spring-boot-starter-amqp 依赖导致 ***Error

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【中文标题】spring-boot-starter-amqp 依赖导致 ***Error【英文标题】:spring-boot-starter-amqp dependency causes ***Error 【发布时间】:2017-05-12 21:34:02 【问题描述】:

我有一个基本的 Spring Boot 项目,我尝试使用 RabbitMQ 实现简单的消息传递。当我将 spring-boot-starter-amqp 依赖项添加到我的 pom.xml 文件并启动 Spring Boot 应用程序时,我得到由 java.lang.***Error 引起的 java.lang.reflect.InvocationTargetException 异常:

Exception in thread "main" java.lang.reflect.InvocationTargetException
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:498)
    at org.springframework.boot.loader.MainMethodRunner.run(MainMethodRunner.java:48)
    at org.springframework.boot.loader.Launcher.launch(Launcher.java:87)
    at org.springframework.boot.loader.Launcher.launch(Launcher.java:50)
    at org.springframework.boot.loader.JarLauncher.main(JarLauncher.java:58)
Caused by: java.lang.***Error
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:280)
    at org.apache.log4j.Category.<init>(Category.java:57)
    at org.apache.log4j.Logger.<init>(Logger.java:37)
    at org.apache.log4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:43)
    at org.apache.log4j.LogManager.getLogger(LogManager.java:45)
    at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:63)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:281)
    at org.apache.log4j.Category.<init>(Category.java:57)
    at org.apache.log4j.Logger.<init>(Logger.java:37)
    at org.apache.log4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:43)
    at org.apache.log4j.LogManager.getLogger(LogManager.java:45)
    at org.slf4j.impl.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:63)
    at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:281)
    at org.apache.log4j.Category.<init>(Category.java:57)
    at org.apache.log4j.Logger.<init>(Logger.java:37)

pom.xml

<?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>rabbitmq.client</groupId>
    <artifactId>rabbitmqFstClient</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>rabbitmqFstClient</name>
    <description>Spring-Boot rabbitmq client</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.4.2.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-thymeleaf</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework</groupId>
            <artifactId>spring-jms</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.integration</groupId>
            <artifactId>spring-integration-jms</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-amqp</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.apache.activemq/activemq-all -->
        <dependency>
            <groupId>org.apache.activemq</groupId>
            <artifactId>activemq-all</artifactId>
            <version>5.14.2</version>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>


</project>

如果我从 pom.xml 中删除 spring-boot-starter-amqp 依赖项,则项目可以正常运行:

<dependency>
     <groupId>org.springframework.boot</groupId>
     <artifactId>spring-boot-starter-amqp</artifactId>
</dependency>

【问题讨论】:

【参考方案1】:

我不确定它是否能解决您的问题,但您仍然存在潜在的冲突,因为根据日志您拉取了 log4J 依赖项。 如果这样做,则必须排除声明时默认提供的 logback:

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>

您可以通过显示项目的依赖树并查看 org.springframework.boot:spring-boot-starter-web:jar 依赖拉取的内容来检查它:

[INFO] +- org.springframework.boot:spring-boot-starter-web:jar:1.4.0.RELEASE:compile
[INFO] | +- org.springframework.boot:spring-boot-starter:jar:1.4.0.RELEASE:compile
[INFO] | | +- org.springframework.boot:spring-boot-starter-logging:jar:1.4.0.RELEASE:compile
[INFO] | | | +- ch.qos.logback:logback-classic:jar:1.1.7:compile
[INFO] | | | | +- ch.qos.logback:logback-core:jar:1.1.7:compile
[INFO] | | | | \- org.slf4j:slf4j-api:jar:1.7.21:compile
[INFO] | | | +- org.slf4j:jcl-over-slf4j:jar:1.7.21:compile
[INFO] | | | +- org.slf4j:jul-to-slf4j:jar:1.7.21:compile
[INFO] | | | \- org.slf4j:log4j-over-slf4j:jar:1.7.21:compile
[INFO] | | \- org.yaml:snakeyaml:jar:1.17:runtime

Spring Boot 声明如果它在类路径上,它支持 Log4j 2 用于日志记录配置。如果您使用启动器来组装依赖项,则意味着您必须排除 Logback,然后再包含 log4j 2。

所以要仅使用 log4j,您可以从 spring-boot-starter-web 依赖项中排除 Logback:

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
        <exclusions>
            <exclusion>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-starter-logging</artifactId>
            </exclusion>
        </exclusions>
    </dependency>

或者仅使用 logback,您应该排除可能由您声明的其他依赖项之一拉取的 log4j。 使用:来自 Maven 项目的mvn dependency:tree 来了解罪魁祸首。

但无论如何,你不应该同时使用两者。

【讨论】:

【参考方案2】:

如果您打算通过 RabbitMQ 使用 AMQP,则删除所有 JMS 依赖项。

另外,对于一个简单的应用程序,您也不需要 Spring Integration。仅使用 spring-boot-starter-amqp

尝试您的应用程序

【讨论】:

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