前言

本文隶属于专栏《1000个问题搞定大数据技术体系》,该专栏为笔者原创,引用请注明来源,不足和错误之处请在评论区帮忙指出,谢谢!

本专栏目录结构和参考文献请见1000个问题搞定大数据技术体系

正文

WHY

如果你开发过 Scala 工程,那么你可能被 Java 和 Scala 的混合编译苦恼过。

如果你搜索了网上其他的 Java 和 Scala 混合编译文档,那么你可能被坑过,不是 Java 没法编译,就是 Scala 没法编译,还有可能都无法编译。。

WHAT

下面的示例代码参考自 Apache Spark(3.2.0) 的源码,你尽可以将它拷贝到你的 maven 工程中。

如果你对 Apache Spark 不陌生的话,就明白它就是属于 Java 和 Scala 混合编译的 maven 工程,并且经历了诸多大厂的生产检验。

pom.xml

<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/maven-v4_0_0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <groupId>com.shockang.study</groupId>
    <artifactId>algorithm</artifactId>
    <version>1.0-SNAPSHOT</version>
    <properties>
        <java.version>1.8</java.version>
        <scala.version>2.12.15</scala.version>

        <junit.version>5.8.1</junit.version>

        <scala-maven-plugin.version>4.3.0</scala-maven-plugin.version>
        <maven-compiler-plugin.version>3.8.1</maven-compiler-plugin.version>
    </properties>

    <dependencies>
        <!-- scala start -->
        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-compiler</artifactId>
            <version>${scala.version}</version>
        </dependency>
        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-reflect</artifactId>
            <version>${scala.version}</version>
        </dependency>
        <dependency>
            <groupId>org.scala-lang</groupId>
            <artifactId>scala-library</artifactId>
            <version>${scala.version}</version>
        </dependency>
        <!-- scala end -->

        <!-- test start -->
        <dependency>
            <groupId>org.junit.jupiter</groupId>
            <artifactId>junit-jupiter-api</artifactId>
            <version>${junit.version}</version>
            <scope>test</scope>
        </dependency>
        <!-- test end -->

    </dependencies>

    <build>
        <plugins>
            <!-- 以下 plugin 配置参考 Apache Spark 3.2.0 -->
            <plugin>
                <groupId>net.alchim31.maven</groupId>
                <artifactId>scala-maven-plugin</artifactId>
                <version>${scala-maven-plugin.version}</version>
                <executions>
                    <execution>
                        <id>eclipse-add-source</id>
                        <goals>
                            <goal>add-source</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>scala-compile-first</id>
                        <goals>
                            <goal>compile</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>scala-test-compile-first</id>
                        <goals>
                            <goal>testCompile</goal>
                        </goals>
                    </execution>
                    <execution>
                        <id>attach-scaladocs</id>
                        <phase>verify</phase>
                        <goals>
                            <goal>doc-jar</goal>
                        </goals>
                    </execution>
                </executions>
                <configuration>
                    <scalaVersion>${scala.version}</scalaVersion>
                    <checkMultipleScalaVersions>true</checkMultipleScalaVersions>
                    <failOnMultipleScalaVersions>true</failOnMultipleScalaVersions>
                    <recompileMode>incremental</recompileMode>
                    <args>
                        <arg>-unchecked</arg>
                        <arg>-deprecation</arg>
                        <arg>-feature</arg>
                        <arg>-explaintypes</arg>
                        <arg>-target:jvm-${java.version}</arg>
                        <arg>-Xfatal-warnings</arg>
                        <arg>-Ywarn-unused:imports</arg>
                        <arg>-P:silencer:globalFilters=.*deprecated.*</arg>
                    </args>
                    <jvmArgs>
                        <jvmArg>-Xss128m</jvmArg>
                        <jvmArg>-Xms4g</jvmArg>
                        <jvmArg>-Xmx6g</jvmArg>
                        <jvmArg>-XX:MaxMetaspaceSize=2g</jvmArg>
                        <jvmArg>-XX:ReservedCodeCacheSize=4g</jvmArg>
                    </jvmArgs>
                    <javacArgs>
                        <javacArg>-source</javacArg>
                        <javacArg>${java.version}</javacArg>
                        <javacArg>-target</javacArg>
                        <javacArg>${java.version}</javacArg>
                        <javacArg>-Xlint:all,-serial,-path,-try</javacArg>
                    </javacArgs>
                    <compilerPlugins>
                        <compilerPlugin>
                            <groupId>com.github.ghik</groupId>
                            <artifactId>silencer-plugin_${scala.version}</artifactId>
                            <version>1.7.6</version>
                        </compilerPlugin>
                    </compilerPlugins>
                </configuration>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>${maven-compiler-plugin.version}</version>
                <configuration>
                    <source>${java.version}</source>
                    <target>${java.version}</target>
                    <skipMain>true</skipMain> <!-- skip compile -->
                    <skip>true</skip> <!-- skip testCompile -->
                </configuration>
            </plugin>
        </plugins>
    </build>

</project>

上面的源码来自我的 github 开源项目 algorithm,你可以从我的这篇博客了解具体情况——LeetCode 刷题汇总

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