AppPerfect

JSP Code

Rules available in this category:

  1. Avoid_duplicate_JSP_local_variable_names
  2. Cyclic_include_of_JSPs
  3. Avoid_duplicate_JSP_field_names
  4. Avoid_duplicate_JSP_imports
  5. Avoid_duplicate_JSP_method_names
  6. Never_use_reserved_JSP_local_variable_names
  7. Always_provide_JSP_headers_comments
Rule 1: Avoid_duplicate_JSP_local_variable_names

Severity:  Critical
Rule:  Avoid duplicate local variable names in JSP. This can happen when other JSPs are included.
Reason:  Avoid duplicate local variable names in JSP. This can happen when other JSPs are included.

Usage Example: 

one.jsp

<%@ include file="two.jsp" %>
<%
 int var = 0;  // VIOLATION
%>


two.jsp

<%
 int var = 0;
%>

Should be written as:


		

Reference: 

Rule 2: Cyclic_include_of_JSPs

Severity:  Critical
Rule:  Detects the infinite loop caused by including JSPs.
Reason:  Detects the infinite loop caused by including JSPs.

Usage Example: 

one.jsp

<%@ include file="two.jsp" %>
...


two.jsp

<%@ include file="three.jsp" %>
...



three.jsp

<%@ include file="one.jsp" %>
...

Should be written as:


		

Reference: 

Rule 3: Avoid_duplicate_JSP_field_names

Severity:  Critical
Rule:  Avoid duplicate field names in JSP. This can happen when other JSPs are included.
Reason:  Avoid duplicate field names in JSP. This can happen when other JSPs are included.

Usage Example: 

one.jsp

<%@ include file="two.jsp" %>
<%!
 int fld = 0;  // VIOLATION
%>


two.jsp

<%!
 int fld = 0;
%>

Should be written as:


		

Reference: 

Rule 4: Avoid_duplicate_JSP_imports

Severity:  High
Rule:  Avoid duplicate imports in JSP.
Reason:  Avoid duplicate imports in JSP.

Usage Example: 

<%@ page import=\"com.foo.MyClass,com.foo.MyClass\"%> // VIOLATION
//...

Should be written as:

<%@ page import=\"com.foo.MyClass\"%> // FIXED
//...

Reference:  Not Available.

Rule 5: Avoid_duplicate_JSP_method_names

Severity:  Critical
Rule:  Avoid duplicate methods in JSP. This can happen when other JSPs are included.
Reason:  Avoid duplicate methods in JSP. This can happen when other JSPs are included.

Usage Example: 

one.jsp

<%@ include file="two.jsp" %>
<%!
 public void foo() // VIOLATION
 {
  ...
 }
%>


two.jsp

<%!
 public void foo() // VIOLATION
 {
  ...
 }
%>

Should be written as:


		

Reference: 

Rule 6: Never_use_reserved_JSP_local_variable_names

Severity:  Critical
Rule:  Never use local variable names used by servelts, since this can result in duplicate variable names.
Reason:  Never use local variable names used by servelts, since this can result in duplicate variable names.

Usage Example: 

one.jsp


<%
int request = -1; //VIOLATION
%>

Should be written as:


		

Reference: 

Rule 7: Always_provide_JSP_headers_comments

Severity:  Medium
Rule:  Never use local variable names used by servelts, since this can result in duplicate variable names.
Reason:  Never use local variable names used by servelts, since this can result in duplicate variable names.

Usage Example: 

<html>
<head>
<title>Notice and Result</title>
</head>
<body topmargin=0>
....
</body>
</html>

Should be written as:

<%-- This JSP displays the login form --%>
<html>
<head>
<title>Notice and Result</title>
</head>
<body topmargin=0>
....
</body>
</html>

Reference: 

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