ErrorPageView.java
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package fi.codecrew.moya.web;
import java.io.PrintWriter;
import java.io.Serializable;
import java.io.StringWriter;
import java.util.Arrays;
import java.util.Map;
import java.util.zip.CRC32;
import javax.enterprise.context.RequestScoped;
import javax.faces.context.FacesContext;
import javax.inject.Inject;
import javax.inject.Named;
import javax.servlet.http.HttpServletRequest;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import fi.codecrew.moya.HostnameFilter;
@Named
@RequestScoped
public class ErrorPageView implements Serializable {
/**
*
*/
private static final long serialVersionUID = 1L;
// private static final long serialVersionUID = -2179309061036632342L;
String trace;
@Inject
private transient FacesContext context;
@SuppressWarnings("unused")
private static final Logger logger = LoggerFactory.getLogger(ErrorPageView.class);
public String getStackTrace() {
FacesContext context = FacesContext.getCurrentInstance();
Map requestMap = context.getExternalContext().getRequestMap();
Throwable ex =
(Throwable) requestMap.get("javax.servlet.error.exception");
StringWriter sw = new StringWriter();
PrintWriter pw = new PrintWriter(sw);
ex.printStackTrace(pw);
trace = sw.toString();
return trace;
}
public String getStackTraceHash() {
FacesContext context = FacesContext.getCurrentInstance();
Map<?, ?> requestMap = context.getExternalContext().getRequestMap();
Throwable ex = (Throwable) requestMap.get("javax.servlet.error.exception");
CRC32 stackHash = new CRC32();
stackHash.update(Arrays.toString(ex.getStackTrace()).getBytes());
return "0x" + Long.toHexString(stackHash.getValue());
}
public String getTime() {
String stamp = "0x" + Long.toHexString(System.currentTimeMillis());
logger.error("Error occured at {} trail {}", stamp, getTrail());
return stamp;
}
public String getTrail() {
HttpServletRequest req = (HttpServletRequest) getContext().getExternalContext().getRequest();
Object trail = req.getSession().getAttribute(HostnameFilter.HTTP_TRAIL_NAME);
return trail != null ? trail.toString() : "";
}
public FacesContext getContext() {
return context;
}
public void setContext(FacesContext context) {
this.context = context;
}
}