Trying to generate Java Docs with Maven and it returns the following error:
org.apache.maven.reporting.MavenReportException: Exit code: 1 - javadoc: error - The code being documented uses modules but the packages defined in https://docs.oracle.com/en/java/javase/14/docs/api/ are in the unnamed module. Command line was: "C:\Program Files\Java\jdk-14\bin\javadoc.exe" @options @argfile Refer to the generated Javadoc files in 'C:\projects\HelloWorldApplication\target\apidocs' dir. at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.executeJavadocCommandLine (AbstractJavadocMojo.java:5763) at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.executeReport (AbstractJavadocMojo.java:2152) at org.apache.maven.plugins.javadoc.JavadocJar.doExecute (JavadocJar.java:189) at org.apache.maven.plugins.javadoc.AbstractJavadocMojo.execute (AbstractJavadocMojo.java:1911) 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:564) 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)
Solution:
Add the configuration <javadocExecutable></javadocExecutable> in JavaDoc plugin.
<plugin> <groupId>org.apache.maven.plugins</groupId> <artifactId>maven-javadoc-plugin</artifactId> <version>3.1.1</version> <executions> <execution> <goals> <goal>jar</goal> </goals> <phase>install</phase> <configuration> <failOnError>false</failOnError> <doclint>none</doclint> <javadocExecutable>C:\Program Files\Java\jdk1.8.0\bin\javadoc.exe</javadocExecutable> </configuration> </execution> </executions> </plugin>
Run the maven command to generate the Java Docs: mvn install