How to add local jar file dependency to build gradle file

Question

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

User · Answer

The best way to do it is to add this in your build gradle file and hit the sync option   dependency      compile files  path jar

User · Answer

I couldn t get the suggestion above at https   stackoverflow com a 20956456 1019307 to work   This worked for me though   For a file secondstring-20030401 jar that I stored in a libs  directory in the root of the project   repositories       mavenCentral          Not everything is available in a Maven Gradle repository   Use a local  libs   directory for these      flatDir          dirs  libs               compile name   secondstring-20030401

User · Answer

You could also do this which would include all JARs in the local repository   This way you wouldn t have to specify it every time   dependencies       compile fileTree dir   libs   include      jar

User · Answer

Goto File -  Project Structure -  Modules -  app -  Dependencies Tab -  Click on   button  -  Select File Dependency -   Select jar file in the lib folder  This steps will automatically add your dependency to gralde  Very Simple

User · Answer

Shorter version  dependencies       implementation fileTree  lib

User · Answer

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 · Answer

According to the documentation  use a relative path for a local jar dependency as follows   dependencies       implementation files  libs something local jar

User · Answer

The following works for me   compile fileTree dir   libs   include     jar     Refer to the Gradle Documentation

User · Answer

The accepted answer is good  however  I would have needed various library configurations within my multi-project Gradle build to use the same 3rd-party Java library    Adding   rootProject projectDir  to the  dir  path element within my  allprojects  closure meant each sub-project referenced the same  libs  directory  and not a version local to that sub-project     gradle build snippet allprojects                repositories             All sub-projects will now refer to the same  libs  directory         flatDir               dirs   rootProject projectDir libs                    mavenCentral                      EDIT by Quizzie  changed    rootProject projectDir   to   rootProject projectDir   works in the newest Gradle version

User · Answer

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 · Answer

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 · Answer

A simple way to do this is   compile fileTree include      jar    dir   libs     it will compile all the  jar files in your libs directory in App

User · Answer

An other way   Add library in the tree view  Right click on this one  Select menu  Add As Library   A dialog appear  let you select module  OK and it s done

User · Answer

The solution which worked for me is the usage of fileTree in build gradle file  Keep the  jar which need to add as dependency in libs folder  The give the below code in dependenices block in build gradle   dependencies       compile fileTree dir   libs   include      jar

User · Answer

You can try reusing your local Maven repository for Gradle    Install the jar into your local Maven repository   mvn install install-file -Dfile utility jar -DgroupId com company -DartifactId utility -Dversion 0 0 1 -Dpackaging jar Check that you have the jar installed into your    m2  local Maven repository   Enable your local Maven repository in your build gradle file   repositories     mavenCentral       mavenLocal        dependencies       implementation   com company utility 0 0 1          Now you should have the jar enabled for implementation in your project

User · Answer

The Question already has been answered in detail  I still want to add something that seems very surprising to me   The  gradle dependencies  task does not list any file dependencies  Even though you might think so  as they have been specified in the  dependencies  block after all    So don t rely on the output of this to check whether your referenced local lib files are working correctly

User · Answer

If you really need to take that  jar from a local directory    Add next to your module gradle  Not the app gradle file    repositories      flatDir          dirs  libs           dependencies      implementation name   gson-2 2 4      However  being a standard  jar in an actual maven repository  why don t you try this   repositories      mavenCentral     dependencies      implementation  com google code gson gson 2 2 4

[java] How to add local .jar file dependency to build.gradle file?

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