https://tomcat.apache.org/: Tomcat Servlet Engine Core Classes and Standard implementations 
public class org.apache.catalina.users.MemoryGroup extends org.apache.catalina.users.AbstractGroup
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.catalina.users.MemoryGroup
  super_class: org.apache.catalina.users.AbstractGroup
{
  protected final org.apache.catalina.users.MemoryUserDatabase database;
    descriptor: Lorg/apache/catalina/users/MemoryUserDatabase;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL

  protected final java.util.ArrayList<org.apache.catalina.Role> roles;
    descriptor: Ljava/util/ArrayList;
    flags: (0x0014) ACC_PROTECTED, ACC_FINAL
    Signature: Ljava/util/ArrayList<Lorg/apache/catalina/Role;>;

  void <init>(org.apache.catalina.users.MemoryUserDatabase, java.lang.String, java.lang.String);
    descriptor: (Lorg/apache/catalina/users/MemoryUserDatabase;Ljava/lang/String;Ljava/lang/String;)V
    flags: (0x0000) 
    Code:
      stack=3, locals=4, args_size=4
        start local 0 // org.apache.catalina.users.MemoryGroup this
        start local 1 // org.apache.catalina.users.MemoryUserDatabase database
        start local 2 // java.lang.String groupname
        start local 3 // java.lang.String description
         0: .line 56
            aload 0 /* this */
            invokespecial org.apache.catalina.users.AbstractGroup.<init>:()V
         1: .line 76
            aload 0 /* this */
            new java.util.ArrayList
            dup
            invokespecial java.util.ArrayList.<init>:()V
            putfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
         2: .line 57
            aload 0 /* this */
            aload 1 /* database */
            putfield org.apache.catalina.users.MemoryGroup.database:Lorg/apache/catalina/users/MemoryUserDatabase;
         3: .line 58
            aload 0 /* this */
            aload 2 /* groupname */
            invokevirtual org.apache.catalina.users.MemoryGroup.setGroupname:(Ljava/lang/String;)V
         4: .line 59
            aload 0 /* this */
            aload 3 /* description */
            invokevirtual org.apache.catalina.users.MemoryGroup.setDescription:(Ljava/lang/String;)V
         5: .line 61
            return
        end local 3 // java.lang.String description
        end local 2 // java.lang.String groupname
        end local 1 // org.apache.catalina.users.MemoryUserDatabase database
        end local 0 // org.apache.catalina.users.MemoryGroup this
      LocalVariableTable:
        Start  End  Slot         Name  Signature
            0    6     0         this  Lorg/apache/catalina/users/MemoryGroup;
            0    6     1     database  Lorg/apache/catalina/users/MemoryUserDatabase;
            0    6     2    groupname  Ljava/lang/String;
            0    6     3  description  Ljava/lang/String;
    MethodParameters:
             Name  Flags
      database     
      groupname    
      description  

  public java.util.Iterator<org.apache.catalina.Role> getRoles();
    descriptor: ()Ljava/util/Iterator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.apache.catalina.users.MemoryGroup this
         0: .line 87
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            dup
            astore 1
            monitorenter
         1: .line 88
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            invokevirtual java.util.ArrayList.iterator:()Ljava/util/Iterator;
            aload 1
            monitorexit
         2: areturn
         3: .line 87
      StackMap locals: org.apache.catalina.users.MemoryGroup java.util.ArrayList
      StackMap stack: java.lang.Throwable
            aload 1
            monitorexit
         4: athrow
        end local 0 // org.apache.catalina.users.MemoryGroup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/apache/catalina/users/MemoryGroup;
      Exception table:
        from    to  target  type
           1     2       3  any
           3     4       3  any
    Signature: ()Ljava/util/Iterator<Lorg/apache/catalina/Role;>;

  public org.apache.catalina.UserDatabase getUserDatabase();
    descriptor: ()Lorg/apache/catalina/UserDatabase;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.catalina.users.MemoryGroup this
         0: .line 98
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.database:Lorg/apache/catalina/users/MemoryUserDatabase;
            areturn
        end local 0 // org.apache.catalina.users.MemoryGroup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/catalina/users/MemoryGroup;

