How to add local .jar file dependency to build.gradle file?

user_1495015 0
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So I have tried to add my local .jar file dependency to my build.gradle file:

apply plugin: 'java'

sourceSets {
    main {
        java {
            srcDir 'src/model'
        }
    }
}

dependencies {
    runtime files('libs/mnist-tools.jar', 'libs/gson-2.2.4.jar')
    runtime fileTree(dir: 'libs', include: '*.jar')
}

And you can see that I added the .jar files into the referencedLibraries folder here: https://github.com/WalnutiQ/wAlnut/tree/version-2.3.1/referencedLibraries

But the problem is that when I run the command: gradle build on the command line I get the following error:

error: package com.google.gson does not exist
import com.google.gson.Gson;

Here is my entire repo: https://github.com/WalnutiQ/wAlnut/tree/version-2.3.1

gradle-eclipse dependency-management build.gradle gradle java
20 Answers

A solution for those using Kotlin DSL

The solutions added so far are great for the OP, but can't be used with Kotlin DSL without first translating them. Here's an example of how I added a local .JAR to my build using Kotlin DSL:

dependencies {
    compile(files("/path/to/file.jar"))
    testCompile(files("/path/to/file.jar"))
    testCompile("junit", "junit", "4.12")
}

Remember that if you're using Windows, your backslashes will have to be escaped:

...
compile(files("C:\\path\\to\\file.jar"))
...

And also remember that quotation marks have to be double quotes, not single quotes.

Edit for 2020:

Gradle updates have deprecated compile and testCompile in favor of implementation and testImplementation. So the above dependency block would look like this for current Gradle versions:

dependencies {
    implementation(files("/path/to/file.jar"))
    testImplementation(files("/path/to/file.jar"))
    testImplementation("junit", "junit", "4.12")
}
user_23865140

Shorter version:

dependencies {
    implementation fileTree('lib')
}
user_4112470

You can add jar doing:

For gradle just put following code in build.gradle:

dependencies {
...
compile fileTree(dir: 'lib', includes: ['suitetalk-*0.jar'])
...
}

and for maven just follow steps:

For Intellij: File->project structure->modules->dependency tab-> click on + sign-> jar and dependency->select jars you want to import-> ok-> apply(if visible)->ok

Remember that if you got any java.lang.NoClassDefFoundError: Could not initialize class exception at runtime this means that dependencies in jar not installed for that you have to add all dependecies in parent project.

user_60970740

Some more ways to add local library files using Kotlin DSL (build.gradle.kts):

implementation(
    files(
        "libs/library-1.jar",
        "libs/library-2.jar",
        "$rootDir/foo/my-other-library.jar"
    )
)

implementation(
    fileTree("libs/") {
        // You can add as many include or exclude calls as you want
        include("*.jar")
        include("another-library.aar") // Some Android libraries are in AAR format
        exclude("bad-library.jar")
    }
)

implementation(
    fileTree(
        "dir" to "libs/",
        // Here, instead of repeating include or exclude, assign a list of paths
        "include" to "*.jar",
        "exclude" to listOf("bad-library-1.jar", "bad-library-2.jar")
    )
)

The above code assumes that the library files are in libs/ directory of the module (by module I mean the directory where this build.gradle.kts is located).

You can use Ant patterns in includes and excludes as shown above.

See Gradle documentations for more information about file dependencies.

Thanks to this post for providing a helpful answer.

user_85836920

For Gradle version 7.4 with Groovy build file

repositories {
    flatDir {
        dirs 'libs'
    }
}

dependencies {
    implementation ':gson-2.2.4'
}
user_37498880

If you are on gradle 4.10 or newer:

implementation fileTree(dir: 'libs', includes: ['*.jar'])
user_79104540

Be careful if you are using continuous integration, you must add your libraries in the same path on your build server.

For this reason, I'd rather add jar to the local repository and, of course, do the same on the build server.

user_62421450
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