If you just need a pre-built JAR file, you can always find compiled resources from the Maven release repository, including recent snapshot/nightly builds.

Download the latest release, or, retrieve the latest source code from Github.

The code is organized into several subdirectories, corresponding to modules, like core/ and javase/. Within each Java-based module, there is a pom.xml file for use with Apache Maven.

A few configuration steps are needed, depending on which modules you want to build. From the directory where you unpacked or checked out the source code:

The Android SDK must be installed of course. Run the tool called sdkmanager and ensure that platform support for the Android release targeted by the app is installed. At the time of this writing, that's platform level 22 / Android 5.1.

export ANDROID_HOME=/change/this/path/to/android-sdk

Note that release 3.4.0 and later requires Java 8, which requires targeting API level 24 or later. For a possible way to use it with earlier API levels, see https://github.com/zxing/zxing/wiki/Frequently-Asked-Questions#it-doesnt-work-with-java-7--no-interface-method-sortljavautilcomparator or simply use an earlier release.

From the root of the project, run mvn install to compile, test and assemble all modules. Add -DskipTests to skip unit tests. Note that Android-related modules and apps will not be built unless ANDROID_HOME is set.

Compiled .jar files are found in submodules after this. For example, the compiled core/ code is available at core/target/core-x.y.z.jar.

To build the Barcode Scanner Android app, a few slightly different steps are needed. From android/, run mvn package android:apk to produce a compile .apk file in target. Use android-x.y.z-aligned.apk.

Other users will not be able to build the signed release version, but the command is: mvn -Pandroid-release -Djarsigner.storepass=... -Djarsigner.keypass=... clean package android:apk.

Note that the deployable .war file will be produced in the target/ directory.

Most components are libraries and are not run directly.

1. Build android/
2. Connect your device via USB
3. If you already have the standard version of Barcode Scanner installed, uninstall it
4. Make sure your device is set to allow apps from untrusted sources
5. Run mvn android:deploy.

After building, in the javase/ directory, execute mvn -DskipTests package assembly:single to create a single JAR file containing all classes needed to run client command line apps, as target/javase-x.y.z-jar-with-dependencies.jar. Run CommandLineRunner with simply:

java -jar target/javase-x.y.z-jar-with-dependencies.jar [URL | FILE]

Path syntax is different on Windows. Here and elsewhere you will need to use ';' rather than ':' to separate classpath elements, and likely need to use the '' path separator.

core/, javase/, android-integration and zxingorg can be used directly in a Maven-based project without any download or installation. Instead, add as dependencies from groupID com.google.zxing artifactIDs core, javase, android-integration or zxingorg:

<dependencies>
  ...
  <dependency>
    <groupId>com.google.zxing</groupId>
    <artifactId>core</artifactId>
    <version>(the current version)</version>
  </dependency>
</dependencies>

1. For android-integration, android-core, zxing.appspot.com, (and zxingorg?) manually update parent and version to the upcoming release
2. Commit locally only
3. Update the current milestone in Github as needed and close it
4. unset ANDROID_HOME so as to not release Android apps
5. mvn -s -P \!appspot private-settings.xml clean release:clean release:prepare and optionally add -DreleaseVersion=x.y.z -DdevelopmentVersion=a.b.c-SNAPSHOT if the answer is not the one Maven guesses and you want to avoid repeating the answer
6. If all is well, mvn -P \!appspot -Darguments="-Dgpg.passphrase=..." -s private-settings.xml release:perform
7. Log in to oss.sonatype.org and finish the release (http://central.sonatype.org/pages/releasing-the-deployment.html).
8. Update the release on Github
9. Restore modules version and parent to latest SNAPSHOT, like they were manually modified above
10. To immediately publish a next snapshot, mvn -s private-settings.xml clean deploy
11. To get the site ready, first go back to the tag, git checkout -f tags/zxing-x.y.z
12. mvn clean site
13. mvn site:stage site:deploy -pl .
14. git add docs
15. You may wish to git status to ensure that all the changes are in docs/ and that they make sense
16. git checkout master
17. git commit -m 'Update site for x.y.z'
18. git push origin master

After building with mvn package, deploy from target/zxing.appspot.com-x.y.z with:

gcloud app deploy --project [PROJECT] --no-promote --version [VERSION]