[英]Maven compiling with different JDK versions
我的應用程序在 Java 1.6u45 和 Java 1.8 上的用戶之間拆分。 我們的問題是我們不能同時指定項目系統庫和代碼有兩個不同的編譯器設置。
項目結構:
Project >
> src/main/java/com/us/javafx/... (Java 8 code)
> src/main/java/com/us/... (Java 6 code)
> src/main/resources/...
我們的 POM.xml:
<?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.us</groupId>
<artifactId>PROJECT</artifactId>
<version>1.0.0</version>
<packaging>jar</packaging>
<name>PROJECT</name>
<description>DESCR</description>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
</properties>
<dependencies>
</dependencies>
<build>
<plugins>
<!-- Copy all dependencies to jars directory -->
<plugin>
<artifactId>maven-dependency-plugin</artifactId>
<executions>
<execution>
<phase>package</phase>
<goals>
<goal>copy-dependencies</goal>
</goals>
<configuration>
<outputDirectory>${project.build.directory}/jars</outputDirectory>
</configuration>
</execution>
</executions>
</plugin>
<!-- Maven Compiler -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-compiler-plugin</artifactId>
<version>3.3</version>
<configuration>
<!-- Necessary to avoid setting JRE on Maven project update! -->
<!-- SEE PHOTO FOR WHY THIS IS HERE -->
<source>1.8</source>
<target>1.8</target>
</configuration>
<executions>
<!-- Compile Java 6 directory -->
<execution>
<id>java6</id>
<configuration>
<excludes>
<exclude>com/us/javafx/**/*</exclude>
</excludes>
<!-- Non working attempt to set compiler version -->
<source>1.6</source>
<target>1.6</target>
</configuration>
</execution>
<!-- Compile Java 8 directory -->
<execution>
<id>java8</id>
<configuration>
<includes>
<include>com/us/javafx/**/*</include>
</includes>
<!-- Non working attempt to set compiler version -->
<source>1.8</source>
<target>1.8</target>
</configuration>
</execution>
</executions>
</plugin>
<!-- Create JAR in jars folder -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-jar-plugin</artifactId>
<version>2.6</version>
<configuration>
<outputDirectory>${project.build.directory}/jars</outputDirectory>
</configuration>
</plugin>
</plugins>
</build>
如果我們告訴 Maven 編譯器插件使用 Java 1.8,Java 1.6 用戶得到不支持的主要版本錯誤。 Or we tell the Maven compiler plugin to use Java 1.6 but our Java 8 code will complain about errors when performing Right Click Project > Maven > Update Project... (which causes the screen shot below):
有沒有一種方法可以同時實現:
1)用各自的編譯器編譯Java 6和8代碼
2)選擇Java 8作為我們項目的JRE系統庫
我最近了解了toolchains.xml。 Maven甚至記錄了該文檔,並從2.0.9開始支持它! 請參閱工具鏈文檔
因此,我向我的〜/ .m2 /文件夾中添加了一個toolchain.xml文件,內容如下:
<toolchains xmlns="http://maven.apache.org/TOOLCHAINS/1.1.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/TOOLCHAINS/1.1.0 http://maven.apache.org/xsd/toolchains-1.1.0.xsd">
<!-- JDK toolchains -->
<toolchain>
<type>jdk</type>
<provides>
<version>1.8</version>
<vendor>sun</vendor>
</provides>
<configuration>
<jdkHome>/opt/java8</jdkHome>
</configuration>
</toolchain>
<toolchain>
<type>jdk</type>
<provides>
<version>1.7</version>
<vendor>sun</vendor>
</provides>
<configuration>
<jdkHome>/opt/java7</jdkHome>
</configuration>
</toolchain>
</toolchains>
它使您可以定義Maven可以使用哪些不同的JDK來構建項目,而與運行JDK的Maven無關。 在IDE中在項目級別定義JDK時,有點像。 當我需要使用Java 7構建另一個項目同時將Java 8作為默認項目時,就使用了它。
我想這可以解決您的問題。
Maven 配置文件是最簡單和最有效的配置文件。 您也可以從 IDE 中選擇和運行它們。 您為所需的每個不同 JDK 設計一個配置文件。 您放入每個不同的 JDK 配置文件:
Project
+properties
+dependencies
+Profiles
Profile JDK8
+jdk8-properties
jdk.version
maven.compiler.source
maven.compiler.target
+jdk8-dependencies
Profile JDK11
+jdk11-properties
jdk.version
maven.compiler.source
maven.compiler.target
+jdk11-dependencies
還有一個例子
<project>
<name>x</name>
<dependencies>
<dependency>
<groupId>com.h2database</groupId>
<artifactId>h2</artifactId>
<version>2.1.210</version>
</dependency>
</dependencies>
<profiles>
<!-- different Java versions -->
<profile>
<id>jdk8</id>
<activation>
<activeByDefault>false</activeByDefault>
</activation>
<properties>
<jdk.version>1.8</jdk.version>
<maven.compiler.source>1.8</maven.compiler.source>
<maven.compiler.target>1.8</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.hibernate</groupId>
<artifactId>hibernate-core-jakarta</artifactId>
<version>5.6.10.Final</version>
</dependency>
<!-- needed if jakarta is used -->
<dependency>
<groupId>javax.enterprise</groupId>
<artifactId>cdi-api</artifactId>
<version>2.0</version>
<scope>provided</scope>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>42.2.25</version>
</dependency>
</dependencies>
</profile>
<profile>
<id>jdk11</id>
<properties>
<jdk.version>11</jdk.version>
<maven.compiler.source>11</maven.compiler.source>
<maven.compiler.target>11</maven.compiler.target>
</properties>
<dependencies>
<dependency>
<groupId>org.hibernate.orm</groupId>
<artifactId>hibernate-core</artifactId>
<version>6.1.2.Final</version>
</dependency>
<dependency>
<groupId>org.postgresql</groupId>
<artifactId>postgresql</artifactId>
<version>42.4.2</version>
</dependency>
</dependencies>
</profile>
</profiles>
<properties>
<failOnMissingWebXml>false</failOnMissingWebXml>
<junit-version>4.13.2</junit-version>
</properties>
</project>
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