This might be a bug, when generating openapi file, the plugin is trying to initialize log4j file which is to be included in the war but in anyway should not be used by the plugin.
I've tried with v2.2.9, v2.1.0 and v2.1.13, same error was thrown.
Here is the error trace :
ERROR StatusConsoleListener Unable to create file /xxx/xx/xxxxxx.errors.log
java.io.IOException: Could not create directory /xxx/xx
at org.apache.logging.log4j.core.util.FileUtils.mkdir(FileUtils.java:128)
at org.apache.logging.log4j.core.util.FileUtils.makeParentDirs(FileUtils.java:141)
at org.apache.logging.log4j.core.appender.rolling.RollingFileManager$RollingFileManagerFactory.createManager(RollingFileManager.java:734)
at org.apache.logging.log4j.core.appender.rolling.RollingFileManager$RollingFileManagerFactory.createManager(RollingFileManager.java:718)
at org.apache.logging.log4j.core.appender.AbstractManager.getManager(AbstractManager.java:144)
at org.apache.logging.log4j.core.appender.OutputStreamManager.getManager(OutputStreamManager.java:100)
at org.apache.logging.log4j.core.appender.rolling.RollingFileManager.getFileManager(RollingFileManager.java:217)
at org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:135)
at org.apache.logging.log4j.core.appender.RollingFileAppender$Builder.build(RollingFileAppender.java:62)
at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:124)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:1138)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1063)
at org.apache.logging.log4j.core.config.AbstractConfiguration.createConfiguration(AbstractConfiguration.java:1055)
at org.apache.logging.log4j.core.config.AbstractConfiguration.doConfigure(AbstractConfiguration.java:664)
at org.apache.logging.log4j.core.config.AbstractConfiguration.initialize(AbstractConfiguration.java:258)
at org.apache.logging.log4j.core.config.AbstractConfiguration.start(AbstractConfiguration.java:304)
at org.apache.logging.log4j.core.LoggerContext.setConfiguration(LoggerContext.java:621)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:694)
at org.apache.logging.log4j.core.LoggerContext.reconfigure(LoggerContext.java:711)
at org.apache.logging.log4j.core.LoggerContext.start(LoggerContext.java:253)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:155)
at org.apache.logging.log4j.core.impl.Log4jContextFactory.getContext(Log4jContextFactory.java:47)
at org.apache.logging.log4j.LogManager.getContext(LogManager.java:196)
at org.apache.commons.logging.LogAdapter$Log4jLog.(LogAdapter.java:155)
at org.apache.commons.logging.LogAdapter$Log4jAdapter.createLog(LogAdapter.java:122)
at org.apache.commons.logging.LogAdapter.createLog(LogAdapter.java:89)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:67)
at org.apache.commons.logging.LogFactory.getLog(LogFactory.java:59)
at org.springframework.web.context.support.SpringBeanAutowiringSupport.(SpringBeanAutowiringSupport.java:58)
at java.base/java.lang.Class.forName0(Native Method)
at java.base/java.lang.Class.forName(Class.java:315)
at io.swagger.v3.jaxrs2.integration.JaxrsAnnotationScanner.classes(JaxrsAnnotationScanner.java:69)
at io.swagger.v3.jaxrs2.integration.JaxrsApplicationAndAnnotationScanner.classes(JaxrsApplicationAndAnnotationScanner.java:10)
at io.swagger.v3.oas.integration.GenericOpenApiContext.read(GenericOpenApiContext.java:470)
at io.swagger.v3.plugin.maven.SwaggerMojo.execute(SwaggerMojo.java:83)
at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo(DefaultBuildPluginManager.java:134)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:207)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:153)
at org.apache.maven.lifecycle.internal.MojoExecutor.execute(MojoExecutor.java:145)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:116)
at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject(LifecycleModuleBuilder.java:80)
at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build(SingleThreadedBuilder.java:51)
at org.apache.maven.lifecycle.internal.LifecycleStarter.execute(LifecycleStarter.java:128)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:307)
at org.apache.maven.DefaultMaven.doExecute(DefaultMaven.java:193)
at org.apache.maven.DefaultMaven.execute(DefaultMaven.java:106)
at org.jvnet.hudson.maven3.launcher.Maven33Launcher.main(Maven33Launcher.java:125)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at org.codehaus.plexus.classworlds.launcher.Launcher.launchStandard(Launcher.java:330)
at org.codehaus.plexus.classworlds.launcher.Launcher.launch(Launcher.java:238)
at jenkins.maven3.agent.Maven33Main.launch(Maven33Main.java:179)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.base/java.lang.reflect.Method.invoke(Method.java:566)
at hudson.maven.Maven3Builder.call(Maven3Builder.java:139)
at hudson.maven.Maven3Builder.call(Maven3Builder.java:70)
at hudson.remoting.UserRequest.perform(UserRequest.java:211)
at hudson.remoting.UserRequest.perform(UserRequest.java:54)
at hudson.remoting.Request$2.run(Request.java:377)
at hudson.remoting.InterceptingExecutorService.lambda$wrap$0(InterceptingExecutorService.java:78)
at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
at java.base/java.lang.Thread.run(Thread.java:829)