包冲突
1.使用maven管理项目时可能会遇到包冲突的情况比如:log4j-over-slf4j.jar 和 slf4j-log4j12.jar这两个包同时一起运行时就会有问题。
2.这种冲突可能是显式依赖导致,也可能是隐式依赖导致。
显式依赖,直接可以从pom.xml文件的<dependency>中看到两个冲突包的引用。
隐式依赖,在pom.xml的<dependency>无法看到冲突的包,而是由<dependency>引入的包间接引入的。
解决
先确认哪些依赖间接引入了包。使用mvn dependency:tree查看整个项目的依赖树,这里能看到所有的依赖,包括间接依赖。
结果类似如下:
[INFO] +- junit:junit:jar:4.12:test [INFO] | \- org.hamcrest:hamcrest-core:jar:1.3:test [INFO] +- org.apache.storm:storm-core:jar:1.0.2:provided [INFO] | +- com.esotericsoftware:kryo:jar:3.0.3:compile [INFO] | | \- com.esotericsoftware:minlog:jar:1.3.0:compile [INFO] | +- org.clojure:clojure:jar:1.7.0:provided [INFO] | +- com.lmax:disruptor:jar:3.3.2:provided [INFO] | +- org.apache.logging.log4j:log4j-api:jar:2.1:provided [INFO] | +- org.apache.logging.log4j:log4j-core:jar:2.1:provided [INFO] | +- org.apache.logging.log4j:log4j-slf4j-impl:jar:2.1:provided [INFO] | +- org.slf4j:log4j-over-slf4j:jar:1.6.6:provided [INFO] | +- javax.servlet:servlet-api:jar:2.5:provided [INFO] | \- org.slf4j:slf4j-api:jar:1.7.7:compile [INFO] +- com.aaa.khala:aaa-khala-insight-sdk-transfer-api:jar:1.0.0-SNAPSHOT:compile [INFO] | \- com.aaa.khala:aaa-khala-common:jar:1.0.0-SNAPSHOT:compile [INFO] | +- javax.mail:javax.mail-api:jar:1.5.5:compile [INFO] | +- cglib:cglib:jar:2.2.2:compile [INFO] | +- org.aspectj:aspectjrt:jar:1.7.4:compile [INFO] | +- org.aspectj:aspectjweaver:jar:1.7.4:runtime [INFO] | +- org.javassist:javassist:jar:3.20.0-GA:compile [INFO] | +- log4j:log4j:jar:1.2.17:compile [INFO] | +- org.slf4j:slf4j-log4j12:jar:1.7.7:compile [INFO] | +- dom4j:dom4j:jar:1.6.1:compile [INFO] | +- jaxen:jaxen:jar:1.1.6:compile [INFO] | +- commons-collections:commons-collections:jar:3.2.1:compile [INFO] | +- commons-codec:commons-codec:jar:1.9:compile [INFO] | +- commons-beanutils:commons-beanutils:jar:1.9.2:compile [INFO] | +- org.apache.commons:commons-compress:jar:1.6:compile [INFO] | | \- org.tukaani:xz:jar:1.4:compile
查到冲突包对应的依赖,在pom.xml的<dependency>中配置排除,就不会引入该包了,例如:
<dependency> <groupId>com.aaa.khala</groupId> <artifactId>aaa-khala-insight-sdk-transfer-api</artifactId> <version>1.0.0-SNAPSHOT</version> <exclusions> <exclusion> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> </exclusion> </exclusions> </dependency>
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