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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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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. 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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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. 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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Q44. 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)
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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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. 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. 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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