为什么 Maven Tycho 无法在工具链中找到正确的 JDK，.xml？

Question

我做了一个简单的RCP应用程序来测试Maven的构建。

我的问题是为什么Maven在工具链中找不到JDK的定义，我该如何解决这些问题?

我的RCP插件使用JDK-15，我相信目标平台带来了对JDK-11和JDK-16的依赖。

我运行'mvn clean verify'，除了以下两个警告外，一切似乎都很好:

[INFO] --- tycho-p2-publisher-plugin:2.3.0:publish-osgi-ee (default-publish-osgi-ee) @ info.wallberg.my_system.my_product ---
[WARNING] No system packages found in profile nor toolchain for JavaSE-11, using current JRE system packages.
This can cause faulty dependency resolution, consider adding a definition for a 'jdk' with id=JavaSE-11 in your toolchains.xml
[INFO] Published profile IUs: [config.a.jre.javase 11.0.0, a.jre.javase 11.0.0]
[INFO] Published profile IUs: [config.a.jre.javase 15.0.0, a.jre.javase 15.0.0]
[WARNING] No system packages found in profile nor toolchain for JavaSE-16, using current JRE system packages.
This can cause faulty dependency resolution, consider adding a definition for a 'jdk' with id=JavaSE-16 in your toolchains.xml
[INFO] Published profile IUs: [config.a.jre.javase 16.0.0, a.jre.javase 16.0.0]

我的pom.xml看起来像:

<project>
<modelVersion>4.0.0</modelVersion>
<groupId>info.wallberg.my_system</groupId>
<artifactId>info.wallberg.my_system.root</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>pom</packaging>
<properties>
<tycho.version>2.3.0</tycho.version>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<!-- Skip the deployment here, submodules can override this property -->
<!--maven.deploy.skip>true</maven.deploy.skip -->
</properties>

<build>
<pluginManagement>
<plugins>
<plugin>
<groupId>org.eclipse.tycho</groupId>
<artifactId>tycho-p2-director-plugin</artifactId>
<version>${tycho.version}</version>
</plugin>
</plugins>
</pluginManagement>
<plugins>
<!--Enable the replacement of the SNAPSHOT version based on the last commit -->
<!--<plugin> <groupId>org.eclipse.tycho</groupId> <artifactId>tycho-packaging-plugin</artifactId> 
<version>${tycho.version}</version> <dependencies> <dependency> <groupId>org.eclipse.tycho.extras</groupId> 
<artifactId>tycho-buildtimestamp-jgit</artifactId> <version>${tycho.version}</version> 
</dependency> </dependencies> <configuration> <timestampProvider>jgit</timestampProvider> 
<jgit.ignore>pom.xml</jgit.ignore> <jgit.dirtyWorkingTree>ignore</jgit.dirtyWorkingTree> 
</configuration> </plugin> -->
<!-- Skip the install, since we do not need the artifacts in our local 
mvn repo -->
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-install-plugin</artifactId>
<version>2.5.2</version>
<configuration>
<skip>true</skip>
</configuration>
</plugin>
<plugin>
<groupId>org.eclipse.tycho</groupId>
<artifactId>tycho-maven-plugin</artifactId>
<version>${tycho.version}</version>
<extensions>true</extensions>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-toolchains-plugin</artifactId>
<version>3.0.0</version>
<executions>
<execution>
<goals>
<goal>toolchain</goal>
</goals>
</execution>
</executions>
<configuration>
<toolchains>
<jdk>
<version>11</version>
<vendor>oracle</vendor>
</jdk>
<jdk>
<version>15</version>
<vendor>oracle</vendor>
</jdk>
<jdk>
<version>16.0.2</version>
<vendor>oracle</vendor>
</jdk>
</toolchains>
</configuration>
</plugin>
<plugin>
<groupId>org.eclipse.tycho</groupId>
<artifactId>target-platform-configuration</artifactId>
<version>${tycho.version}</version>
<configuration>
<executionEnvironment>JavaSE-15</executionEnvironment>
<target>
<artifact>
<groupId>info.wallberg.my_system</groupId>
<artifactId>target-platform</artifactId>
<version>0.0.1-SNAPSHOT</version>
</artifact>
</target>
<environments>
<environment>
<os>linux</os>
<ws>gtk</ws>
<arch>x86_64</arch>
</environment>
<environment>
<os>win32</os>
<ws>win32</ws>
<arch>x86_64</arch>
</environment>
<environment>
<os>macosx</os>
<ws>cocoa</ws>
<arch>x86_64</arch>
</environment>
</environments>
</configuration>
</plugin>
<!-- enable source feature generation -->
<!--plugin> <groupId>org.eclipse.tycho.extras</groupId> <artifactId>tycho-source-feature-plugin</artifactId> 
<version>${tycho.version}</version> <executions> <execution> <id>source-feature</id> 
<phase>package</phase> <goals> <goal>source-feature</goal> </goals> </execution> 
</executions> </plugin> <plugin> <groupId>org.eclipse.tycho</groupId> <artifactId>tycho-source-plugin</artifactId> 
<version>${tycho.version}</version> <executions> <execution> <id>plugin-source</id> 
<goals> <goal>plugin-source</goal> </goals> </execution> </executions> </plugin 
<plugin> <groupId>com.github.spotbugs</groupId> <artifactId>spotbugs-maven-plugin</artifactId> 
<version>3.1.3</version> <configuration> <effort>Max</effort> <threshold>Low</threshold> 
<failOnError>false</failOnError> </configuration> </plugin> -->
</plugins>
</build>
<modules>
<module>bundles</module>
<module>features</module>
<module>releng</module>
<module>tests</module>
</modules>
</project>

我的toolchains.xml看起来像:

<?xml version="1.0" encoding="UTF-8"?>
<toolchains>
<!-- JDK toolchains -->
<toolchain>
<type>jdk</type>
<provides>
<version>11</version>
<vendor>oracle</vendor>
</provides>
<configuration>
<jdkHome>C:Program FilesJavajdk-11</jdkHome>
</configuration>
</toolchain>
<toolchain>
<type>jdk</type>
<provides>
<version>15</version>
<vendor>oracle</vendor>
</provides>
<configuration>
<jdkHome>C:Program FilesJavajdk-15</jdkHome>
</configuration>
</toolchain>
<toolchain>
<type>jdk</type>
<provides>
<version>16.0.2</version>
<vendor>oracle</vendor>
</provides>
<configuration>
<jdkHome>C:Program FilesJavajdk-16.0.2</jdkHome>
</configuration>
</toolchain>
</toolchains>

Answer 1

第谷在<provides>列表的<id>部分中查找执行环境。

例如:

<toolchain>
<type>jdk</type>
<provides>
<id>JavaSE-16</id>
</provides>
<configuration>
<jdkHome>/Library/Java/JavaVirtualMachines/jdk-16.0.2.jdk/Contents/Home</jdkHome>
</configuration>
</toolchain>

为JavaSE-16