Javadoc error on @RequiredArgsConstructor(onConstructor=@__(@Inject))

Question

I am trying to generate the javadoc using JDK 8 for a bunch of codes using lombok.

I am getting the error below:

error: cannot find symbol
[ERROR] @RequiredArgsConstructor(onConstructor=@__(@Inject))
[ERROR] ^
[ERROR] symbol: class __

Any advice will be much appreciated on how to resolve the error above.

Update: the error is happening using the maven javadoc plugin configured as below:

        <plugin>
            <artifactId>maven-javadoc-plugin</artifactId>
            <version>2.10.3</version>
            <!--
            <configuration>
                <doclet>ch.raffael.doclets.pegdown.PegdownDoclet</doclet>
                <docletArtifact>
                    <groupId>ch.raffael.pegdown-doclet</groupId>
                    <artifactId>pegdown-doclet</artifactId>
                    <version>1.1.1</version>
                </docletArtifact>
                <useStandardDocletOptions>true</useStandardDocletOptions>
            </configuration>
            -->
        </plugin>

This isn't a duplicate, as it happens under Maven. The original ticket is for IntelliJ — nickcodefresh, Feb 22 '16 at 11:18
For somebody who is looking for a solution like me: I found a solution at http://stackoverflow.com/questions/11329965/how-to-ignore-the-java-source-directory-during-maven-compilation — Ian Lim, Feb 25 '16 at 01:47
This Q is totally unrelated to the "duplicate" Q and was incorrectly flagged. — stickfigure, Sep 27 '19 at 21:36

score 8 · Answer 1 · answered Nov 04 '19 at 17:16

I had the same issue, resolved by:

Configuring lombok-maven-plugin to
1. Delombok the classes into target/delombok directory
2. Don't addOutputDirectory to the compiler source paths
Configure maven-javadoc-plugin to look into the target/delombok directory

A good explanation is also at this similar question

Also, bare in mind that onConstructor is an experimental feature and that with jdk8, you should use (onConstructor_ = @Autowired) instead of jdk7-style onConstructor = @__(@Autowired)

Here is my full config:

<plugin>
    <groupId>org.projectlombok</groupId>
    <artifactId>lombok-maven-plugin</artifactId>
    <version>${lombok-maven-plugin-version}</version>
    <executions>
        <execution>
            <phase>generate-sources</phase>
            <goals>
                 <goal>delombok</goal>
            </goals>
            <configuration>
                <addOutputDirectory>false</addOutputDirectory>
                <sourceDirectory>src/main/java</sourceDirectory>
                <outputDirectory>
                     ${project.build.directory}/delombok
                </outputDirectory>
            </configuration>
       </execution>
    </executions>
</plugin>

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-javadoc-plugin</artifactId>
    <version>${maven-javadoc-plugin-version}</version>
    <executions>
        <execution>
            <id>attach-javadocs</id>
            <goals>
                <goal>jar</goal>
            </goals>
        </execution>
    </executions>
    <configuration>
        <sourcepath>target/generated-sources/delombok</sourcepath>
    </configuration>
</plugin>

where did you find that config file ? – Tomas G. Feb 03 '22 at 09:20 — Tomas G., Feb 03 '22 at 09:20

score 4 · Answer 2 · answered Feb 19 '20 at 13:16

Adding here just for future reference as on my case I was trying to build on Intelij and the error was due to compiler annotation processors being disabled.

To enable it, go to Intelij preferences, open "Build, Execution, Deployment" -> "Compiler" -> "Annotation Processors" and make sure "Enable annotation processing" is enabled

Lotes Silva · Answer 3 · 2022-07-21T17:09:54.070

0

If you use intellij Idea go to setting and add Lombok plugin to your intellij idea

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edited Jul 21 '22 at 17:09

answered Jul 21 '22 at 17:08

Lotes Silva

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2

If you have a new question, please ask it by clicking the [Ask Question](https://stackoverflow.com/questions/ask) button. Include a link to this question if it helps provide context. - [From Review](/review/late-answers/32303614) – Guus Jul 25 '22 at 14:40

score 0 · Answer 4 · answered Feb 03 '23 at 12:44

For me the reason for this error (caused by @RequiredArgsConstructor(onConstructor = @__(@Autowired)) to be exact) was a duplicated @Transactional annotation in another class (overlooked after rebasing a branch in Git). Removing the duplicate resolved the issue immediately, maybe this piece of information helps somebody in the future :-)

Javadoc error on @RequiredArgsConstructor(onConstructor=@__(@Inject))

4 Answers4