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Interview Questions and Answers for 'Maven' - 52 question(s) found - Order By Rating | ||||
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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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This question was recently asked at 'Akvelon'.This question is still unanswered. Can you please provide an answer. | ||||
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Ans. We can do mvn eclipse:eclipse or mvn idea:idea depending on the type of IDE | ||||
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Like Discuss Correct / Improve  IDE  Maven | ||||
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Ans. It is an instruction to maven to set up files ( class path , project ) within the IDE | ||||
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Like Discuss Correct / Improve  IDE  eclipse  intelliJ  Maven | ||||
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Ans. Yes Sometimes due to caching , conflicting tags , or incorrect scm info within pom. | ||||
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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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Ans. 3.3.9 | ||||
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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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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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Like Discuss Correct / Improve  Colidrome  String  Code  Coding Asked in 1 Companies | ||||
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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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Ans. Maven is a build automation tool used primarily for Java projects. | ||||
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Like Discuss Correct / Improve  maven  build Asked in 6 Companies basic   frequent | ||||
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Ans. Use -X option | ||||
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Ans. By specifying the modules in the same sequence in the parent pom. | ||||
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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 | ||||
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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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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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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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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 | ||||
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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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Ans. Default , Clean and Site. | ||||
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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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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 | ||||
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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 | ||||
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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   == vs equals   equals vs == Asked in 294 Companies basic   frequent | ||||
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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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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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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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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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Ans. run mvn -X | ||||
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Ans. Within settings.xml in either MAVEN_HOME or .M2 directory. | ||||
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