How to pass the classpath from Maven or Gradle to the CLI

Generating the classpath from Maven

While there is more than one way to generate the project's full classpath (including dependencies) from Maven, one example is as follows:

When compiling the project, the output from Maven should have indicated where the project's class files were written to. This is typically at target/classes within the directory containing the project's pom.xml file.

Next, run the mvn dependency:build-classpath command from the directory containing the pom.xml file for the module you wish to build.

This will print out a classpath, prefixed by Dependencies classpath.

Append the target/classes folder (or equivalent) as the first entry to the dependencies classpath: /home/myUser/myProject/target/classes:... (where ... is the contents of the above dependencies classpath)

Generating the classpath from Gradle

While there is more than one way to generate a project's full classpath (including dependencies) from Gradle, one example is as follows:

Append the following task at the end of your project's build.gradle file:

task printClasspath {
    def cp = "${project.buildDir}/classes";
    configurations.testRuntime.each { cp += (':'+it.toString()) };
    println "Dependencies classpath: " + cp;  
}

Execute the task by running gradle printClasspath (or ./gradlew printClasspath / gradlew.bat printClasspath if your project uses a Gradle Wrapper).

This will print out a classpath, prefixed by Dependencies classpath, containing the location of the project's class files as the first entry (typically /home/myUser/myProject/build/classes)

Passing the classpath to the CLI

Once the full classpath has been generated, it can be passed to the CLI via the -cp argument: -cp "/home/myUser/myProject/target/classes:...".

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