啟動springboot時報錯 APPLICATION FAILED TO START 包沖突

problem

具體日志如下

***************************
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.springframework.http.converter.json.Jackson2ObjectMapperBuilder.registerWellKnownModulesIfAvailable(Jackson2ObjectMapperBuilder.java:823)

The following method did not exist:

    com.fasterxml.jackson.databind.Module.getTypeId()Ljava/lang/Object;

The calling method's class, org.springframework.http.converter.json.Jackson2ObjectMapperBuilder, was loaded from the following location:

    jar:file:/Users/dream/.m2/repository/org/springframework/spring-web/5.3.13/spring-web-5.3.13.jar!/org/springframework/http/converter/json/Jackson2ObjectMapperBuilder.class

The called method's class, com.fasterxml.jackson.databind.Module, is available from the following locations:

    jar:file:/Users/dream/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.3.3/jackson-databind-2.3.3.jar!/com/fasterxml/jackson/databind/Module.class

The called method's class hierarchy was loaded from the following locations:

    com.fasterxml.jackson.databind.Module: file:/Users/dream/.m2/repository/com/fasterxml/jackson/core/jackson-databind/2.3.3/jackson-databind-2.3.3.jar


Action:

Correct the classpath of your application so that it contains compatible versions of the classes org.springframework.http.converter.json.Jackson2ObjectMapperBuilder and com.fasterxml.jackson.databind.Module


Process finished with exit code 1

reason

報錯日志的意思

• com.fasterxml.jackson.databind.Module.getTypeId 這個方法不存在
• 此方法對應(yīng)的一個類 json.Jackson2ObjectMapperBuilder 來自 spring-web-5.3.13.jar 包
• 此方法對應(yīng)的另一個類 jackson.databind.Module 來自 jackson-databind-2.3.3.jar

觀察maven依賴

• 正常項目的依賴是 spring-web-5.3.13.jar 和 jackson-databind-2.13.0.jar
• 異常項目的依賴是 spring-web-5.3.13.jar 和 jackson-databind-2.3.3.jar
• 可以看到是 第二個包的版本低了，導(dǎo)致出現(xiàn)了包沖突

對比pom文件

• 對比正常和異常項目，發(fā)現(xiàn)正常項目 springboot 依賴是來自parent節(jié)點
• 異常項目 springboot 依賴是pom中 自定義

solution

采用parent方式引入springboot可以解決問題

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