https://tomcat.apache.org/: Tomcat Core Logging Package 
public class org.apache.juli.logging.LogFactory
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.juli.logging.LogFactory
  super_class: java.lang.Object
{
  private static final org.apache.juli.logging.LogFactory singleton;
    descriptor: Lorg/apache/juli/logging/LogFactory;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private final java.lang.reflect.Constructor<? extends org.apache.juli.logging.Log> discoveredLogConstructor;
    descriptor: Ljava/lang/reflect/Constructor;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/lang/reflect/Constructor<+Lorg/apache/juli/logging/Log;>;

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 66
            new org.apache.juli.logging.LogFactory
            dup
            invokespecial org.apache.juli.logging.LogFactory.<init>:()V
            putstatic org.apache.juli.logging.LogFactory.singleton:Lorg/apache/juli/logging/LogFactory;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>();
    descriptor: ()V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=5, locals=7, args_size=1
        start local 0 // org.apache.juli.logging.LogFactory this
         0: .line 73
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 85
            invokestatic java.nio.file.FileSystems.getDefault:()Ljava/nio/file/FileSystem;
            pop
         2: .line 89
            ldc Lorg/apache/juli/logging/Log;
            invokestatic java.util.ServiceLoader.load:(Ljava/lang/Class;)Ljava/util/ServiceLoader;
            astore 1 /* logLoader */
        start local 1 // java.util.ServiceLoader logLoader
         3: .line 90
            aconst_null
            astore 2 /* m */
        start local 2 // java.lang.reflect.Constructor m
         4: .line 91
            aload 1 /* logLoader */
            invokevirtual java.util.ServiceLoader.iterator:()Ljava/util/Iterator;
            astore 4
            aload 4
            invokeinterface java.util.Iterator.hasNext:()Z
            ifeq 10
            aload 4
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast org.apache.juli.logging.Log
            astore 3 /* log */
        start local 3 // org.apache.juli.logging.Log log
         5: .line 92
            aload 3 /* log */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            astore 5 /* c */
        start local 5 // java.lang.Class c
         6: .line 94
            aload 5 /* c */
            iconst_1
            anewarray java.lang.Class
            dup
            iconst_0
            ldc Ljava/lang/String;
            aastore
            invokevirtual java.lang.Class.getConstructor:([Ljava/lang/Class;)Ljava/lang/reflect/Constructor;
            astore 2 /* m */
         7: .line 95
            goto 10
         8: .line 97
      StackMap locals: org.apache.juli.logging.LogFactory java.util.ServiceLoader java.lang.reflect.Constructor org.apache.juli.logging.Log java.util.Iterator java.lang.Class
      StackMap stack: java.lang.Exception
            astore 6 /* e */
        start local 6 // java.lang.Exception e
         9: .line 98
            new java.lang.Error
            dup
            aload 6 /* e */
            invokespecial java.lang.Error.<init>:(Ljava/lang/Throwable;)V
            athrow
        end local 6 // java.lang.Exception e
        end local 5 // java.lang.Class c
        end local 3 // org.apache.juli.logging.Log log
        10: .line 101
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            aload 2 /* m */
            putfield org.apache.juli.logging.LogFactory.discoveredLogConstructor:Ljava/lang/reflect/Constructor;
        11: .line 102
            return
        end local 2 // java.lang.reflect.Constructor m
        end local 1 // java.util.ServiceLoader logLoader
        end local 0 // org.apache.juli.logging.LogFactory this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0   12     0       this  Lorg/apache/juli/logging/LogFactory;
            3   12     1  logLoader  Ljava/util/ServiceLoader<Lorg/apache/juli/logging/Log;>;
            4   12     2          m  Ljava/lang/reflect/Constructor<+Lorg/apache/juli/logging/Log;>;
            5   10     3        log  Lorg/apache/juli/logging/Log;
            6   10     5          c  Ljava/lang/Class<+Lorg/apache/juli/logging/Log;>;
            9   10     6          e  Ljava/lang/Exception;
      Exception table:
        from    to  target  type
           6     7       8  Class java.lang.NoSuchMethodException
           6     7       8  Class java.lang.SecurityException

