Maven dependency 包冲突解决方案

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在项目中加入依赖包后运行过程中出现包冲突问题。解决方案：

1. 在cmd环境下，输入如下命令：mvn dependency:tree,根据jar包的依赖树，通过依赖树找到冲突包的不同版本。如下所示：

发现 hbase 依赖包

org.slf4j:slf4j-api:jar:1.4.3

和storm 依赖包

 org.slf4j:slf4j-log4j12:jar

这两个包在项目中是有冲突的

[INFO] +- org.apache.hbase:hbase:jar:0.94.6:compile[INFO] |  +- com.yammer.metrics:metrics-core:jar:2.1.2:compile[INFO] |  +- commons-cli:commons-cli:jar:1.2:compile[INFO] |  +- org.mortbay.jetty:jsp-2.1:jar:6.1.14:compile[INFO] |  +- org.mortbay.jetty:jsp-api-2.1:jar:6.1.14:compile[INFO] |  +- org.mortbay.jetty:servlet-api-2.5:jar:6.1.14:compile[INFO] |  +- org.codehaus.jackson:jackson-core-asl:jar:1.8.8:compile[INFO] |  +- org.codehaus.jackson:jackson-mapper-asl:jar:1.8.8:compile[INFO] |  +- org.codehaus.jackson:jackson-jaxrs:jar:1.8.8:compile[INFO] |  +- org.codehaus.jackson:jackson-xc:jar:1.8.8:compile[INFO] |  +- org.slf4j:slf4j-api:jar:1.4.3:compile[INFO] |  +- tomcat:jasper-compiler:jar:5.5.23:compile

[INFO] +- storm:storm:jar:0.8.2:provided[INFO] |  +- org.clojure:clojure:jar:1.4.0:provided[INFO] |  +- commons-io:commons-io:jar:1.4:compile[INFO] |  +- org.apache.commons:commons-exec:jar:1.1:provided[INFO] |  +- storm:libthrift7:jar:0.7.0:provided[INFO] |  |  \- javax.servlet:servlet-api:jar:2.5:provided[INFO] |  +- clj-time:clj-time:jar:0.4.1:provided[INFO] |  |  \- joda-time:joda-time:jar:2.0:provided[INFO] |  +- log4j:log4j:jar:1.2.16:compile[INFO] |  +- com.netflix.curator:curator-framework:jar:1.0.1:provided[INFO] |  |  \- com.netflix.curator:curator-client:jar:1.0.1:provided[INFO] |  +- backtype:jzmq:jar:2.1.0:provided[INFO] |  +- com.googlecode.json-simple:json-simple:jar:1.1:provided[INFO] |  +- compojure:compojure:jar:1.1.3:provided[INFO] |  |  +- org.clojure:core.incubator:jar:0.1.0:provided[INFO] |  |  +- org.clojure:tools.macro:jar:0.1.0:provided[INFO] |  |  +- clout:clout:jar:1.0.1:provided[INFO] |  |  \- ring:ring-core:jar:1.1.5:provided[INFO] |  |     \- commons-fileupload:commons-fileupload:jar:1.2.1:provided[INFO] |  +- hiccup:hiccup:jar:0.3.6:provided[INFO] |  +- ring:ring-jetty-adapter:jar:0.3.11:provided[INFO] |  |  \- ring:ring-servlet:jar:0.3.11:provided[INFO] |  +- org.clojure:tools.logging:jar:0.2.3:provided[INFO] |  +- org.clojure:math.numeric-tower:jar:0.0.1:provided[INFO] |  +- org.slf4j:slf4j-log4j12:jar:1.5.8:compile

2.选定一个版本的包留下，在要去掉的依赖中 exclusion掉冲突jar

<dependency><groupId>storm</groupId><artifactId>storm</artifactId><version>0.8.2</version><!-- keep storm out of the jar-with-dependencies --><scope>provided</scope><exclusions><exclusion><groupId>org.slf4j</groupId><artifactId>slf4j-log4j12</artifactId></exclusion></exclusions></dependency>

另外在Maven中添加依赖包时，不知道怎么写 dependency的groupid和artifactid时，可在 http://mavenrepository.com 中收索依赖包的dependency的写法。