  public java.util.Iterator<org.apache.catalina.User> getUsers();
    descriptor: ()Ljava/util/Iterator;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=4, args_size=1
        start local 0 // org.apache.catalina.users.MemoryGroup this
         0: .line 107
            new java.util.ArrayList
            dup
            invokespecial java.util.ArrayList.<init>:()V
            astore 1 /* results */
        start local 1 // java.util.List results
         1: .line 108
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.database:Lorg/apache/catalina/users/MemoryUserDatabase;
            invokevirtual org.apache.catalina.users.MemoryUserDatabase.getUsers:()Ljava/util/Iterator;
            astore 2 /* users */
        start local 2 // java.util.Iterator users
         2: .line 109
            goto 6
         3: .line 110
      StackMap locals: java.util.List java.util.Iterator
      StackMap stack:
            aload 2 /* users */
            invokeinterface java.util.Iterator.next:()Ljava/lang/Object;
            checkcast org.apache.catalina.User
            astore 3 /* user */
        start local 3 // org.apache.catalina.User user
         4: .line 111
            aload 3 /* user */
            aload 0 /* this */
            invokeinterface org.apache.catalina.User.isInGroup:(Lorg/apache/catalina/Group;)Z
            ifeq 6
         5: .line 112
            aload 1 /* results */
            aload 3 /* user */
            invokeinterface java.util.List.add:(Ljava/lang/Object;)Z
            pop
        end local 3 // org.apache.catalina.User user
         6: .line 109
      StackMap locals:
      StackMap stack:
            aload 2 /* users */
            invokeinterface java.util.Iterator.hasNext:()Z
            ifne 3
         7: .line 115
            aload 1 /* results */
            invokeinterface java.util.List.iterator:()Ljava/util/Iterator;
            areturn
        end local 2 // java.util.Iterator users
        end local 1 // java.util.List results
        end local 0 // org.apache.catalina.users.MemoryGroup this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    8     0     this  Lorg/apache/catalina/users/MemoryGroup;
            1    8     1  results  Ljava/util/List<Lorg/apache/catalina/User;>;
            2    8     2    users  Ljava/util/Iterator<Lorg/apache/catalina/User;>;
            4    6     3     user  Lorg/apache/catalina/User;
    Signature: ()Ljava/util/Iterator<Lorg/apache/catalina/User;>;

  public void addRole(org.apache.catalina.Role);
    descriptor: (Lorg/apache/catalina/Role;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.apache.catalina.users.MemoryGroup this
        start local 1 // org.apache.catalina.Role role
         0: .line 129
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            dup
            astore 2
            monitorenter
         1: .line 130
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            aload 1 /* role */
            invokevirtual java.util.ArrayList.contains:(Ljava/lang/Object;)Z
            ifne 3
         2: .line 131
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            aload 1 /* role */
            invokevirtual java.util.ArrayList.add:(Ljava/lang/Object;)Z
            pop
         3: .line 129
      StackMap locals: java.util.ArrayList
      StackMap stack:
            aload 2
            monitorexit
         4: goto 7
      StackMap locals:
      StackMap stack: java.lang.Throwable
         5: aload 2
            monitorexit
         6: athrow
         7: .line 134
      StackMap locals:
      StackMap stack:
            return
        end local 1 // org.apache.catalina.Role role
        end local 0 // org.apache.catalina.users.MemoryGroup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    8     0  this  Lorg/apache/catalina/users/MemoryGroup;
            0    8     1  role  Lorg/apache/catalina/Role;
      Exception table:
        from    to  target  type
           1     4       5  any
           5     6       5  any
    MethodParameters:
      Name  Flags
      role  

  public boolean isInRole(org.apache.catalina.Role);
    descriptor: (Lorg/apache/catalina/Role;)Z
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.apache.catalina.users.MemoryGroup this
        start local 1 // org.apache.catalina.Role role
         0: .line 144
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            dup
            astore 2
            monitorenter
         1: .line 145
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            aload 1 /* role */
            invokevirtual java.util.ArrayList.contains:(Ljava/lang/Object;)Z
            aload 2
            monitorexit
         2: ireturn
         3: .line 144
      StackMap locals: org.apache.catalina.users.MemoryGroup org.apache.catalina.Role java.util.ArrayList
      StackMap stack: java.lang.Throwable
            aload 2
            monitorexit
         4: athrow
        end local 1 // org.apache.catalina.Role role
        end local 0 // org.apache.catalina.users.MemoryGroup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/apache/catalina/users/MemoryGroup;
            0    5     1  role  Lorg/apache/catalina/Role;
      Exception table:
        from    to  target  type
           1     2       3  any
           3     4       3  any
    MethodParameters:
      Name  Flags
      role  

