如何在多模块Maven项目中编译其中的单个模块？

Question

This is how the project may looks like:

• moduleA

  -- pom.xml

• moduleB

  -- pom.xml

• pom.xml

moduleA has a dependency on moduleB. I have set <modules> in the parent pom.xml and other configurations in the child pom.xmls. And I can run mvn package in the parent dir, but every time I run mvn package in the directory of moduleA it fails.

I know that running mvn package -pl moduleA in the parent directory can fix the problem. Since Apache Flume allows me to compile any single module in its own directory, why can't my project?

Answer 1

Instead of launching goal "package", launch goal "install" on the root pom (or just moduleB). This will place moduleB in the local repository (~/.m2/repository) and Maven will be able to fetch it when it compiles only moduleA. Then you'll be able to compile only moduleA.

Answer 2

I had this issue: maven session does not declare a top level project

when I'm trying to run one module through command line like :- mvn clean install -pl moduleA where it was looking for parent module, So I've tried this & it worked with :- mvn clean install -pl .,moduleA in your case you can try this assuming dependency is already build & available in maven repo, else mvn clean install -pl .,moduleA --also-make should work. This will build only one specific project in multi-module maven project & as we've specified "." it would build parent pom which resolved the issue.