playframework/play-java-seed.g8有很多警告

我使用以下方法创建了一个播放项目：

使用以下选项：

name [play-java-seed]: name
organization [com.example]:
scala_version [2.12.4]:
play_version [2.6.15]:
sbt_version [1.0.4]:

执行

sbt run

后，我收到了很多警告：

Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option MaxPermSize; support was removed in 8.0
Java HotSpot(TM) 64-Bit Server VM warning: Ignoring option MaxPermSize; support was removed in 8.0
[info] Loading settings from plugins.sbt,scaffold.sbt ...
[info] Loading project definition from E:\Play\name\project
[info] Updating {file:/E:/Play/name/project/}name-build...
[info] Done updating.
[warn] Found version conflict(s) in library dependencies; some are suspected to be binary incompatible:
[warn]  * org.webjars:webjars-locator-core:0.33 is selected over 0.32
[warn]      +- com.typesafe:npm_2.12:1.2.1                        (depends on 0.32)
[warn]      +- com.typesafe.sbt:sbt-web:1.4.3 (scalaVersion=2.12, sbtVersion=1.0) (depends on 0.32)
[warn]  * org.codehaus.plexus:plexus-utils:3.0.17 is selected over {2.1, 1.5.5}
[warn]      +- org.apache.maven:maven-settings:3.2.2              (depends on 3.0.17)
[warn]      +- org.apache.maven:maven-repository-metadata:3.2.2   (depends on 3.0.17)
[warn]      +- org.apache.maven:maven-aether-provider:3.2.2       (depends on 3.0.17)
[warn]      +- org.apache.maven:maven-model:3.2.2                 (depends on 3.0.17)
[warn]      +- org.apache.maven:maven-core:3.2.2                  (depends on 3.0.17)
[warn]      +- org.apache.maven:maven-artifact:3.2.2              (depends on 3.0.17)
[warn]      +- org.apache.maven:maven-settings-builder:3.2.2      (depends on 3.0.17)
[warn]      +- org.apache.maven:maven-model-builder:3.2.2         (depends on 3.0.17)
[warn]      +- org.sonatype.plexus:plexus-sec-dispatcher:1.3      (depends on 1.5.5)
[warn]      +- org.eclipse.sisu:org.eclipse.sisu.plexus:0.0.0.M5  (depends on 2.1)
[warn]  * com.google.guava:guava:23.0 is selected over {10.0.1, 16.0, 20.0}
[warn]      +- io.methvin:directory-watcher:0.3.2                 (depends on 23.0)
[warn]      +- com.fasterxml.jackson.datatype:jackson-datatype-guava:2.8.8 (depends on 10.0.1)
[warn]      +- org.eclipse.sisu:org.eclipse.sisu.plexus:0.0.0.M5  (depends on 10.0.1)
[warn]      +- com.spotify:docker-client:8.9.0                    (depends on 10.0.1)
[warn] Run 'evicted' to see detailed eviction warnings
[info] Loading settings from build.sbt ...
[info] Set current project to name (in build file:/E:/Play/name/)
[info] Updating {file:/E:/Play/name/}root...
[info] Done updating.
[warn] Found version conflict(s) in library dependencies; some are suspected to be binary incompatible:
[warn]  * com.google.guava:guava:22.0 is selected over {19.0, 20.0}
[warn]      +- com.typesafe.play:play_2.12:2.6.15 ()              (depends on 22.0)
[warn]      +- org.reflections:reflections:0.9.11                 (depends on 20.0)
[warn]      +- com.google.inject:guice:4.1.0                      (depends on 19.0)
[warn]  * com.typesafe.akka:akka-stream_2.12:2.5.11 is selected over 2.4.20
[warn]      +- com.typesafe.play:play-streams_2.12:2.6.15 ()      (depends on 2.5.11)
[warn]      +- com.typesafe.akka:akka-http-core_2.12:10.0.13 ()   (depends on 2.4.20)
[warn]  * com.typesafe.akka:akka-actor_2.12:2.5.11 is selected over 2.4.20
[warn]      +- com.typesafe.play:play_2.12:2.6.15 ()              (depends on 2.5.11)
[warn]      +- com.typesafe.akka:akka-stream_2.12:2.5.11 ()       (depends on 2.5.11)
[warn]      +- com.typesafe.akka:akka-slf4j_2.12:2.5.11 ()        (depends on 2.5.11)
[warn]      +- com.typesafe.akka:akka-parsing_2.12:10.0.13 ()     (depends on 2.4.20)
[warn] Run 'evicted' to see detailed eviction warnings

--- (Running the application, auto-reloading is enabled) ---

[info] p.c.s.AkkaHttpServer - Listening for HTTP on /0:0:0:0:0:0:0:0:9000

(Server started, use Enter to stop and go back to the console...)

我的机器上安装了Java9.0.4和SBT1.1.0

提前感谢您的回答。

这些驱逐警告是公开的。由于Play是一个成熟且广泛使用的框架，所以忽略这些警告是最安全的。有三种可能的选择：

保持警告可见，直到Play project修复它们

通过以下方式隐藏警告：

通过

我个人会建议第一种选择

这里有一点关于。考虑以下警告：

[warn]  * com.typesafe.akka:akka-stream_2.12:2.5.11 is selected over 2.4.20
[warn]      +- com.typesafe.play:play-streams_2.12:2.6.15 ()      (depends on 2.5.11)
[warn]      +- com.typesafe.akka:akka-http-core_2.12:10.0.13 ()   (depends on 2.4.20)

---

它指出

play streams

和

akka-http-core

都依赖于

akka-stream

，但是它们依赖于它的不同版本。默认情况下，SBT通过选择更高版本来解决冲突，即

2.5.11

。请注意，这使得

akka http core

依赖于

2.5.11

，即使它只根据

2.4.20

编译过，也就是说，它现在依赖于未来从未测试过的库。如果

2.5.11

与

2.4.20

不在一起，则这可能会在项目中引入错误。打个比方，假设你有一辆2001年制造的汽车，但你却盲目地从2002年开始安装引擎。这辆车现在会像2001年那样运转吗？如果数千名司机驾驶这辆车时没有任何问题，那么这辆车可能是安全的。

暂时忽略他们，在某些情况下，如果你发现一些冲突，他们会很有帮助。

[warn]  * com.typesafe.akka:akka-stream_2.12:2.5.11 is selected over 2.4.20
[warn]      +- com.typesafe.play:play-streams_2.12:2.6.15 ()      (depends on 2.5.11)
[warn]      +- com.typesafe.akka:akka-http-core_2.12:10.0.13 ()   (depends on 2.4.20)