  public org.apache.juli.logging.Log getInstance(java.lang.String);
    descriptor: (Ljava/lang/String;)Lorg/apache/juli/logging/Log;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=3, args_size=2
        start local 0 // org.apache.juli.logging.LogFactory this
        start local 1 // java.lang.String name
         0: .line 129
            aload 0 /* this */
            getfield org.apache.juli.logging.LogFactory.discoveredLogConstructor:Ljava/lang/reflect/Constructor;
            ifnonnull 2
         1: .line 130
            aload 1 /* name */
            invokestatic org.apache.juli.logging.DirectJDKLog.getInstance:(Ljava/lang/String;)Lorg/apache/juli/logging/Log;
            areturn
         2: .line 134
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.juli.logging.LogFactory.discoveredLogConstructor:Ljava/lang/reflect/Constructor;
            iconst_1
            anewarray java.lang.Object
            dup
            iconst_0
            aload 1 /* name */
            aastore
            invokevirtual java.lang.reflect.Constructor.newInstance:([Ljava/lang/Object;)Ljava/lang/Object;
            checkcast org.apache.juli.logging.Log
         3: areturn
         4: .line 135
      StackMap locals:
      StackMap stack: java.lang.Exception
            astore 2 /* e */
        start local 2 // java.lang.Exception e
         5: .line 136
            new org.apache.juli.logging.LogConfigurationException
            dup
            aload 2 /* e */
            invokespecial org.apache.juli.logging.LogConfigurationException.<init>:(Ljava/lang/Throwable;)V
            athrow
        end local 2 // java.lang.Exception e
        end local 1 // java.lang.String name
        end local 0 // org.apache.juli.logging.LogFactory this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    6     0  this  Lorg/apache/juli/logging/LogFactory;
            0    6     1  name  Ljava/lang/String;
            5    6     2     e  Ljava/lang/Exception;
      Exception table:
        from    to  target  type
           2     3       4  Class java.lang.ReflectiveOperationException
           2     3       4  Class java.lang.IllegalArgumentException
    Exceptions:
      throws org.apache.juli.logging.LogConfigurationException
    MethodParameters:
      Name  Flags
      name  

  public org.apache.juli.logging.Log getInstance(java.lang.Class<?>);
    descriptor: (Ljava/lang/Class;)Lorg/apache/juli/logging/Log;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.juli.logging.LogFactory this
        start local 1 // java.lang.Class clazz
         0: .line 153
            aload 0 /* this */
            aload 1 /* clazz */
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            invokevirtual org.apache.juli.logging.LogFactory.getInstance:(Ljava/lang/String;)Lorg/apache/juli/logging/Log;
            areturn
        end local 1 // java.lang.Class clazz
        end local 0 // org.apache.juli.logging.LogFactory this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0   this  Lorg/apache/juli/logging/LogFactory;
            0    1     1  clazz  Ljava/lang/Class<*>;
    Exceptions:
      throws org.apache.juli.logging.LogConfigurationException
    Signature: (Ljava/lang/Class<*>;)Lorg/apache/juli/logging/Log;
    MethodParameters:
       Name  Flags
      clazz  

  public static org.apache.juli.logging.LogFactory getFactory();
    descriptor: ()Lorg/apache/juli/logging/LogFactory;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 191
            getstatic org.apache.juli.logging.LogFactory.singleton:Lorg/apache/juli/logging/LogFactory;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    Exceptions:
      throws org.apache.juli.logging.LogConfigurationException

  public static org.apache.juli.logging.Log getLog(java.lang.Class<?>);
    descriptor: (Ljava/lang/Class;)Lorg/apache/juli/logging/Log;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // java.lang.Class clazz
         0: .line 208
            invokestatic org.apache.juli.logging.LogFactory.getFactory:()Lorg/apache/juli/logging/LogFactory;
            aload 0 /* clazz */
            invokevirtual org.apache.juli.logging.LogFactory.getInstance:(Ljava/lang/Class;)Lorg/apache/juli/logging/Log;
            areturn
        end local 0 // java.lang.Class clazz
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    1     0  clazz  Ljava/lang/Class<*>;
    Exceptions:
      throws org.apache.juli.logging.LogConfigurationException
    Signature: (Ljava/lang/Class<*>;)Lorg/apache/juli/logging/Log;
    MethodParameters:
       Name  Flags
      clazz  

  public static org.apache.juli.logging.Log getLog(java.lang.String);
    descriptor: (Ljava/lang/String;)Lorg/apache/juli/logging/Log;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // java.lang.String name
         0: .line 227
            invokestatic org.apache.juli.logging.LogFactory.getFactory:()Lorg/apache/juli/logging/LogFactory;
            aload 0 /* name */
            invokevirtual org.apache.juli.logging.LogFactory.getInstance:(Ljava/lang/String;)Lorg/apache/juli/logging/Log;
            areturn
        end local 0 // java.lang.String name
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  name  Ljava/lang/String;
    Exceptions:
      throws org.apache.juli.logging.LogConfigurationException
    MethodParameters:
      Name  Flags
      name  

  public static void release(java.lang.ClassLoader);
    descriptor: (Ljava/lang/ClassLoader;)V
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // java.lang.ClassLoader classLoader
         0: .line 243
            invokestatic java.util.logging.LogManager.getLogManager:()Ljava/util/logging/LogManager;
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
         1: .line 244
            ldc "java.util.logging.LogManager"
         2: .line 243
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
         3: .line 244
            ifne 5
         4: .line 245
            invokestatic java.util.logging.LogManager.getLogManager:()Ljava/util/logging/LogManager;
            invokevirtual java.util.logging.LogManager.reset:()V
         5: .line 247
      StackMap locals:
      StackMap stack:
            return
        end local 0 // java.lang.ClassLoader classLoader
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    6     0  classLoader  Ljava/lang/ClassLoader;
    MethodParameters:
             Name  Flags
      classLoader  
}
SourceFile: "LogFactory.java"