Antonin Delpeuch created MJAVADOC-739:
-----------------------------------------

             Summary: Null pointer exception when executing javadoc:fix goal
                 Key: MJAVADOC-739
                 URL: https://issues.apache.org/jira/browse/MJAVADOC-739
             Project: Maven Javadoc Plugin
          Issue Type: Bug
          Components: fix
    Affects Versions: 3.4.1
            Reporter: Antonin Delpeuch


Running `mvn -e javadoc:fix` on my project, I get the following error:

```

[ERROR] Failed to execute goal 
org.apache.maven.plugins:maven-javadoc-plugin:3.4.1:fix (default-cli) on 
project refine-model: Execution default-cli of goal 
org.apache.maven.plugins:maven-javadoc-plugin:3.4.1:fix failed.: 
NullPointerException -> [Help 1]
org.apache.maven.lifecycle.LifecycleExecutionException: Failed to execute goal 
org.apache.maven.plugins:maven-javadoc-plugin:3.4.1:fix (default-cli) on 
project refine-model: Execution default-cli of goal 
org.apache.maven.plugins:maven-javadoc-plugin:3.4.1:fix failed.
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:215)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
(LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
(LifecycleModuleBuilder.java:81)
    at 
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
 (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:957)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:289)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:193)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke 
(NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke 
(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
(Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
(Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
(Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main 
(Launcher.java:347)
Caused by: org.apache.maven.plugin.PluginExecutionException: Execution 
default-cli of goal org.apache.maven.plugins:maven-javadoc-plugin:3.4.1:fix 
failed.
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo 
(DefaultBuildPluginManager.java:148)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
(LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
(LifecycleModuleBuilder.java:81)
    at 
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
 (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:957)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:289)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:193)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke 
(NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke 
(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
(Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
(Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
(Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main 
(Launcher.java:347)
Caused by: java.lang.NullPointerException
    at org.apache.maven.plugins.javadoc.AbstractFixJavadocMojo.writeParamTag 
(AbstractFixJavadocMojo.java:2101)
    at 
org.apache.maven.plugins.javadoc.AbstractFixJavadocMojo.updateJavadocTags 
(AbstractFixJavadocMojo.java:1993)
    at 
org.apache.maven.plugins.javadoc.AbstractFixJavadocMojo.updateJavadocTags 
(AbstractFixJavadocMojo.java:1905)
    at 
org.apache.maven.plugins.javadoc.AbstractFixJavadocMojo.updateJavadocComment 
(AbstractFixJavadocMojo.java:1740)
    at 
org.apache.maven.plugins.javadoc.AbstractFixJavadocMojo.updateEntityComment 
(AbstractFixJavadocMojo.java:1612)
    at org.apache.maven.plugins.javadoc.AbstractFixJavadocMojo.fixMethodComment 
(AbstractFixJavadocMojo.java:1466)
    at org.apache.maven.plugins.javadoc.AbstractFixJavadocMojo.processFix 
(AbstractFixJavadocMojo.java:1083)
    at org.apache.maven.plugins.javadoc.AbstractFixJavadocMojo.execute 
(AbstractFixJavadocMojo.java:475)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo 
(DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:210)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:156)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute 
(MojoExecutor.java:148)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
(LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject 
(LifecycleModuleBuilder.java:81)
    at 
org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build
 (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute 
(LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:957)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:289)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:193)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke 
(NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke 
(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:566)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced 
(Launcher.java:282)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch 
(Launcher.java:225)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode 
(Launcher.java:406)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main 
(Launcher.java:347)

```

 

To reproduce this, run `mvn -e javadoc:fix` on the commit 
`9bb34347036ff7e911cdf6b3c1281f276ac5dc80` of the git repository 
`https://github.com/OpenRefine/OpenRefine`.

I am using Java 17 on Debian but I expect the issue should be reproducible in 
other environments as well.



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