Java Reflection in multimodule maven project

Question

Project 1: pom.xml:

<dependency>
            <groupId>project2</groupId>
            <artifactId>project2</artifactId>
            <version>{someversion}</version>
        </dependency>

project 2: another maven spring project

project 1 and project 2 both are spring maven projects.From above architecture project 2 has been added as a library to project 1. My question is can I invoke project 1 class from project 2 using reflection?

Answer 1

In general yes, you can access of project2 from project1 at runtime. It will work both by "regular" class invocation and by reflection .

Otherwise why did you add the dependency? ;)

One caveat though: You state that both projects are "maven spring projects". You haven't explicitly stated the spring boot, but if project2 is a spring boot project and the jar is created with the help of spring-boot-maven-plugin , its impossible to make such a dependency because project2.jar is not really a jar (although it has the.jar extension).

Answer 2

Adding the Library Dependency

The Application project needs to have a dependency on the Library project. You need to modify your Application build file accordingly. More Details

For Maven, add the following dependency:

<dependency>
  <groupId>com.example</groupId>
  <artifactId>library</artifactId>
  <version>${project.version}</version>
</dependency>COPY

The following listing shows the finished pom.xml file:

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>2.4.2</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.example</groupId>
    <artifactId>multi-module-application</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>multi-module-application</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <java.version>1.8</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>com.example</groupId>
            <artifactId>library</artifactId>
            <version>${project.version}</version>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

Answer 3

We can invoke project 1 classes from project 2 classes using reflection.