Lagom入门提供了运行时异常

Question

安装的Activator为：

brew install typesafe-activator

创建了一个新项目：

activator new my-first-system lagom-java

更改为目录并按activator run运行项目：

[info] Set current project to my-first-system (in build file:/Users/arungupta/workspaces/my-first-system/) [info] Updating {file:/Users/arungupta/workspaces/my-first-system/}my-first-system... [info] Resolving jline#jline;2.12.1 ... [info] Done updating. java.lang.RuntimeException: No main class detected. at scala.sys.package$.error(package.scala:27) [trace] Stack trace suppressed: run last my-first-system/compile:run for the full output. [error] (my-first-system/compile:run) No main class detected. [error] Total time: 0 s, completed Mar 23, 2016 12:08:22 PM

以下是JDK版本：

java version "1.8.0_60" Java(TM) SE Runtime Environment (build 1.8.0_60-b27) Java HotSpot(TM) 64-Bit Server VM (build 25.60-b23, mixed mode)

缺少什么？

Answer 1

在根项目上没有要运行的主类，这就是异常的原因。要使用runAll启动所有Lagom服务，请参阅the Lagom getting started documentation。

顺便说一下，当在根项目上执行任务时，我们a ticket使run成为runAll的别名。

Answer 2

只需按activator代替activator run，然后按照上面的建议和入门指南进行runAll。