我在scala中运行字数统计程序时遇到异常。
Exception in thread "main" java.lang.NoSuchMethodError: scala.Predef$.refArrayOps([Ljava/lang/Object;)Lscala/collection/mutable/ArrayOps;
at org.apache.spark.util.Utils$.getCallSite(Utils.scala:1406)
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>Test</groupId>
<artifactId>Test</artifactId>
<version>1.0-SNAPSHOT</version>
<dependencies>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>2.1.0</version>
</dependency>
</dependencies>
</project>
和项目设置中的scala版本scala-sdk-2.11.8
不确定这里有什么问题。我在使用不同版本组合的maven资源库中花了相当多的时间。
从我的本地spark安装我通过运行命令scala.util.Properties.versionString找出了正确的scala版本
我为项目选择了相同的scala sdk。但没有运气。
非常感谢您的帮助。
答案 0 :(得分：0)
以下是一个工作的pom.xml，用于为spark应用程序创建超级jar。通过替换组和工件ID来使用它。
运行mvn clean package可以构建超级（单个）jar文件。
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.aravind.spark</groupId>
<artifactId>wordcount</artifactId>
<version>1.0.0-SNAPSHOT</version>
<name>${project.artifactId} ${project.version}</name>
<properties>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
<encoding>UTF-8</encoding>
<spark.core.version>2.0.2</spark.core.version>
<spark.sql.version>2.0.2</spark.sql.version>
<scala.tools.version>2.11</scala.tools.version>
<scala.version>2.11.8</scala.version>
</properties>
<dependencies>
<dependency>
<groupId>org.scala-lang</groupId>
<artifactId>scala-library</artifactId>
<version>${scala.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-core_2.11</artifactId>
<version>${spark.core.version}</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.apache.spark</groupId>
<artifactId>spark-sql_2.11</artifactId>
<version>${spark.sql.version}</version>
<scope>provided</scope>
</dependency>
</dependencies>
<build>
<sourceDirectory>src/main/scala</sourceDirectory>
<testSourceDirectory>src/test/scala</testSourceDirectory>
<pluginManagement>
<plugins>
<plugin>
<!-- see http://davidb.github.com/scala-maven-plugin -->
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
<version>3.2.1</version>
<executions>
<execution>
<goals>
<goal>compile</goal>
<goal>testCompile</goal>
</goals>
<configuration>
<args>
<arg>-dependencyfile</arg>
<arg>${project.build.directory}/.scala_dependencies</arg>
</args>
</configuration>
</execution>
</executions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
<version>2.19.1</version>
<configuration>
<useFile>false</useFile>
<disableXmlReport>true</disableXmlReport>
<!-- If you have classpath issue like NoDefClassError,... -->
<!-- useManifestOnlyJar>false</useManifestOnlyJar -->
<includes>
<include>**/*Test.*</include>
<include>**/*Suite.*</include>
</includes>
</configuration>
</plugin>
<plugin>
<artifactId>maven-assembly-plugin</artifactId>
<version>2.4.1</version>
<configuration>
<descriptorRefs>
<descriptorRef>jar-with-dependencies</descriptorRef>
</descriptorRefs>
</configuration>
<executions>
<execution>
<id>make-assembly</id>
<phase>package</phase>
<goals>
<goal>single</goal>
</goals>
</execution>
</executions>
</plugin>
<plugin>
<artifactId>maven-compiler-plugin</artifactId>
<configuration>
<source>${maven.compiler.source}</source>
<target>${maven.compiler.target}</target>
</configuration>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-surefire-plugin</artifactId>
</plugin>
<plugin>
<groupId>net.alchim31.maven</groupId>
<artifactId>scala-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-shade-plugin</artifactId>
<version>2.4.3</version>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>shade</goal>
</goals>
<configuration>
<transformers>
<!--transformer implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransformer">
<mainClass>your main job pipeline class</mainClass>
</transformer-->
</transformers>
<createDependencyReducedPom>false</createDependencyReducedPom>
<finalName>${project.artifactId}-${project.version}</finalName>
<artifactSet>
<excludes>
<exclude>org.scala-lang:scala-library</exclude>
<exclude>org.apache.spark:spark-core_2.10</exclude>
<exclude>log4j:log4j</exclude>
<exclude>org.slf4j:slf4j-api</exclude>
<exclude>ml-apis:xml-apis</exclude>
<exclude>org.apache.httpcomponents:httpclient</exclude>
<exclude>org.apache.httpcomponents:httpcore</exclude>
<exclude>commons-codec:commons-codec</exclude>
<exclude>org.apache.ant:ant</exclude>
<exclude>org.apache.ant:ant-junit</exclude>
<exclude>org.codehaus.jettison</exclude>
<exclude>stax:stax-api</exclude>
<exclude>commons-configuration:commons-configuration</exclude>
<exclude>commons-digester:commons-digester</exclude>
<exclude>commons-beanutils:*</exclude>
<exclude>com.google.code.findbugs:jsr305</exclude>
</excludes>
</artifactSet>
<filters>
<filter>
<artifact>*:*</artifact>
<excludes>
<exclude>META-INF/*.SF</exclude>
<exclude>META-INF/*.DSA</exclude>
<exclude>META-INF/*.RSA</exclude>
</excludes>
</filter>
</filters>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>
答案 1 :(得分：0)
我的整个体验都在Microsoft堆栈上。我刚开始探索Java技术。如果我在问题中问了一些错误，那么标记问题的人会通过提供解释为什么它被标记下来帮助我和社区..
我通过添加项目结构中的引用＆gt;使我的项目工作的任何方法;模块＆gt;依赖
这解决了这个问题。谢谢所有试图帮助我的人。
