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Interview Questions and Answers for 'Maven' - 55 question(s) found - Order By Newest

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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 )
  Q1. Difference between == and .equals() ?Core Java
Anonymous
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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   Like         Discuss         Correct / Improve     java   string comparison   string   object class   ==    equals   object equality  operator     Asked in 289 Companies      basic        frequent

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 Q2. What is a transitive dependency ? Can we override Transitive Dependency version and If Yes, how ?Maven
Admin
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Ans. Transitive dependency is the dependencies not defined directly in the current POM but the POM of the dependent projects.

Yes we can override transitive dependency version by specifying the dependency in the current POM.

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   Like         Discuss         Correct / Improve     maven   maven dependencies   maven transitive dependency   technical lead   build management


Usually asked to experienced developers.
 Q3. What is a cyclic dependency ?Maven
Admin
info@buggybread.com
Ans. A has dependency of B, B has dependency of C and C has dependency of A

With Maven 2 , came transitive dependency wherein in above scenario, C will acts as a dependency of A as if this dependency has been defined directly in A but the negative side is that if it leads to cyclic dependency , it creates problems.

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   Like         Discuss         Correct / Improve     maven   dependencies   cyclic dependencies   transitive dependencies   build management     Asked in 1 Companies        frequent


 Q4. Which of the following is dependency exclusion ?

a. A doesn't depend on C and then A marks C as excluded.
b. A Depends on B and B depends on C and then A can mark B as excluded.
c. A and B depends on C and then they can mark C as excluded.
d. A depends upon B and B depends upon C then A marks C as excluded.
Maven
Anonymous
Ans. A depends upon B and B depends upon C then A marks C as excluded.

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 Q5. How do you resolve Maven Dependencies issue while upgrading dependencies versions ?Maven2016-11-11 15:06:45

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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   Like         Discuss         Correct / Improve     maven  maven dependency  transitive dependency


 Q6. What is Maven's order of inheritance?Maven
Admin
info@buggybread.com
Ans. 1. parent pom
2. project pom
3. settings
4. CLI parameters

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   Like         Discuss         Correct / Improve     maven   build technologies   pom.xml   parent pom   project pom   build management

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 Q7. What is a Mojo?Maven
Admin
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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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 Q8. Where do we configure repositories in Maven ?Maven
admin
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Ans. Within settings.xml in either MAVEN_HOME or .M2 directory.

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   Like         Discuss         Correct / Improve     maven   maven repository


 Q9. What are different type of repositories in Maven ?Maven
admin
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Ans. Local and Remote.

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 Q10. How does Maven looks for a resource ? Maven
admin
info@buggybread.com
Ans. It refers to the settings.xml to look for the repositories to look for the resource. First It looks into the configured local repository, then it looks into the configured Remote repositories. If the resource is still not found , it looks it within maven repository central i.e repo1.maven.org. If its still not found, it throws the exception saying "Unable to find resource in repository central".

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 Q11. What is repository central ?Maven
admin
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Ans. Its the repository provided by Maven. In case your POM specify the dependencies and its not available in the configured local and the remote repository. It then looks for the resource in Maven Central. Maven provides most of the generic dependency resources at this remote location.

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   Like         Discuss         Correct / Improve     maven   maven repository


 Q12. What is Maven's order of inheritance?

a. parent pom -> project pom -> settings -> CLI parameters
b. project pom -> parent pom -> settings -> CLI parameters
c. settings -> parent pom -> project pom -> CLI parameters
d. CLI parameters -> settings -> parent pom -> project pom
Maven
Anonymous
Ans. parent pom -> project pom -> settings -> CLI parameters

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 Q13. What is the best practice configuration usage for files - pom.xml or settings.xml ?Maven
Admin
info@buggybread.com
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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   Like         Discuss         Correct / Improve     maven   build technologies   pom.xml   settings.xml   architecture   technical architect   technical lead   build management   build and release

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 Q14. How can I change the default location of the generated jar when I command "mvn package"?Maven
Admin
info@buggybread.com
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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   Like         Discuss         Correct / Improve     maven   build technologies   build management   build and release   release management


 Q15. How do I determine which POM contains missing transitive dependency?Maven
Admin
info@buggybread.com
Ans. run mvn -X

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   Like         Discuss         Correct / Improve     maven   build technologies   pom   build management


  Q16. Write a Program to check if 2 strings are Anagrams ?Core Java2016-11-30 20:52:37

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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   Like         Discuss         Correct / Improve      check if 2 strings are Anagrams     Asked in 30 Companies      basic        frequent


 Q17. What would you do if you have to add a jar to the project using Maven ?Maven
admin
info@buggybread.com
Ans. If its already there in Maven local repository, We can add that as a dependency in the project pom file with its Group Id, Artifact Id and version.

We can provide additional attribute SystemPath if its unable to locate the jar in the local repository.

