1
继this solution我犯了一个错误页面是这样的:错误处理页面/ Facelets的
faces-config.xml中
<error-page>
<error-code>500</error-code>
<location>/errore500.xhtml</location>
</error-page>
....
<managed-bean>
<managed-bean-name>errore</managed-bean-name>
<managed-bean-class>it.jlp.prometheus.modello.Errore</managed-bean-class>
<managed-bean-scope>request</managed-bean-scope>
</managed-bean>
...页面errore500.xhtml。 ..
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="it"
xmlns:ui="http://java.sun.com/jsf/facelets"
xmlns:h="http://java.sun.com/jsf/html">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8"/>
<meta name="author" content="JLP" />
<link rel="stylesheet" href="css/stile.css" type="text/css" />
<link rel="icon" href="icons/favicon.png" type="image/png" />
<title>Prometheus - Error 500</title>
</head>
<body>
<h:form>
....
<br/><h:inputTextarea style="width: 100%;" rows="20" readonly="true"
value="#{errore.stackTrace}" />
....
...和类Errore
public class Errore implements Serializable {
private Log logger = LogFactory.getLog(Errore.class);
public String getStackTrace() {
FacesContext context = FacesContext.getCurrentInstance();
Map requestMap = context.getExternalContext().getRequestMap();
Throwable ex = (Throwable) requestMap.get("javax.servlet.error.exception");
StringWriter writer = new StringWriter();
PrintWriter pw = new PrintWriter(writer);
fillStackTrace(ex, pw);
logger.info("****** getStackTrace executed ");
return writer.toString();
}
private void fillStackTrace(Throwable ex, PrintWriter pw) {
if (null == ex) {
return;
}
ex.printStackTrace(pw);
if (ex instanceof ServletException) {
Throwable cause = ((ServletException) ex).getRootCause();
if (null != cause) {
pw.println("Root Cause:");
fillStackTrace(cause, pw);
}
} else {
Throwable cause = ex.getCause();
if (null != cause) {
pw.println("Cause:");
fillStackTrace(cause, pw);
}
}
}
有了这段代码,当我在应用程序的另一部分中故意引发一个错误(一个ClassCastException)时,它将我重定向到这个页面,但是通过将一个调试打印日志放在backing bean类中,我发现它从未实例化过,因此文本区域不会被填充。 为什么后台bean从未实例化?
我已经在web.xml这片配置: \t'<上下文-param> javax.faces.DEFAULT_SUFFIX .xhtml param-value> context-param> ... 面临的Servlet servlet的名称> javax.faces.webapp.FacesServlet servlet的类> <负载上启动> 1负载上启动> 面临的Servlet servlet的名称> * .faces URL模式> servlet的映射>' 我应该用errore500.faces更改位置吗? –
JLPicard
2011-05-26 08:23:15
是的,FacesServlet的URL模式。 – BalusC 2011-05-26 10:51:01
对不起,但没有奏效。可能是别的东西?也许面临配置的东西? – JLPicard 2011-05-27 11:37:04