Android项目中Bouncy Castle重复类错误排查及解决

在Android项目中持续遭遇Bouncy Castle重复类冲突错误，最初尝试在app/build.gradle中添加以下配置，但未能解决问题：

android {
    configurations {
        all*.exclude module: 'bcprov-jdk15on'
        all*.exclude module: 'bcutil-jdk15on'
    }
}

环境信息 #

• Gradle JDK：Jbr 17.0.9
• Gradle版本：

  gradle-7.5-bin
  

• Android插件版本：

  id 'com.android.application' version '7.4.2' apply false
  id 'com.android.library' version '7.4.2' apply false
  

• 引入的Bouncy Castle依赖：

  implementation 'org.bouncycastle:bcpkix-jdk15to18:1.77'
  implementation 'org.bouncycastle:bcprov-jdk15to18:1.77'
  

具体错误信息 #

编译时出现大量重复类错误，核心示例如下：

Duplicate class org.bouncycastle.x509.PKIXCRLUtil found in modules jetified-bcprov-jdk15to18-1.77 (org.bouncycastle:bcprov-jdk15to18:1.77) and jetified-bcprov-jdk18on-1.77 (org.bouncycastle:bcprov-jdk18on:1.77)
Duplicate class org.bouncycastle.x509.PKIXCertPathReviewer found in modules jetified-bcprov-jdk15to18-1.77 (org.bouncycastle:bcprov-jdk15to18:1.77) and jetified-bcprov-jdk18on-1.77 (org.bouncycastle:bcprov-jdk18on:1.77)
Duplicate class org.bouncycastle.x509.X509Attribute found in modules jetified-bcprov-jdk15to18-1.77 (org.bouncycastle:bcprov-jdk15to18:1.77) and jetified-bcprov-jdk18on-1.77 (org.bouncycastle:bcprov-jdk18on:1.77)
Duplicate class org.bouncycastle.x509.X509AttributeCertStoreSelector found in modules jetified-bcprov-jdk15to18-1.77 (org.bouncycastle:bcprov-jdk15to18:1.77) and jetified-bcprov-jdk18on-1.77 (org.bouncycastle:bcprov-jdk18on:1.77)
Duplicate class org.bouncycastle.x509.X509AttributeCertificate found in modules jetified-bcprov-jdk15to18-1.77 (org.bouncycastle:bcprov-jdk15to18:1.77) and jetified-bcprov-jdk18on-1.77 (org.bouncycastle:bcprov-jdk18on:1.77)
Duplicate class org.bouncycastle.x509.X509CRLStoreSelector found in modules jetified-bcprov-jdk15to18-1.77 (org.bouncycastle:bcprov-jdk15to18:1.77) and jetified-bcprov-jdk18on-1.77 (org.bouncycastle:bcprov-jdk18on:1.77)
Duplicate class org.bouncycastle.x509.X509CertPairStoreSelector found in modules jetified-bcprov-jdk15to18-1.77 (org.bouncycastle:bcprov-jdk15to18:1.77) and jetified-bcprov-jdk18on-1.77 (org.bouncycastle:bcprov-jdk18on:1.77)
Duplicate class org.bouncycastle.x509.X509CertStoreSelector found in modules jetified-bcprov-jdk15to18-1.77 (org.bouncycastle:bcprov-jdk15to18:1.77) and jetified-bcprov-jdk18on-1.77 (org.bouncycastle:bcprov-jdk18on:1.77)
Duplicate class org.bouncycastle.x509.X509CertificatePair found in modules jetified-bcprov-jdk15to18-1.77 (org.bouncycastle:bcprov-jdk15to18:1.77) and jetified-bcprov-jdk18on-1.77 (org.bouncycastle:bcprov-jdk18on:1.77)
Duplicate class org.bouncycastle.x509.X509CollectionStoreParameters found in modules jetified-bcprov-jdk15to18-1.77 (org.bouncycastle:bcprov-jdk15to18:1.77) and jetified-bcprov-jdk18on-1.77 (org.bouncycastle:bcprov-jdk18on:1.77)

最终解决方案 #

通过在app/build.gradle中添加以下配置，覆盖所有冲突的Bouncy Castle模块，成功解决重复类问题：

configurations {
    all*.exclude module: 'bcprov-jdk15to18'
    all*.exclude module: 'bcutil-jdk18on'
    all*.exclude module: 'bcprov-jdk15on'
    all*.exclude module: 'bcutil-jdk15on'
}

内容的提问来源于stack exchange，提问作者Nadin Martini