有依赖冲突时，如何中断Maven构建?

问题描述：

我为一个项目运行了mvndependency:tree，我看到了如下输出:

I ran mvn dependency:tree for a project and I saw output like the following:

[INFO] my:project:jar:1.0.0-SNAPSHOT
[INFO] +- some.other:library:jar:2.0.0:compile
[INFO] |  \- org.slf4j:slf4j-api:jar:1.6.1:compile
[INFO] +- org.slf4j:slf4j-simple:jar:1.6.0:compile
[INFO] |  \- (org.slf4j:slf4j-api:jar:1.6.0:compile - omitted for conflict with 1.6.1)

这是一个糟糕的状态，因为我的项目直接依赖于slf4j 1.6.0，而我们依赖地依赖的某些库则依赖于slf4j 1.6.1.这两个版本恰好是二进制兼容的，因此该构建可以通过而不会发出任何警告. 是否有办法使Maven对它的依赖项解析更加严格，以便我可以配置在这种情况下会失败的新版本?在这种情况下，解决方案是将我们的依赖关系更新为新版本的slf4j.

This is a bad state to be in because my project depends directly on slf4j 1.6.0 and some library that we depend on transitively depends on slf4j 1.6.1. These two versions happen to be binary compatible so the build passes without any warnings. Is there a way to get Maven to be more strict about its dependency resolution so that I could configure a new build that would fail in this scenario? In this case, the solution would be to just update our dependency to the newer version of slf4j.

答

maven-enforcer-plugin具有 dependencyConvergence 配置可以满足我的需求.巧合的是，文档中的示例使用slf4j.

The maven-enforcer-plugin has a dependencyConvergence configuration which does what I want. Coincidentally, the example from the documentation uses slf4j.

像这样配置它:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-enforcer-plugin</artifactId>
    <version>1.0</version>
    <executions>
        <execution>
            <id>enforce</id>
            <configuration>
                <rules> 
                    <DependencyConvergence />
                </rules>
            </configuration>
            <goals> 
                <goal>enforce</goal>
            </goals>
        </execution>
    </executions>
</plugin>

这种依赖关系组合将导致构建失败:

This combination of dependencies will cause a build to fail:

  <dependencies>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-jdk14</artifactId>
      <version>1.6.1</version>
    </dependency>
    <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>slf4j-nop</artifactId>
      <version>1.6.0</version>
    </dependency>
  </dependencies>

在编译过程中将其记录下来:

With this being logged during compilation:

[ERROR]
Dependency convergence error for org.slf4j:slf4j-api:1.6.1 paths to dependency are:
+-org.myorg:my-project:1.0.0-SNAPSHOT
  +-org.slf4j:slf4j-jdk14:1.6.1
    +-org.slf4j:slf4j-api:1.6.1
and
+-org.myorg:my-project:1.0.0-SNAPSHOT
  +-org.slf4j:slf4j-nop:1.6.0
    +-org.slf4j:slf4j-api:1.6.0

有依赖冲突时，如何中断Maven构建?

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