Kevin
This is a java or may be even programming issue, NOT a WebObjects one.
Because of the || or operator, the runtime has to evaluate the second portion
of the condition. Since errorMessage is null, length() of errorMessage will
throw the exception...
Paul
Sent from my iPad
On Dec 4, 2011, at 3:22 AM, Philippe Rabier <prab...@me.com> wrote:
> Hi Kevin
>
> You have to use a && operator when you test if your string is not null and
> length > 0. ;-)
>
> Bad copy/paste I guess.
>
> Your code is clean.
>
> Philippe
>
> Sent from my iPhone
>
> On 4 déc. 2011, at 09:01, Kevin Spake <sparky0...@yahoo.com> wrote:
>
>> 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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