引用 google-play-services.jar

最新推荐文章于 2016-11-25 10:35:27 发布
最新推荐文章于 2016-11-25 10:35:27 发布
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分类专栏： android 杂谈
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本文链接：https://blog.youkuaiyun.com/baodinglaolang/article/details/49911759
本文详细介绍了如何通过修改Eclipse的eclipse.ini文件中的-Xms和-Xmx参数来解决Eclipse编译时卡死的问题。通过调整初始堆内存和最大堆内存的大小，可以有效提升Eclipse的性能，防止卡死现象发生。

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@integer/google_play_services_version 需要项目依赖sdk下的google-play-services_lib


编译时eclipse卡死，修改eclipse\eclipse.ini

-Xms256m
-Xmx1024m

google play services jar包
07-21
使用ecliplse开发用的时候转过来的jar包 需要哪个用哪个
google-play-services.jar
03-19
google-play-services.jar google admob所需jar包，导入项目即可
google play services jar
06-05
个人感觉这个jar单独用没有什么特殊意义，需要与sdk中google-play-services_lib 工程同时使用才有意义
google-play-services.jar精简包（version：4452000）
01-03
googlemap android使用的精简jar
Android一点 精简google-play-services.jar
Flyjun
11-25 3505
如果在eclipse上使用google-play-services.jar，最新的有5m多，很多的类库我们使用不到，这样在工程上就容易报65k，具体log如下： [2016-11-21 17:43:13 - Dex Loader] Unable to execute dex: method ID not in [0, 0xffff]: 65536 [2016-11-21 17:43:13 - M
google-play-services_lib
10-12
"google-play-services_lib"是Google为Android开发者提供的一项重要服务，它是Google Play服务的一个库，用于集成各种Google服务到Android应用程序中。这个库包含了Google API的接口和实现，包括地图、定位、游戏...
com.google.android.gms:play-gms:play-services:15.0.1
12-02
解决： Could not find play-services-basement.aar (com.google.android.gms:play-services-basement:15.0.1). Searched in the following locations: ...
google-play-services
12-07
当你想要连接到一个GoogleplayService库中提供的API,(比如：google+,Games,或者drive),你需要创建一个GoogleApiClient的实例。Google API Client提供了一个公共的入口点给所有的谷歌服务以及在用户设备和每个谷歌服务之间管理网络连接。 Google Play services可让 Google Play 商店提供的 Android 应用程序与 Google+ 和 Google 帐户整合。部分应用程序可能需要使用最新版本的 Google Play 服务，才能正常运作。
google-services常用的jar包最新版11.8.0版本，包括支付，登录，推送，分析，及base包等。
03-07
google-services常用的jar包，包括支付，登录，推送，分析，及base包等。
google-play-service lib jar (eclipse)
04-27
google play service lib 最新jar，适合eclipse开发google 的jar
google_play_service.jar for eclipse 201611 android7
11-06
google play service package for eclipse
如何引用google-play-services_lib
自由程式--FC
08-29 366
http://blog.sina.com.cn/s/blog_7cdaf8b60101o5n1.html
Android Studio报错@integer/google_play_services_version').
li635223417的专栏
05-10 3864
@integer/google_play_services_version
android studio 编译出错报@integer/google_play_services_version
qq_23906265的专栏
09-09 9676
Google 发布的 Google Play Services，最新版本 Version 7.0，在这个版本中增加了一些新特性，可以参看 https://developer.android.com/google/play-services/index.html#newfeatures http://android-developers.blogspot.com/2015/03/google
精简google-play-services.jar的方法
weixin_34331102的博客
06-22 247
2019独角兽企业重金招聘Python工程师标准>>> ...
