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问在GlobalSetting.onStart()上执行PLayframework中的JPA查询
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Stack Overflow用户

提问于 2014-12-08 15:03:18

回答 1查看 1.8K关注 0票数 1

如何在开始时对播放框架全局类方法执行一些db操作。

我想从其他来源把一些数据放到数据库中。现在我有：

我的代码：

public class Global extends GlobalSettings {


    @Override
    @Transactional
    public void onStart(Application application) {
                    Akka.system().scheduler().schedule(
                            Duration.create(1, TimeUnit.SECONDS), // start task delay
                            Duration.create(24, TimeUnit.HOURS), // between task instance delay
                            //Duration.create(24, TimeUnit.HOURS), // between task instance delay
                            new Runnable() {
                                @Override
                                @Transactional
                                public void run() {
                                    System.out.println("Importing CRM data...");
                                    ImportCrmData.start();
                                    System.out.println("... imported");
                                }
                            },
                            Akka.system().dispatcher()
                    );

我收到了一个错误：

[info] play - Shutdown application default Akka system.
[info] play - datasource [jdbc:mysql://localhost/svp] bound to JNDI as DefaultDS
[info] play - datasource [jdbc:mysql://192.168.0.4/scrm_customer] bound to JNDI as CRM
[info] play - database [default] connected at jdbc:mysql://localhost/svp
[info] play - database [crm] connected at jdbc:mysql://192.168.0.4/scrm_customer
[info] play - Starting application default Akka system.
[info] play - Application started (Dev)
Importing CRM data...
[ERROR] [12/08/2014 15:57:04.773] [application-akka.actor.default-dispatcher-3] [TaskInvocation] No EntityManager bound to this thread. Try wrapping this call in JPA.withTransaction, or ensure that the HTTP context is setup on this thread.
java.lang.RuntimeException: No EntityManager bound to this thread. Try wrapping this call in JPA.withTransaction, or ensure that the HTTP context is setup on this thread.
        at play.db.jpa.JPA.em(JPA.java:55)
        at models.Customer.getByCrmId(Customer.java:185)
        at models.CustomerCRM.importCrmData(CustomerCRM.java:84)
        at actions.ImportCrmData.start(ImportCrmData.java:28)
        at Global$1.run(Global.java:40)
        at akka.actor.LightArrayRevolverScheduler$$anon$3$$anon$2.run(Scheduler.scala:241)
        at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:42)
        at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:386)
        at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
        at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
        at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
        at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)

请给我一些帮助。

我在java中使用了运行框架2.2.4

补充如下：

JPA.withTransaction(() -> {
    ImportCrmData.start();
});

我搞错了。

[info] Compiling 1 Java source to app/modules/common/target/scala-2.10/classes...
[error] app/modules/common/app/Global.java:38: error: illegal start of expression
[error]                                                 JPA.withTransaction(() -> {
[error]                                                                      ^
[error] app/modules/common/app/Global.java:38: error: illegal start of expression
[error]                                                 JPA.withTransaction(() -> {
[error]                                                                         ^
[error] app/modules/common/app/Global.java:38: error: illegal start of expression
[error]                                                 JPA.withTransaction(() -> {
[error]                                                                           ^
[error] app/modules/common/app/Global.java:38: error: ';' expected
[error]                                                 JPA.withTransaction(() -> {
[error]                                                                            ^
[error] app/modules/common/app/Global.java:39: error: illegal start of expression
[error]                                                     ImportCrmData.start();
[error]                                                                  ^
[error] app/modules/common/app/Global.java:39: error: ';' expected
[error]                                                     ImportCrmData.start();
[error]                                                                        ^
[error] app/modules/common/app/Global.java:40: error: illegal start of type
[error]                                                 });
[error]                                                  ^
[error] app/modules/common/app/Global.java:41: error: ')' expected
[error]                                             }
[error]                                              ^
[error] app/modules/common/app/Global.java:42: error: illegal start of expression
[error]                                         },
[error]                                          ^
[error] app/modules/common/app/Global.java:43: error: ';' expected
[error]                                         Akka.system().dispatcher()
[error]                                             ^
[error] app/modules/common/app/Global.java:43: error: ';' expected
[error]                                         Akka.system().dispatcher()
[error]                                                                   ^
[error] 11 errors
[error] (common/compile:compile) javac returned nonzero exit code

最后，我补充说：

                        public void run() {
                            JPA.withTransaction(
                                    ImportCrmData.start()
                                    );
                        }

java

persistence

akka

playframework-2.2

onstart

回答 1

Stack Overflow用户

回答已采纳

发布于 2014-12-08 15:21:03

删除@Transactional注释，它们只在控制器中有用。用JPA.withTransaction方法包装客户关系管理导入。Java 8语法：

JPA.withTransaction(() -> {
    ImportCrmData.start();
});

和非Java 8语法：

JPA.withTransaction(new Callback0() {

    @Override
    public void invoke() throws Throwable {
        ImportCrmData.start();
    }
});

票数 4

页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持

原文链接：

https://stackoverflow.com/questions/27360810

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