https://tomcat.apache.org/: Common code shared by multiple Tomcat components 
public class org.apache.tomcat.util.collections.CaseInsensitiveKeyMap<V> extends java.util.AbstractMap<java.lang.String, V>
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.tomcat.util.collections.CaseInsensitiveKeyMap
  super_class: java.util.AbstractMap
{
  private static final org.apache.tomcat.util.res.StringManager sm;
    descriptor: Lorg/apache/tomcat/util/res/StringManager;
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL

  private final java.util.Map<org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$Key, V> map;
    descriptor: Ljava/util/Map;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Ljava/util/Map<Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap$Key;TV;>;

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=1, locals=0, args_size=0
         0: .line 43
            ldc Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap;
            invokestatic org.apache.tomcat.util.res.StringManager.getManager:(Ljava/lang/Class;)Lorg/apache/tomcat/util/res/StringManager;
         1: .line 42
            putstatic org.apache.tomcat.util.collections.CaseInsensitiveKeyMap.sm:Lorg/apache/tomcat/util/res/StringManager;
         2: .line 43
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
         0: .line 40
            aload 0 /* this */
            invokespecial java.util.AbstractMap.<init>:()V
         1: .line 45
            aload 0 /* this */
            new java.util.HashMap
            dup
            invokespecial java.util.HashMap.<init>:()V
            putfield org.apache.tomcat.util.collections.CaseInsensitiveKeyMap.map:Ljava/util/Map;
         2: .line 40
            return
        end local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap<TV;>;

  public V get();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
        start local 1 // java.lang.Object key
         0: .line 50
            aload 0 /* this */
            getfield org.apache.tomcat.util.collections.CaseInsensitiveKeyMap.map:Ljava/util/Map;
            aload 1 /* key */
            invokestatic org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$Key.getInstance:(Ljava/lang/Object;)Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap$Key;
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 1 // java.lang.Object key
        end local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap<TV;>;
            0    1     1   key  Ljava/lang/Object;
    Signature: (Ljava/lang/Object;)TV;
    MethodParameters:
      Name  Flags
      key   

  public V put(java.lang.String, );
    descriptor: (Ljava/lang/String;Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=4, args_size=3
        start local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
        start local 1 // java.lang.String key
        start local 2 // java.lang.Object value
         0: .line 56
            aload 1 /* key */
            invokestatic org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$Key.getInstance:(Ljava/lang/Object;)Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap$Key;
            astore 3 /* caseInsensitiveKey */
        start local 3 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$Key caseInsensitiveKey
         1: .line 57
            aload 3 /* caseInsensitiveKey */
            ifnonnull 3
         2: .line 58
            new java.lang.NullPointerException
            dup
            getstatic org.apache.tomcat.util.collections.CaseInsensitiveKeyMap.sm:Lorg/apache/tomcat/util/res/StringManager;
            ldc "caseInsensitiveKeyMap.nullKey"
            invokevirtual org.apache.tomcat.util.res.StringManager.getString:(Ljava/lang/String;)Ljava/lang/String;
            invokespecial java.lang.NullPointerException.<init>:(Ljava/lang/String;)V
            athrow
         3: .line 60
      StackMap locals: org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$Key
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.tomcat.util.collections.CaseInsensitiveKeyMap.map:Ljava/util/Map;
            aload 3 /* caseInsensitiveKey */
            aload 2 /* value */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 3 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$Key caseInsensitiveKey
        end local 2 // java.lang.Object value
        end local 1 // java.lang.String key
        end local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
      LocalVariableTable:
        Start  End  Slot                Name  Signature
            0    4     0                this  Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap<TV;>;
            0    4     1                 key  Ljava/lang/String;
            0    4     2               value  TV;
            1    4     3  caseInsensitiveKey  Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap$Key;
    Signature: (Ljava/lang/String;TV;)TV;
    MethodParameters:
       Name  Flags
      key    
      value  