sbt:spark-app> assembly [warn] multiple main classes detected: run 'show discoveredMainClasses' to see the list [error] 37 error(s) were encountered during the merge: [error] stack trace is suppressed; run last assembly for the full output [error] (assembly) [error] Deduplicate found different file contents in the following: [error] Jar name = protobuf-java-3.19.6.jar, jar org = com.google.protobuf, entry target = google/protobuf/api.proto [error] Jar name = spark-core_2.12-3.5.0.jar, jar org = org.apache.spark, entry target = google/protobuf/api.proto [error] Deduplicate found different file contents in the following: [error] Jar name = protobuf-java-3.19.6.jar, jar org = com.google.protobuf, entry target = google/protobuf/field_mask.proto [error] Jar name = spark-core_2.12-3.5.0.jar, jar org = org.apache.spark, entry target = google/protobuf/field_mask.proto [error] Deduplicate found different file contents in the following: [error] Jar name = commons-logging-1.1.3.jar, jar org = commons-logging, entry target = org/apache/commons/logging/Log.class [error] Jar name = jcl-over-slf4j-2.0.7.jar, jar org = org.slf4j, entry target = org/apache/commons/logging/Log.class [error] Deduplicate found different file contents in the following: [error] Jar name = protobuf-java-3.19.6.jar, jar org = com.google.protobuf, entry target = google/protobuf/struct.proto [error] Jar name = spark-core_2.12-3.5.0.jar, jar org = org.apache.spark, entry target = google/protobuf/struct.proto [error] Deduplicate found different file contents in the following: [error] Jar name = commons-logging-1.1.3.jar, jar org = commons-logging, entry target = org/apache/commons/logging/impl/NoOpLog.class [error] Jar name = jcl-over-slf4j-2.0.7.jar, jar org = org.slf4j, entry target = org/apache/commons/logging/impl/NoOpLog.class [error] Deduplicate found different file contents in the following: [error] Jar name = arrow-format-11.0.0.jar, jar org = org.apache.arrow, entry target = arrow-git.properties [error] Jar name = arrow-memory-core-11.0.0.jar, jar org = org.apache.arrow, entry target = arrow-git.properties [error] Jar name = arrow-memory-netty-11.0.0.jar, jar org = org.apache.arrow, entry target = arrow-git.properties [error] Jar name = arrow-vector-11.0.0.jar, jar org = org.apache.arrow, entry target = arrow-git.properties [error] Deduplicate found different file contents in the following: [error] Jar name = javax.inject-1.jar, jar org = javax.inject, entry target = javax/inject/Singleton.class [error] Jar name = jakarta.inject-2.6.1.jar, jar org = org.glassfish.hk2.external, entry target = javax/inject/Singleton.class [error] Deduplicate found different file contents in the following: [error] Jar name = protobuf-java-3.19.6.jar, jar org = com.google.protobuf, entry target = google/protobuf/duration.proto [error] Jar name = spark-core_2.12-3.5.0.jar, jar org = org.apache.spark, entry target = google/protobuf/duration.proto [error] Deduplicate found different file contents in the following: [error] Jar name = javax.inject-1.jar, jar org = javax.inject, entry target = javax/inject/Named.class [error] Jar name = jakarta.inject-2.6.1.jar, jar org = org.glassfish.hk2.external, entry target = javax/inject/Named.class [error] Deduplicate found different file contents in the following: [error] Jar name = javax.inject-1.jar, jar org = javax.inject, entry target = javax/inject/Inject.class [error] Jar name = jakarta.inject-2.6.1.jar, jar org = org.glassfish.hk2.external, entry target = javax/inject/Inject.class [error] Deduplicate found different file contents in the following: [error] Jar name = commons-logging-1.1.3.jar, jar