https://tomcat.apache.org/: Tomcat Servlet Engine Core Classes and Standard implementations 
public class org.apache.catalina.util.ErrorPageSupport
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.catalina.util.ErrorPageSupport
  super_class: java.lang.Object
{
  private java.util.Map<java.lang.String, org.apache.tomcat.util.descriptor.web.ErrorPage> exceptionPages;
    descriptor: Ljava/util/Map;
    flags: (0x0002) ACC_PRIVATE
    Signature: Ljava/util/Map<Ljava/lang/String;Lorg/apache/tomcat/util/descriptor/web/ErrorPage;>;

  private java.util.Map<java.lang.Integer, org.apache.tomcat.util.descriptor.web.ErrorPage> statusPages;
    descriptor: Ljava/util/Map;
    flags: (0x0002) ACC_PRIVATE
    Signature: Ljava/util/Map<Ljava/lang/Integer;Lorg/apache/tomcat/util/descriptor/web/ErrorPage;>;

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // org.apache.catalina.util.ErrorPageSupport this
         0: .line 30
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 33
            aload 0 /* this */
            new java.util.concurrent.ConcurrentHashMap
            dup
            invokespecial java.util.concurrent.ConcurrentHashMap.<init>:()V
            putfield org.apache.catalina.util.ErrorPageSupport.exceptionPages:Ljava/util/Map;
         2: .line 36
            aload 0 /* this */
            new java.util.concurrent.ConcurrentHashMap
            dup
            invokespecial java.util.concurrent.ConcurrentHashMap.<init>:()V
            putfield org.apache.catalina.util.ErrorPageSupport.statusPages:Ljava/util/Map;
         3: .line 30
            return
        end local 0 // org.apache.catalina.util.ErrorPageSupport this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    4     0  this  Lorg/apache/catalina/util/ErrorPageSupport;

  public void add(org.apache.tomcat.util.descriptor.web.ErrorPage);
    descriptor: (Lorg/apache/tomcat/util/descriptor/web/ErrorPage;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // org.apache.catalina.util.ErrorPageSupport this
        start local 1 // org.apache.tomcat.util.descriptor.web.ErrorPage errorPage
         0: .line 40
            aload 1 /* errorPage */
            invokevirtual org.apache.tomcat.util.descriptor.web.ErrorPage.getExceptionType:()Ljava/lang/String;
            astore 2 /* exceptionType */
        start local 2 // java.lang.String exceptionType
         1: .line 41
            aload 2 /* exceptionType */
            ifnonnull 4
         2: .line 42
            aload 0 /* this */
            getfield org.apache.catalina.util.ErrorPageSupport.statusPages:Ljava/util/Map;
            aload 1 /* errorPage */
            invokevirtual org.apache.tomcat.util.descriptor.web.ErrorPage.getErrorCode:()I
            invokestatic java.lang.Integer.valueOf:(I)Ljava/lang/Integer;
            aload 1 /* errorPage */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         3: .line 43
            goto 5
         4: .line 44
      StackMap locals: java.lang.String
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.catalina.util.ErrorPageSupport.exceptionPages:Ljava/util/Map;
            aload 2 /* exceptionType */
            aload 1 /* errorPage */
            invokeinterface java.util.Map.put:(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
            pop
         5: .line 46
      StackMap locals:
      StackMap stack:
            return
        end local 2 // java.lang.String exceptionType
        end local 1 // org.apache.tomcat.util.descriptor.web.ErrorPage errorPage
        end local 0 // org.apache.catalina.util.ErrorPageSupport this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    6     0           this  Lorg/apache/catalina/util/ErrorPageSupport;
            0    6     1      errorPage  Lorg/apache/tomcat/util/descriptor/web/ErrorPage;
            1    6     2  exceptionType  Ljava/lang/String;
    MethodParameters:
           Name  Flags
      errorPage  

