https://tomcat.apache.org/: Common code shared by Catalina and Jasper for scanning JARS and processing XML descriptors 
public class org.apache.tomcat.util.descriptor.web.ErrorPage implements java.io.Serializable
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.tomcat.util.descriptor.web.ErrorPage
  super_class: java.lang.Object
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 1

  private int errorCode;
    descriptor: I
    flags: (0x0002) ACC_PRIVATE

  private java.lang.String exceptionType;
    descriptor: Ljava/lang/String;
    flags: (0x0002) ACC_PRIVATE

  private java.lang.String location;
    descriptor: Ljava/lang/String;
    flags: (0x0002) ACC_PRIVATE

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
         0: .line 30
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 41
            aload 0 /* this */
            iconst_0
            putfield org.apache.tomcat.util.descriptor.web.ErrorPage.errorCode:I
         2: .line 47
            aload 0 /* this */
            aconst_null
            putfield org.apache.tomcat.util.descriptor.web.ErrorPage.exceptionType:Ljava/lang/String;
         3: .line 53
            aload 0 /* this */
            aconst_null
            putfield org.apache.tomcat.util.descriptor.web.ErrorPage.location:Ljava/lang/String;
         4: .line 30
            return
        end local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    5     0  this  Lorg/apache/tomcat/util/descriptor/web/ErrorPage;

  public int getErrorCode();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
         0: .line 63
            aload 0 /* this */
            getfield org.apache.tomcat.util.descriptor.web.ErrorPage.errorCode:I
            ireturn
        end local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/tomcat/util/descriptor/web/ErrorPage;

  public void setErrorCode(int);
    descriptor: (I)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
        start local 1 // int errorCode
         0: .line 73
            aload 0 /* this */
            iload 1 /* errorCode */
            putfield org.apache.tomcat.util.descriptor.web.ErrorPage.errorCode:I
         1: .line 74
            return
        end local 1 // int errorCode
        end local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    2     0       this  Lorg/apache/tomcat/util/descriptor/web/ErrorPage;
            0    2     1  errorCode  I
    MethodParameters:
           Name  Flags
      errorCode  

  public void setErrorCode(java.lang.String);
    descriptor: (Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
        start local 1 // java.lang.String errorCode
         0: .line 85
            aload 0 /* this */
            aload 1 /* errorCode */
            invokestatic java.lang.Integer.parseInt:(Ljava/lang/String;)I
            putfield org.apache.tomcat.util.descriptor.web.ErrorPage.errorCode:I
         1: .line 86
            goto 4
      StackMap locals:
      StackMap stack: java.lang.NumberFormatException
         2: astore 2 /* nfe */
        start local 2 // java.lang.NumberFormatException nfe
         3: .line 87
            new java.lang.IllegalArgumentException
            dup
            aload 2 /* nfe */
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/Throwable;)V
            athrow
        end local 2 // java.lang.NumberFormatException nfe
         4: .line 89
      StackMap locals:
      StackMap stack:
            return
        end local 1 // java.lang.String errorCode
        end local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    5     0       this  Lorg/apache/tomcat/util/descriptor/web/ErrorPage;
            0    5     1  errorCode  Ljava/lang/String;
            3    4     2        nfe  Ljava/lang/NumberFormatException;
      Exception table:
        from    to  target  type
           0     1       2  Class java.lang.NumberFormatException
    MethodParameters:
           Name  Flags
      errorCode  

  public java.lang.String getExceptionType();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
         0: .line 96
            aload 0 /* this */
            getfield org.apache.tomcat.util.descriptor.web.ErrorPage.exceptionType:Ljava/lang/String;
            areturn
        end local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/tomcat/util/descriptor/web/ErrorPage;

