Maven build lifecycle in Selenium Java - Cheat Sheet & Quick Revision

Recall & Review

beginner

What is the Maven build lifecycle?

The Maven build lifecycle is a sequence of phases that define the steps to build and manage a project, such as compiling code, running tests, and packaging the application.

beginner

Name the three main Maven build lifecycles.

The three main Maven build lifecycles are: default (handles project build and deployment), clean (cleans the project), and site (generates project documentation).

beginner

What does the 'compile' phase do in the Maven default lifecycle?

The 'compile' phase compiles the project's source code into bytecode, preparing it for testing or packaging.

beginner

Explain the purpose of the 'test' phase in Maven lifecycle.

The 'test' phase runs unit tests on the compiled code to verify that the code behaves as expected before packaging.

beginner

What happens during the 'package' phase in Maven?

During the 'package' phase, Maven bundles the compiled code and resources into a distributable format like a JAR or WAR file.

Which Maven lifecycle phase compiles the source code?

A test

B package

C compile

D install

The 'compile' phase is responsible for compiling the source code into bytecode.

What is the main purpose of the 'clean' lifecycle in Maven?

A Generate project documentation

B Compile source code

C Run unit tests

D Remove previous build files

The 'clean' lifecycle removes files generated by previous builds to ensure a fresh build.

Which phase packages the compiled code into a JAR or WAR file?

A package

B test

C deploy

D compile

The 'package' phase bundles the compiled code into distributable formats like JAR or WAR.

In which lifecycle phase are unit tests executed?

A compile

B test

C install

D clean

Unit tests run during the 'test' phase after compilation.

What does the 'install' phase do in the Maven default lifecycle?

A Copies the package to the local repository

B Compiles the source code

C Cleans the project

D Generates project site documentation

The 'install' phase copies the packaged artifact to the local Maven repository for use by other projects.

Describe the main phases of the Maven default build lifecycle and their purposes.

Think about the steps from writing code to sharing the built package.

Explain the difference between the 'clean' and 'default' Maven lifecycles.

One prepares the project by cleaning, the other builds and deploys.

Practice

1. Which Maven build lifecycle phase is responsible for compiling the source code of a Java project?

easy

A. clean

B. test

C. package

D. compile

Solution

1. Step 1: Understand Maven lifecycle phases

   Maven has phases like clean, compile, test, and package, each with a specific role.

2. Step 2: Identify the phase for compiling source code

   The compile phase compiles the Java source code into bytecode.

3. Final Answer:

   compile -> Option D

4. Quick Check:

   Compile phase compiles code = compile [OK]

Hint: Compile phase always compiles source code [OK]

Common Mistakes:

• Confusing 'test' phase with compiling code
• Thinking 'package' compiles code
• Assuming 'clean' compiles code

2. Which Maven command cleans the project by deleting the target directory?

easy

A. mvn clean

B. mvn compile

C. mvn package

D. mvn test

Solution

1. Step 1: Recall Maven commands and their purposes

   mvn clean deletes the target directory, removing previous build files.

2. Step 2: Match command to cleaning action

   Only mvn clean removes old build artifacts before a fresh build.

3. Final Answer:

   mvn clean -> Option A

4. Quick Check:

   Clean command deletes target folder = mvn clean [OK]

Hint: Clean command always removes old build files [OK]

Common Mistakes:

• Using mvn package to clean project
• Confusing mvn test with cleaning
• Thinking mvn compile cleans files

3. What will happen if you run mvn test on a Maven project that has not been compiled yet?

medium

A. Tests will fail because code is not compiled

B. Maven will compile the code first, then run tests

C. Maven will skip compilation and run tests directly

D. Maven will only clean the project without running tests

Solution

1. Step 1: Understand Maven lifecycle phase dependencies

   Running mvn test triggers all previous phases including compile automatically.

2. Step 2: Predict behavior when code is not compiled

   Maven compiles code before running tests to ensure tests run on compiled classes.

3. Final Answer:

   Maven will compile the code first, then run tests -> Option B

4. Quick Check:

   Test phase runs compile first = compile then test [OK]

Hint: Test phase always runs compile first [OK]

Common Mistakes:

• Assuming tests run without compiling
• Thinking Maven skips compile phase
• Confusing clean with test phase

4. You run mvn package but get an error saying tests failed. What is the best way to fix this without skipping tests?

medium

A. Run mvn package -DskipTests to skip tests

B. Run mvn compile only to compile code

C. Run mvn clean package to clean and rebuild

D. Delete the target folder manually and rerun mvn package

Solution

1. Step 1: Understand the error cause

   Tests failed during package phase, so build stopped.

2. Step 2: Choose a fix that cleans and rebuilds including tests

   Running mvn clean package removes old files and rebuilds fresh, running tests again.

3. Final Answer:

   Run mvn clean package to clean and rebuild -> Option C

4. Quick Check:

   Clean then package reruns tests = mvn clean package [OK]

Hint: Clean before package to fix test errors without skipping [OK]

Common Mistakes:

• Skipping tests instead of fixing them
• Only compiling without packaging
• Manually deleting target folder is error-prone

5. You want to create a Maven build that cleans, compiles, runs tests, and packages your project in one command. Which command should you use?

hard

A. mvn clean package

B. mvn clean compile test package

C. mvn compile test package

D. mvn test package

Solution

1. Step 1: Understand Maven lifecycle chaining

   Running a later phase runs all previous phases automatically.

2. Step 2: Identify the shortest command that runs all phases

   mvn clean package runs clean, compile, test, and package in order.

3. Final Answer:

   mvn clean package -> Option A

4. Quick Check:

   Package phase runs all before it = mvn clean package [OK]

Hint: Run clean then package to do all steps in one [OK]

Common Mistakes:

• Listing all phases explicitly is unnecessary
• Skipping clean phase
• Running test package without clean