[Java知识库]elastic-job-lite因为guava版本不同启动报错

最近项目需要使用elastic-job-lite来完成定时任务功能

引入对应的jar包后，包括guava 20.0版本。每次项目启动后报错：

com.google.common.util.concurrent.MoreExecutors.sameThreadExecutor()Lcom/google/common/util/concurrent/ListeningExecutorService

具体报错信息如下：

***************************
APPLICATION FAILED TO START
***************************

Description:

An attempt was made to call a method that does not exist. The attempt was made from the following location:

    org.apache.curator.framework.listen.ListenerContainer.addListener(ListenerContainer.java:41)

The following method did not exist:

    com.google.common.util.concurrent.MoreExecutors.sameThreadExecutor()Lcom/google/common/util/concurrent/ListeningExecutorService;

The method's class, com.google.common.util.concurrent.MoreExecutors, is available from the following locations:

    jar:file:/Users/dushan/.m2/repository/com/google/guava/guava/30.1-jre/guava-30.1-jre.jar!/com/google/common/util/concurrent/MoreExecutors.class

The class hierarchy was loaded from the following locations:

    com.google.common.util.concurrent.MoreExecutors: file:/Users/user/.m2/repository/com/google/guava/guava/30.1-jre/guava-30.1-jre.jar

其实根本原因就是因为java项目引入的jar包中，其中包含了多个版本的guava版本的jar包。

解决方法：
1.打开idea的terminal ,输入命令：查看jar包依赖

mvn dependency:tree

2.可以看到项目中guava版本：

2.根据这个依赖树，找到依赖guava包的jar包。
找到对应的jar包，配置maven的executions

对于我的项目而言，我是使用elastic-job-lite导致项目启动报错，并且报错的内容是guava的版本guava-30.1-jre.jar
那么我找到引用这个jar包的是nacos-client，解决方式如下

			<dependency>
            <groupId>com.alibaba.nacos</groupId>
            <artifactId>nacos-client</artifactId>
            <exclusions>
                <exclusion>
                    <groupId>com.google.guava</groupId>
                    <artifactId>guava</artifactId>
                </exclusion>
            </exclusions>
        </dependency>