  public void remove(org.apache.tomcat.util.descriptor.web.ErrorPage);
    descriptor: (Lorg/apache/tomcat/util/descriptor/web/ErrorPage;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // org.apache.catalina.util.ErrorPageSupport this
        start local 1 // org.apache.tomcat.util.descriptor.web.ErrorPage errorPage
         0: .line 50
            aload 1 /* errorPage */
            invokevirtual org.apache.tomcat.util.descriptor.web.ErrorPage.getExceptionType:()Ljava/lang/String;
            astore 2 /* exceptionType */
        start local 2 // java.lang.String exceptionType
         1: .line 51
            aload 2 /* exceptionType */
            ifnonnull 4
         2: .line 52
            aload 0 /* this */
            getfield org.apache.catalina.util.ErrorPageSupport.statusPages:Ljava/util/Map;
            aload 1 /* errorPage */
            invokevirtual org.apache.tomcat.util.descriptor.web.ErrorPage.getErrorCode:()I
            invokestatic java.lang.Integer.valueOf:(I)Ljava/lang/Integer;
            aload 1 /* errorPage */
            invokeinterface java.util.Map.remove:(Ljava/lang/Object;Ljava/lang/Object;)Z
            pop
         3: .line 53
            goto 5
         4: .line 54
      StackMap locals: java.lang.String
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.catalina.util.ErrorPageSupport.exceptionPages:Ljava/util/Map;
            aload 2 /* exceptionType */
            aload 1 /* errorPage */
            invokeinterface java.util.Map.remove:(Ljava/lang/Object;Ljava/lang/Object;)Z
            pop
         5: .line 56
      StackMap locals:
      StackMap stack:
            return
        end local 2 // java.lang.String exceptionType
        end local 1 // org.apache.tomcat.util.descriptor.web.ErrorPage errorPage
        end local 0 // org.apache.catalina.util.ErrorPageSupport this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    6     0           this  Lorg/apache/catalina/util/ErrorPageSupport;
            0    6     1      errorPage  Lorg/apache/tomcat/util/descriptor/web/ErrorPage;
            1    6     2  exceptionType  Ljava/lang/String;
    MethodParameters:
           Name  Flags
      errorPage  

  public org.apache.tomcat.util.descriptor.web.ErrorPage find(int);
    descriptor: (I)Lorg/apache/tomcat/util/descriptor/web/ErrorPage;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.catalina.util.ErrorPageSupport this
        start local 1 // int statusCode
         0: .line 60
            aload 0 /* this */
            getfield org.apache.catalina.util.ErrorPageSupport.statusPages:Ljava/util/Map;
            iload 1 /* statusCode */
            invokestatic java.lang.Integer.valueOf:(I)Ljava/lang/Integer;
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast org.apache.tomcat.util.descriptor.web.ErrorPage
            areturn
        end local 1 // int statusCode
        end local 0 // org.apache.catalina.util.ErrorPageSupport this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    1     0        this  Lorg/apache/catalina/util/ErrorPageSupport;
            0    1     1  statusCode  I
    MethodParameters:
            Name  Flags
      statusCode  

  public org.apache.tomcat.util.descriptor.web.ErrorPage find(java.lang.String);
    descriptor: (Ljava/lang/String;)Lorg/apache/tomcat/util/descriptor/web/ErrorPage;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.catalina.util.ErrorPageSupport this
        start local 1 // java.lang.String exceptionType
         0: .line 73
            aload 0 /* this */
            getfield org.apache.catalina.util.ErrorPageSupport.exceptionPages:Ljava/util/Map;
            aload 1 /* exceptionType */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast org.apache.tomcat.util.descriptor.web.ErrorPage
            areturn
        end local 1 // java.lang.String exceptionType
        end local 0 // org.apache.catalina.util.ErrorPageSupport this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    1     0           this  Lorg/apache/catalina/util/ErrorPageSupport;
            0    1     1  exceptionType  Ljava/lang/String;
    MethodParameters:
               Name  Flags
      exceptionType  

