/logback-classic/1.2.3/logback-classic-1.2.3.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/home/user/.m2/repository/org/apache/logging/log4j/log4j-slf4j-impl/2.11.0/log4j-slf4j-impl-2.11.0.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [ch.qos.logback.classic.util.ContextSelectorStaticBinder]
看来slf4j可以正确地从日志记录模块中看到log4j了,但是它也在考虑logback-classic
的绑定器,它是dropwizard内部的一个依赖项。
如果我排除logback-classic
的logback-classic
包, logback-classic
此错误:
Exception in thread "main" java.lang.NoClassDefFoundError: ch/qos/logback/classic/Level
at io.dropwizard.Application.bootstrapLogLevel(Application.java:33)
at io.dropwizard.Application.bootstrapLogging(Application.java:38)
at io.dropwizard.Application.<init>(Application.java:26)
at org.sample.rest.Application.<init>(Application.java:10)
at org.sample.rest.Application.main(Application.java:15)
Caused by: java.lang.ClassNotFoundException: ch.qos.logback.classic.Level
at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349)
at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
... 5 more
通过单击类名,它会将我重定向到io.dropwizard.Application
类,该类包含对ch.qos.logback.classic.Level
的引用,因此无法安全删除logback包。
我已经看到log4j有一个“反向桥”,它可以让您将所有调用代理到slf4j(log4j-over-slf4j),但似乎没有等效的logback。
有没有办法摆脱注销并通过带有dropwizard的slf4j使用任何其他框架?
实际上有一个关于如何摆脱Logback的Dropwizard文档: https ://dropwizard.readthedocs.io/en/stable/manual/core.html#logging
阅读黄色的注释(在错误级别的正下方),它告诉您该怎么做。 希望能帮助到你!
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