Still working on the WebObjects, WOlips and Wonder tutorial, part 2...
Getting a null pointer exception. I've spent hours trying to figure out the
issue, but I just don't have the experience to properly trouble shoot it. The
stack trace is below, and below that is the code for my DirectAction. The
console says the error occurs on line 55, which is "if (errorMessage != null ||
errorMessage.length() != 0) { "
The thing is, errorMessage is null at this point. I've entered in valid user
credentials, the session object has been created. The currentUser and nextPage
objects are not null. nextPage is set to "AdminPage". As soon as I try to
step into the "if (errorMessage != null || errorMessage.length() != 0) {"
line the exception occurs. Is this a scope issue?
Thanks.
Application: SooperSeekrit Error: java.lang.NullPointerException Reason: Stack
trace:
File Line# Method Package
DirectAction.java 55 loginAction com.sooperseekrit.app
NativeMethodAccessorImpl.java NA invoke0 sun.reflect
NativeMethodAccessorImpl.java 39 invoke sun.reflect
DelegatingMethodAccessorImpl.java 25 invoke sun.reflect
Method.java 597 invoke java.lang.reflect
WODirectAction.java 144 performActionNamed com.webobjects.appserver
ERXDirectAction.java 401 performActionNamed er.extensions.appserver
WOActionRequestHandler.java 259 _handleRequest
com.webobjects.appserver._private
WOActionRequestHandler.java 158 handleRequest
com.webobjects.appserver._private
ERXDirectActionRequestHandler.java 126 handleRequest
er.extensions.appserver
WOApplication.java 1687 dispatchRequest com.webobjects.appserver
ERXApplication.java 2021 dispatchRequestImmediately
er.extensions.appserver
ERXApplication.java 1986 dispatchRequest er.extensions.appserver
WOWorkerThread.java 144 runOnce com.webobjects.appserver._private
WOWorkerThread.java 226 run com.webobjects.appserver._private
Thread.java 680 run java.lang
package com.sooperseekrit.app;
import java.util.NoSuchElementException;
import com.webobjects.appserver.WOActionResults;
import com.webobjects.appserver.WOComponent;
import com.webobjects.appserver.WORequest;
import com.webobjects.eocontrol.EOQualifier;
import er.extensions.appserver.ERXDirectAction;
import er.extensions.eof.ERXEC;
import com.sooperseekrit.components.AdminPage;
import com.sooperseekrit.components.Main;
import com.sooperseekrit.components.UserPage;
import com.sooperseekrit.model.User;
public class DirectAction extends ERXDirectAction {
public DirectAction(WORequest request) {
super(request);
}
@Override
public WOActionResults defaultAction() {
return pageWithName(Main.class.getName());
}
public WOActionResults loginAction() {
WOComponent nextPage = null;
String username = request().stringFormValueForKey("username");
String password = request().stringFormValueForKey("password");
String errorMessage = null;
if (username == null || username.length() == 0 ||
password == null || password.length() == 0) {
errorMessage = "Please enter a username and password";
} else {
try {
EOQualifier qual =
User.USERNAME.eq(username).and(User.PASSWORD.eq(password));
User user =
User.fetchRequiredUser(ERXEC.newEditingContext(), qual);
((Session)session()).set_currentUser(user);
if (user.group().name().equals("Admin")) {
nextPage =
pageWithName(AdminPage.class.getName());
} else if (user.group().name().equals("User")) {
nextPage =
pageWithName(UserPage.class.getName());
}
} catch (NoSuchElementException e) {
errorMessage = "No user found for those
credentials";
} catch (Exception e) {
// something bad happened
}
}
if (errorMessage != null || errorMessage.length() != 0) {
nextPage = pageWithName(Main.class.getName());
nextPage.takeValueForKey(errorMessage, "errorMessage");
nextPage.takeValueForKey(username, "username");
nextPage.takeValueForKey(password, "password");
}
return nextPage;
}
}
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