playframework - 包javax.persistence不存在 [英] playframework - package javax.persistence does not exist

问题描述

我有使用数据库的问题
我正在使用本教程
http：// vimeo .com / 58969923＃（一个来自playframework.com页面）模型中的
：

I have Issue with using database I was going with this tutorial http://vimeo.com/58969923# (one from playframework.com page) in the model:

play-2.2.1 / jcirs / app / models / MedicalIncident.java

play-2.2.1/jcirs/app/models/MedicalIncident.java

public class MedicalIncident extends Model {}

public class MedicalIncident extends Model{}

我正在尝试使用Entity。为此，我必须导入：
javax.persistence。*和play.db.ebean。*
但是找不到它们。
错误是

I am trying to use Entity. For that I have to import: javax.persistence.* and play.db.ebean.* but none of them can be found. The error is

包javax.persistence不存在

package javax.persistence does not exist

我该怎么办？
使用任何其他数据库引擎？或者应该下载一些依赖。
我想用playframework最好的方式。
请帮忙。

What should I do? Use any other database engine? Or should download some dependency. I would like to go with playframework best way. Please help.

我的配置
application.conf：

My configuration application.conf:

 db.default.driver=org.h2.Driver
 db.default.url="jdbc:h2:mem:play"
 ebean.default="models.*"

堆栈追踪：

[jcirs] $ run 8081

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

[info] play - Listening for HTTP on /0:0:0:0:0:0:0:0:8081

(Server started, use Ctrl+D to stop and go back to the console...)

[info] Compiling 5 Scala sources and 5 Java sources to /home/daniel/play-2.2.1/jcirs/target/scala-2.10/classes...
[error] /home/daniel/play-2.2.1/jcirs/app/models/MedicalIncident.java:4: error: package javax.persistence does not exist
[error] import javax.persistence.*;
[error] ^
[error] /home/daniel/play-2.2.1/jcirs/app/models/MedicalIncident.java:6: error: package play.db.ebean does not exist
[error] import play.db.ebean.*;
[error] ^
[error] /home/daniel/play-2.2.1/jcirs/app/models/MedicalIncident.java:14: error: cannot find symbol
[error] public class MedicalIncident extends Model {
[error]                                      ^
[error]   symbol: class Model
[error] /home/daniel/play-2.2.1/jcirs/app/models/MedicalIncident.java:13: error: cannot find symbol
[error] @Entity
[error]  ^
[error]   symbol: class Entity
[error] /home/daniel/play-2.2.1/jcirs/app/models/MedicalIncident.java:15: error: cannot find symbol
[error]     @id
[error]      ^
[error]   symbol:   class id
[error]   location: class MedicalIncident
[error] /home/daniel/play-2.2.1/jcirs/app/controllers/MedicalIncident.java:21: error: cannot find symbol
[error]         MedicalIncident medical_incident = Form.form(MedicalIncident.class).bindFormRequest().get();
[error]                                            ^
[error]   symbol:   variable Form
[error]   location: class MedicalIncident
[error] 6 errors
[error] (compile:compile) javac returned nonzero exit code
[error] application - 

! @6gfjpj0cf - Internal server error, for (GET) [/] ->

play.PlayExceptions$CompilationException: Compilation error[error: package javax.persistence does not exist]
        at play.PlayReloader$$anon$1$$anonfun$reload$2$$anonfun$apply$14$$anonfun$apply$16.apply(PlayReloader.scala:304) ~[na:na]
        at play.PlayReloader$$anon$1$$anonfun$reload$2$$anonfun$apply$14$$anonfun$apply$16.apply(PlayReloader.scala:304) ~[na:na]
        at scala.Option.map(Option.scala:145) ~[scala-library.jar:na]
        at play.PlayReloader$$anon$1$$anonfun$reload$2$$anonfun$apply$14.apply(PlayReloader.scala:304) ~[na:na]
        at play.PlayReloader$$anon$1$$anonfun$reload$2$$anonfun$apply$14.apply(PlayReloader.scala:298) ~[na:na]
        at scala.Option.map(Option.scala:145) ~[scala-library.jar:na]
[warn] play - No application found at invoker init

推荐答案

您是否在Build.scala中更新了项目依赖项？
不确定Play 2.2.1中是否有任何变化，但Build.scala中的Play 2.1.3依赖项看起来像这样：

Have you updated your project dependencies in Build.scala? Not sure if anything has changed in Play 2.2.1 but for Play 2.1.3 dependencies in Build.scala would look like this:

  val appDependencies = Seq(
    javaCore,
    javaJdbc,
    javaEbean
  )

编辑：
在Build.scala中更新依赖项后，不要忘记通过运行相应的播放命令来更新IDEA或Eclipse中的依赖项，例如：

Once you update your dependencies in Build.scala don't forget to update dependencies in your IDEA or Eclipse by running corresponding play command, e.g.

play idea

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