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我目前正在使用我的java play framework服务器和JPA来设置MongoDB。现在我有一个错误，从而与@Transactional任何注释的功能得到这个错误：使用Mongodb配置Hibernate“试图删除EntityManager，但没有设置”
play.api.http.HttpErrorHandlerExceptions$$anon$1: Execution exception[[CompletionException: java.lang.IllegalStateException: Tried to remove the EntityManager, but none was set.]]
at play.api.http.HttpErrorHandlerExceptions$.throwableToUsefulException(HttpErrorHandler.scala:293)
at play.api.http.DefaultHttpErrorHandler.onServerError(HttpErrorHandler.scala:220)
at play.api.GlobalSettings$class.onError(GlobalSettings.scala:160)
at play.api.DefaultGlobal$.onError(GlobalSettings.scala:188)
at play.api.http.GlobalSettingsHttpErrorHandler.onServerError(HttpErrorHandler.scala:100)
at play.core.server.netty.PlayRequestHandler$$anonfun$2$$anonfun$apply$1.applyOrElse(PlayRequestHandler.scala:100)
at play.core.server.netty.PlayRequestHandler$$anonfun$2$$anonfun$apply$1.applyOrElse(PlayRequestHandler.scala:99)
at scala.concurrent.Future$$anonfun$recoverWith$1.apply(Future.scala:346)
at scala.concurrent.Future$$anonfun$recoverWith$1.apply(Future.scala:345)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
Caused by: java.util.concurrent.CompletionException: java.lang.IllegalStateException: Tried to remove the EntityManager, but none was set.
at java.util.concurrent.CompletableFuture.encodeThrowable(CompletableFuture.java:292)
at java.util.concurrent.CompletableFuture.completeThrowable(CompletableFuture.java:308)
at java.util.concurrent.CompletableFuture.uniApply(CompletableFuture.java:593)
at java.util.concurrent.CompletableFuture$UniApply.tryFire(CompletableFuture.java:577)
at java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:474)
at java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:1977)
at scala.concurrent.java8.FuturesConvertersImpl$CF.apply(FutureConvertersImpl.scala:21)
at scala.concurrent.java8.FuturesConvertersImpl$CF.apply(FutureConvertersImpl.scala:18)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:32)
at scala.concurrent.BatchingExecutor$Batch$$anonfun$run$1.processBatch$1(BatchingExecutor.scala:63)
Caused by: java.lang.IllegalStateException: Tried to remove the EntityManager, but none was set.
at play.db.jpa.JPAEntityManagerContext.pop(JPAEntityManagerContext.java:74)
at play.db.jpa.DefaultJPAApi.withTransaction(DefaultJPAApi.java:155)
at play.db.jpa.DefaultJPAApi.withTransaction(DefaultJPAApi.java:195)
at play.db.jpa.TransactionalAction.call(TransactionalAction.java:25)
at play.core.j.JavaAction$$anonfun$7.apply(JavaAction.scala:108)
at play.core.j.JavaAction$$anonfun$7.apply(JavaAction.scala:108)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.liftedTree1$1(Future.scala:24)
at scala.concurrent.impl.Future$PromiseCompletingRunnable.run(Future.scala:24)
at play.core.j.HttpExecutionContext$$anon$2.run(HttpExecutionContext.scala:56)
at play.api.libs.iteratee.Execution$trampoline$.execute(Execution.scala:70)
这个错误发生当且仅当我的方法上有@Transactional。
我加入了正确的依赖关系build.sbt：
libraryDependencies += javaJpa
libraryDependencies += "org.hibernate.ogm" % "hibernate-ogm-core" % "5.0.0.Final"
libraryDependencies += "org.hibernate.ogm" % "hibernate-ogm-mongodb" % "5.0.0.Final"
我配置的conf/META-INF/persitence.xml：
<persistence xmlns="http://xmlns.jcp.org/xml/ns/persistence"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd"
version="2.1">
<persistence-unit name="defaultPersistenceUnit" transaction-type="JTA">
<provider>org.hibernate.ogm.jpa.HibernateOgmPersistence</provider>
<non-jta-data-source>DefaultDS</non-jta-data-source>
<properties>
<property name="hibernate.ogm.datastore.provider"
value="org.hibernate.ogm.datastore.mongodb.impl.MongoDBDatastoreProvider"/>
<property name="hibernate.ogm.datastore.host" value="127.0.0.1"/>
<property name="hibernate.ogm.datastore.port" value="27017"/>
<property name="hibernate.ogm.datastore.database" value="[DB name here]"/>
<property name="hibernate.ogm.datastore.safe" value="true"/>
</properties>
</persistence-unit>
</persistence>
并设置我的默认持久性单元中的conf/application.conf：
jpa.default=defaultPersistenceUnit
这里是我的样本方法：
@Transactional()
public Result put() {
Test tmp = play.libs.Json.fromJson(request().body().asJson(), Test.class);
JPA.em().persist(tmp);
return ok(play.libs.Json.toJson(tmp));
}