感谢@gisphm 提供的解决办法：
参考
https://bugs.openjdk.java.net/browse/JDK-8285445
https://issues.redhat.com/browse/XNIO-404
https://issues.redhat.com/browse/UNDERTOW-2073
把 undertow的依赖 xnio-api 和 xnio-nio 的版本升级到 3.8.7.Final 就行了。
<dependency>
<groupId>org.jboss.xnio</groupId>
<artifactId>xnio-api</artifactId>
<version> 3.8.7.Final</version>
<exclusions>
<exclusion>
<groupId>org.jboss.threads</groupId>
<artifactId>jboss-threads</artifactId>
</exclusion>
</exclusions>
</dependency>
<dependency>
<groupId>org.jboss.xnio</groupId>
<artifactId>xnio-nio</artifactId>
<version> 3.8.7.Final</version>
<exclusions>
<exclusion>
<groupId>org.wildfly.common</groupId>
<artifactId>wildfly-common</artifactId>
</exclusion>
</exclusions>
</dependency>
此外需要将jfinal-undertow升级到3.0
问题描述：
使用的是 jfinal-club-4.9.15
jfinal4.9.x~5.x 均会出现
jdk退回到1.8.0.322就正常了
我常用的是aws 发行的corretto，后来测了eclipse 发行的temurin 同样会出现该错误
https://corretto.aws/downloads/latest/amazon-corretto-8-x64-windows-jdk.zip
2022-05-13 12:59:41
[ERROR]-[Thread: XNIO-1 task-1]-[io.undertow.servlet.api.LoggingExceptionHandler.handleThrowable()]: UT005023: Exception handling request to /
java.io.IOError: java.io.FileNotFoundException: Invalid file path
at org.xnio.channels.Channels$4.run(Channels.java:1103)
at org.xnio.channels.Channels$4.run(Channels.java:1093)
at java.security.AccessController.doPrivileged(Native Method)
at org.xnio.channels.Channels.<clinit>(Channels.java:1093)
at io.undertow.servlet.spec.ServletOutputStreamImpl.flushInternal(ServletOutputStreamImpl.java:504)
at io.undertow.servlet.spec.ServletOutputStreamImpl.flush(ServletOutputStreamImpl.java:478)
at com.jfinal.render.TemplateRender.render(TemplateRender.java:63)
at com.jfinal.core.ActionHandler.handle(ActionHandler.java:113)
at com.jfinal.club.common.handler.UrlSeoHandler.handle(UrlSeoHandler.java:78)
at com.jfinal.plugin.druid.DruidStatViewHandler.handle(DruidStatViewHandler.java:81)
at com.jfinal.core.JFinalFilter.doFilter(JFinalFilter.java:90)
at io.undertow.servlet.core.ManagedFilter.doFilter(ManagedFilter.java:61)
at io.undertow.servlet.handlers.FilterHandler$FilterChainImpl.doFilter(FilterHandler.java:131)
at io.undertow.servlet.handlers.FilterHandler.handleRequest(FilterHandler.java:84)
at io.undertow.servlet.handlers.security.ServletSecurityRoleHandler.handleRequest(ServletSecurityRoleHandler.java:62)
at io.undertow.servlet.handlers.ServletChain$1.handleRequest(ServletChain.java:68)
at io.undertow.servlet.handlers.ServletDispatchingHandler.handleRequest(ServletDispatchingHandler.java:36)
at io.undertow.servlet.handlers.RedirectDirHandler.handleRequest(RedirectDirHandler.java:68)
at io.undertow.servlet.handlers.security.SSLInformationAssociationHandler.handleRequest(SSLInformationAssociationHandler.java:117)
at io.undertow.servlet.handlers.security.ServletAuthenticationCallHandler.handleRequest(ServletAuthenticationCallHandler.java:57)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.security.handlers.AbstractConfidentialityHandler.handleRequest(AbstractConfidentialityHandler.java:46)
at io.undertow.servlet.handlers.security.ServletConfidentialityConstraintHandler.handleRequest(ServletConfidentialityConstraintHandler.java:64)
at io.undertow.security.handlers.AuthenticationMechanismsHandler.handleRequest(AuthenticationMechanismsHandler.java:60)
at io.undertow.servlet.handlers.security.CachedAuthenticatedSessionHandler.handleRequest(CachedAuthenticatedSessionHandler.java:77)
at io.undertow.security.handlers.AbstractSecurityContextAssociationHandler.handleRequest(AbstractSecurityContextAssociationHandler.java:43)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.SendErrorPageHandler.handleRequest(SendErrorPageHandler.java:52)
at io.undertow.server.handlers.PredicateHandler.handleRequest(PredicateHandler.java:43)
at io.undertow.servlet.handlers.SessionRestoringHandler.handleRequest(SessionRestoringHandler.java:119)
at io.undertow.servlet.handlers.ServletInitialHandler.handleFirstRequest(ServletInitialHandler.java:275)
at io.undertow.servlet.handlers.ServletInitialHandler.access$100(ServletInitialHandler.java:79)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:134)
at io.undertow.servlet.handlers.ServletInitialHandler$2.call(ServletInitialHandler.java:131)
at io.undertow.servlet.core.ServletRequestContextThreadSetupAction$1.call(ServletRequestContextThreadSetupAction.java:48)
at io.undertow.servlet.core.ContextClassLoaderSetupAction$1.call(ContextClassLoaderSetupAction.java:43)
at io.undertow.servlet.handlers.ServletInitialHandler.dispatchRequest(ServletInitialHandler.java:255)
at io.undertow.servlet.handlers.ServletInitialHandler.access$000(ServletInitialHandler.java:79)
at io.undertow.servlet.handlers.ServletInitialHandler$1.handleRequest(ServletInitialHandler.java:100)
at io.undertow.server.Connectors.executeRootHandler(Connectors.java:387)
at io.undertow.server.HttpServerExchange$1.run(HttpServerExchange.java:852)
at org.jboss.threads.ContextClassLoaderSavingRunnable.run(ContextClassLoaderSavingRunnable.java:35)
at org.jboss.threads.EnhancedQueueExecutor.safeRun(EnhancedQueueExecutor.java:2019)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.doRunTask(EnhancedQueueExecutor.java:1558)
at org.jboss.threads.EnhancedQueueExecutor$ThreadBody.run(EnhancedQueueExecutor.java:1423)
at org.xnio.XnioWorker$WorkerThreadFactory$1$1.run(XnioWorker.java:1280)
at java.lang.Thread.run(Thread.java:750)
Caused by: java.io.FileNotFoundException: Invalid file path
at java.io.FileOutputStream.<init>(FileOutputStream.java:206)
at java.io.FileOutputStream.<init>(FileOutputStream.java:101)
at org.xnio.channels.Channels$4.run(Channels.java:1098)
... 46 more
