Eclipse Scala环境的配置

╰+哭是因爲堅強的太久メ 2022-02-20 06:21 451阅读 0赞

### 前言 ###

要开发`Scala`程序, 一般使用的`IDE`主要有3种:

*  NetBean
 *  Eclipse
 *  IDEA

由于个人不太习惯`IDEA`的一些使用功能, 已经只能打开一个项目.(这可太蠢了.)  
所以, 继续选择在`Eclipse IDE`上集成`Scala IDE`. 当然, 官方提供了`Scala IDE`, 可以直接使用. 但是, 如果你之前哟一个版本的`Eclipse`的话, 个人建议还是升级比较好.

--------------------

### 基础知识 ###

关于`Eclipse 插件的安装和卸载`建议看下我的这篇文章[Eclipse 插件管理][Eclipse].

--------------------

### 基本操作 ###

主要安装2项东西: `scala-IDE`与`m2e-scala模版`.

`Scala IDE`可以选择离线安装与在线安装.

*  在线安装(市场安装)  
    注意: `Eclipse`有的版本没有这个, 你可以选择离线安装.  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70]
 *  在线安装 选择地址(Oxgen):  
    [http://download.scala-ide.org/sdk/lithium/e47/scala212/stable/site][http_download.scala-ide.org_sdk_lithium_e47_scala212_stable_site]  
    注意: 相应版本的插件地址, 建议官网查看一下.  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 1]
 *  离线安装: [http://scala-ide.org/download/prev-stable.html][http_scala-ide.org_download_prev-stable.html]  
    解压压缩包, 随后安装即可.  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 2]
 *  安装`m2e-scala`  
    在`Maven`项目内识别`scala`程序. 下载地址:  
    [http://alchim31.free.fr/m2e-scala/update-site/][http_alchim31.free.fr_m2e-scala_update-site]  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 3]
 *  在线安装(同上 输入 `m2e-scala`/`http://alchim31.free.fr/m2e-scala/update-site/`)  
    这个地址国内被墙了, 而且貌似`jar`包名字多一个空格.(真坑)
 *  离线安装(同上 `Scala-IDE`)  
    我已经上传到`CSDN`上了, 当然你也可以翻墙将上面的东西下载下来. 离线安装即可.

--------------------

### `Scala`环境配置 ###

*  选择适合的`Scala版本`  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 4]
 *  配置`Scala`到`build path`.  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 5]
 *  测试程序运行  
    创建`Hello.scala`, 运行.

object Hello2 {
      def main(args: Array[String]): Unit = {
            println("123")
      }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 6]  
注意, 如果没有`Run as Scala Application`. 原因有2个:

*  `Scala-IDE`插件配置错误;
 *  代码或包错误.

另: 官方的这个操作教学视频还可以, 大家有兴趣可以看看. 相关地址: [http://scala-ide.org/download/current.html][http_scala-ide.org_download_current.html]

--------------------

### Others ###

代码补齐报错.`An internal error occurred during: "Computing additional info"`.  
解决办法: 更换版本 / 不使用代码补全功能.(这个问题非常恶心)  
\[10\]. [eclipse安装Scala IDE插件及An internal error occurred during: "Computing additional info"报错解决][eclipse_Scala IDE_An internal error occurred during_ _Computing additional info]

--------------------

### Maven ###

在使用模版创建完成后, 发现并不好用. `Scala`使用的依赖类库需要跟随自己的使用进行升级.

# 原版
    <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.yanxml</groupId>
      <artifactId>quick-scala</artifactId>
      <version>0.0.1-SNAPSHOT</version>
      <name>${project.artifactId}</name>
      <description>My wonderfull scala app</description>
      <inceptionYear>2010</inceptionYear>
      <licenses>
        <license>
          <name>My License</name>
          <url>http://....</url>
          <distribution>repo</distribution>
        </license>
      </licenses>
    
      <properties>
        <maven.compiler.source>1.6</maven.compiler.source>
        <maven.compiler.target>1.6</maven.compiler.target>
        <encoding>UTF-8</encoding>
        <scala.tools.version>2.10</scala.tools.version>
        <scala.version>2.10.0</scala.version>
      </properties>
    
      <dependencies>
        <dependency>
          <groupId>org.scala-lang</groupId>
          <artifactId>scala-library</artifactId>
          <version>${scala.version}</version>
        </dependency>
    
