Android构建重复类错误求助（React-Native桥接Java库开发）

Hey there, let's work through those duplicate class errors you're hitting—they're a super common headache when mixing Android dependencies in React Native projects, so you're not alone here.

First, Let's Break Down the Problem #

The errors happen because multiple dependencies are including the same Java classes:

• org.apache.commons.lang3.builder.CompareToBuilder comes from both commons-lang3-3.9.jar (likely pulled in by React Native/Unimodules) and creditCardNfcReader-1.0.3-runtime.jar (the NFC library you added)
• bolts.BoltsExecutors$ImmediateExecutor conflicts between bolts-tasks-1.4.0.jar (React Native's dependency) and jetified-bolts-android-1.1.2.jar (probably from Unimodules or another dependency)

Your previous exclusion attempts missed the mark because you were targeting the wrong dependency sources. Let's fix that.

Step 1: Diagnose Exact Dependency Sources (Optional but Helpful) #

First, run this command in your Android project directory to generate a full dependency tree—it shows exactly which libraries are pulling in the conflicting classes:

./gradlew :your-module-name:dependencies

Replace your-module-name with your library module name (e.g., :library) or :app if you're working directly in the app module. This will help you confirm where duplicates are coming from.

Step 2: Fix the Commons-Lang3 Duplicate #

The NFC library creditCardNfcReader includes its own copy of commons-lang3, but React Native or Unimodules already provides this. We'll exclude the embedded version from the NFC library:

implementation ('com.github.pro100svitlo:creditCardNfcReader:1.0.3') {
    exclude group: 'org.apache.commons', module: 'commons-lang3'
}

Step 3: Fix the Bolts Duplicate #

For the bolts conflict, you have two reliable options:

Option A: Force a Unified Bolts Version

Tell Gradle to use a single version of all bolts dependencies (we'll use the newer 1.4.0 version that React Native uses):

// Add this block outside the dependencies closure in your build.gradle
configurations.all {
    resolutionStrategy {
        force 'com.parse.bolts:bolts-tasks:1.4.0'
        force 'com.parse.bolts:bolts-android:1.4.0'
    }
}

Option B: Exclude the Conflicting Bolts Dependency

If you prefer to exclude the older bolts-android entirely, add this configuration (this works if the older version isn't actually needed by your project):

// Add this block outside the dependencies closure
configurations {
    all {
        exclude group: 'com.parse.bolts', module: 'bolts-android'
    }
}

Step 4: Clean Up Your Previous Attempts #

Delete this problematic block from your build.gradle—it's way too broad and will break your project by excluding all runtime dependencies:

configurations {
    runtime.exclude group: '*'
}

Step 5: Verify the Fix #

Run these commands to clean and rebuild your project:

./gradlew clean
./gradlew build

Bonus Tip: Lock React Native Version #

Using com.facebook.react:react-native:+ lets Gradle pull the latest version automatically, which can introduce unexpected dependency changes. It's better to lock it to a specific stable version, like:

implementation "com.facebook.react:react-native:0.72.6"

内容的提问来源于stack exchange，提问作者James