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JDK discovery mechanism now working as expected #62
Description
Affected version
3.2.0
Bug description
Executing mvn org.apache.maven.plugins:maven-toolchains-plugin:3.2.0:display-discovered-jdk-toolchains works, and returns all JDKs installed on my machine, but I don't know how to cinfigure Maven to use Java 8 for project runtime.
This auto discovery mechanism should work without ~/.m2/toolchains.xml file per documentation.
My goal is to run project with Java 8.
My 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 https://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.7.18</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.username.mock</groupId>
<artifactId>webserver</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>webserver</name>
<description>Demo project for Spring Boot</description>
<url/>
<licenses>
<license/>
</licenses>
<developers>
<developer/>
</developers>
<scm>
<connection/>
<developerConnection/>
<tag/>
<url/>
</scm>
<properties>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
<plugin>
<groupId>org.apache.maven.plugins</groupId>
<artifactId>maven-toolchains-plugin</artifactId>
<version>3.2.0</version>
<executions>
<execution>
<goals>
<goal>select-jdk-toolchain</goal>
</goals>
<configuration>
<discoverToolchains>true</discoverToolchains>
<runtimeVersion>8</runtimeVersion>
</configuration>
</execution>
</executions>
</plugin>
</plugins>
</build>
</project>Error I get with mvn spring-boot:run:
[INFO] Found 5 possible jdks: [/usr/lib/jvm/java-21-openjdk, /usr/lib/jvm/java-11-openjdk, /usr/lib/jvm/java-24-openjdk, /usr/lib/jvm/java-17-openjdk, /usr/lib/jvm/java-8-openjdk]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 0.884 s
[INFO] Finished at: 2025-06-18T13:41:51+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-toolchains-plugin:3.2.0:select-jdk-toolchain (default) on project webserver: Cannot find matching toolchain definitions for the following toolchain types:{runtime.version=8}
[ERROR] Define the required toolchains in your ~/.m2/toolchains.xml file.
[ERROR] -> [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/MojoFailureException
Activity
jafarre-bi commentedon Jul 2, 2025
I don't think the runtime version is what you really want.
I suggest replacing the
<runtimeVersion/>config parameter with<version>[8,9)</version>, or simply defining the property<toolchain.jdk.version>[8,9)</toolchain.jdk.version>and removing the entire config section.