org = commons-logging, entry target = org/apache/commons/logging/LogFactory.class [error] Jar name = jcl-over-slf4j-2.0.7.jar, jar org = org.slf4j, entry target = org/apache/commons/logging/LogFactory.class [error] Deduplicate found different file contents in the following: [error] Jar name = commons-logging-1.1.3.jar, jar org = commons-logging, entry target = org/apache/commons/logging/LogConfigurationException.class [error] Jar name = jcl-over-slf4j-2.0.7.jar, jar org = org.slf4j, entry target = org/apache/commons/logging/LogConfigurationException.class [error] Deduplicate found different file contents in the following: [error] Jar name = jakarta.annotation-api-1.3.5.jar, jar org = jakarta.annotation, entry target = javax/annotation/security/DenyAll.class [error] Jar name = jsr250-api-1.0.jar, jar org = javax.annotation, entry target = javax/annotation/security/DenyAll.class [error] Deduplicate found different file contents in the following: [error] Jar name = protobuf-java-3.19.6.jar, jar org = com.google.protobuf, entry target = google/protobuf/timestamp.proto [error] Jar name = spark-core_2.12-3.5.0.jar, jar org = org.apache.spark, entry target = google/protobuf/timestamp.proto [error] Deduplicate found different file contents in the following: [error] Jar name = jakarta.annotation-api-1.3.5.jar, jar org = jakarta.annotation, entry target = javax/annotation/Generated.class [error] Jar name = jsr250-api-1.0.jar, jar org = javax.annotation, entry target = javax/annotation/Generated.class [error] Deduplicate found different file contents in the following: [error] Jar name = protobuf-java-3.19.6.jar, jar org = com.google.protobuf, entry target = google/protobuf/source_context.proto [error] Jar name = spark-core_2.12-3.5.0.jar, jar org = org.apache.spark, entry target = google/protobuf/source_context.proto [error] Deduplicate found different file contents in the following: [error] Jar name = protobuf-java-3.19.6.jar, jar org = com.google.protobuf, entry target = google/protobuf/empty.proto [error] Jar name = spark-core_2.12-3.5.0.jar, jar org = org.apache.spark, entry target = google/protobuf/empty.proto [error] Deduplicate found different file contents in the following: [error] Jar name = jakarta.annotation-api-1.3.5.jar, jar org = jakarta.annotation, entry target = javax/annotation/Resource.class [error] Jar name = jsr250-api-1.0.jar, jar org = javax.annotation, entry target = javax/annotation/Resource.class [error] Deduplicate found different file contents in the following: [error] Jar name = jakarta.annotation-api-1.3.5.jar, jar org = jakarta.annotation, entry target = javax/annotation/security/RolesAllowed.class [error] Jar name = jsr250-api-1.0.jar, jar org = javax.annotation, entry target = javax/annotation/security/RolesAllowed.class [error] Deduplicate found different file contents in the following: [error] Jar name = jakarta.annotation-api-1.3.5.jar, jar org = jakarta.annotation, entry target = javax/annotation/PreDestroy.class [error] Jar name = jsr250-api-1.0.jar, jar org = javax.annotation, entry target = javax/annotation/PreDestroy.class [error] Deduplicate found different file contents in the following: [error] Jar name = protobuf-java-3.19.6.jar, jar org = com.google.protobuf, entry target = google/protobuf/descriptor.proto [error] Jar name = spark-core_2.12-3.5.0.jar, jar org = org.apache.spark, entry target = google/protobuf/descriptor.proto [error] Deduplicate found different file contents in the following: [error] Jar name = commons-logging-1.1.3.jar, jar org = commons-logging, entry target = org/apache/commons/logging/impl/SimpleLog.class [error] Jar name = jcl-over-slf4j-2.0.7.jar, jar org = org.slf4j, entry target = org/apache/commons/logging/impl/SimpleLog.class [error] Deduplicate found different file contents in the following: [error] Jar name = jakarta.annotation-api-1.3.5.jar, jar org = jakarta.annotation, entry target = javax/annotation/security/DeclareRoles.class [error] Jar name = jsr250-api-1.0.jar, jar org = javax.annotation, entry target = javax/annotation/security/DeclareRoles.class [error] Deduplicate found different file contents in the following: [error] Jar name = protobuf-java-3.19.6.jar, jar org = com.google.protobuf, entry target = google/protobuf/wrappers.proto [error] Jar name = spark-core_2.12-3.5.0.jar, jar org = org.apache.spark, entry target = google/protobuf/wrappers.proto [error] Deduplicate found different file contents in the following: [error] Jar name = javax.inject-1.jar, jar org = javax.inject, entry target = javax/inject/Qualifier.class [error] Jar name = jakarta.inject-2.6.1.jar, jar org = org.glassfish.hk2.external, entry target = javax/inject/Qualifier.class [error] Deduplicate found different file contents in the following: [error] Jar name = jakarta.annotation-api-1.3.5.jar, jar org = jakarta.annotation, entry target = javax/annotation/security/PermitAll.class [error] Jar name = jsr250-api-1.0.jar, jar org = javax.annotation, entry target = javax/annotation/security/PermitAll.class [error] Deduplicate found different file contents in the following: [error] Jar name = protobuf-java-3.19.6.jar, jar org = com.google.protobuf, entry target = google/protobuf/any.proto [error] Jar name = spark-core_2.12-3.5.0.jar, jar org = org.apache.spark, entry target = google/protobuf/any.proto [error] Deduplicate found different file contents in the following: [error] Jar name = jakarta.annotation-api-1.3.5.jar, jar org = jakarta.annotation, entry target = javax/annotation/Resources.class [error] Jar name = jsr250-api-1.0.jar, jar org = javax.annotation, entry target = javax/annotation/Resources.class [error] Deduplicate found different file contents in the following: [error] Jar name = jakarta.annotation-api-1.3.5.jar, jar org = jakarta.annotation, entry target = javax/annotation/Resource$AuthenticationType.class [error] Jar name = jsr250-api-1.0.jar, jar org = javax.annotation, entry target = javax/annotation/Resource$AuthenticationType.class [error] Deduplicate found different file contents in the following: [error] Jar name = jackson-core-2.15.2.jar, jar org = com.fasterxml.jackson.core, entry target = META-INF/versions/9/module-info.class [error] Jar name = jackson-databind-2.15.2.jar, jar org = com.fasterxml.jackson.core, entry target = META-INF/versions/9/module-info.class [error] Jar name = jackson-datatype-jsr310-2.13.4.jar, jar org = com.fasterxml.jackson.datatype, entry target = META-INF/versions/9/module-info.class [error] Jar name = gson-2.10.1.jar, jar org = com.google.code.gson, entry target = META-INF/versions/9/module-info.class [error] Jar name = log4j-api-2.20.0.jar, jar org = org.apache.logging.log4j, entry target = META-INF/versions/9/module-info.class [error] Jar name = parquet-jackson-1.12.3.jar, jar org = org.apache.parquet, entry target = META-INF/versions/9/module-info.class [error] Jar name = jcl-over-slf4j-2.0.7.jar, jar org = org.slf4j, entry target = META-INF/versions/9/module-info.class [error] Jar name = slf4j-api-2.0.7.jar, jar org = org.slf4j, entry target = META-INF/versions/9/module-info.class [error] Jar name = xz-1.9.jar, jar org = org.tukaani, entry target = META-INF/versions/9/module-info.class [error] Deduplicate found different file contents in the following: [error] Jar name = protobuf-java-3.19.6.jar, jar org = com.google.protobuf, entry target = google/protobuf/type.proto [error] Jar name = spark-core_2.12-3.5.0.jar, jar org = org.apache.spark, entry target = google/protobuf/type.proto [error] Deduplicate found different file contents in the following: [error] Jar name = jakarta.annotation-api-1.3.5.jar, jar org = jakarta.annotation, entry target = javax/annotation/PostConstruct.class [error] Jar name = jsr250-api-1.0.jar, jar org = javax.annotation, entry target = javax/annotation/PostConstruct.class [error] Deduplicate found different file contents in the following: [error] Jar name = netty-all-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-buffer-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-codec-http2-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-codec-http-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-codec-socks-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-codec-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-common-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-handler-proxy-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-handler-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-resolver-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-transport-classes-epoll-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-transport-classes-kqueue-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-transport-native-epoll-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-transport-native-epoll-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-transport-native-epoll-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-transport-native-kqueue-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-transport-native-kqueue-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-transport-native-unix-common-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Jar name = netty-transport-4.1.96.Final.jar, jar org = io.netty, entry target = META-INF/io.netty.versions.properties [error] Deduplicate found different file contents in the following: [error] Jar name = javax.inject-1.jar, jar org = javax.inject, entry target = javax/inject/Scope.class [error] Jar name = jakarta.inject-2.6.1.jar, jar org = org.glassfish.hk2.external, entry target = javax/inject/Scope.class [error] Deduplicate found different file contents in the following: [error] Jar name = log4j-1.2-api-2.20.0.jar, jar org = org.apache.logging.log4j, entry target = META-INF/org/apache/logging/log4j/core/config/plugins/Log4j2Plugins.dat [error] Jar name = log4j-core-2.20.0.jar, jar org = org.apache.logging.log4j, entry target = META-INF/org/apache/logging/log4j/core/config/plugins/Log4j2Plugins.dat [error] Deduplicate found different file contents in the following: [error] Jar name = javax.inject-1.jar, jar org = javax.inject, entry target = javax/inject/Provider.class [error] Jar name = jakarta.inject-2.6.1.jar, jar org = org.glassfish.hk2.external, entry target = javax/inject/Provider.class [error] Deduplicate found different file contents in the following: [error] Jar name = jakarta.annotation-api-1.3.5.jar, jar org = jakarta.annotation, entry target = javax/annotation/security/RunAs.class [error] Jar name = jsr250-api-1.0.jar, jar org = javax.annotation, entry target = javax/annotation/security/RunAs.class [error] Total time: 5 s, completed 2025年7月12日 下午12:56:20 [error] server failed to start on local:sbt-server-8814d8f5c3747ce114fe. java.io.IOException: Could not create lock for \\.\pipe\sbt-server-8814d8f5c3747ce114fe_lock, error 5 sbt:spark-app>
最新发布
07-13