  public void putAll(java.util.Map<? extends java.lang.String, ? extends V>);
    descriptor: (Ljava/util/Map;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
        start local 1 // java.util.Map m
         0: .line 73
            aload 0 /* this */
            aload 1 /* m */
            invokespecial java.util.AbstractMap.putAll:(Ljava/util/Map;)V
         1: .line 74
            return
        end local 1 // java.util.Map m
        end local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap<TV;>;
            0    2     1     m  Ljava/util/Map<+Ljava/lang/String;+TV;>;
    Signature: (Ljava/util/Map<+Ljava/lang/String;+TV;>;)V
    MethodParameters:
      Name  Flags
      m     

  public boolean containsKey(java.lang.Object);
    descriptor: (Ljava/lang/Object;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
        start local 1 // java.lang.Object key
         0: .line 79
            aload 0 /* this */
            getfield org.apache.tomcat.util.collections.CaseInsensitiveKeyMap.map:Ljava/util/Map;
            aload 1 /* key */
            invokestatic org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$Key.getInstance:(Ljava/lang/Object;)Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap$Key;
            invokeinterface java.util.Map.containsKey:(Ljava/lang/Object;)Z
            ireturn
        end local 1 // java.lang.Object key
        end local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap<TV;>;
            0    1     1   key  Ljava/lang/Object;
    MethodParameters:
      Name  Flags
      key   

  public V remove();
    descriptor: (Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
        start local 1 // java.lang.Object key
         0: .line 85
            aload 0 /* this */
            getfield org.apache.tomcat.util.collections.CaseInsensitiveKeyMap.map:Ljava/util/Map;
            aload 1 /* key */
            invokestatic org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$Key.getInstance:(Ljava/lang/Object;)Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap$Key;
            invokeinterface java.util.Map.remove:(Ljava/lang/Object;)Ljava/lang/Object;
            areturn
        end local 1 // java.lang.Object key
        end local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap<TV;>;
            0    1     1   key  Ljava/lang/Object;
    Signature: (Ljava/lang/Object;)TV;
    MethodParameters:
      Name  Flags
      key   

  public java.util.Set<java.util.Map$Entry<java.lang.String, V>> entrySet();
    descriptor: ()Ljava/util/Set;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
         0: .line 91
            new org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$EntrySet
            dup
            aload 0 /* this */
            getfield org.apache.tomcat.util.collections.CaseInsensitiveKeyMap.map:Ljava/util/Map;
            invokeinterface java.util.Map.entrySet:()Ljava/util/Set;
            invokespecial org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$EntrySet.<init>:(Ljava/util/Set;)V
            areturn
        end local 0 // org.apache.tomcat.util.collections.CaseInsensitiveKeyMap this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/tomcat/util/collections/CaseInsensitiveKeyMap<TV;>;
    Signature: ()Ljava/util/Set<Ljava/util/Map$Entry<Ljava/lang/String;TV;>;>;

  public java.lang.Object put(java.lang.Object, java.lang.Object);
    descriptor: (Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
    flags: (0x1041) ACC_PUBLIC, ACC_BRIDGE, ACC_SYNTHETIC
    Code:
      stack=3, locals=3, args_size=3
         0: .line 1
            aload 0
            aload 1
            checkcast java.lang.String
            aload 2
            checkcast java.lang.Object
            invokevirtual org.apache.tomcat.util.collections.CaseInsensitiveKeyMap.put:(Ljava/lang/String;Ljava/lang/Object;)Ljava/lang/Object;
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
}
Signature: <V:Ljava/lang/Object;>Ljava/util/AbstractMap<Ljava/lang/String;TV;>;
SourceFile: "CaseInsensitiveKeyMap.java"
NestMembers:
  org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$EntryImpl  org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$EntryIterator  org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$EntrySet  org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$Key
InnerClasses:
  public abstract Entry = java.util.Map$Entry of java.util.Map
  private EntryImpl = org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$EntryImpl of org.apache.tomcat.util.collections.CaseInsensitiveKeyMap
  private EntryIterator = org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$EntryIterator of org.apache.tomcat.util.collections.CaseInsensitiveKeyMap
  private EntrySet = org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$EntrySet of org.apache.tomcat.util.collections.CaseInsensitiveKeyMap
  private Key = org.apache.tomcat.util.collections.CaseInsensitiveKeyMap$Key of org.apache.tomcat.util.collections.CaseInsensitiveKeyMap