解决scala写akka代码编译出错的问题

落日映苍穹つ 2021-12-14 11:17 270阅读 0赞

我用idea的maven创建了一个scala项目，并用他写了akka代码，结果反复报两个错：

java.lang.NoClassDefFoundError: scala/Product$class

java.lang.NoSuchMethodError: scala.collection.immutable.HashSet$.empty()Lscala/collection/immutable/HashSet;

查了很多都没有解决问题，最后找到了老师的pom文件，复制了一下问题就解决了

<properties>
            <encoding>UTF-8</encoding>
            <scala.version>2.12.3</scala.version>
            <scala.compat.version>2.12</scala.compat.version>
            <akka.version>2.4.17</akka.version>
        </properties>
    
    
        <dependencies>
        
        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-library</artifactId>
            <version>${scala.version}</version>
        </dependency>
    
        
        <dependency>
            <groupId>com.typesafe.akka</groupId>
            <artifactId>akka-actor_${scala.compat.version}</artifactId>
            <version>${akka.version}</version>
        </dependency>
    
        
    
            <dependency>
                <groupId>com.typesafe.akka</groupId>
                <artifactId>akka-remote_${scala.compat.version}</artifactId>
                <version>${akka.version}</version>
            </dependency>
        </dependencies>
    
        
        <build>
        
        <sourceDirectory>src/main/scala</sourceDirectory>
        <testSourceDirectory>src/test/scala</testSourceDirectory>
        <plugins>
        
        <plugin>
            <groupId>net.alchim31.maven</groupId>
            <artifactId>scala-maven-plugin</artifactId>
            <version>3.2.2</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-shade-plugin</artifactId>
        <version>2.4.3</version>
        <executions>
        <execution>
        <phase>package</phase>
        <goals>
    
            <goal>shade</goal>
        </goals>
            <configuration>
                <filters>
                    <filter>
                        <artifact>*:*</artifact>
                        <excludes>
                            <exclude>META-INF/*.SF</exclude>
                            <exclude>META-INF/*.DSA</exclude>
                            <exclude>META-INF/*.RSA</exclude>
                        </excludes>
                    </filter>
                </filters>
                <transformers>
                    <transformer  implementation="org.apache.maven.plugins.shade.resource.AppendingTransformer">
                        <resource>reference.conf</resource>
                    </transformer>
                    
                    <transformer  implementation="org.apache.maven.plugins.shade.resource.ManifestResourceTransfor mer">
                        <mainClass></mainClass>
                    </transformer>
                </transformers>
            </configuration>
        </execution>
        </executions>
        </plugin>
        </plugins>
        </build>