彻底解决maven项目中jackson编译报错，提示Failure to find com.fasterxml.jackson:jackson-bom:pom

今天在架构改造中发现，原来eclipse项目中使用了jackson依赖，编译不报错而且不会提示缺少jackson-bom.jar。在新的springboot2.1.4的项目中发现报错，错误消息如下：

org.apache.maven.plugins:maven-clean-plugin:3.1.0:clean
[INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] Non-resolvable import POM: Failure to find com.fasterxml.jackson:jackson-bom:pom:1.9.9 in http://maven.aliyun.com/nexus/content/groups/public/ was cached in the local repository, resolution will not be reattempted until the update interval of aliyun has elapsed or updates are forced @ org.springframework.boot:spring-boot-dependencies:2.1.4.RELEASE, C:\Users\renkai721\.m2\repository\org\springframework\boot\spring-boot-dependencies\2.1.4.RELEASE\spring-boot-dependencies-2.1.4.RELEASE.pom, line 605, column 13
 @ 
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]   

 

操作剖析：

1、我们常规的使用方式如下，现在顶部定义一个版本

	1.9.9

2、在dependency中使用方式如下，这样就会报错。

			org.codehaus.jackson
			jackson-core-lgpl
			${jackson.version}
		
		
			org.codehaus.jackson
			jackson-core-asl
			${jackson.version}
		
		
			org.codehaus.jackson
			jackson-mapper-lgpl
			${jackson.version}
		
		
			org.codehaus.jackson
			jackson-mapper-asl
			${jackson.version}
		

 

 

解决方法如下：

1、删除顶部定义的版本，直接写在version中。正确的写法如下

			org.codehaus.jackson
			jackson-core-lgpl
			1.9.9
		
		
			org.codehaus.jackson
			jackson-core-asl
			1.9.9
		
		
			org.codehaus.jackson
			jackson-mapper-lgpl
			1.9.9
		
		
			org.codehaus.jackson
			jackson-mapper-asl
			1.9.9
		

2、重新clean，试一试。