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Head First Servlet : Beer Version 2 Problem  RSS feed

 
Greenhorn
Posts: 13
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Hello Guys,

I don't where I'm going wrong in this problem. Below are details:

Below is my BeerExpert.java file which is stored at src/com/example/model



When I compile this file , it gets compile successfully
C:\Beer-V2>javac -d src\com\example\model BeerExpert.java

and create the .class file correctly in the directory classes/com/example/model

But ,when I try to compile BeerSelect.java (Which is at src\com\example\web), which is as below


It tells me that it can't find the package com.example.model as below

C:\MyProject\Beer-V2>javac -classpath "c:\Tomcat 6.0\lib\servlet-api.jar" -d classes src\com\example\web\BeerSelect.java
src\com\example\web\BeerSelect.java:3: package com.example.model does not exist
import com.example.model.*;
^
src\com\example\web\BeerSelect.java:15: cannot find symbol
symbol : class BeerExpert
location: class com.example.web.BeerSelect
BeerExpert be=new BeerExpert();
^
src\com\example\web\BeerSelect.java:15: cannot find symbol
symbol : class BeerExpert
location: class com.example.web.BeerSelect
BeerExpert be=new BeerExpert();
^
3 errors

C:\MyProject\Beer-V2>

Thanks in advance
 
Ranch Hand
Posts: 1512
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This is a classpath issue. Make sure your development directory is in your classpath. i.e the directory above com/example/model
 
Asad Salim
Greenhorn
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Classpath issue , I m sorry , but i m not able to understand the issue . Since , I m running it from my Development environment folder itself i.e. Beer-v2

Below is my Development Directory structure

c:\>MyProject\Beer-V2> (I m executing the above command from here)

Under Beer-V2 , I have the below folders
src
(BeerExpert.java is located at src\com\example\model)
(BeerSelect.java is located at src\com\example\web)

classes
(BeerExpert.java is located at classes\com\example\model)
BeerSelect.java is not created , as the compilation fails at the below instance

C:\MyProject\Beer-V2>javac -classpath "c:\Tomcat 6.0\lib\servlet-api.jar" -d cla
sses src\com\example\web\BeerSelect.java
src\com\example\web\BeerSelect.java:3: package com.example.model does not exist
import com.example.model.*;
^
src\com\example\web\BeerSelect.java:15: cannot find symbol
symbol : class BeerExpert
location: class com.example.web.BeerSelect
BeerExpert be=new BeerExpert();
^
src\com\example\web\BeerSelect.java:15: cannot find symbol
symbol : class BeerExpert
location: class com.example.web.BeerSelect
BeerExpert be=new BeerExpert();
^
3 errors
 
Asad Salim
Greenhorn
Posts: 13
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Thanks Bosun Bello , I could figure the problem and could resolve it.
 
Bosun Bello
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No problem. You can post back exactly what you did, so that others that run into similar issues can see it.
 
Asad Salim
Greenhorn
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C:\MyProject\Beer-V2>javac -classpath "c:\Tomcat 6.0\lib\servlet-api.jar";"c:\MyProject\Beer-V2\src" -d classes src\com\example\web\BeerSelect.java

Solved the issue.
 
Marshal
Posts: 59769
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Check whether the code in the book and the code from the website it identical. There may be package names added to the website version.
 
Greenhorn
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(BeerExpert.java is located at classes\com\example\model)
BeerSelect.java is not created , as the compilation fails at the below instance

C:\MyProject\Beer-V2>javac -classpath "c:\Tomcat 6.0\lib\servlet-api.jar" -d cla
sses src\com\example\web\BeerSelect.java
src\com\example\web\BeerSelect.java:3: package com.example.model does not exist
import com.example.model.*;
^
src\com\example\web\BeerSelect.java:15: cannot find symbol
symbol : class BeerExpert
location: class com.example.web.BeerSelect
BeerExpert be=new BeerExpert();
^
src\com\example\web\BeerSelect.java:15: cannot find symbol
symbol : class BeerExpert
location: class com.example.web.BeerSelect
BeerExpert be=new BeerExpert();
^
3 errors

why can't my environment variable do this work without below line ....


C:\MyProject\Beer-V2>javac -classpath "c:\Tomcat 6.0\lib\servlet-api.jar";"c:\MyProject\Beer-V2\src" -d classes src\com\example\web\BeerSelect.java
 
It is sorta covered in the JavaRanch Style Guide.
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