<think>我们正在解决两个问题：1) 多个主类导致的警告；2) 打包时重复类文件冲突。 首先，对于多个主类的问题，通常是因为项目中有多个定义了main方法的对象。sbt assembly需要明确指定主类。 其次，重复类文件问题是因为多个依赖jar包中包含相同路径的类文件，需要定义合并策略（merge strategy）来解决冲突。 解决方案： 1. **指定主类**： 在build.sbt中通过`mainClass`设置来指定一个主类，例如： ```scala assembly / mainClass := Some("com.example.Main") ``` 或者，如果项目有多个模块，可以按模块设置： ```scala mainClass in assembly := Some("com.example.Main") ``` 2. **自定义合并策略**： sbt assembly提供了多种合并策略，常见的策略有： - `MergeStrategy.first`：选择第一个出现的文件 - `MergeStrategy.last`：选择最后一个出现的文件 - `MergeStrategy.deduplicate`：默认策略，如果所有文件内容相同则保留一个，否则报错 - `MergeStrategy.concat`：将所有文件内容连接起来 - `MergeStrategy.filterDistinctLines`：合并并去重行 - `MergeStrategy.rename`：重命名冲突的文件 我们可以在build.sbt中自定义合并策略，例如： ```scala assembly / assemblyMergeStrategy := { case PathList("META-INF", xs @ _*) => MergeStrategy.discard case x => MergeStrategy.first } ``` 上述策略表示：所有META-INF目录下的文件都丢弃（因为通常这些文件是元数据，容易冲突）；其他文件则选择第一个出现的。 但是，对于某些特定的冲突文件，我们可能需要更具体的策略。例如，对于`reference.conf`文件（Typesafe配置库使用），我们通常需要合并所有内容： ```scala assembly / assemblyMergeStrategy := { case PathList("META-INF", xs @ _*) => MergeStrategy.discard case "reference.conf" => MergeStrategy.concat case x => MergeStrategy.first } ``` 3. **处理常见的冲突**： - **META-INF/MANIFEST.MF**：通常我们不需要，可以丢弃（使用`MergeStrategy.discard`）或使用`MergeStrategy.rename`。 - **META-INF/services/**：这些是Java服务加载器使用的文件，需要合并（使用`MergeStrategy.concat`或`MergeStrategy.filterDistinctLines`）。 - **META-INF/spring.schemas**和**META-INF/spring.handlers**：Spring相关的文件，需要合并（`MergeStrategy.concat`或`MergeStrategy.filterDistinctLines`）。 一个更完整的合并策略示例： ```scala assembly / assemblyMergeStrategy := { case PathList("META-INF", "services", xs @ _*) => MergeStrategy.filterDistinctLines case PathList("META-INF", xs @ _*) => MergeStrategy.discard case "reference.conf" => MergeStrategy.concat case "application.conf" => MergeStrategy.concat case PathList("org", "apache", "spark", "unused", "UnusedStubClass.class") => MergeStrategy.first case _ => MergeStrategy.first } ``` 4. **排除某些依赖**： 如果某些依赖导致了难以解决的冲突，可以考虑排除它们。例如： ```scala libraryDependencies += "org.apache.spark" %% "spark-core" % sparkVersion % "provided" ``` 或者排除特定依赖中的某些包： ```scala libraryDependencies += "some.group" % "artifact" % "version" excludeAll( ExclusionRule(organization = "org.conflict") ) ``` 5. **使用`assemblyShadeRules`进行重定向（高级）**： 对于某些顽固的冲突，可以使用shade规则重命名包。例如： ```scala assemblyShadeRules in assembly := Seq( ShadeRule.rename("com.google.common.**" -> "shaded_guava.@1").inAll ) ``` 这样会将所有`com.google.common`包下的类重定向到`shaded_guava`包下，避免与其他库中的Guava冲突。 6. **解决多个主类的问题**： 除了在build.sbt中指定主类外，还可以在运行sbt assembly时指定： ```bash sbt "set mainClass in assembly := Some(\"com.example.Main\")" assembly ``` 7. **注意**：在Spark项目中，通常需要将`spark-core`和`spark-sql`设置为`provided`，避免打包到uber jar中，因为Spark集群已经提供了这些依赖。 示例build.sbt（部分）： ```scala import sbtassembly.MergeStrategy name := "spark-app" version := "0.1" scalaVersion := "2.12.15" libraryDependencies += "org.apache.spark" %% "spark-core" % "3.3.0" % "provided" libraryDependencies += "org.apache.spark" %% "spark-sql" % "3.3.0" % "provided" // 指定主类 assembly / mainClass := Some("com.example.MainApp") // 自定义合并策略 assembly / assemblyMergeStrategy := { case PathList("META-INF", "services", xs @ _*) => MergeStrategy.filterDistinctLines case PathList("META-INF", xs @ _*) => MergeStrategy.discard case "reference.conf" => MergeStrategy.concat case "application.conf" => MergeStrategy.concat case PathList("org", "apache", "spark", "unused", "UnusedStubClass.class") => MergeStrategy.first case _ => MergeStrategy.first } ``` 8. **调试**： 如果仍然遇到冲突，可以运行以下命令查看详细冲突信息： ```bash sbt assembly ``` 当冲突发生时，sbt assembly会打印出冲突的文件和来源jar包。根据这些信息调整合并策略。 9. **清理缓存**： 有时候，sbt的缓存可能导致问题，可以尝试清理： ```bash sbt clean ``` 通过以上步骤，应该能够解决多个主类警告和重复类文件冲突的问题。 相关问题： 1. 