NullPointerException for anyOf contains primitive array type

[rudibatt]

With a model that contains a property that uses anyOf to reference primitive array types, the ModelResolver runs into a NPE/NullPointerException.

Truncated Model that causes the issue:

public class Document {
	@Schema(
			anyOf = {
			 	  Boolean[].class,
				  Integer[].class,
				  Long[].class,
				  Double[].class,
				  String[].class,
			})
	public Map<String, Object> data = new HashMap<>();
}

Exception:

[ERROR] Error resolving API specification
java.lang.NullPointerException: Cannot invoke "io.swagger.v3.oas.models.media.Schema.getName()" because "anyOfRef" is null
    at io.swagger.v3.core.jackson.ModelResolver.lambda$resolve$8 (ModelResolver.java:925)
    at java.util.ArrayList.forEach (ArrayList.java:1511)
    at io.swagger.v3.core.jackson.ModelResolver.resolve (ModelResolver.java:923)
    at io.swagger.v3.core.converter.ModelConverterContextImpl.resolve (ModelConverterContextImpl.java:97)
    at io.swagger.v3.core.jackson.ModelResolver.resolve (ModelResolver.java:445)
    at io.swagger.v3.core.converter.ModelConverterContextImpl.resolve (ModelConverterContextImpl.java:97)
    at io.swagger.v3.core.jackson.ModelResolver.resolve (ModelResolver.java:706)
    at io.swagger.v3.core.converter.ModelConverterContextImpl.resolve (ModelConverterContextImpl.java:97)
    at io.swagger.v3.core.jackson.ModelResolver.resolve (ModelResolver.java:477)
    at io.swagger.v3.core.converter.ModelConverterContextImpl.resolve (ModelConverterContextImpl.java:97)
    at io.swagger.v3.core.jackson.ModelResolver.resolve (ModelResolver.java:706)
    at io.swagger.v3.core.converter.ModelConverterContextImpl.resolve (ModelConverterContextImpl.java:97)
    at io.swagger.v3.core.converter.ModelConverters.resolveAsResolvedSchema (ModelConverters.java:153)
    at io.swagger.v3.core.util.ParameterProcessor.applyAnnotations (ParameterProcessor.java:69)
    at io.swagger.v3.jaxrs2.DefaultParameterExtension.extractParameters (DefaultParameterExtension.java:117)
    at io.swagger.v3.jaxrs2.Reader.getParameters (Reader.java:1520)
    at io.swagger.v3.jaxrs2.Reader.read (Reader.java:567)
    at io.swagger.v3.jaxrs2.Reader.read (Reader.java:196)
    at io.swagger.v3.jaxrs2.Reader.read (Reader.java:224)
    at io.swagger.v3.oas.integration.GenericOpenApiContext.read (GenericOpenApiContext.java:642)
    at io.swagger.v3.plugin.maven.SwaggerMojo.execute (SwaggerMojo.java:84)
    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.DirectMethodHandleAccessor.invoke (DirectMethodHandleAccessor.java:104)
    at java.lang.reflect.Method.invoke (Method.java:577)
    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)

[frantuma]

fixed by #4640