https://tomcat.apache.org/: Tomcat Servlet Engine Core Classes and Standard implementations 
public final class org.apache.catalina.valves.Constants$AccessLog
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: org.apache.catalina.valves.Constants$AccessLog
  super_class: java.lang.Object
{
  public static final java.lang.String COMMON_ALIAS;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "common"

  public static final java.lang.String COMMON_PATTERN;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "%h %l %u %t \"%r\" %s %b"

  public static final java.lang.String COMBINED_ALIAS;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "combined"

  public static final java.lang.String COMBINED_PATTERN;
    descriptor: Ljava/lang/String;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL
    ConstantValue: "%h %l %u %t \"%r\" %s %b \"%{Referer}i\" \"%{User-Agent}i\""

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.catalina.valves.Constants$AccessLog this
         0: .line 32
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
            return
        end local 0 // org.apache.catalina.valves.Constants$AccessLog this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/catalina/valves/Constants$AccessLog;
}
SourceFile: "Constants.java"
NestHost: org.apache.catalina.valves.Constants
InnerClasses:
  public final AccessLog = org.apache.catalina.valves.Constants$AccessLog of org.apache.catalina.valves.Constants