Internal error in the mapping processor: java.lang.NullPointerException: Cannot invoke "javax.lang.model.element.TypeElement.getEnclosedElements()" because "this.typeElement" is null
at org.mapstruct.ap.internal.model.common.Type.hasAccessibleConstructor(Type.java:1341)
at org.mapstruct.ap.internal.model.BeanMappingMethod$Builder.canReturnTypeBeConstructed(BeanMappingMethod.java:771)
at org.mapstruct.ap.internal.model.BeanMappingMethod$Builder.doesNotAllowAbstractReturnTypeAndCanBeConstructed(BeanMappingMethod.java:485)
at org.mapstruct.ap.internal.model.BeanMappingMethod$Builder.build(BeanMappingMethod.java:211)
at org.mapstruct.ap.internal.processor.MapperCreationProcessor.getMappingMethods(MapperCreationProcessor.java:427)
at org.mapstruct.ap.internal.processor.MapperCreationProcessor.getMapper(MapperCreationProcessor.java:188)
at org.mapstruct.ap.internal.processor.MapperCreationProcessor.process(MapperCreationProcessor.java:142)
at org.mapstruct.ap.internal.processor.MapperCreationProcessor.process(MapperCreationProcessor.java:85)
at org.mapstruct.ap.MappingProcessor.process(MappingProcessor.java:400)
at org.mapstruct.ap.MappingProcessor.processMapperTypeElement(MappingProcessor.java:380)
at org.mapstruct.ap.MappingProcessor.processMapperElements(MappingProcessor.java:329)
at org.mapstruct.ap.MappingProcessor.process(MappingProcessor.java:213)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.callProcessor(JavacProcessingEnvironment.java:1023)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.discoverAndRunProcs(JavacProcessingEnvironment.java:939)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment$Round.run(JavacProcessingEnvironment.java:1267)
at jdk.compiler/com.sun.tools.javac.processing.JavacProcessingEnvironment.doProcessing(JavacProcessingEnvironment.java:1382)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.processAnnotations(JavaCompiler.java:1234)
at jdk.compiler/com.sun.tools.javac.main.JavaCompiler.compile(JavaCompiler.java:916)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.lambda$doCall$0(JavacTaskImpl.java:104)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.invocationHelper(JavacTaskImpl.java:152)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.doCall(JavacTaskImpl.java:100)
at jdk.compiler/com.sun.tools.javac.api.JavacTaskImpl.call(JavacTaskImpl.java:94)
at org.codehaus.plexus.compiler.javac.JavaxToolsCompiler.compileInProcess(JavaxToolsCompiler.java:126)
at org.codehaus.plexus.compiler.javac.JavacCompiler.performCompile(JavacCompiler.java:174)
at org.apache.maven.plugin.compiler.AbstractCompilerMojo.execute(AbstractCompilerMojo.java:1134)
at org.apache.maven.plugin.compiler.CompilerMojo.execute(CompilerMojo.java:187)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:126)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute2(MojoExecutor.java:328)
at org.apache.maven.lifecycle.internal.MojoExecutor.doExecute(MojoExecutor.java:316)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:212)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:174)
at org.apache.maven.lifecycle.internal.MojoExecutor.access$000(MojoExecutor.java:75)
at org.apache.maven.lifecycle.internal.MojoExecutor$1.run(MojoExecutor.java:162)
at org.apache.maven.plugin.DefaultMojosExecutionStrategy.execute(DefaultMojosExecutionStrategy.java:39)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:159)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:105)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:73)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:53)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:118)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:261)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:173)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:101)
at org.apache.maven.cli.MavenCli.execute(MavenCli.java:906)
at org.apache.maven.cli.MavenCli.doMain(MavenCli.java:283)
at org.apache.maven.cli.MavenCli.main(MavenCli.java:206)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:77)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:569)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced(Launcher.java:283)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:226)
at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode(Launcher.java:407)
at org.codehaus.plexus.classworlds.launcher.Launcher.main(Launcher.java:348)

@Mapper
public interface TestMapper {
    byte[] map(String something);
}