https://eclipse.org/jetty/jetty-util: Utility classes for Jetty (Webtide) 
public interface org.eclipse.jetty.util.thread.SerializedExecutor$ErrorHandlingTask extends java.lang.Runnable, java.util.function.Consumer<java.lang.Throwable>
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.eclipse.jetty.util.thread.SerializedExecutor$ErrorHandlingTask
  super_class: java.lang.Object
{
}
Signature: Ljava/lang/Object;Ljava/lang/Runnable;Ljava/util/function/Consumer<Ljava/lang/Throwable;>;
SourceFile: "SerializedExecutor.java"
NestHost: org.eclipse.jetty.util.thread.SerializedExecutor
InnerClasses:
  public abstract ErrorHandlingTask = org.eclipse.jetty.util.thread.SerializedExecutor$ErrorHandlingTask of org.eclipse.jetty.util.thread.SerializedExecutor