If its not there in the local repository, we can install it first in the local repository and then can add it as dependency.

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   Like         Discuss         Correct / Improve     maven   maven dependencies   jar   architecture


 Q18. Have you ever had problem getting your projects in eclipse refreshed after you made changes in the Pom files ?Maven
admin
info@buggybread.com
Ans. Yes, It happens many times but I would usually perform mvn eclipse:eclipse and this would resolve the project refresh problems.

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   Like         Discuss         Correct / Improve     maven   maven repository   eclipse     Asked in 1 Companies


 Q19. What is the difference between compile and install ?Maven
admin
info@buggybread.com
Ans. Compile compiles the source code of the project

whereas

Install installs the package into the local repository, for use as a dependency in other projects locally

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   Like         Discuss         Correct / Improve     maven   install   build management


 Q20. How to perform a clean install without executing Tests ?Maven
Admin
info@buggybread.com
Ans. mvn clean install -Dmaven.test.skip=true

or

mvn install -DskipTests

or


org.apache.maven.plugins
maven-surefire-plugin

true



within parent POM file.

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   Like         Discuss         Correct / Improve     maven   maven install   unit testing   unit tests


 Q21. How can we see Dependencies for the project and where exactly they are defined ?Maven
Admin
info@buggybread.com
Ans. Using

mvn dependency:tree

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   Like         Discuss         Correct / Improve     maven   maven repository   maven dependencies   dependency tree


 Q22. What are the benefits of transitive depency in Maven ?Maven
Admin
info@buggybread.com
Ans. Transitive dependencies allows to avoid specifying the libraries that are required by the project which are specified in other dependent projects - Remote or Local.

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 Q23. What is the difference between Maven, Ant and Jenkins ?Tool
Admin
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Ans. Maven and Ant are Build Technologies whereas Jenkins is a continuous integration tool.

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 Q24. How do I determine which POM contains missing transitive dependency?

a. mvn -A
b. mvn -M
c. mvn -R
d. mvn -X
Maven
Anonymous
Ans. mvn -X

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 Q25. What is the sequence in which Maven looks for the resources ?

a. Remote-> Maven Central - > Local
b. Local -> Remote - Maven Central
c. Remote-> Local -> Maven Central
d. Maven Central -> Local -> Remote
Maven
Anonymous
Ans. Local -> Remote - Maven Central

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 Q26. POM stands for ...

a. Project Object Model
b. Project Oriented Model
c. Prospective Object Model
d. Prospective Objective Model
Maven
Anonymous
Ans. Project Object Model

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 Q27. Which of the following is not type of Maven Repository ?

a. Local
b. Remote
c. Maven Central
d. Maven Local
Maven
Anonymous
Ans. Maven Local

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 Q28. What is the default location of local repository ?

a. ~/.m2/repo
b. ~/m2./home/repository
c. ~/m2./repository
d. ~/m2./home/repo
Maven
Anonymous
Ans. ~/m2./repository

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   Like         Discuss         Correct / Improve     maven   repositories   local repositories   m2


 Q29. Which of the following is not type of Maven Plugin ?

a. Build
b. Reporting
c. Remote
d. All are valid Maven Plugin types
Maven
Anonymous
Ans. Remote

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 Q30. Which of the following is not a dependency scope in Maven ?

a. Compile
b. Test
c. System
d. Export
Maven
Anonymous
Ans. Export

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 Q31. What is a project's fully qualified artifact name?

a. ::
b. :
c. ::
d. :
Maven
Anonymous
Ans. ::

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 Q32. Have you heard of Ban Duplicate Classes Maven enforcer plugin ? What is its use ?Maven2016-09-12 10:23:45

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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 Q33. How to tackle duplicate classes in maven build ?Maven2016-09-12 10:26:42

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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   Like         Discuss         Correct / Improve     maven   ban duplicate classes enforcer plugin


 Q34. What are different dependency scopes in Maven ?Maven2016-09-14 14:12:00

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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 Q35. What are the build lifecycles of Maven ?Maven2016-09-14 14:25:48

Ans. Default , Clean and Site.

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 Q36. What is a Test Dependency Scope in Maven ?Maven2016-11-14 10:51:53

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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   Like         Discuss         Correct / Improve     maven     Asked in 2 Companies


 Q37. 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 ?Maven2016-11-14 11:28:04

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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 Q38. What is the POM packaging in Maven ?Maven2016-11-28 12:08:09

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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   Like         Discuss         Correct / Improve     pom  pom packaging  maven module


 Q39. Difference between Maven Project and Module ?Maven2016-11-28 12:18:34

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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   Like         Discuss         Correct / Improve     maven project vs module  maven project  maven module        frequent


 Q40. How to specify the sequence in which sub modules needs to be built ?Maven2016-12-01 13:19:35

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

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