Error While Execution in Cmd prompt
<p>i have a java code for send a mail while i am executing the following error is shown</p>

<pre><code>.\SendEmail.java:5: package javax.mail.Message does not exist
import javax.mail.Message.RecipientType;
                         ^
.\SendEmail.java:6: package javax.mail.internet does not exist
import javax.mail.internet.AddressException;
                          ^
.\SendEmail.java:7: package javax.mail.internet does not exist
import javax.mail.internet.InternetAddress;
                          ^
.\SendEmail.java:8: package javax.mail.internet does not exist
import javax.mail.internet.MimeMessage;
</code></pre>

<p>and the another java class for write some values in database, in that the following error will show </p>

<pre><code>                           ^
.\WriteHelper.java:34: cannot find symbol
symbol  : class WorkbookSettings
location: class WriteHelper
                WorkbookSettings wbSettings = new WorkbookSettings();
                ^
.\WriteHelper.java:34: cannot find symbol
symbol  : class WorkbookSettings
location: class WriteHelper
                WorkbookSettings wbSettings = new WorkbookSettings();
                                                  ^
.\WriteHelper.java:38: cannot find symbol
symbol  : class WritableWorkbook
location: class WriteHelper
                WritableWorkbook workbook = Workbook.createWorkbook(file, wbSett
ings);
                ^
.\WriteHelper.java:38: cannot find symbol
symbol  : variable Workbook
location: class WriteHelper
                WritableWorkbook workbook = Workbook.createWorkbook(file, wbSett
ings);
                                            ^
.\WriteHelper.java:40: cannot find symbol
symbol  : class WritableSheet
location: class WriteHelper
                WritableSheet excelSheet = workbook.getSheet(0);
                ^
.\WriteHelper.java:51: cannot find symbol
symbol  : class WritableFont
location: class WriteHelper
                WritableFont times10pt = new WritableFont(WritableFont.TIMES, 10
);
                ^
.\WriteHelper.java:51: cannot find symbol
symbol  : class WritableFont
location: class WriteHelper
                WritableFont times10pt = new WritableFont(WritableFont.TIMES, 10
);
                                             ^
.\WriteHelper.java:51: cannot find symbol
symbol  : variable WritableFont
location: class WriteHelper
                WritableFont times10pt = new WritableFont(WritableFont.TIMES, 10
);
                                                          ^
.\WriteHelper.java:53: cannot find symbol
symbol  : class WritableCellFormat
location: class WriteHelper
                times = new WritableCellFormat(times10pt);
                            ^
.\WriteHelper.java:58: cannot find symbol
symbol  : class WritableFont
location: class WriteHelper
                WritableFont times10ptBoldUnderline = new WritableFont(
                ^
.\WriteHelper.java:58: cannot find symbol
symbol  : class WritableFont
location: class WriteHelper
                WritableFont times10ptBoldUnderline = new WritableFont(
                                                          ^
.\WriteHelper.java:59: cannot find symbol
symbol  : variable WritableFont
location: class WriteHelper
                                WritableFont.TIMES, 10, WritableFont.BOLD, false
,
                                ^
.\WriteHelper.java:59: cannot find symbol
symbol  : variable WritableFont
location: class WriteHelper
                                WritableFont.TIMES, 10, WritableFont.BOLD, false
,
                                                        ^
.\WriteHelper.java:60: cannot find symbol
symbol  : variable UnderlineStyle
location: class WriteHelper
                                UnderlineStyle.SINGLE);
                                ^
.\WriteHelper.java:61: cannot find symbol
symbol  : class WritableCellFormat
location: class WriteHelper
                timesBoldUnderline = new WritableCellFormat(times10ptBoldUnderli
ne);
                                         ^
.\WriteHelper.java:65: cannot find symbol
symbol  : class CellView
location: class WriteHelper
                CellView cv = new CellView();
                ^
.\WriteHelper.java:65: cannot find symbol
symbol  : class CellView
location: class WriteHelper
                CellView cv = new CellView();
                                  ^
.\WriteHelper.java:90: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label=new Label(j,k,JavaSamp.date.get(z),timesBold
Underline);
                        ^
.\WriteHelper.java:90: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label=new Label(j,k,JavaSamp.date.get(z),timesBold
Underline);
                                        ^
.\WriteHelper.java:92: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label1=new Label(m,k,JavaSamp.motherboard.get(z),t
imesBoldUnderline);
                        ^
.\WriteHelper.java:92: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label1=new Label(m,k,JavaSamp.motherboard.get(z),t
imesBoldUnderline);
                                         ^
.\WriteHelper.java:94: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label2=new Label(p,k,JavaSamp.processorid.get(z),t
imesBoldUnderline);
                        ^
.\WriteHelper.java:94: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label2=new Label(p,k,JavaSamp.processorid.get(z),t
imesBoldUnderline);
                                         ^
.\WriteHelper.java:96: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label3=new Label(pn,k,JavaSamp.processorname.get(z
),timesBoldUnderline);
                        ^
.\WriteHelper.java:96: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label3=new Label(pn,k,JavaSamp.processorname.get(z
),timesBoldUnderline);
                                         ^
.\WriteHelper.java:98: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label4=new Label(bn,k,JavaSamp.biosname.get(z),tim
esBoldUnderline);
                        ^
.\WriteHelper.java:98: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label4=new Label(bn,k,JavaSamp.biosname.get(z),tim
esBoldUnderline);
                                         ^
.\WriteHelper.java:100: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label5=new Label(bid,k,JavaSamp.biosid.get(z),time
sBoldUnderline);
                        ^
.\WriteHelper.java:100: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label5=new Label(bid,k,JavaSamp.biosid.get(z),time
sBoldUnderline);
                                         ^
.\WriteHelper.java:102: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label6=new Label(bman,k,JavaSamp.biosname.get(z),t
imesBoldUnderline);
                        ^
.\WriteHelper.java:102: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label6=new Label(bman,k,JavaSamp.biosname.get(z),t
imesBoldUnderline);
                                         ^
.\WriteHelper.java:104: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label7=new Label(cval,k,JavaSamp.install_countlist
.get(z),timesBoldUnderline);
                        ^
.\WriteHelper.java:104: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label7=new Label(cval,k,JavaSamp.install_countlist
.get(z),timesBoldUnderline);
                                         ^
.\WriteHelper.java:106: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label8=new Label(8,k,JavaSamp.maxval,timesBoldUnde
rline);
                        ^
.\WriteHelper.java:106: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label8=new Label(8,k,JavaSamp.maxval,timesBoldUnde
rline);
                                         ^
.\WriteHelper.java:108: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label9=new Label(9,k,JavaSamp.maxsysval,timesBoldU
nderline);
                        ^
.\WriteHelper.java:108: cannot find symbol
symbol  : class Label
location: class WriteHelper
                        Label label9=new Label(9,k,JavaSamp.maxsysval,timesBoldU
nderline);
                                         ^
.\WriteHelper.java:117: cannot find symbol
symbol  : class Label
location: class WriteHelper
                Label label;
                ^
.\WriteHelper.java:118: cannot find symbol
symbol  : class Label
location: class WriteHelper
                label = new Label(column, row, s, timesBoldUnderline);
</code></pre>

<p>Why this type of errors are araise if any possibility to overcome it</p>