  public void setExceptionType(java.lang.String);
    descriptor: (Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
        start local 1 // java.lang.String exceptionType
         0: .line 106
            aload 0 /* this */
            aload 1 /* exceptionType */
            putfield org.apache.tomcat.util.descriptor.web.ErrorPage.exceptionType:Ljava/lang/String;
         1: .line 107
            return
        end local 1 // java.lang.String exceptionType
        end local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    2     0           this  Lorg/apache/tomcat/util/descriptor/web/ErrorPage;
            0    2     1  exceptionType  Ljava/lang/String;
    MethodParameters:
               Name  Flags
      exceptionType  

  public java.lang.String getLocation();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
         0: .line 114
            aload 0 /* this */
            getfield org.apache.tomcat.util.descriptor.web.ErrorPage.location:Ljava/lang/String;
            areturn
        end local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/tomcat/util/descriptor/web/ErrorPage;

  public void setLocation(java.lang.String);
    descriptor: (Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
        start local 1 // java.lang.String location
         0: .line 128
            aload 0 /* this */
            aload 1 /* location */
            invokestatic org.apache.tomcat.util.buf.UDecoder.URLDecode:(Ljava/lang/String;)Ljava/lang/String;
            putfield org.apache.tomcat.util.descriptor.web.ErrorPage.location:Ljava/lang/String;
         1: .line 130
            return
        end local 1 // java.lang.String location
        end local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0    2     0      this  Lorg/apache/tomcat/util/descriptor/web/ErrorPage;
            0    2     1  location  Ljava/lang/String;
    MethodParameters:
          Name  Flags
      location  

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=2, args_size=1
        start local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
         0: .line 141
            new java.lang.StringBuilder
            dup
            ldc "ErrorPage["
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            astore 1 /* sb */
        start local 1 // java.lang.StringBuilder sb
         1: .line 142
            aload 0 /* this */
            getfield org.apache.tomcat.util.descriptor.web.ErrorPage.exceptionType:Ljava/lang/String;
            ifnonnull 5
         2: .line 143
            aload 1 /* sb */
            ldc "errorCode="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         3: .line 144
            aload 1 /* sb */
            aload 0 /* this */
            getfield org.apache.tomcat.util.descriptor.web.ErrorPage.errorCode:I
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            pop
         4: .line 145
            goto 7
         5: .line 146
      StackMap locals: java.lang.StringBuilder
      StackMap stack:
            aload 1 /* sb */
            ldc "exceptionType="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         6: .line 147
            aload 1 /* sb */
            aload 0 /* this */
            getfield org.apache.tomcat.util.descriptor.web.ErrorPage.exceptionType:Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         7: .line 149
      StackMap locals:
      StackMap stack:
            aload 1 /* sb */
            ldc ", location="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         8: .line 150
            aload 1 /* sb */
            aload 0 /* this */
            getfield org.apache.tomcat.util.descriptor.web.ErrorPage.location:Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
         9: .line 151
            aload 1 /* sb */
            ldc "]"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            pop
        10: .line 152
            aload 1 /* sb */
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            areturn
        end local 1 // java.lang.StringBuilder sb
        end local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   11     0  this  Lorg/apache/tomcat/util/descriptor/web/ErrorPage;
            1   11     1    sb  Ljava/lang/StringBuilder;

  public java.lang.String getName();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
         0: .line 156
            aload 0 /* this */
            getfield org.apache.tomcat.util.descriptor.web.ErrorPage.exceptionType:Ljava/lang/String;
            ifnonnull 2
         1: .line 157
            aload 0 /* this */
            getfield org.apache.tomcat.util.descriptor.web.ErrorPage.errorCode:I
            invokestatic java.lang.Integer.toString:(I)Ljava/lang/String;
            areturn
         2: .line 159
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield org.apache.tomcat.util.descriptor.web.ErrorPage.exceptionType:Ljava/lang/String;
            areturn
        end local 0 // org.apache.tomcat.util.descriptor.web.ErrorPage this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/apache/tomcat/util/descriptor/web/ErrorPage;
}
SourceFile: "ErrorPage.java"