小编The*_*ark的帖子

我收到此错误的原因是什么？最初,Scala的IDE插件是2.12.3.但由于我正在使用Spark 2.2.0,我手动将其更改为Scala 2.11.11.

Using Spark's default log4j profile: org/apache/spark/log4j-defaults.properties
17/09/19 12:08:19 WARN NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
Exception in thread "main" java.lang.NoSuchMethodError: scala.Product.$init$(Lscala/Product;)V
    at scala.xml.Null$.<init>(Null.scala:23)
    at scala.xml.Null$.<clinit>(Null.scala)
    at org.apache.spark.ui.jobs.AllJobsPage.<init>(AllJobsPage.scala:39)
    at org.apache.spark.ui.jobs.JobsTab.<init>(JobsTab.scala:38)
    at org.apache.spark.ui.SparkUI.initialize(SparkUI.scala:67)
    at org.apache.spark.ui.SparkUI.<init>(SparkUI.scala:84)
    at org.apache.spark.ui.SparkUI$.create(SparkUI.scala:221)
    at org.apache.spark.ui.SparkUI$.createLiveUI(SparkUI.scala:163)
    at org.apache.spark.SparkContext.<init>(SparkContext.scala:452)
    at sparkEnvironment$.<init>(Ticket.scala:33)
    at sparkEnvironment$.<clinit>(Ticket.scala)
    at Ticket$.main(Ticket.scala:39)
    at Ticket.main(Ticket.scala)

我对Laravel很新,当我遇到这个错误时,我正在阅读教程.这是我在'testController.php'中的代码.

<?php

namespace app\Http\Controllers;

use app\Http\Controllers\Controller;

class testController extends \app\Http\Controllers\Controller {

public function getAbout()
{
    return view('Learning.about') ;
}

public function getHome()
{
    return view('Learning.index');
}

}

这是我的'routes.php'.

<?php
Route::get('test', [
   'as' => 'test', 
   'uses' => 'testController@getHome',
]);

Route::get('about', [
    'as' => 'about', 
    'uses' => 'testController@getAbout',
]);

我收到此错误:

未找到类'app\Http\Controllers\Controller'

我该如何解决这个错误？

快速帮助解决这个问题。在编译期间，我收到以下错误集；

Error:(38, 21) Symbol 'type shapeless.HListerAux' is missing from the classpath.
This symbol is required by 'value spray.routing.directives.ParamDefMagnet2.hla'.
Make sure that type HListerAux is in your classpath and check for conflicting dependencies with `-Ylog-classpath`.
A full rebuild may help if 'ParamDefMagnet2.class' was compiled against an incompatible version of shapeless.
          parameter('id) { id =>

Error:(38, 21) Symbol 'type shapeless.Poly.Case2' is missing from the classpath.
This symbol is required by 'method spray.routing.directives.ParamDefMagnet2.MapReduce.from'.
Make sure that type Case2 is in your classpath and …