Build path issue : Unexpected "Incompatible .class files version in required binaries"

[sbernard31]

Hi,

I face a strange behavior when I try to build my Maven project with Eclipse, I get this error in Problems view :

Incompatible .class files version in required binaries. Project 'leshan-integration-tests' is targeting a 1.8 runtime, but is compiled against 'home/sbernard/.m2/repository/org/junit/jupiter/junit-jupiter-engine/5.10.1/junit-jupiter-engine-5.10.1.jar' (from the container 'Maven Dependencies') which requires a 9 runtime

but Junit5 should works with java 8 : https://junit.org/junit5/docs/current/user-guide/#overview-java-versions

When I build with maven I have not issue.

If I delete all this Error in eclipse and try to rebuild it works but sometime the error comeback which break the automatic build then I need to delete the error again .... 😬

Any idea why I face this behavior ?

I try to look at junit-jupiter-engine-5.10.1 pom an see nothing special about java 9 ...

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
  <!-- This module was also published with a richer model, Gradle metadata,  -->
  <!-- which should be used instead. Do not delete the following line which  -->
  <!-- is to indicate to Gradle or any Gradle module metadata file consumer  -->
  <!-- that they should prefer consuming it instead. -->
  <!-- do_not_remove: published-with-gradle-metadata -->
  <modelVersion>4.0.0</modelVersion>
  <groupId>org.junit.jupiter</groupId>
  <artifactId>junit-jupiter-engine</artifactId>
  <version>5.10.1</version>
  <name>JUnit Jupiter Engine</name>
  <description>Module "junit-jupiter-engine" of JUnit 5.</description>
  <url>https://junit.org/junit5/</url>
  <licenses>
    <license>
      <name>Eclipse Public License v2.0</name>
      <url>https://www.eclipse.org/legal/epl-v20.html</url>
    </license>
  </licenses>
  <developers>
    <developer>
      <id>bechte</id>
      <name>Stefan Bechtold</name>
      <email>stefan.bechtold@me.com</email>
    </developer>
    <developer>
      <id>jlink</id>
      <name>Johannes Link</name>
      <email>business@johanneslink.net</email>
    </developer>
    <developer>
      <id>marcphilipp</id>
      <name>Marc Philipp</name>
      <email>mail@marcphilipp.de</email>
    </developer>
    <developer>
      <id>mmerdes</id>
      <name>Matthias Merdes</name>
      <email>matthias.merdes@heidelpay.com</email>
    </developer>
    <developer>
      <id>sbrannen</id>
      <name>Sam Brannen</name>
      <email>sam@sambrannen.com</email>
    </developer>
    <developer>
      <id>sormuras</id>
      <name>Christian Stein</name>
      <email>sormuras@gmail.com</email>
    </developer>
    <developer>
      <id>juliette-derancourt</id>
      <name>Juliette de Rancourt</name>
      <email>derancourt.juliette@gmail.com</email>
    </developer>
  </developers>
  <scm>
    <connection>scm:git:git://github.com/junit-team/junit5.git</connection>
    <developerConnection>scm:git:git://github.com/junit-team/junit5.git</developerConnection>
    <url>https://github.com/junit-team/junit5</url>
  </scm>
  <dependencyManagement>
    <dependencies>
      <dependency>
        <groupId>org.junit</groupId>
        <artifactId>junit-bom</artifactId>
        <version>5.10.1</version>
        <type>pom</type>
        <scope>import</scope>
      </dependency>
    </dependencies>
  </dependencyManagement>
  <dependencies>
    <dependency>
      <groupId>org.junit.platform</groupId>
      <artifactId>junit-platform-engine</artifactId>
      <version>1.10.1</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.junit.jupiter</groupId>
      <artifactId>junit-jupiter-api</artifactId>
      <version>5.10.1</version>
      <scope>compile</scope>
    </dependency>
    <dependency>
      <groupId>org.apiguardian</groupId>
      <artifactId>apiguardian-api</artifactId>
      <version>1.1.2</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>
</project>

Version used :

M2E - Maven Integration for Eclipse 2.4.200.20231002-0712 org.eclipse.m2e.feature.feature.group Eclipse.org - m2e
M2E - POM Editor using LemMinX language server (includes Incubating components) 2.0.5.20230815-1219 org.eclipse.m2e.lemminx.feature.feature.group Eclipse.org - m2e
M2E - SLF4J over Logback Logging 2.2.0.20230819-1220 org.eclipse.m2e.logback.feature.feature.group Eclipse.org - m2e

Eclipse IDE for Java Developers (includes Incubating components)
Version: 2023-09 (4.29.0)
Build id: 20230907-1323

Linux 6.1.0-23-amd64 Debian 6.1.99-1 (2024-07-15) x86_64 GNU/Linux

[ivenhov]

Just wanted to mentioned I stumbled upon something like this with bytebuddy v 1.12.10 or newer with Java project set up to use Java 8.
Problem disappears when project's Setting->Java Compiler->Building->Incompatible required binaries is changed from Error to Warning
See details here
raphw/byte-buddy#1688

Is there a module-info.class inspection happening on projects with Java 8 ?

Also related
junit-team/junit5#3619