Tiven Wang
Wang Tiven April 27, 2017
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Basic Operations

Best Practices

Resolving conflicts using the dependency tree

A project’s dependency tree can be expanded to display dependency conflicts. For example, to find out why Commons Collections 2.0 is being used by the Maven Dependency Plugin, we can execute the following in the project’s directory:

mvn dependency:tree -Dverbose -Dincludes=commons-collections

The verbose flag instructs the dependency tree to display conflicting dependencies that were omitted from the resolved dependency tree. In this case, the goal outputs:

[INFO] [dependency:tree]
[INFO] org.apache.maven.plugins:maven-dependency-plugin:maven-plugin:2.0-alpha-5-SNAPSHOT
[INFO] +- org.apache.maven.reporting:maven-reporting-impl:jar:2.0.4:compile
[INFO] |  \- commons-validator:commons-validator:jar:1.2.0:compile
[INFO] |     \- commons-digester:commons-digester:jar:1.6:compile
[INFO] |        \- (commons-collections:commons-collections:jar:2.1:compile - omitted for conflict with 2.0)
[INFO] \- org.apache.maven.doxia:doxia-site-renderer:jar:1.0-alpha-8:compile
[INFO]    \- org.codehaus.plexus:plexus-velocity:jar:1.1.3:compile
[INFO]       \- commons-collections:commons-collections:jar:2.0:compile

Thus we can see that Commons Collections 2.0 was chosen over 2.1 since it is nearer, and by default Maven resolves version conflicts with a nearest-wins strategy.

More specifically, in verbose mode the dependency tree shows dependencies that were omitted for: being a duplicate of another; conflicting with another’s version and/or scope; and introducing a cycle into the dependency tree.

Run mvn spring-boot:run from parent module?

You can do it by adding following In parent pom:


And in your In my-app (Spring Boot module) pom:


Now you can do execute in project root:

mvn -pl my-app -am spring-boot:run

refer: https://stackoverflow.com/questions/41092200/run-mvn-spring-bootrun-from-parent-module

Install jar locally

mvn install:install-file -Dfile=<path-to-file> -DgroupId=<group-id> \
    -DartifactId=<artifact-id> -Dversion=<version> -Dpackaging=<packaging>


Install sources

安装源代码 jar 包,从项目源代码安装到库

mvn source:jar install -DskipTests

Download sources and javadoc

下载依赖包的 javadoc 和 sources

mvn dependency:resolve -Dclassifier=javadoc
mvn dependency:resolve -Dclassifier=sources

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