https://tomcat.apache.org/: Tomcat Connectors and HTTP parser 
public class org.apache.tomcat.util.http.fileupload.impl.FileUploadIOException extends java.io.IOException
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: org.apache.tomcat.util.http.fileupload.impl.FileUploadIOException
  super_class: java.io.IOException
{
  private static final long serialVersionUID;
    descriptor: J
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: -7047616958165584154

  private final org.apache.tomcat.util.http.fileupload.FileUploadException cause;
    descriptor: Lorg/apache/tomcat/util/http/fileupload/FileUploadException;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>(org.apache.tomcat.util.http.fileupload.FileUploadException);
    descriptor: (Lorg/apache/tomcat/util/http/fileupload/FileUploadException;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // org.apache.tomcat.util.http.fileupload.impl.FileUploadIOException this
        start local 1 // org.apache.tomcat.util.http.fileupload.FileUploadException pCause
         0: .line 47
            aload 0 /* this */
            invokespecial java.io.IOException.<init>:()V
         1: .line 49
            aload 0 /* this */
            aload 1 /* pCause */
            putfield org.apache.tomcat.util.http.fileupload.impl.FileUploadIOException.cause:Lorg/apache/tomcat/util/http/fileupload/FileUploadException;
         2: .line 50
            return
        end local 1 // org.apache.tomcat.util.http.fileupload.FileUploadException pCause
        end local 0 // org.apache.tomcat.util.http.fileupload.impl.FileUploadIOException this
      LocalVariableTable:
        Start  End  Slot    Name  Signature
            0    3     0    this  Lorg/apache/tomcat/util/http/fileupload/impl/FileUploadIOException;
            0    3     1  pCause  Lorg/apache/tomcat/util/http/fileupload/FileUploadException;
    MethodParameters:
        Name  Flags
      pCause  

  public java.lang.Throwable getCause();
    descriptor: ()Ljava/lang/Throwable;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.apache.tomcat.util.http.fileupload.impl.FileUploadIOException this
         0: .line 60
            aload 0 /* this */
            getfield org.apache.tomcat.util.http.fileupload.impl.FileUploadIOException.cause:Lorg/apache/tomcat/util/http/fileupload/FileUploadException;
            areturn
        end local 0 // org.apache.tomcat.util.http.fileupload.impl.FileUploadIOException this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/apache/tomcat/util/http/fileupload/impl/FileUploadIOException;
}
SourceFile: "FileUploadIOException.java"