        
        <dependency>
          <groupId>junit</groupId>
          <artifactId>junit</artifactId>
          <version>4.11</version>
          <scope>test</scope>
        </dependency>
        <dependency>
          <groupId>org.specs2</groupId>
          <artifactId>specs2_${scala.tools.version}</artifactId>
          <version>1.13</version>
          <scope>test</scope>
        </dependency>
        <dependency>
          <groupId>org.scalatest</groupId>
          <artifactId>scalatest_${scala.tools.version}</artifactId>
          <version>2.0.M6-SNAP8</version>
          <scope>test</scope>
        </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>3.1.3</version>
            <executions>
              <execution>
                <goals>
                  <goal>compile</goal>
                  <goal>testCompile</goal>
                </goals>
                <configuration>
                  <args>
                    <arg>-make:transitive</arg>
                    <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>2.13</version>
            <configuration>
              <useFile>false</useFile>
              <disableXmlReport>true</disableXmlReport>
              
              
              <includes>
                <include>**/*Test.*</include>
                <include>**/*Suite.*</include>
              </includes>
            </configuration>
          </plugin>
        </plugins>
      </build>
    </project>

# 更新版本
    <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.yanxml</groupId>
    	<artifactId>quick-scala</artifactId>
    	<version>0.0.1-SNAPSHOT</version>
    	<name>${project.artifactId}</name>
    	<description>My wonderfull scala app</description>
    	<inceptionYear>2010</inceptionYear>
    	<licenses>
    		<license>
    			<name>My License</name>
    			<url>http://....</url>
    			<distribution>repo</distribution>
    		</license>
    	</licenses>
    
    	<properties>
    		<maven.compiler.source>1.8</maven.compiler.source>
    		<maven.compiler.target>1.8</maven.compiler.target>
    		<encoding>UTF-8</encoding>
    		<scala.tools.version>2.11</scala.tools.version>
    		<scala.version>2.11.8</scala.version>
    	</properties>
    
    	<dependencies>
    		
    		<dependency>
    			<groupId>org.apache.commons</groupId>
    			<artifactId>commons-lang3</artifactId>
    			<version>3.7</version>
    		</dependency>
    		<dependency>
    			<groupId>org.scala-lang</groupId>
    			<artifactId>scala-library</artifactId>
    			<version>${scala.version}</version>
    		</dependency>
    
    
    
    		<dependency>
    			<groupId>org.scala-lang</groupId>
    			<artifactId>scala-library</artifactId>
    			<version>2.11.8</version>
    		</dependency>
    		<dependency>
    			<groupId>org.scala-lang</groupId>
    			<artifactId>scala-compiler</artifactId>
    			<version>2.11.8</version>
    		</dependency>
    		<dependency>
    			<groupId>org.scala-lang</groupId>
    			<artifactId>scala-reflect</artifactId>
    			<version>2.11.8</version>
    		</dependency>
    		
    		<dependency>
    			<groupId>org.scala-lang</groupId>
    			<artifactId>scala-actors</artifactId>
    			<version>2.11.8</version>
    		</dependency>
    		
    		<dependency>
    			<groupId>junit</groupId>
    			<artifactId>junit</artifactId>
    			<version>4.11</version>
    			<scope>test</scope>
    		</dependency>
    		
    		
    		<dependency>
    			<groupId>org.scalatest</groupId>
    			<artifactId>scalatest_2.11</artifactId>
    			<version>3.0.0-M16-SNAP6</version>
    			<scope>test</scope>
    		</dependency>
    
    		<dependency>
    			<groupId>org.scalatest</groupId>
    			<artifactId>scalatest_${scala.tools.version}</artifactId>
    			<version>3.0.0-M16-SNAP6</version>
    			<scope>test</scope>
    		</dependency>
    
    		
    		<dependency>
    			<groupId>org.apache.spark</groupId>
    			<artifactId>spark-core_2.11</artifactId>
    			<version>2.2.1</version>
    		</dependency>
    
    		
    		
    		<dependency>
    			<groupId>com.typesafe.akka</groupId>
    			<artifactId>akka-actor_2.11</artifactId>
    			<version>2.3.14</version>
    		</dependency>
    		
