How to resolve "cannot find symbol" compiler errors on NbBundle constants after upgrading to JDK 23+

[mbien]

Message Bundle fields defined using org.openide.util.NbBundle.Messages annotations rely on the annotation processor to generate boilerplate code.

    @Messages(
        "HELLO_text=Hello There!"
    )
    public void hello() {
        System.out.println(Bundle.HELLO_text());
    }

JDK 23 and later will no longer automatically run annotation processors found in the classpath (see https://inside.java/2024/06/18/quality-heads-up/).

Resolution

add -proc:full to your compiler options, e.g for maven:

    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.14.0</version>
        <configuration>
            <compilerArgs>
                <arg>-proc:full</arg>
            </compilerArgs>
        </configuration>
    </plugin>

or:

    <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.14.0</version>
        <configuration>
            <proc>full</proc>
        </configuration>
    </plugin>