  public void removeRole(org.apache.catalina.Role);
    descriptor: (Lorg/apache/catalina/Role;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // org.apache.catalina.users.MemoryGroup this
        start local 1 // org.apache.catalina.Role role
         0: .line 157
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            dup
            astore 2
            monitorenter
         1: .line 158
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            aload 1 /* role */
            invokevirtual java.util.ArrayList.remove:(Ljava/lang/Object;)Z
            pop
         2: .line 157
            aload 2
            monitorexit
         3: goto 6
      StackMap locals: org.apache.catalina.users.MemoryGroup org.apache.catalina.Role java.util.ArrayList
      StackMap stack: java.lang.Throwable
         4: aload 2
            monitorexit
         5: athrow
         6: .line 160
      StackMap locals:
      StackMap stack:
            return
        end local 1 // org.apache.catalina.Role role
        end local 0 // org.apache.catalina.users.MemoryGroup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  this  Lorg/apache/catalina/users/MemoryGroup;
            0    7     1  role  Lorg/apache/catalina/Role;
      Exception table:
        from    to  target  type
           1     3       4  any
           4     5       4  any
    MethodParameters:
      Name  Flags
      role  

  public void removeRoles();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.apache.catalina.users.MemoryGroup this
         0: .line 168
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            dup
            astore 1
            monitorenter
         1: .line 169
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            invokevirtual java.util.ArrayList.clear:()V
         2: .line 168
            aload 1
            monitorexit
         3: goto 6
      StackMap locals: org.apache.catalina.users.MemoryGroup java.util.ArrayList
      StackMap stack: java.lang.Throwable
         4: aload 1
            monitorexit
         5: athrow
         6: .line 171
      StackMap locals:
      StackMap stack:
            return
        end local 0 // org.apache.catalina.users.MemoryGroup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  this  Lorg/apache/catalina/users/MemoryGroup;
      Exception table:
        from    to  target  type
           1     3       4  any
           4     5       4  any

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=3, args_size=1
        start local 0 // org.apache.catalina.users.MemoryGroup this
         0: .line 179
            new java.lang.StringBuilder
            dup
            ldc "<group groupname=\""
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            astore 1 /* sb */
        start local 1 // java.lang.StringBuilder sb
         1: .line 180
            aload 1 /* sb */
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.groupname:Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         2: .line 181
            aload 1 /* sb */
            ldc "\""
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         3: .line 182
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.description:Ljava/lang/String;
            ifnull 7
         4: .line 183
            aload 1 /* sb */
            ldc " description=\""
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         5: .line 184
            aload 1 /* sb */
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.description:Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         6: .line 185
            aload 1 /* sb */
            ldc "\""
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         7: .line 187
      StackMap locals: java.lang.StringBuilder
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            dup
            astore 2
            monitorenter
         8: .line 188
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            invokevirtual java.util.ArrayList.size:()I
            ifle 12
         9: .line 189
            aload 1 /* sb */
            ldc " roles=\""
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        10: .line 190
            aload 0 /* this */
            getfield org.apache.catalina.users.MemoryGroup.roles:Ljava/util/ArrayList;
            bipush 44
            invokedynamic apply()Ljava/util/function/Function;
              Bootstrap: invokestatic java.lang.invoke.LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
                Method arguments:
                  (Ljava/lang/Object;)Ljava/lang/Object;
                  org/apache/catalina/Role.getRolename()Ljava/lang/String; (9 itf)
                  (Lorg/apache/catalina/Role;)Ljava/lang/String;
            aload 1 /* sb */
            invokestatic org.apache.tomcat.util.buf.StringUtils.join:(Ljava/lang/Iterable;CLjava/util/function/Function;Ljava/lang/StringBuilder;)V
        11: .line 191
            aload 1 /* sb */
            ldc "\""
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        12: .line 187
      StackMap locals: java.util.ArrayList
      StackMap stack:
            aload 2
            monitorexit
        13: goto 16
      StackMap locals:
      StackMap stack: java.lang.Throwable
        14: aload 2
            monitorexit
        15: athrow
        16: .line 194
      StackMap locals:
      StackMap stack:
            aload 1 /* sb */
            ldc "/>"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        17: .line 195
            aload 1 /* sb */
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 1 // java.lang.StringBuilder sb
        end local 0 // org.apache.catalina.users.MemoryGroup this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   18     0  this  Lorg/apache/catalina/users/MemoryGroup;
            1   18     1    sb  Ljava/lang/StringBuilder;
      Exception table:
        from    to  target  type
           8    13      14  any
          14    15      14  any
}
SourceFile: "MemoryGroup.java"
InnerClasses:
  public final Lookup = java.lang.invoke.MethodHandles$Lookup of java.lang.invoke.MethodHandles