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View Full Version : [JSP] Altro errore, stavolta nell'uso di 1 bean!

Matrixbob
08-06-2005, 14:03
Che balle siamo alle solite ...
Generated servlet error:
Rotator cannot be resolved or is not a type.

HTTP Status 500 -
--------------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: Unable to compile class for JSP

An error occurred at line: 4 in the jsp file: /AdRotator.jsp
Generated servlet error:
Rotator cannot be resolved or is not a type

An error occurred at line: 4 in the jsp file: /AdRotator.jsp
Generated servlet error:
Rotator cannot be resolved or is not a type

An error occurred at line: 4 in the jsp file: /AdRotator.jsp
Generated servlet error:
Rotator cannot be resolved or is not a type

An error occurred at line: 27 in the jsp file: /AdRotator.jsp
Generated servlet error:
Rotator cannot be resolved or is not a type

An error occurred at line: 30 in the jsp file: /AdRotator.jsp
Generated servlet error:
Rotator cannot be resolved or is not a type


org.apache.jasper.compiler.DefaultErrorHandler.javacError(DefaultErrorHandler.java:84)
org.apache.jasper.compiler.ErrorDispatcher.javacError(ErrorDispatcher.java:328)
org.apache.jasper.compiler.JDTCompiler.generateClass(JDTCompiler.java:397)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:288)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:556)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)

note The full stack trace of the root cause is available in the Apache Tomcat/5.5.9 logs.
Matrixbob
08-06-2005, 14:03
Il file.jsp è questo:

<?xml version = "1.0"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">

<jsp:useBean id = "rotator" scope = "application" class = "Rotator" />

<html xmlns = "http://www.w3.org/1999/xhtml">

<head>

<title>AdRotator Example</title>

<style type = "text/css">
.big { font-family: helvetica, arial, sans-serif;
font-weight: bold;
font-size: 2em }
</style>

<% rotator.nextAd(); %>

</head>

<body>

<p class = "big">AdRotator Example</p>

<p>
<a href = "<jsp:getProperty name = "rotator"
property = "link" />">

<img src = "<jsp:getProperty name = "rotator"
property = "image" />" alt = "advertisement" />
</a>
</p>

</body>

</html>
Matrixbob
08-06-2005, 14:06
Questo dovrebbe essere il bean.java:

public class Rotator
{

private String images[] = { "images/jhtp3.jpg",
"images/xmlhtp1.jpg", "images/ebechtp1.jpg",
"images/iw3htp1.jpg", "images/cpphtp3.jpg" };

private String links[] = {
"http://www.amazon.com/exec/obidos/ASIN/0130125075/" +
"deitelassociatin",
"http://www.amazon.com/exec/obidos/ASIN/0130284173/" +
"deitelassociatin",
"http://www.amazon.com/exec/obidos/ASIN/013028419X/" +
"deitelassociatin",
"http://www.amazon.com/exec/obidos/ASIN/0130161438/" +
"deitelassociatin",
"http://www.amazon.com/exec/obidos/ASIN/0130895717/" +
"deitelassociatin" };

private int selectedIndex = 0;

// returns image file name for current ad
public String getImage()
{
return images[ selectedIndex ];
}

// returns the URL for ad's corresponding Web site
public String getLink()
{
return links[ selectedIndex ];
}

// update selectedIndex so next calls to getImage and
// getLink return a different advertisement
public void nextAd()
{
selectedIndex = ( selectedIndex + 1 ) % images.length;
}

}
Matrixbob
08-06-2005, 14:15
Ok adesso creando un package mi da quest'altro, ma mia pre un passo avanti:

HTTP Status 500 -
--------------------------------------------------------------------------------

type Exception report

message

description The server encountered an internal error () that prevented it from fulfilling this request.

exception

org.apache.jasper.JasperException: /AdRotator.jsp(4,0) The value for the useBean class attribute Rotator is invalid.
org.apache.jasper.compiler.DefaultErrorHandler.jspError(DefaultErrorHandler.java:39)
org.apache.jasper.compiler.ErrorDispatcher.dispatch(ErrorDispatcher.java:405)
org.apache.jasper.compiler.ErrorDispatcher.jspError(ErrorDispatcher.java:146)
org.apache.jasper.compiler.Generator$GenerateVisitor.visit(Generator.java:1223)
org.apache.jasper.compiler.Node$UseBean.accept(Node.java:1116)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Node$Visitor.visitBody(Node.java:2213)
org.apache.jasper.compiler.Node$Visitor.visit(Node.java:2219)
org.apache.jasper.compiler.Node$Root.accept(Node.java:456)
org.apache.jasper.compiler.Node$Nodes.visit(Node.java:2163)
org.apache.jasper.compiler.Generator.generate(Generator.java:3270)
org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:189)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:286)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:267)
org.apache.jasper.compiler.Compiler.compile(Compiler.java:255)
org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:556)
org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:293)
org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:291)
org.apache.jasper.servlet.JspServlet.service(JspServlet.java:241)
javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note The full stack trace of the root cause is available in the Apache Tomcat/5.5.9 logs.
Matrixbob
08-06-2005, 14:19
Funziona, si ma che stress ho dovuto modificare in questo modo:
<jsp:useBean id = "rotator" scope = "application" class = "bean.Rotator" />

il file.jsp.

Qui ogni cosa va fatta in un modo diverso.
Sono distrutto!! :(
kingv
08-06-2005, 14:21
metti il package anche nell'attributo class di useBean



edit: non avevo visto che avessi già risolto. ma i post li fai in tempo mentre lavori? aspetta di avere qualcosa che non riesci a risolvere prima di postare :fagiano:
Matrixbob
08-06-2005, 14:28
metti il package anche nell'attributo class di useBean



edit: non avevo visto che avessi già risolto. ma i post li fai in tempo mentre lavori? aspetta di avere qualcosa che non riesci a risolvere prima di postare :fagiano:
Si, praticametne si.
Ma tanto li includo come link d'esempio al [Tutorial], non ho voglia di riordinarli apposta, quindi li linko.