Play2和Intellij没有检测到主类

Question

我正在尝试在sbt子项目中开发一个play框架应用程序。目录树如下所示：

- main-project
|--sub-project
| |--app
| |--conf
| |--logs
| |--public
| |--test
|--project
|--build.sbt

如果我尝试使用sbt shell使用以下命令运行播放应用程序

sub-project/run

播放正确开始。但是，如果我尝试使用IntelliJ运行配置运行它，我会收到错误java.lang.RuntimeException: No main class detected.

遵循IJ发布的第一行日志和命令：

/usr/java/jdk1.8.0_111/bin/java -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:41258,suspend=y,server=n -Dfile.encoding=UTF8 -Djline.terminal=none -Dsbt.log.noformat=true -Dsbt.global.base=/tmp/sbt-global-pluginstub -Xms512M -Xmx1024M -Xss1M -XX:+CMSClassUnloadingEnabled -XX:MaxPermSize=256M -javaagent:/home/myusername/Programmi/idea-IU-173.3727.127/lib/rt/debugger-agent.jar=/tmp/capture.props -classpath /home/myusername/.IntelliJIdea2017.3/config/plugins/Scala/launcher/sbt-launch.jar:/home/myusername/Programmi/idea-IU-173.3727.127/lib/idea_rt.jar xsbt.boot.Boot "project sub-project" run
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256M; support was removed in 8.0
Connected to the target VM, address: '127.0.0.1:41258', transport: 'socket'
[warn] No sbt.version set in project/build.properties, base directory: /home/luca/IdeaProjects/main-project/sub-project
[info] Set current project to sub-project (in build file:/home/myusername/IdeaProjects/main-project/sub-project/)
[info] Updating {file:/home/myusername/IdeaProjects/main-project/sub-project/}sub-project...
[info] Done updating.
[error] java.lang.RuntimeException: No main class detected.

看起来sbt命令与预期不同（qazxsw poi而不是qazxsw poi）

有没有人配置IntelliJ来使用启动工具调试播放应用程序？谢谢

Answer 1

在我的项目中运行通常就足够了 - 但我尝试过，比如：

sbt project sub-project run

它奏效了。我的控制台看起来像：

sbt sub-project/run

你在这里找到整个项目：

Answer 2

@Luca：这是因为scala插件sbt版本，激活器和intellij idea之间的插件版本冲突。新Intellij试图忽略$ PROJECT_DIR文件，其他flougins将conf文件放在那里。

解决方法：将其放在play2_project_settings.xml中：

/Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home/bin/java -agentlib:jdwp=transport=dt_socket,address=127.0.0.1:55426,suspend=y,server=n -Dconfig.file=server/conf/demo.conf -Xms512M -Xmx1024M -Xss1M -XX:+CMSClassUnloadingEnabled -javaagent:/Users/pascal.mengelt/Library/Caches/IntelliJIdea2017.3/captureAgent/debugger-agent.jar=/private/var/folders/cj/t4h2s_g56w1b78ck_mp1c1w40000gp/T/capture.props -Dfile.encoding=UTF-8 -classpath "/Users/pascal.mengelt/Library/Application Support/IntelliJIdea2017.3/Scala/launcher/sbt-launch.jar:/Applications/IntelliJ IDEA.app/Contents/lib/idea_rt.jar" xsbt.boot.Boot server/run
objc[15772]: Class JavaLaunchHelper is implemented in both /Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home/bin/java (0x10d7794c0) and /Library/Java/JavaVirtualMachines/jdk1.8.0_151.jdk/Contents/Home/jre/lib/libinstrument.dylib (0x10e8b44e0). One of the two will be used. Which one is undefined.
Connected to the target VM, address: '127.0.0.1:55426', transport: 'socket'
[info] Loading settings from idea.sbt ...
...

scala-adapters

在自定义项目路径中，将项目目录的绝对路径设置为魅力！

Answer 3

以上两种方式都有效。

有关@frostcs答案的更详细说明：

1. 打开

   <?xml version="1.0" encoding="UTF-8"?>
   <project version="4">
     <component name="Play2ExcludedModulesSettings">
       <option name="INFO">
         <map>
           <entry key="api">
             <value>
               <ProjectSettingsEntry>
                 <option name="confDir" value="$PROJECT_DIR$/api/app" />
                 <option name="templateImports">
                   <list>
                     <option value="_root_.play.twirl.api.TwirlFeatureImports._" />
                     <option value="_root_.play.twirl.api.TwirlHelperImports._" />
                     <option value="_root_.play.twirl.api.Html" />
                     <option value="_root_.play.twirl.api.JavaScript" />
                     <option value="_root_.play.twirl.api.Txt" />
                     <option value="_root_.play.twirl.api.Xml" />
                     <option value="models._" />
                     <option value="controllers._" />
                     <option value="play.api.i18n._" />
                     <option value="views.xml._" />
                     <option value="play.api.templates.PlayMagic._" />
                     <option value="play.api.mvc._" />
                     <option value="play.api.data._" />
                   </list>
                 </option>
                 <option name="routesImports">
                   <list>
                     <option value="controllers.Assets.Asset" />
                   </list>
                 </option>
                 <option name="uri" value="$PROJECT_DIR$/../../../../<custom-project-path>" />
               </ProjectSettingsEntry>
             </value>
           </entry>
           <entry key="chargeback-api">
             <value>
               <ProjectSettingsEntry>
                 <option name="playDistrPath" value="$USER_HOME$/.coursier/cache/v1/https/repo1.maven.org/maven2/com/typesafe/play/play_2.12/2.6.11/play_2.12-2.6.11.jar" />
               </ProjectSettingsEntry>
             </value>
           </entry>
         </map>
       </option>
     </component>
   </project>

2. 找到以下关键线：
3. 将play2_project_settings.xml前置为 <option name="uri" value="/E:/jc/code/lets-build-a-blockchain/stage1" /> 值。如下 $PROJECT_DIR$/../../../../
4. 它会像魅力一样工作！