大佬教程收集整理的这篇文章主要介绍了播放框架Mailer在maile.send（）方法上抛出NullPointerException，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
看来您未正确初始化@H_247_3@mailerClIEnt。
该示例显示您需要将其注入到控制器中，该控制器本身由Play框架初始化。
您将其注入自己的@H_247_3@mailerservice班级。我想，你这样做new
Mailerservice()的controllers.Application.sendMailTest。结果，@H_247_3@mailerClIEnt不会注入到@H_247_3@mailerservice类中（如果您初始化@H_247_3@mailerservice自己，谁会这样做？）
解决方案：您需要@H_247_3@mailerClIEnt像示例中一样注入控制器，然后将其传递给您的@H_247_3@mailerservice类。
import play.libs.mailer.Email;
import play.libs.mailer.MailerClIEnt;
public class Mailerservice {
MailerClIEnt mailerClIEnt;
public Mailerservice(MailerClIEnt mailerClIEnt){
this.mailerClIEnt = mailerClIEnt;
}
public voID sendEmail() {
Email email = new Email();
email.setSubject("Activation link");
email.setFrom("from@gmail.com");
email.addTo("to@gmail.com");
email.setbodyText("Hello");
mailerClIEnt.send(email);
}
}
我正在使用Play Mailer模块。我在 @H_837_37@mailerClient.send（email） 处收到NullPointerException 。
发送邮件代码
import javax.inject.Inject;
import play.libs.mailer.Email;
import play.libs.mailer.MailerClient;
public class Mailerservice {
@Inject MailerClient mailerClient;
public void sendEmail() {
Email email = new Email();
email.setSubject("Activation Link");
email.setFrom("from@gmail.com");
email.addTo("to@gmail.com");
email.setBodyText("Hello");
mailerClient.send(email);
}
}
application.conf
# Logger provided to your application:
logger.application=DEBUG
play{
modules {
enabled += "play.api.libs.mailer.MailerModule"
#enabled += "play.api.libs.mailer.SMTPConfigurationModule"
}
mailer {
host=smtp.gmail.com
port=465
ssl=yes
tls=no
user="my gmail username"
password="gmail password"
debug=yes
}
}
我也有加入 “com.typesafe.play” %%“播放邮件”％“3.0.1” 在build.sbt
播放版本：-2.4
Java版本：1.8
我正在添加堆栈跟踪
play.api.http.httpErrorHandlerExceptions$$anon$1: Execution exception[[NullPointerException: null]]
at play.api.http.httpErrorHandlerExceptions$.throwableToUsefulException(httpErrorHandler.scala:265) ~[play_2.11-2.4.6.jar:2.4.6]
at play.api.http.DefaulthttpErrorHandler.onServerError(httpErrorHandler.scala:191) ~[play_2.11-2.4.6.jar:2.4.6]
at play.api.GlobalSetTings$class.onError(GlobalSetTings.scala:179) [play_2.11-2.4.6.jar:2.4.6]
at play.api.DefaultGlobal$.onError(GlobalSetTings.scala:212) [play_2.11-2.4.6.jar:2.4.6]
at play.api.http.GlobalSetTingshttpErrorHandler.onServerError(httpErrorHandler.scala:94) [play_2.11-2.4.6.jar:2.4.6]
at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$9$$anonfun$apply$1.applyOrElse(PlayDefaultUpstreamHandler.scala:151) [play-netty-server_2.11-2.4.6.jar:2.4.6]
at play.core.server.netty.PlayDefaultUpstreamHandler$$anonfun$9$$anonfun$apply$1.applyOrElse(PlayDefaultUpstreamHandler.scala:148) [play-netty-server_2.11-2.4.6.jar:2.4.6]
at scala.runtime.AbstractPartialFunction.apply(AbstractPartialFunction.scala:36) [scala-library-2.11.6.jar:na]
at scala.util.Failure$$anonfun$recover$1.apply(Try.scala:215) [scala-library-2.11.6.jar:na]
at scala.util.Try$.apply(Try.scala:191) [scala-library-2.11.6.jar:na]
at scala.util.Failure.recover(Try.scala:215) [scala-library-2.11.6.jar:na]
at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:324) [scala-library-2.11.6.jar:na]
at scala.concurrent.Future$$anonfun$recover$1.apply(Future.scala:324) [scala-library-2.11.6.jar:na]
at scala.concurrent.impl.CallBACkRunnable.run(Promise.scala:32) [scala-library-2.11.6.jar:na]
at play.api.libs.iteratee.Execution$trampoline$.executescheduled(Execution.scala:109) [play-iteratees_2.11-2.4.6.jar:2.4.6]
at play.api.libs.iteratee.Execution$trampoline$.execute(Execution.scala:71) [play-iteratees_2.11-2.4.6.jar:2.4.6]
at scala.concurrent.impl.CallBACkRunnable.executeWithValue(Promise.scala:40) [scala-library-2.11.6.jar:na]
at scala.concurrent.impl.Promise$DefaultPromise.tryComplete(Promise.scala:248) [scala-library-2.11.6.jar:na]
at scala.concurrent.Promise$class.complete(Promise.scala:55) [scala-library-2.11.6.jar:na]
at scala.concurrent.impl.Promise$DefaultPromise.complete(Promise.scala:153) [scala-library-2.11.6.jar:na]
at scala.concurrent.impl.Future$PromiseCompleTingRunnable.run(Future.scala:23) [scala-library-2.11.6.jar:na]
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:40) [akka-actor_2.11-2.3.13.jar:na]
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(AbstractDispatcher.scala:397) [akka-actor_2.11-2.3.13.jar:na]
at scala.concurrent.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260) [scala-library-2.11.6.jar:na]
at scala.concurrent.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339) [scala-library-2.11.6.jar:na]
at scala.concurrent.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979) [scala-library-2.11.6.jar:na]
at scala.concurrent.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107) [scala-library-2.11.6.jar:na]
**Caused by: java.lang.NullPointerException: null**
at mailer.Mailerservice.sendEmail(Mailerservice.java:17) ~[classes/:na]
at controllers.Application.sendMailTest(Application.java:14) ~[classes/:na]
at router.Routes$$anonfun$routes$1$$anonfun$applyOrElse$10$$anonfun$apply$10.apply(Routes.scala:324) ~[classes/:na]
at router.Routes$$anonfun$routes$1$$anonfun$applyOrElse$10$$anonfun$apply$10.apply(Routes.scala:324) ~[classes/:na]
at play.core.routIng.HandlerInvokerFactory$$anon$4.resultCall(HandlerInvoker.scala:136) ~[play_2.11-2.4.6.jar:2.4.6]
at play.core.routIng.HandlerInvokerFactory$JavaActionInvokerFactory$$anon$14$$anon$3$$anon$1.invocation(HandlerInvoker.scala:127) ~[play_2.11-2.4.6.jar:2.4.6]
at play.core.j.JavaAction$$anon$1.call(JavaAction.scala:70) ~[play_2.11-2.4.6.jar:2.4.6]
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