  public org.apache.tomcat.util.descriptor.web.ErrorPage find(java.lang.Throwable);
    descriptor: (Ljava/lang/Throwable;)Lorg/apache/tomcat/util/descriptor/web/ErrorPage;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=5, args_size=2
        start local 0 // org.apache.catalina.util.ErrorPageSupport this
        start local 1 // java.lang.Throwable exceptionType
         0: .line 78
            aload 1 /* exceptionType */
            ifnonnull 2
         1: .line 79
            aconst_null
            areturn
         2: .line 81
      StackMap locals:
      StackMap stack:
            aload 1 /* exceptionType */
            invokevirtual java.lang.Object.getClass:()Ljava/lang/Class;
            astore 2 /* clazz */
        start local 2 // java.lang.Class clazz
         3: .line 82
            aload 2 /* clazz */
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            astore 3 /* name */
        start local 3 // java.lang.String name
         4: .line 83
            goto 12
         5: .line 84
      StackMap locals: java.lang.Class java.lang.String
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.catalina.util.ErrorPageSupport.exceptionPages:Ljava/util/Map;
            aload 3 /* name */
            invokeinterface java.util.Map.get:(Ljava/lang/Object;)Ljava/lang/Object;
            checkcast org.apache.tomcat.util.descriptor.web.ErrorPage
            astore 4 /* errorPage */
        start local 4 // org.apache.tomcat.util.descriptor.web.ErrorPage errorPage
         6: .line 85
            aload 4 /* errorPage */
            ifnull 8
         7: .line 86
            aload 4 /* errorPage */
            areturn
         8: .line 88
      StackMap locals: org.apache.tomcat.util.descriptor.web.ErrorPage
      StackMap stack:
            aload 2 /* clazz */
            invokevirtual java.lang.Class.getSuperclass:()Ljava/lang/Class;
            astore 2 /* clazz */
         9: .line 89
            aload 2 /* clazz */
            ifnonnull 11
        10: .line 90
            goto 13
        11: .line 92
      StackMap locals:
      StackMap stack:
            aload 2 /* clazz */
            invokevirtual java.lang.Class.getName:()Ljava/lang/String;
            astore 3 /* name */
        end local 4 // org.apache.tomcat.util.descriptor.web.ErrorPage errorPage
        12: .line 83
      StackMap locals:
      StackMap stack:
            ldc Ljava/lang/Object;
            aload 2 /* clazz */
            invokevirtual java.lang.Object.equals:(Ljava/lang/Object;)Z
            ifeq 5
        13: .line 94
      StackMap locals:
      StackMap stack:
            aconst_null
            areturn
        end local 3 // java.lang.String name
        end local 2 // java.lang.Class clazz
        end local 1 // java.lang.Throwable exceptionType
        end local 0 // org.apache.catalina.util.ErrorPageSupport this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0   14     0           this  Lorg/apache/catalina/util/ErrorPageSupport;
            0   14     1  exceptionType  Ljava/lang/Throwable;
            3   14     2          clazz  Ljava/lang/Class<*>;
            4   14     3           name  Ljava/lang/String;
            6   12     4      errorPage  Lorg/apache/tomcat/util/descriptor/web/ErrorPage;
    MethodParameters:
               Name  Flags
      exceptionType  

  public org.apache.tomcat.util.descriptor.web.ErrorPage[] findAll();
    descriptor: ()[Lorg/apache/tomcat/util/descriptor/web/ErrorPage;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=1
        start local 0 // org.apache.catalina.util.ErrorPageSupport this
         0: .line 99
            new java.util.HashSet
            dup
            invokespecial java.util.HashSet.<init>:()V
            astore 1 /* errorPages */
        start local 1 // java.util.Set errorPages
         1: .line 100
            aload 1 /* errorPages */
            aload 0 /* this */
            getfield org.apache.catalina.util.ErrorPageSupport.exceptionPages:Ljava/util/Map;
            invokeinterface java.util.Map.values:()Ljava/util/Collection;
            invokeinterface java.util.Set.addAll:(Ljava/util/Collection;)Z
            pop
         2: .line 101
            aload 1 /* errorPages */
            aload 0 /* this */
            getfield org.apache.catalina.util.ErrorPageSupport.statusPages:Ljava/util/Map;
            invokeinterface java.util.Map.values:()Ljava/util/Collection;
            invokeinterface java.util.Set.addAll:(Ljava/util/Collection;)Z
            pop
         3: .line 102
            aload 1 /* errorPages */
            iconst_0
            anewarray org.apache.tomcat.util.descriptor.web.ErrorPage
            invokeinterface java.util.Set.toArray:([Ljava/lang/Object;)[Ljava/lang/Object;
            checkcast org.apache.tomcat.util.descriptor.web.ErrorPage[]
            areturn
        end local 1 // java.util.Set errorPages
        end local 0 // org.apache.catalina.util.ErrorPageSupport this
      LocalVariableTable:
        Start  End  Slot        Name  Signature
            0    4     0        this  Lorg/apache/catalina/util/ErrorPageSupport;
            1    4     1  errorPages  Ljava/util/Set<Lorg/apache/tomcat/util/descriptor/web/ErrorPage;>;
}
SourceFile: "ErrorPageSupport.java"