Question

I try to build jar from clean project with sbt-assembly how describes in docs:

addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.11.2") 

import AssemblyKeys._

assemblySettings

mainClass in assembly := Some("play.core.server.ProdServerStart")

fullClasspath in assembly += Attributed.blank(PlayKeys.playPackageAssets.value)

but it gives me a lot of deduplicate errors. How to build "fat" jar from play with sbt-assembly?

Answer 1

需要设置几个位来将播放应用程序构建为胖罐。

从asssembly插件开始。必须有一个名为assembly.sbt的文件直接位于项目目录中。如果您的项目名为MyPlayProject，则要准确并消除混淆，该文件必须位于“MyPlayProject / project / assembly.sbt”，并且应仅包含以下内容。

addSbtPlugin("com.eed3si9n" % "sbt-assembly" % "0.14.3"

显然版本可能会发生变化，但它应该有效。这会将程序集插件添加到项目中，如果像其他插件一样添加到plugins.sbt文件中，则无效。

作为涵盖所有基础的问题，还要确保涵盖标准的sbt项目，包括project / build.properties。请注意，对于Play 2.5.x，每https://www.playframework.com/documentation/2.5.x/Migration25#sbt-upgrade-to-0.13.11

需要13.8或更高版本

sbt.version=0.13.11

导致问题的可能关键部分是 build.sbt 的一部分应该包含合并策略的文件。 jar文件中有许多标准文件（例如MANIFEST.MF等），当你将所有的jar组合成一个胖jar时，你必须做一些事情来处理这些重复的文件。基本示例

assemblyMergeStrategy in assembly := {
  case r if r.startsWith("reference.conf") => MergeStrategy.concat
  case PathList("META-INF", m) if m.equalsIgnoreCase("MANIFEST.MF") => MergeStrategy.discard
  case x => MergeStrategy.first
}

您的里程可能与特定情况有关，但这对于标准的游戏胖罐来说非常基本。

上述合并策略的一些基本细节如下：

将所有jar的reference.conf合并到fat jar的单个文件中。我忘记了导致这一点的具体问题，但我不认为你可以在没有这一步的情况下将你的游戏应用程序作为胖罐运行。我没有证明这一点）
丢弃每个jar的MANIFEST.MF文件。许多在线示例将其显示为“case PathList（”META-INF“，xs @ _ *）=＆gt; MergeStrategy.discard”。这可以通过删除jar的META-INF目录中的任何内容来实现。然而，开始播放Play 2.4依赖注入已经非常难以玩，如果使用依赖注入，则net.sf.ehcache上存在库依赖，其中包括使用依赖注入所需的服务文件。修复是留下所有其他文件，只是像我一样丢弃MANIFEST.MF文件或只是删除所有内容而不使用任何依赖注入（不推荐）
一般情况下捕获所有重复文件中的第一个并丢弃其他文件的情况。当您在同一个库上有多个公共依赖项并且没有理由保留多个副本时很有用。

由于我无法在评论中澄清这是一个完整的示例build.sbt文件。

name := """MyPlayProject"""

version := "1.0"

lazy val `root` = (project in file(".")).enablePlugins(PlayScala)

scalaVersion := "2.11.8"

// Set JS Engine to use
JsEngineKeys.engineType := JsEngineKeys.EngineType.Node

// Set repository details for resolving additional depenecies
resolvers ++= Seq(
  "scalaz-bintray" at "https://dl.bintray.com/scalaz/releases",
  "ClouderaRepo" at "https://repository.cloudera.com/content/repositories/releases"
)

// Specifies dependencies to use in project
libraryDependencies ++= Seq(
  "org.apache.kafka" % "kafka_2.11" % "0.9.0.1",
  jdbc,
  cache,
  ws,
  specs2 % Test
)

// Add an additional source content route besides the default
unmanagedResourceDirectories in Test <+=  baseDirectory ( _ /"target/web/public/test" )

unmanagedSourceDirectories in Compile += baseDirectory.value / "src2" / "main" / "scala"

sourceDirectory in Compile <<= baseDirectory / "src2/main/scala"

scalaSource in Compile <<= baseDirectory / "src2/main/scala"

// Informs SBT Assembly how to handle duplicated files when combining project and dependency jars into a single fat jar
assemblyMergeStrategy in assembly := {
  case n if n.startsWith("reference.conf") => MergeStrategy.concat
  case PathList("META-INF", xs @ _*) => MergeStrategy.discard
  case x => MergeStrategy.first
}

我会在回答之前留下评论以获取更多细节，所以我可以更准确地回答我的问题，但问题有点陈旧，并说我的代表不够高，反正...希望这有帮助。

P.S。我在搜索有关我自己的合并问题的帮助时找到了您的问题，将游戏2.3.4迁移到2.5.4。这就是为什么我将META-INF合并策略更改为仅丢弃MANIFEST.MF，否则会导致以下异常。我正在用我的答案重新发布它，希望它可能会在搜索结果中被提取，因为我最初在搜索时发现它很少。

Oops, cannot start the server.
com.google.inject.CreationException: Unable to create injector, see the following errors:

