Java Community | Help. Code. Learn.•2w ago

An exception occurred while executing the Java class. Unsupported major.minor version 68.0

I am testing graalvm espresso.

$ java --version
Espresso 64-Bit VM Oracle GraalVM 21.0.2+13.1 (build 21-espresso-24.2.0, mixed mode)

$ java --version
Espresso 64-Bit VM Oracle GraalVM 21.0.2+13.1 (build 21-espresso-24.2.0, mixed mode)

I created a vanilla java program, which can be compiled and ran without a problem. However, when attempting to manage the project using maven (v.3.9.11), mvn throws An exception occurred while executing the Java class. Unsupported major.minor version 68.0. I know its version mismatched error. So I add related fields with version 24 such as maven.compiler.source, maven.compiler.target, source, target to pom.xml as below. But the problem remains. What's the correct fields or version value to specify for pinning the jdk source and target version? Or anything that I also need to configure or miss? Thanks.

<?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/maven-v4_0_0.xsd">
   ...
     <properties>
        <java.version>24</java.version>
        <maven.compiler.source>24</maven.compiler.source>
        <maven.compiler.target>24</maven.compiler.target>
     </properties>

      <dependencies>
        <dependency>
            <groupId>org.graalvm.espresso</groupId>
            <artifactId>continuations</artifactId>
            <version>24.2.0</version>
        </dependency>
      </dependencies>
       
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.14.0</version>
                <configuration>
                    <source>24</source>
                    <target>24</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

<?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/maven-v4_0_0.xsd">
   ...
     <properties>
        <java.version>24</java.version>
        <maven.compiler.source>24</maven.compiler.source>
        <maven.compiler.target>24</maven.compiler.target>
     </properties>

      <dependencies>
        <dependency>
            <groupId>org.graalvm.espresso</groupId>
            <artifactId>continuations</artifactId>
            <version>24.2.0</version>
        </dependency>
      </dependencies>
       
    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.14.0</version>
                <configuration>
                    <source>24</source>
                    <target>24</target>
                </configuration>
            </plugin>
        </plugins>
    </build>
</project>

11 Replies

JavaBot•2w ago

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Madjosz•2w ago

The versioning scheme more looks like the latest supported JDK version of your GraalVM runtime is 21. Yep, that's it. While GraalVM website says it would be "GraalVM for JDK 24 (Latest)" when I try to run a file compiled with JDK 22 I get a LinkageError with UnsupportedClassVersionError.

dan1st•2w ago

Their runtime is espresso and not GraalVM directly espresso is a different JVM but idk whether espresso for JDK 24 is supposed to be supported with GraalVM for JDK 21 I think that's because you are compiling it with JDK 21 (GraalVM) and you would only use espresso for running your application but not compiling (idk whether that's supported). Nothing in your pom.xml specifies that you are actually using espresso for anything other than a dependency basically but yes, trying to use GraalVM for JDK 24 is probably still a good idea

Madjosz•2w ago

I downloaded from here so I tested with Espresso 24: https://www.graalvm.org/latest/reference-manual/espresso/

Espresso …

GraalVM is an advanced JDK with ahead-of-time Native Image compilation.

dan1st•2w ago

So? this is espresso for JDK 24 I think even though espresso itself is running on JDK 21 but yes I generally wouldn't run espresso for applications using a Java version not designated as LTS by Oracle

Madjosz•2w ago

For me it even explicitly prints

$ espresso24 -version
java version "21.0.2" 2024-01-16 LTS
Java(TM) SE Runtime Environment Oracle GraalVM 21.0.2+13.1 (build 21.0.2+13-LTS-jvmci-23.1-b33)
Espresso 64-Bit VM Oracle GraalVM 21.0.2+13.1 (build 21-espresso-24.2.0, mixed mode)

$ espresso24 -version
java version "21.0.2" 2024-01-16 LTS
Java(TM) SE Runtime Environment Oracle GraalVM 21.0.2+13.1 (build 21.0.2+13-LTS-jvmci-23.1-b33)
Espresso 64-Bit VM Oracle GraalVM 21.0.2+13.1 (build 21-espresso-24.2.0, mixed mode)

So idk where the 24 comes into play actually.

dan1st•2w ago

seems like that one espresso version is espresso for JDK 24 but actually running on JDK 24

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everymenOP•2w ago

Thanks for the input. I will try if there exists v24 version, not v21. Thanks again for the advice!

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An exception occurred while executing the Java class. Unsupported major.minor version 68.0

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