Java web-app cannot compile with JDK 24: java: java.lang.ExceptionInInitializerError , com.sun.tools.javac.code.TypeTag :: UNKNOWN

Question

I have file maven.pom

<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
</dependency>

I use many JDKs (Adoptium, Amazon Correcto) but did not success. Error

java: java.lang.ExceptionInInitializerError
com.sun.tools.javac.code.TypeTag :: UNKNOWN

How to fix it?

Answer 1

Lombok 1.18.38 is the the supported version for JVM 24.

Please modifiy your pom.xml as;

    <properties>
        <java.version>24</java.version>
        <lombok.version>1.18.38</lombok.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <version>${lombok.version}</version>
            <scope>provided</scope>
        </dependency>
    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.apache.maven.plugins</groupId>
                <artifactId>maven-compiler-plugin</artifactId>
                <configuration>
                    <annotationProcessorPaths>
                        <path>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                            <version>${lombok.version}</version>
                        </path>
                    </annotationProcessorPaths>
                </configuration>
            </plugin> 
        </plugins>
    </build>

PS: Plugin part is to overcome following error;

java.lang.ExceptionInInitializerError: com.sun.tools.javac.code.TypeTag :: UNKNOWN`

Reference: https://github.com/projectlombok/lombok/issues/3772#issuecomment-2783304578

Answer 2

I researched many days. Because Lombok did not support, even latest version of Lombok at the time of writing is

<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok</artifactId>
    <version>1.18.36</version>
    <scope>provided</scope>
</dependency>

(did not work)

. Please wait next release. See https://github.com/projectlombok/lombok/tags

https://github.com/projectlombok/lombok/pull/3840 (Please keep this question and answer, it will help many others who looking for solution, exactly looking for reason why error happens).

More information: Even use JDK 24, and set Java language level is 23, it will still cause error, must use JDK 23 with Java language level 23 with latest version of Lombok (at the time of writing).