The application was developed under Tomcat on a Linux server. MySQL was used as the 
database. The system will also be deployed under the same software components due to the 
low expected load of the application, and the financial limitations that apply to public institutions. 
4.1.2 Overall Architecture 
The Permit System consists of three layers: 
   The user interface, which was implemented using Sun's JavaServer Pages (JSP) 
technology. For presentation, both JSP and servlets are used. 
   The business logic, which consists of a package of Java classes.  
   The database layer, which consists of a set of tables in a MySQL database. 
S tr e e t  O p e n in g   P e r m it   S y s te m
  P r e s e n t a t io n   L a ye r  
B u s in e s s   L a ye r
D a t a b a s e   L a y e r
U s e r  In t e r f a c e
  S e r v le ts
Ja v a   C la s s e s
M y S Q L   D a ta b a s e
    JS P   P a g e s
B r o w s e r
Figure 9: Permit System Architecture 
The first step in developing the Permit System architecture was the design of the database by 
capturing the requirements as attributes and tables in a relational system. Then, an initial 
prototype of the user interface was created that consisted of HTML mock up pages. The Java 
classes comprising the business logic were then developed closely based on the database 
tables and the HTML pages. 
During the architectural process, a strong emphasis was placed on the consistency of the three 
layers. Fields of forms that were developed needed to have a corresponding attribute in a 
database table, and vice versa. Furthermore, a file name, attribute, and variable naming 
convention spanning all three layers was introduced to avoid confusion and to make the names 
easier to memorize. 
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