I can't build project with Java 17

[delor]

I can't build project with Java 17. I'm getting following error:

[ERROR] Failed to execute goal org.codehaus.gmavenplus:gmavenplus-plugin:1.12.1:generateTestStubs (default) on project java-17-gmavenplus-problem: Execution default of goal org.codehaus.gmavenplus:gmavenplus-plugin:1.12.1:generateTestStubs failed: Unrecognized target bytecode: '17'. -> [Help 1]

with this pom

<?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>org.example</groupId>
    <artifactId>java-17-gmavenplus-problem</artifactId>
    <version>1.0-SNAPSHOT</version>

    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
    </properties>

    <build>
        <plugins>
            <plugin>
                <groupId>org.codehaus.gmavenplus</groupId>
                <artifactId>gmavenplus-plugin</artifactId>
                <version>1.12.1</version>
                <executions>
                    <execution>
                        <goals>
                            <goal>addSources</goal>
                            <goal>addTestSources</goal>
                            <goal>generateStubs</goal>
                            <goal>compile</goal>
                            <goal>generateTestStubs</goal>
                            <goal>compileTests</goal>
                            <goal>removeStubs</goal>
                            <goal>removeTestStubs</goal>
                        </goals>
                    </execution>
                </executions>
            </plugin>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <version>3.8.1</version>
            </plugin>
        </plugins>
    </build>
    
    <dependencies>
        <dependency>
            <groupId>org.codehaus.groovy</groupId>
            <artifactId>groovy-all</artifactId>
            <version>3.0.7</version>
            <type>pom</type>
        </dependency>
    </dependencies>
</project>

[chiquitinxx]

I have created this PR, let me know if I can improve

[keeganwitt]

Paul mentioned some caveats to using Java >= 16 with Groovy 3, which I'm linking here for visibility.

#197 (comment)