An attempt was made to call the method xxx but it does not exist

场景

在公司项目中做配置迁移的时候，服务启动时报错

报错信息

Description:An attempt was made to call the method redis.clients.jedis.Jedis.<init>(Ljava/lang/String;IIIZLjavax/net/ssl/SSLSocketFactory;Ljavax/net/ssl/SSLParameters;Ljavax/net/ssl/HostnameVerifier;)V but it does not exist. Its class, redis.clients.jedis.Jedis, is available from the following locations:jar:file:/home/work/one-front-callin/app/BOOT-INF/lib/jedis-2.8.0.jar!/redis/clients/jedis/Jedis.classIt was loaded from the following location:jar:file:/home/work/one-front-callin/app/BOOT-INF/lib/jedis-2.8.0.jar!/Action:Correct the classpath of your application so that it contains a single, compatible version of redis.clients.jedis.Jedis

这种问题一看就是maven引入第三方依赖版本冲突或不匹配相关的问题，该问题导致这个springboot服务启动报错，其实这种报错还是看上去比较舒服的，这个报错提示是非常到位，咱们试着理解下这个报错提示

分三步部分解读报错

1、您的应用程序尝试调用 redis.clients.jedis.Jedis 类的构造函数，该构造函数的参数类型依次为java.lang.String、javax.net.ssl.SSLSocketFactory，javax.net.ssl.SSLParameters， javax.net.ssl.HostnameVerifier（<init>是构造函数的意思，是构造函数的字节码写法），但该构造函数不存在

An attempt was made to call the method redis.clients.jedis.Jedis.<init>(Ljava/lang/String;IIIZLjavax/net/ssl/SSLSocketFactory;Ljavax/net/ssl/SSLParameters;Ljavax/net/ssl/HostnameVerifier;)V but it does not exist

该构造函数不存在？是jar包冲突了吗？带着这些问题继续读第二部分的报错信息

2、该构造器所在的类redis.clients.jedis.Jedis，存在于/home/work/one-front-callin/app/BOOT-INF/lib/jedis-2.8.0.jar!/redis/clients/jedis/Jedis.class，被加载的位置是/home/work/one-front-callin/app/BOOT-INF/lib/jedis-2.8.0.jar!/，也就是说我们所部署的项目中有且只有一个jedis相关的jar包的，经排查发现项目中确实只有一个2.8.0的jedis jar包，所以可以断定这并非是项目中存在多个jedis jar包导致冲突的

 Its class, redis.clients.jedis.Jedis, is available from the following locations:jar:file:/home/work/one-front-callin/app/BOOT-INF/lib/jedis-2.8.0.jar!/redis/clients/jedis/Jedis.classIt was loaded from the following location:jar:file:/home/work/one-front-callin/app/BOOT-INF/lib/jedis-2.8.0.jar!/

3、这是报错中给的解决该问题的建议，建议我们纠正应用程序即jedis的类路径，使其包含redis.clients.jedi .jedis的单一兼容版本

Action:Correct the classpath of your application so that it contains a single, compatible version of redis.clients.jedis.Jedis

个人理解就是项目中调用redis.clients.jedis.Jedis的版本和我们当前这个2.8版本不一样，所以调用redis.clients.jedis.Jedis的构造器时无法从2.8版本中的redis.clients.jedis.Jedis中匹配到要调用的这个构造器

redis.clients.jedis.Jedis.<init>(Ljava/lang/String;IIIZLjavax/net/ssl/SSLSocketFactory;Ljavax/net/ssl/SSLParameters;Ljavax/net/ssl/HostnameVerifier;)V