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。在新的springboot2.1.4的项目中发现报错，错误消息如下：
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:maven-clean-plugin:3.1.0:clean
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[INFO] Scanning for projects...
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[ERROR] [ERROR] Some problems were encountered while processing the POMs:
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[ERROR] Non-resolvable import POM: Failure to find :jackson-bom:pom:1.9.9 in http:///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 @ :spring-boot-dependencies:2.1., C:\Users\renkai721\.m2\repository\org\springframework\boot\spring-boot-dependencies\2.1.\spring-boot-dependencies-2.1., line 605, column 13
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@
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[ERROR] The build could not read 1 project -> [Help 1]
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[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
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<properties>
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<>1.9.9</>
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</properties>
2、在dependency中使用方式如下，这样就会报错。
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<dependency>
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<groupId></groupId>
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<artifactId>jackson-core-lgpl</artifactId>
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<version>${}</version>
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</dependency>
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<dependency>
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<groupId></groupId>
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<artifactId>jackson-core-asl</artifactId>
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<version>${}</version>
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</dependency>
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<dependency>
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<groupId></groupId>
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<artifactId>jackson-mapper-lgpl</artifactId>
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<version>${}</version>
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</dependency>
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<dependency>
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<groupId></groupId>
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<artifactId>jackson-mapper-asl</artifactId>
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<version>${}</version>
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</dependency>
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
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<dependency>
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<groupId></groupId>
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<artifactId>jackson-core-lgpl</artifactId>
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<version>1.9.9</version>
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</dependency>
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<dependency>
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<groupId></groupId>
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<artifactId>jackson-core-asl</artifactId>
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<version>1.9.9</version>
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</dependency>
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<dependency>
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<groupId></groupId>
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<artifactId>jackson-mapper-lgpl</artifactId>
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<version>1.9.9</version>
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</dependency>
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<dependency>
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<groupId></groupId>
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<artifactId>jackson-mapper-asl</artifactId>
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<version>1.9.9</version>
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</dependency>
2、重新clean，试一试。