1) Error in custom provider, net.sf.ehcache.CacheException: java.lang.AssertionError: No net.sf.ehcache.EhcacheInit services found
  while locating play.api.cache.CacheManagerProvider
  while locating net.sf.ehcache.CacheManager
    for field at play.api.cache.NamedEhCacheProvider.manager(Cache.scala:211)
  while locating play.api.cache.NamedEhCacheProvider
  at com.google.inject.util.Providers$GuicifiedProviderWithDependencies.initialize(Providers.java:149)
  at play.api.cache.EhCacheModule.play$api$cache$EhCacheModule$$bindCache$1(Cache.scala:184):
Binding(interface net.sf.ehcache.Ehcache qualified with QualifierInstance(@play.cache.NamedCache(value=play)) to ProviderTarget(play.api.cache.NamedEhCacheProvider@45312be2)) (via modules: com.google.inject.util.Modules$OverrideModule -> play.api.inject.guice.GuiceableModuleConversions$$anon$1)

1 error
    at com.google.inject.internal.Errors.throwCreationExceptionIfErrorsExist(Errors.java:466)
    at com.google.inject.internal.InternalInjectorCreator.injectDynamically(InternalInjectorCreator.java:176)
    at com.google.inject.internal.InternalInjectorCreator.build(InternalInjectorCreator.java:110)
    at com.google.inject.Guice.createInjector(Guice.java:96)
    at com.google.inject.Guice.createInjector(Guice.java:84)
    at play.api.inject.guice.GuiceBuilder.injector(GuiceInjectorBuilder.scala:181)
    at play.api.inject.guice.GuiceApplicationBuilder.build(GuiceApplicationBuilder.scala:123)
    at play.api.inject.guice.GuiceApplicationLoader.load(GuiceApplicationLoader.scala:21)
    at play.core.server.ProdServerStart$.start(ProdServerStart.scala:47)
    at play.core.server.ProdServerStart$.main(ProdServerStart.scala:22)
    at play.core.server.ProdServerStart.main(ProdServerStart.scala)
Caused by: net.sf.ehcache.CacheException: java.lang.AssertionError: No net.sf.ehcache.EhcacheInit services found
    at net.sf.ehcache.LibraryInit.init(LibraryInit.java:55)
    at net.sf.ehcache.CacheManager.init(CacheManager.java:366)
    at net.sf.ehcache.CacheManager.<init>(CacheManager.java:259)
    at net.sf.ehcache.CacheManager.newInstance(CacheManager.java:1037)
    at net.sf.ehcache.CacheManager.newInstance(CacheManager.java:936)
    at net.sf.ehcache.CacheManager.create(CacheManager.java:904)
    at play.api.cache.CacheManagerProvider.get$lzycompute(Cache.scala:205)
    at play.api.cache.CacheManagerProvider.get(Cache.scala:202)
    at play.api.cache.CacheManagerProvider.get(Cache.scala:201)
    at com.google.inject.internal.ProviderInternalFactory.provision(ProviderInternalFactory.java:81)
    at com.google.inject.internal.BoundProviderFactory.provision(BoundProviderFactory.java:72)
    at com.google.inject.internal.ProviderInternalFactory.circularGet(ProviderInternalFactory.java:61)
    at com.google.inject.internal.BoundProviderFactory.get(BoundProviderFactory.java:62)
    at com.google.inject.internal.SingleFieldInjector.inject(SingleFieldInjector.java:54)
    at com.google.inject.internal.MembersInjectorImpl.injectMembers(MembersInjectorImpl.java:132)
    at com.google.inject.internal.MembersInjectorImpl$1.call(MembersInjectorImpl.java:93)
    at com.google.inject.internal.MembersInjectorImpl$1.call(MembersInjectorImpl.java:80)
    at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1103)
    at com.google.inject.internal.MembersInjectorImpl.injectAndNotify(MembersInjectorImpl.java:80)
    at com.google.inject.internal.MembersInjectorImpl.injectMembers(MembersInjectorImpl.java:62)
    at com.google.inject.internal.InjectorImpl.injectMembers(InjectorImpl.java:984)
    at com.google.inject.util.Providers$GuicifiedProviderWithDependencies.initialize(Providers.java:149)
    at com.google.inject.util.Providers$GuicifiedProviderWithDependencies$$FastClassByGuice$$2a7177aa.invoke(<generated>)
    at com.google.inject.internal.cglib.reflect.$FastMethod.invoke(FastMethod.java:53)
    at com.google.inject.internal.SingleMethodInjector$1.invoke(SingleMethodInjector.java:57)
    at com.google.inject.internal.SingleMethodInjector.inject(SingleMethodInjector.java:91)
    at com.google.inject.internal.MembersInjectorImpl.injectMembers(MembersInjectorImpl.java:132)
    at com.google.inject.internal.MembersInjectorImpl$1.call(MembersInjectorImpl.java:93)
    at com.google.inject.internal.MembersInjectorImpl$1.call(MembersInjectorImpl.java:80)
    at com.google.inject.internal.InjectorImpl.callInContext(InjectorImpl.java:1092)
    at com.google.inject.internal.MembersInjectorImpl.injectAndNotify(MembersInjectorImpl.java:80)
    at com.google.inject.internal.Initializer$InjectableReference.get(Initializer.java:174)
    at com.google.inject.internal.Initializer.injectAll(Initializer.java:108)
    at com.google.inject.internal.InternalInjectorCreator.injectDynamically(InternalInjectorCreator.java:174)
    ... 9 more
Caused by: java.lang.AssertionError: No net.sf.ehcache.EhcacheInit services found
    at net.sf.ehcache.LibraryInit.initService(LibraryInit.java:78)
    at net.sf.ehcache.LibraryInit.init(LibraryInit.java:50)
    ... 42 more

How to build jar from play framework 2.5.x

1 个答案: