Interview Questions and Answers for 'Maven' | Search Interview Question

Interview Questions and Answers for 'Maven' - 52 question(s) found - Order By Rating

Q1. What are the disadvantages of Maven ?

Ans. Maven requires installation in the working system and the Maven plug-in for the IDE.
If the Maven code for an existing dependency is unavailable, you cannot add that dependency using Maven itself.
Some sources claim that Maven is slow.

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Q2. Which maven commands you usually work with ?

Maven

^{This question was recently asked at 'Akvelon'.This question is still unanswered. Can you please provide an answer.}

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Q3. How can we request maven to set up class path within the IDE

Maven

Ans. We can do mvn eclipse:eclipse or mvn idea:idea depending on the type of IDE

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Q4. What is the purpose of doing mvn eclipse:eclipse or man idea:idea

Maven

Ans. It is an instruction to maven to set up files ( class path , project ) within the IDE

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Q5. Have you ever had problems with SCM checkouts or tagging while doing release build in Maven ?

Maven

Ans. Yes Sometimes due to caching , conflicting tags , or incorrect scm info within pom.

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Q6. What is the difference between Maven and Jenkins ?

Tools

Ans. Maven is a build tool whereas Jenkins is continuous integration system.

Maven deals with application compilation, build and packaging whereas Jenkins tracks SCM for triggering builds and packages, triggering parent project builds upon dependencies, initiating builds and performing alerts. So Jenkins is kind of a wrapper around SCM and Build Tool for continuous integration and deployment.

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Q7. What version of Maven are you working with ? Are you aware of changes in the most recent version of Maven ?

Maven

Ans. 3.3.9

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Q8. What is the parent child relationship in Maven ?

Maven

Ans. Maven provides a facility to have a structure of inheritance relationship between modules / projects through parent tag in POM file. When we try building the parent project , all its child modules are built first in the order specified in the parent POM file.

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Q9. Write a Program to check if string is a Colidrome ?
(Colidrome is a word that has n alphabets followed by the reverse of the n alphabets, for ex - mallom)

Core Java

Ans.
public class Class {
   public static void main(String[] args) {
      String str = "mallam";
      String firstHalf = str.substring(0, str.length() / 2);
      String secondHalf = str.substring(str.length() / 2);

      if (firstHalf.equals(new StringBuilder(secondHalf).reverse().toString())) {
         System.out.println("It's a Colidrome");
      } else {
         System.out.println("It's not a Colidrome");
      }
   }
}

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Q10. Difference between Maven and Ant ?

Maven

Ans. Ant is procedural, we need to provide information about what to do and when to do through code.

Maven is declarative, everything is defined in the pom file.

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Q11. What is Maven ?

Maven

Ans. Maven is a build automation tool used primarily for Java projects.

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Q12. How to perform Maven Build and show Debug Information ?

Maven

Ans. Use -X option

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Q13. How to specify the sequence in which sub modules needs to be built ?

Maven

Ans. By specifying the modules in the same sequence in the parent pom.

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Q14. Write a Program to check if 2 strings are Anagrams ?

Core Java

Ans. public void checkIfAnagram(String str1,String str2){
boolean anagram = true;
for(char c:str1.toCharArray()){
if(!str2.contains(String.valueOf(c))){
System.out.println("Strings are Anagrams");
anagram = false;
}

if(anagram == true){
System.out.println("Strings are not Anagrams");
}
}
}

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Q15. Difference between Maven Project and Module ?

Maven

Ans. Maven Module has a Parent whereas Project doesnt. when we add the parent section to the pom file, it adds the module section to the parent project pom file. When we execute mvn compile / install, it basically checks that module section of the parent to identify all the modules that needs to be compiled first.

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Q16. What is the POM packaging in Maven ?

Maven

Ans. pom packaging is simply a specification that states the primary artifact is not a war or jar, but the pom.xml itself.

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Q17. If Project A is calling web service of project B and there are some changes in project B, Will Project A needs to be rebuilt ?

Maven

Ans. That depends if the interface for the resource in Project B gets changed. If only the internal implementation is changed, No change is required in Project A. Project A is not even required to be rebuilt.

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Q18. What is a Test Dependency Scope in Maven ?

Maven

Ans. 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.

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Q19. How do you resolve Maven Dependencies issue while upgrading dependencies versions ?

Maven

Ans. Step 1 - Upgrade the required dependency , perform build and check build errors

Step 2.1 - If the error is of missing transitive dependency ( which is rare and means that the previous version has a dependency which is missing in the later version ), I would look for the dependency in google and hence will include it as direct dependency in Pom file.

Step 2.2. If the error is for Duplicate dependencies , and the choice is between transitive and direct dependency, I usually remove the direct dependency.

Step 2.3 - If the error is for Duplicate dependencies , and both are transitive dependencies. I first make a choice ( usually later version ) and then ignore the previous version dependency.

Step 2.4 - If the error is for Duplicate dependencies , and there are more than 2 duplicates, I usually ignore it by specifying within maven-enforcer-plugin config.

Step 3 - Perform a Clean Build.

Step 4 - Check Maven Dependency Tree to make sure that Duplicates have been removed or dependency is there in case of missing dependency.

Step 5 - Perform tests and make sure that there are no runtime problems.

Step 6 - If there are runtime problems ( which very likely occurs if you have different version dependencies , very likely by doing 2.4 , you will have to remove step 2.4 and alternately perform 2.2 or 2.3 )

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Q20. What are the build lifecycles of Maven ?

Maven

Ans. Default , Clean and Site.

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Q21. What are different dependency scopes in Maven ?

Maven

Ans. Compile

This is the default scope. Compile dependencies are available in all classpaths of a project. Moreover, these 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.

Runtime

This scope indicates that the dependency is not required for compilation, but is for execution.

Test

This scope indicates that the dependency is 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.

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Q22. How to tackle duplicate classes in maven build ?

Maven

Ans. The simplest way is to ignore them if Maven enforcer plugin is complaining about it but it may lead to runtime problems later.

We can do the dependency:tree to see from where these duplicate ones are coming and hence can exclude the duplicate one.

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Q23. Have you heard of Ban Duplicate Classes Maven enforcer plugin ? What is its use ?

Maven

Ans. Yes , we have been using this plugin with our projects and its purpose is to warn and stop the Build if there are duplicates of the same package and class are being carried either directly or through transitive dependencies. the duplicate could be coming through different types of dependencies or through different versions of the same dependency. Its purpose is to make sure that there is only one copy thats being used at compile time and runtime and hence shouldnt later result in runtime problems.

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Very frequently asked. Among first few questions in almost all interviews. Among Top 5 frequently asked questions. Frequently asked in Indian service companies (HCL,TCS,Infosys,Capgemini etc based on multiple feedback ) and Epam Systems

Q24. Difference between == and .equals() ?

Core Java

Ans. "equals" is the method of object class which is supposed to be overridden to check object equality, whereas "==" operator evaluate to see if the object handlers on the left and right are pointing to the same object in memory.

x.equals(y) means the references x and y are holding objects that are equal. x==y means that the references x and y have same object.

Sample code:

String x = new String("str");
String y = new String("str");

System.out.println(x == y); // prints false
System.out.println(x.equals(y)); // prints true

Sample Code for equals

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Q25. What is the best practice configuration usage for files - pom.xml or settings.xml ?

Maven

Ans. The best practice guideline between settings.xml and pom.xml is that configurations in settings.xml must be specific to the current user and that pom.xml configurations are specific to the project.

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Q26. How can I change the default location of the generated jar when I command "mvn package"?

Maven

Ans. By default, the location of the generated jar is in ${project.build.directory} or in your target directory. We can change this by configuring the outputDirectory of maven-jar-plugin.

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Q27. What is Maven's order of inheritance?

Maven

Ans. 1. parent pom
2. project pom
3. settings
4. CLI parameters

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Q28. What is a Mojo?

Maven

Ans. A mojo is a Maven plain Old Java Object. Each mojo is an executable goal in Maven, and a plugin is a distribution of one or more related mojos.

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Q29. How do I determine which POM contains missing transitive dependency?

Maven

Ans. run mvn -X

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Q30. Where do we configure repositories in Maven ?

Maven

Ans. Within settings.xml in either MAVEN_HOME or .M2 directory.

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