maven 混合编译 java/scala 代码报错（qbit）

前言

• 技术栈

  Windows  10
  Java/JDK 1.8.0_202
  Maven    3.6.3
  spark    2.4.6
  scala    2.12
  hadoop   2.6.0-cdh5.10.0

• 操作系统中并没有安装 scala，利用 pom.xml 中的插件编译 scala 代码

报错现象

• 编译命令

  mvn -D maven.test.skip=true clean scala:compile compile package

• 报如下错误

  ......
  [ERROR] error: java.lang.StackOverflowError
  ......
  [INFO]  at scala.tools.nsc.javac.JavaScanners$JavaScanner.skipBlockComment(JavaScanners.scala:585)
  [INFO] ------------------------------------------------------------------------
  [INFO] BUILD FAILURE
  [INFO] ------------------------------------------------------------------------
  [INFO] Total time:  12.495 s
  [INFO] Finished at: 2023-03-20T13:56:52+08:00
  [INFO] ------------------------------------------------------------------------
  [ERROR] Failed to execute goal net.alchim31.maven:scala-maven-plugin:3.4.6:compile (default-cli) on project DataAnalysis_aws_smartlib: wrap: org.apache.commons.exec.ExecuteException: Process exited with an error: -10000 (Exit value: -10000) -> [Help 1]
  [ERROR]
  [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
  [ERROR] Re-run Maven using the -X switch to enable full debug logging.
  [ERROR]
  [ERROR] For more information about the errors and possible solutions, please read the following articles:
  [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

解决办法

• 给编译插件添加 jvm 参数 jvmArg，添加后 scala-maven-plugin 插件完整配置如下

  <plugin>
    <groupId>net.alchim31.maven</groupId>
    <artifactId>scala-maven-plugin</artifactId>
    <version>3.4.6</version>
    <executions>
        <execution>
            <id>scala-compile-first</id>
            <phase>process-resources</phase>
            <goals>
                <goal>add-source</goal>
                <goal>compile</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <jvmArgs>
            <!-- 指定 scala 编译时栈大小 -->
            <jvmArg>-Xss4m</jvmArg>
        </jvmArgs>
        <scalaVersion>${scala.version}</scalaVersion>
    </configuration>
  </plugin>

• scala-maven-plugin 插件 GitHub 地址：https://github.com/davidB/scala-maven-plugin

相关阅读

• JVM 参数及默认值

  -Xms
  指定jvm堆的初始大小，默认为物理内存的1/64，最小为1M；
  可以指定单位，比如k、m，若不指定，则默认为字节。
  
  -Xmx
  指定jvm堆的最大值，默认为物理内存的1/4或者1G，最小为2M；单位与-Xms一致。
  
  -Xss
  设置单个线程栈的大小，一般默认为512k。

本文出自 qbit snap