如何为Spark应用配置sbt assembly的合并策略？ 2. 在sbt中如何排除特定的传递依赖？ 3. 如何解决Spark应用中的Guava版本冲突？ 4. sbt assembly打包时如何指定主类？</think>### 解决 sbt assembly 时的多主类警告和重复类文件冲突问题 您遇到的两个核心问题： 1. `multiple main classes detected` 警告 2. `deduplicate: different file contents` 的重复类冲突 以下是系统化解决方案： --- ### 一、解决多主类警告 在 `build.sbt` 中添加主类指定： ```scala // 明确指定主类 mainClass in assembly := Some("com.yourpackage.MainApp") // 或自动选择第一个找到的主类 assembly / mainClass := Some( (Compile / discoveredMainClasses).value.headOption.getOrElse( throw new Exception("No main class found") ) ) ``` **说明**： - 使用 `sbt "show Compile/discoveredMainClasses"` 查看所有主类列表 - 推荐显式指定主类避免歧义[^1] --- ### 二、处理重复类冲突（核心方案） 在 `build.sbt` 中自定义合并策略： ```scala import sbtassembly.MergeStrategy assembly / assemblyMergeStrategy := { // 1. 优先处理常见冲突文件 case "module-info.class" => MergeStrategy.discard // Java 9+模块声明 case "META-INF/io.netty.versions.properties" => MergeStrategy.first case "META-INF/native-image/io.netty/**" => MergeStrategy.first // 2. 配置文件合并 case "reference.conf" => MergeStrategy.concat // Typesafe配置 case "application.conf" => MergeStrategy.concat // 3. 服务加载器文件合并 case PathList("META-INF", "services", xs @ _*) => MergeStrategy.filterDistinctLines // JDK ServiceLoader // 4. Spring特殊文件 case PathList("META-INF", "spring.handlers") => MergeStrategy.concat case PathList("META-INF", "spring.schemas") => MergeStrategy.concat // 5. 其他元数据丢弃 case PathList("META-INF", xs @ _*) => MergeStrategy.discard // 6. 默认策略：优先选择第一个出现的版本 case _ => MergeStrategy.first } ``` --- ### 三、Spark 专项优化 针对 Spark 依赖的特殊处理： ```scala libraryDependencies ++= Seq( "org.apache.spark" %% "spark-core" % sparkVersion % "provided", "org.apache.spark" %% "spark-sql" % sparkVersion % "provided", // 显式排除冲突库 ("com.typesafe.play" %% "play-json" % playJsonVersion) .exclude("com.google.guava", "guava") .exclude("org.slf4j", "slf4j-api") ) // Shading重定向解决顽固冲突 assemblyShadeRules := Seq( ShadeRule.rename("com.google.common.**" -> "shaded_guava.@1") .inLibrary("com.google.guava" % "guava" % "30.1.1-jre") .inProject ) ``` --- ### 四、验证与调试 1. **检查依赖树**： ```bash sbt dependencyTree > deps.txt ``` 搜索 `(c)` 标记的冲突依赖 2. **分析冲突文件**： ```bash sbt assembly ``` 当冲突出现时，sbt 会显示冲突文件的来源 JAR 包 3. **增量策略调试**： ```scala // build.sbt case "specific/conflict/Class.class" => MergeStrategy.rename // 重命名特定冲突类 // 或 MergeStrategy.pickFirst 强制选择第一个 ``` --- ### 五、完整配置示例 ```scala // build.sbt import sbtassembly.AssemblyPlugin.autoImport._ ThisBuild / version := "1.0" ThisBuild / scalaVersion := "2.12.15" lazy val root = (project in file(".")) .settings( name := "spark-app", mainClass in assembly := Some("com.example.MainApp"), assembly / assemblyJarName := "spark-app-uber.jar", assembly / assemblyMergeStrategy := { case PathList("META-INF", "services", xs @ _*) => MergeStrategy.filterDistinctLines case PathList("META-INF", xs @ _*) => MergeStrategy.discard case "reference.conf" => MergeStrategy.concat case "module-info.class" => MergeStrategy.discard case _ => MergeStrategy.first }, libraryDependencies ++= Seq( "org.apache.spark" %% "spark-core" % "3.3.0" % "provided", "org.apache.spark" %% "spark-sql" % "3.3.0" % "provided", "com.typesafe.play" %% "play-json" % "2.9.4" ) ) ``` --- ### 常见冲突解决方案表 | 冲突文件类型 | 推荐策略 | 适用场景 | |-------------|---------|---------| | `reference.conf` | `concat` | Typesafe配置 | | `module-info.class` | `discard` | Java 9+模块 | | `META-INF/services/*` | `filterDistinctLines` | 服务加载器 | | `spring.handlers` | `concat` | Spring框架 | | 版本冲突类文件 | `first` 或 `rename` | Guava/Netty等 | | 签名文件 | `discard` | 安全证书 | > **最佳实践**：优先使用`MergeStrategy.discard`处理元数据文件，对配置文件使用`concat`，核心类冲突使用`first`[^2]
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