https://tomcat.apache.org/: Tomcat Servlet Engine Core Classes and Standard implementations 
public class org.apache.catalina.startup.SafeForkJoinWorkerThreadFactory implements java.util.concurrent.ForkJoinPool$ForkJoinWorkerThreadFactory
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.catalina.startup.SafeForkJoinWorkerThreadFactory
  super_class: java.lang.Object
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.catalina.startup.SafeForkJoinWorkerThreadFactory this
         0: .line 31
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.apache.catalina.startup.SafeForkJoinWorkerThreadFactory this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/catalina/startup/SafeForkJoinWorkerThreadFactory;

  public java.util.concurrent.ForkJoinWorkerThread newThread(java.util.concurrent.ForkJoinPool);
    descriptor: (Ljava/util/concurrent/ForkJoinPool;)Ljava/util/concurrent/ForkJoinWorkerThread;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=2
        start local 0 // org.apache.catalina.startup.SafeForkJoinWorkerThreadFactory this
        start local 1 // java.util.concurrent.ForkJoinPool pool
         0: .line 35
            new org.apache.catalina.startup.SafeForkJoinWorkerThreadFactory$SafeForkJoinWorkerThread
            dup
            aload 1 /* pool */
            invokespecial org.apache.catalina.startup.SafeForkJoinWorkerThreadFactory$SafeForkJoinWorkerThread.<init>:(Ljava/util/concurrent/ForkJoinPool;)V
            areturn
        end local 1 // java.util.concurrent.ForkJoinPool pool
        end local 0 // org.apache.catalina.startup.SafeForkJoinWorkerThreadFactory this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/catalina/startup/SafeForkJoinWorkerThreadFactory;
            0    1     1  pool  Ljava/util/concurrent/ForkJoinPool;
    MethodParameters:
      Name  Flags
      pool  
}
SourceFile: "SafeForkJoinWorkerThreadFactory.java"
NestMembers:
  org.apache.catalina.startup.SafeForkJoinWorkerThreadFactory$SafeForkJoinWorkerThread
InnerClasses:
  public abstract ForkJoinWorkerThreadFactory = java.util.concurrent.ForkJoinPool$ForkJoinWorkerThreadFactory of java.util.concurrent.ForkJoinPool
  private SafeForkJoinWorkerThread = org.apache.catalina.startup.SafeForkJoinWorkerThreadFactory$SafeForkJoinWorkerThread of org.apache.catalina.startup.SafeForkJoinWorkerThreadFactory