http://xml.apache.org/commons/components/external/: xml-commons provides an Apache-hosted set of DOM, SAX, and JAXP interfaces for use in other xml-based projects. Our hope is that we can standardize on both a common version and packaging scheme for these critical XML standards interfaces to make the lives of both our developers and users easier. The External Components portion of xml-commons contains interfaces that are defined by external standards organizations. For DOM, that's the W3C; for SAX it's David Megginson and sax.sourceforge.net; for JAXP it's Sun. 
public class org.xml.sax.SAXException extends java.lang.Exception
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.xml.sax.SAXException
  super_class: java.lang.Exception
{
  private java.lang.Exception exception;
    descriptor: Ljava/lang/Exception;
    flags: (0x0002) ACC_PRIVATE

  static final long serialVersionUID;
    descriptor: J
    flags: (0x0018) ACC_STATIC, ACC_FINAL
    ConstantValue: 583241635256073760

  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // org.xml.sax.SAXException this
         0: .line 45
            aload 0 /* this */
            invokespecial java.lang.Exception.<init>:()V
         1: .line 46
            aload 0 /* this */
            aconst_null
            putfield org.xml.sax.SAXException.exception:Ljava/lang/Exception;
         2: .line 47
            return
        end local 0 // org.xml.sax.SAXException this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/xml/sax/SAXException;

  public void <init>(java.lang.String);
    descriptor: (Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.xml.sax.SAXException this
        start local 1 // java.lang.String message
         0: .line 56
            aload 0 /* this */
            aload 1 /* message */
            invokespecial java.lang.Exception.<init>:(Ljava/lang/String;)V
         1: .line 57
            aload 0 /* this */
            aconst_null
            putfield org.xml.sax.SAXException.exception:Ljava/lang/Exception;
         2: .line 58
            return
        end local 1 // java.lang.String message
        end local 0 // org.xml.sax.SAXException this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lorg/xml/sax/SAXException;
            0    3     1  message  Ljava/lang/String;
    MethodParameters:
         Name  Flags
      message  

  public void <init>(java.lang.Exception);
    descriptor: (Ljava/lang/Exception;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.xml.sax.SAXException this
        start local 1 // java.lang.Exception e
         0: .line 72
            aload 0 /* this */
            invokespecial java.lang.Exception.<init>:()V
         1: .line 73
            aload 0 /* this */
            aload 1 /* e */
            putfield org.xml.sax.SAXException.exception:Ljava/lang/Exception;
         2: .line 74
            return
        end local 1 // java.lang.Exception e
        end local 0 // org.xml.sax.SAXException this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/xml/sax/SAXException;
            0    3     1     e  Ljava/lang/Exception;
    MethodParameters:
      Name  Flags
      e     

  public void <init>(java.lang.String, java.lang.Exception);
    descriptor: (Ljava/lang/String;Ljava/lang/Exception;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // org.xml.sax.SAXException this
        start local 1 // java.lang.String message
        start local 2 // java.lang.Exception e
         0: .line 88
            aload 0 /* this */
            aload 1 /* message */
            invokespecial java.lang.Exception.<init>:(Ljava/lang/String;)V
         1: .line 89
            aload 0 /* this */
            aload 2 /* e */
            putfield org.xml.sax.SAXException.exception:Ljava/lang/Exception;
         2: .line 90
            return
        end local 2 // java.lang.Exception e
        end local 1 // java.lang.String message
        end local 0 // org.xml.sax.SAXException this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lorg/xml/sax/SAXException;
            0    3     1  message  Ljava/lang/String;
            0    3     2        e  Ljava/lang/Exception;
    MethodParameters:
         Name  Flags
      message  
      e        

  public java.lang.String getMessage();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=1
        start local 0 // org.xml.sax.SAXException this
         0: .line 104
            aload 0 /* this */
            invokespecial java.lang.Exception.getMessage:()Ljava/lang/String;
            astore 1 /* message */
        start local 1 // java.lang.String message
         1: .line 106
            aload 1 /* message */
            ifnonnull 3
            aload 0 /* this */
            getfield org.xml.sax.SAXException.exception:Ljava/lang/Exception;
            ifnull 3
         2: .line 107
            aload 0 /* this */
            getfield org.xml.sax.SAXException.exception:Ljava/lang/Exception;
            invokevirtual java.lang.Exception.getMessage:()Ljava/lang/String;
            areturn
         3: .line 109
      StackMap locals: java.lang.String
      StackMap stack:
            aload 1 /* message */
            areturn
        end local 1 // java.lang.String message
        end local 0 // org.xml.sax.SAXException this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    4     0     this  Lorg/xml/sax/SAXException;
            1    4     1  message  Ljava/lang/String;

  public java.lang.Exception getException();
    descriptor: ()Ljava/lang/Exception;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.xml.sax.SAXException this
         0: .line 121
            aload 0 /* this */
            getfield org.xml.sax.SAXException.exception:Ljava/lang/Exception;
            areturn
        end local 0 // org.xml.sax.SAXException this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/xml/sax/SAXException;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.xml.sax.SAXException this
         0: .line 132
            aload 0 /* this */
            getfield org.xml.sax.SAXException.exception:Ljava/lang/Exception;
            ifnull 2
         1: .line 133
            aload 0 /* this */
            getfield org.xml.sax.SAXException.exception:Ljava/lang/Exception;
            invokevirtual java.lang.Exception.toString:()Ljava/lang/String;
            areturn
         2: .line 135
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            invokespecial java.lang.Exception.toString:()Ljava/lang/String;
            areturn
        end local 0 // org.xml.sax.SAXException this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lorg/xml/sax/SAXException;
}
SourceFile: "SAXException.java"