Android Docx4J Gradle: Duplicate class org.slf4j despite excluding it

Question

I am trying to use the Docx4j library in order to read in the contents of MS Word files selected by the user (I am trying to install it through this example: https://github.com/plutext/Docx4j4Android4). However, I receive the following error when I read in a MS Word file (I didn't include all the errors, but the duplicate classes all belong to org.slf4j.*):

Duplicate class org.slf4j.ILoggerFactory found in modules slf4j-android-1.6.1-RC1.jar (slf4j-android-1.6.1-RC1.jar) and slf4j-api-1.7.21.jar (org.slf4j:slf4j-api:1.7.21)
Duplicate class org.slf4j.IMarkerFactory found in modules slf4j-android-1.6.1-RC1.jar (slf4j-android-1.6.1-RC1.jar) and slf4j-api-1.7.21.jar (org.slf4j:slf4j-api:1.7.21)
Duplicate class org.slf4j.Logger found in modules slf4j-android-1.6.1-RC1.jar (slf4j-android-1.6.1-RC1.jar) and slf4j-api-1.7.21.jar (org.slf4j:slf4j-api:1.7.21)
........

This seems strange, since in my build.gradle, I explicity exclude org.sl4j when implementing the docx4j library.

Below is my build.gradle code:

apply plugin: 'com.android.application'

apply plugin: 'kotlin-android'

apply plugin: 'kotlin-android-extensions'

android {
    compileSdkVersion 29
    buildToolsVersion "29.0.2"
    defaultConfig {
        applicationId "com.example.diffchecker"
        minSdkVersion 21
        targetSdkVersion 29
        multiDexEnabled true
        versionCode 1
        versionName "1.0"
        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
    }
    compileOptions {
        sourceCompatibility JavaVersion.VERSION_1_8
        targetCompatibility JavaVersion.VERSION_1_8
    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
        }
    }
    dexOptions {
        // Comment the following in order to see actual errors, not unhelpful "too many errors"!
//        preDexLibraries = false
        additionalParameters=['--core-library']
    }
    packagingOptions {
        exclude 'META-INF/DEPENDENCIES'
        exclude 'META-INF/LICENSE'
        exclude 'META-INF/LICENSE.txt'
        exclude 'META-INF/license.txt'
        exclude 'META-INF/NOTICE'
        exclude 'META-INF/NOTICE.txt'
        exclude 'META-INF/notice.txt'
        exclude 'META-INF/ASL2.0'
        exclude("META-INF/*.kotlin_module")
    }
}

dependencies {
    implementation fileTree(include: ['*.jar'], dir: 'libs')
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.appcompat:appcompat:1.1.0'
    implementation 'androidx.core:core-ktx:1.1.0'
    implementation 'androidx.constraintlayout:constraintlayout:1.1.3'
    implementation 'io.github.java-diff-utils:java-diff-utils:4.5'
    // For developers using AndroidX in their applications
    implementation 'pub.devrel:easypermissions:3.0.0'
    // For developers using the Android Support Library
    implementation 'pub.devrel:easypermissions:2.0.1'
    implementation 'com.google.android.gms:play-services-ads:18.3.0'
    testImplementation 'junit:junit:4.12'
    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
    //implementation files('libs/commons-text-1.2.jar')
    implementation files('libs/commons-lang3-3.7.jar')
    //Thanks for using https://jar-download.com
    implementation 'org.webjars.bowergithub.telecomsante:pdf-viewer:2.2.0'
    implementation 'com.tom_roush:pdfbox-android:1.8.10.1'
    //implementation files('libs/commons-logging-1.2.jar')
    implementation 'com.bskim:maxheightscrollview:1.0.0@aar'
    implementation 'androidx.gridlayout:gridlayout:1.0.0'
    // Docx4j is the library used to read Word documents
    // https://mvnrepository.com/artifact/org.docx4j/docx4j
    implementation files('libs/commons-lang3-3.7.jar')
    implementation files('libs/commons-text-1.2.jar')

    //implementationtestCompile 'junit:junit:4.12'
    implementation 'javax.xml.bind:jaxb-api:2.2.12'
    implementation 'javax.xml.stream:stax-api:1.0-2'
    implementation 'com.fasterxml:aalto-xml:1.0.0'
    //compile 'org.codehaus.woodstox:stax2-api:4.0.0'
    implementation files('libs/awt-bastardised-17v8.jar')
    implementation files('libs/slf4j-android-1.6.1-RC1.jar')
    implementation files('libs/activation.jar')
    implementation files('libs/additionnal.jar')
    implementation files('libs/jaxb-core-2.3.0-SNAPSHOT-ANDROID.jar')
    implementation files('libs/jaxb-runtime-2.3.0-SNAPSHOT-ANDROID.jar')
    implementation files('libs/istack-commons-runtime-3.0.4-SNAPSHOT.jar')
    // with org.slf4j removed
    implementation('org.docx4j:docx4j:3.3.0') {
        ['org.apache.commons', 'commons-logging', 'org.sl4j'].each {
            exclude group: "$it"
        }
    }

}

And below is a screenshot of the library jar files I have:

score 3 · Answer 1 · answered Feb 17 '20 at 04:31

3

Add the following lines in app's build.gradle

configurations {
compile.exclude group: 'org.slf4j', module: 'slf4j-log4j12'
}

configurations.all {
    resolutionStrategy {
        force 'org.slf4j:slf4j-log4j12:1.7.25'
    }
}

answered Feb 17 '20 at 04:31

Saikrishna Rajaraman

3,205
2
16
29

score 1 · Answer 2 · answered Feb 21 '20 at 06:35

You can exclude org.slf4j:slf4j-api:1.7.21 and all other which are getting conflicts from org.docx4j:docx4j:3.3.0 like this

implementation('org.docx4j:docx4j:3.3.0') {
    exclude group: 'org.slf4j'
}

or also you can modify your dependency like this

implementation('org.docx4j:docx4j:3.3.0') {
    ['org.apache.commons', 'commons-logging', 'org.sl4j', 'org.slf4j'].each {
            exclude group: "$it"
    }
}

Martin Zeitler · Answer 3 · 2020-02-17T04:45:28.957

0

When looking at org.docx4j:docx4j:6.1.2, this raises the question, what you even need libs/slf4j-android-1.6.1-RC1.jar for? org.slf4j is already included and it works on Android without these Android bindings; pdfbox-android is about the same cheese .When reading over these demands - there barely is any real attempt noticeable; because there's no Java/Kotlin code at all.

edited Feb 17 '20 at 04:45

answered Feb 17 '20 at 04:24

Martin Zeitler

1
19
155
216

score 0 · Answer 4 · answered Aug 04 '22 at 19:33

0

What worked for me:

implementation("org.docx4j:docx4j:3.3.0") {
    exclude group: "org.slf4j"
}

configurations.all {
    resolutionStrategy {
        force "org.slf4j:slf4j-api:1.7.30"
    }
}

answered Aug 04 '22 at 19:33

videomugre

180
2
9

Android Docx4J Gradle: Duplicate class org.slf4j despite excluding it

4 Answers4