    		<dependency>
    			<groupId>com.typesafe.akka</groupId>
    			<artifactId>akka-remote_2.11</artifactId>
    			<version>2.3.14</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>3.1.3</version>
    				<executions>
    					<execution>
    						<goals>
    							<goal>compile</goal>
    							<goal>testCompile</goal>
    						</goals>
    						<configuration>
    							<args>
    								<arg>-make:transitive</arg>
    								<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>2.13</version>
    				<configuration>
    					<useFile>false</useFile>
    					<disableXmlReport>true</disableXmlReport>
    					
    					
    					<includes>
    						<include>**/*Test.*</include>
    						<include>**/*Suite.*</include>
    					</includes>
    				</configuration>
    			</plugin>
    		</plugins>
    	</build>
    </project>

> Q1:
> 
>     Description	Resource	Path	Location	Type
>     missing or invalid dependency detected while loading class file 'JsonBaseMatchers.class'. Could not access term parsing in package scala.util, because it (or its dependencies) are missing. Check your build definition for missing or conflicting dependencies. (Re-run with `-Ylog-classpath` to see the problematic classpath.) A full rebuild may help if 'JsonBaseMatchers.class' was compiled against an incompatible version of scala.util. (NOTE: It looks like the scala-parser-combinators module is missing; try adding a dependency on "org.scala-lang.modules" : "scala-parser-combinators".        See http://docs.scala-lang.org/overviews/ for more information.)	quick-scala		Unknown	Scala Problem
> 
> A1: 更新Maven依赖类库的版本.  
> [scala-eclipse-maven环境搭建][scala-eclipse-maven]

> Q2: Eclipse 内无法读取Scala源码. 无法解决! 这个问题是为什么那么多人无奈选择`IDEA`的原因. 至于其他的部分源码, 可以使用反编译工具. 个人感觉可以内嵌`Scala`反编译工具到Eclipse里面即可.(感觉个人有兴趣,可以开发一个.)
> 
> 1.  [在eclipse中添加jdk源码][eclipse_jdk]
> 2.  [eclipse 关联源码的两种方式][eclipse]
> 3.  [spark最新源码下载并导入到开发环境下助推高质量代码(Scala IDEA for Eclipse和IntelliJ IDEA皆适用）（以spark2.2.0源码包为例）（图文详解）][spark_Scala IDEA for Eclipse_IntelliJ IDEA_spark2.2.0]
> 4.  [attaching-sources-in-intellij-idea-for-scala-project][]
> 5.  [intellij idea查看scala sdk的源代码][intellij idea_scala sdk]
> 6.  [Eclipse安装反编译插件][Eclipse 1]
> 7.  [MyEclipse中android 项目如何解决第三方jar无法关联源码的问题（ The JAR of this class file belongs to container ‘Android Private Libraries’ which does not allow modifications to source attachments on its entries.][MyEclipse_android _jar_ The JAR of this class file belongs to container _Android Private Libraries_ which does not allow modifications to source attachments on its entries.]
> 8.  [running-spark-on-eclipse-in-linux][]
> 9.  [importing-spark-source-code-to-eclipse-ide][]
> 10. [用Eclipse开发Spark应用，如何跟踪Spark源代码][Eclipse_Spark_Spark]
> 11. [eclipse不识别scala代码][eclipse_scala]
> 12. [Eclipse中如何关联源码？][Eclipse 2]
> 13. [scala ide for eclipse搭建spark源码阅读环境报错][scala ide for eclipse_spark]
> 14. [Eclipse中Maven引入依赖后自动下载并关联源码(Source)][Eclipse_Maven_Source]

--------------------

### Reference ###

\[1\]. [Offical - Scala IDE ][http_scala-ide.org_download_current.html]  
\[2\]. [Offical - m2e-scala][http_alchim31.free.fr_m2e-scala_update-site]  
\[3\]. [eclipse安装scala环境][eclipse_scala 1]  
\[4\]. [在eclipse中如何配置运行Scala？][eclipse_Scala]  
\[5\]. [eclipse安装scala][eclipse_scala 2]  
\[6\]. [分别用Eclipse和IDEA搭建Scala+Spark开发环境][Eclipse_IDEA_Scala_Spark]  
\[7\]. [maven插件(3) - scala插件scala-maven-plugin][maven_3_ - scala_scala-maven-plugin]  
\[8\]. [Scala之——Eclipse离线手动安装Scala插件][Scala_Eclipse_Scala]  
\[9\]. [There is “Run Configuration” but no “Run As Scala Application” in Eclipse][There is _Run Configuration_ but no _Run As Scala Application_ in Eclipse]  
\[10\]. [eclipse安装Scala IDE插件及An internal error occurred during: "Computing additional info"报错解决][eclipse_Scala IDE_An internal error occurred during_ _Computing additional info]  
\[11\]. [编写代码时，每打一个字符就会弹出“Computing additional info”.Could not initialize class…][Computing additional info_.Could not initialize class]

