Friday, 16 September 2016

Maven All

Build tools

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What are the most common maven plugins used?
surefire - for unit testing
dependency - for module dependency analysis
cobertura - for unit test coverage analysis
liquibase - for running database migrations
assembly - for creating single executable jars containing all the required dependencies of an app

Which maven plugins have you used?
Name: maven-javadoc-plugin
               Version: 2.10.3

               Name: maven-compiler-plugin
               Version: 2.10.3

               Name: maven-assembly-plugin
               Version: 2.10.3


What is scope in dependency?

There are 6 scopes available:
  • compile
    This is the default scope, used if none is specified. Compile dependencies are available in all classpaths of a project. Furthermore, those dependencies are propagated to dependent projects.
  • provided
    This is much like compile, but indicates you expect the JDK or a container to provide the dependency at runtime. For example, when building a web application for the Java Enterprise Edition, you would set the dependency on the Servlet API and related Java EE APIs to scope provided because the web container provides those classes. This scope is only available on the compilation and test classpath, and is not transitive.
  • runtime
    This scope indicates that the dependency is not required for compilation, but is for execution. It is in the runtime and test classpaths, but not the compile classpath.
  • test
    This scope indicates that the dependency is not required for normal use of the application, and is only available for the test compilation and execution phases. This scope is not transitive.
  • system
    This scope is similar to provided except that you have to provide the JAR which contains it explicitly. The artifact is always available and is not looked up in a repository.
  • import (only available in Maven 2.0.9 or later)
    This scope is only supported on a dependency of type pom in the <dependencyManagement> section. It indicates the dependency to be replaced with the effective list of dependencies in the specified POM's <dependencyManagement> section. Since they are replaced, dependencies with a scope of import do not actually participate in limiting the transitivity of a dependency.

Maven vs Ant?

What are repositories in Maven?

What is mojo?
Maven plain old java object

How to output debug in Maven?
Run with -e or -X parameter.

How to run ant tasks in Maven?
-Using antrun plugin

How do I tell Maven to use the latest version of a dependency?
For maven 2, use latest or release, dropped in maven 3 for reproducable builds.

What exactly is a Maven Snapshot and why do we need it?
A snapshot version in Maven is one that has not been released.

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