[Eclipse]: https://blog.csdn.net/u010416101/article/details/89250212
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70]: /images/20220220/c47c9926efd447329ac2e545f3f6d1b3.png
[http_download.scala-ide.org_sdk_lithium_e47_scala212_stable_site]: http://download.scala-ide.org/sdk/lithium/e47/scala212/stable/site
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 1]: /images/20220220/cb367612b15a4041a6de3abb1a8f37fc.png
[http_scala-ide.org_download_prev-stable.html]: http://scala-ide.org/download/prev-stable.html
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 2]: /images/20220220/1499ca2e033741b6a031b880e50168b6.png
[http_alchim31.free.fr_m2e-scala_update-site]: http://alchim31.free.fr/m2e-scala/update-site/
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 3]: /images/20220220/809d68b371b946f7a2320de85caa043e.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 4]: /images/20220220/8f5a6021a9be4e4c9fddf0da5e24ff59.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 5]: /images/20220220/a1084e2c0b1348e2b69c2353a34acc12.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly95YW54bWwuYmxvZy5jc2RuLm5ldA_size_16_color_FFFFFF_t_70 6]: /images/20220220/432e9519416d42ecb82ae1d920390cc7.png
[http_scala-ide.org_download_current.html]: http://scala-ide.org/download/current.html
[eclipse_Scala IDE_An internal error occurred during_ _Computing additional info]: https://blog.csdn.net/lzw2016/article/details/86717728
[scala-eclipse-maven]: https://zhuanlan.zhihu.com/p/27082614
[eclipse_jdk]: https://blog.csdn.net/shuoshuo_12345/article/details/82688878
[eclipse]: https://blog.csdn.net/u010919133/article/details/70240745
[spark_Scala IDEA for Eclipse_IntelliJ IDEA_spark2.2.0]: https://www.cnblogs.com/zlslch/p/7457352.html
[attaching-sources-in-intellij-idea-for-scala-project]: https://stackoverflow.com/questions/13520532/attaching-sources-in-intellij-idea-for-scala-project
[intellij idea_scala sdk]: https://blog.csdn.net/weixin_34122810/article/details/86941742
[Eclipse 1]: https://www.cnblogs.com/JealousGirl/p/setup_Decompiler.html
[MyEclipse_android _jar_ The JAR of this class file belongs to container _Android Private Libraries_ which does not allow modifications to source attachments on its entries.]: https://www.cnblogs.com/mengjinluohua/p/7607600.html
[running-spark-on-eclipse-in-linux]: https://stackoverflow.com/questions/48623524/running-spark-on-eclipse-in-linux
[importing-spark-source-code-to-eclipse-ide]: https://stackoverflow.com/questions/36054323/importing-spark-source-code-to-eclipse-ide
[Eclipse_Spark_Spark]: https://segmentfault.com/q/1010000009133455
[eclipse_scala]: https://blog.csdn.net/xugen12/article/details/75181204
[Eclipse 2]: https://blog.csdn.net/qq_33929120/article/details/82747720
[scala ide for eclipse_spark]: https://ask.csdn.net/questions/663118
[Eclipse_Maven_Source]: https://blog.csdn.net/guoquanyou/article/details/78612137
[eclipse_scala 1]: https://blog.csdn.net/lzxlfly/article/details/80728772
[eclipse_Scala]: https://cloud.tencent.com/developer/ask/105127
[eclipse_scala 2]: https://blog.csdn.net/zh_s_z/article/details/81316487
[Eclipse_IDEA_Scala_Spark]: https://www.cnblogs.com/simplestupid/p/4687507.html
[maven_3_ - scala_scala-maven-plugin]: https://www.jianshu.com/p/461671002589
[Scala_Eclipse_Scala]: https://blog.csdn.net/l1028386804/article/details/80864786
[There is _Run Configuration_ but no _Run As Scala Application_ in Eclipse]: https://stackoverflow.com/questions/15974317/there-is-run-configuration-but-no-run-as-scala-application-in-eclipse
[Computing additional info_.Could not initialize class]: https://blog.csdn.net/dafeige8/article/details/75570733