I AM LOSING MY F***ING MIND OVER THIS.
For over a year now I've been learning web development using Google Cloud
Platform and studying online resources. I've gone through an excruciating
amount of trial and error over the past year, but no matter what formidable
brick wall I ran into, I always managed to find a solution without making
any new forum posts or asking for help. But this is just killing me.
I am trying to get a basic user login system set up for a basic website.
Right now I am not worrying too much about security, I am just trying to
lay the foundation for a custom user database that I can use for
authorization on this site. For the sake of simplicity and understanding in
the beginning stages of building this auth system, I have based my user
entity creation template on the same template that I'm using for the
creation of posts, albums, and photos, a template found in the Java
Bookshelf App tutorial. My application has no problem creating post, album,
and photo entities, and since my user entity is created with the same exact
template as those entities, I DO NOT UNDERSTAND WHY IT IS NOT WORKING!!!
I am using Datastore on App Engine Java using JSPs and Servlets. My project
is built with Maven, and my local development server is run with Jetty.
*My JSP signup form:*
<form method="POST" action="${destination}" enctype="multipart/form-data">
<div class="form-group">
<label for="email">Email</label>
<input class="form-control" type="text" id="email" name=
"email" placeholder="Email"/>
</div>
<div class="form-group">
<label for="password">Password</label>
<input class="form-control" type="password" id="password"
name="password" placeholder="Password"/>
</div>
<div class="form-group">
<label for="username">Display Name</label>
<input class="form-control" type="text" id="username" name=
"username" placeholder="Display Name"/>
</div>
<div class="form-group">
<label for="file">Profile Image</label>
<input class="form-control" type="file" id="file" name=
"file"/>
</div>
<div class="form-group hidden">
<label for="imageUrl">Image URL</label>
<input type="text" name="imageUrl" id="imageUrl" value=
"${fn:escapeXml(imageUrl)}" class="form-control" />
</div>
<br/><br/>
<button class="btn" type="submit" id="signup" name="signup">Sign Up</button>
</form>
*...which submits a POST request to my signup servlet:*
public void doPost(HttpServletRequest req, HttpServletResponse resp) throws
ServletException,
IOException {
String state = new BigInteger(130, new SecureRandom()).toString(32);
// prevent request forgery
req.getSession().setAttribute("state", state);
if (req.getAttribute("loginDestination") != null) {
req
.getSession()
.setAttribute("loginDestination", (String) req.getAttribute(
"loginDestination"));
logger.log(
Level.INFO, "logging destination " + (String) req.getAttribute(
"loginDestination"));
} else {
req.getSession().setAttribute("loginDestination", "/Home");
logger.log(Level.INFO, "logging destination /Home");
}
CloudStorageHelper storageHelper =
(CloudStorageHelper) req.getServletContext().getAttribute(
"storageHelper");
String imageUrl =
storageHelper.getImageUrl(
req, resp, getServletContext().getInitParameter("skelly.bucket"));
UserDao dao = (UserDao) this.getServletContext().getAttribute(
"userDao");
byte[] salt = new SecureRandom().generateSeed(32);
byte[] hash = hashPassword(req.getParameter("password").
toCharArray(), salt, 27, 256);
String saltS = salt.toString();
String hashS = hash.toString();
String email = req.getParameter("email");
User user = new User.Builder()
.email(email)
.hash(hashS)
.salt(saltS)
.imageUrl(imageUrl)
.build();
try {
dao.createUser(user);
byte[] key = (byte[]) req.getSession().getAttribute("state"
);
Date date = new Date();
Calendar cal = Calendar.getInstance();
cal.setTime(date);
cal.add(Calendar.HOUR, 12);
Date exp = cal.getTime();
String iss = req.getScheme() + "://" +
req.getServerName() + ":" +
req.getServerPort();
String sub = (String) req.getAttribute("email");
String jwt =
Jwts.builder().setIssuer(iss)
.setSubject(sub)
.setExpiration(exp)
.claim("scope", "self api/buy")
.signWith(SignatureAlgorithm.HS256, key)
.compact();
req.getSession().setAttribute("token", jwt);
req.getSession().setAttribute("userEmail", req.getParameter(
"email"));
req.getSession().setAttribute("userImage", imageUrl);
resp.sendRedirect("/Home");
} catch(Exception e) {
throw new ServletException(e.getMessage(), e);
}
}
*...which calls the createUser() method in my UserDatastore servlet:*
public Long createUser(User user) throws SQLException, IOException {
IncompleteKey key = keyFactory.newKey(); // Key will be assigned
once written
FullEntity<IncompleteKey> incUserEntity = Entity.newBuilder(key) //
Create the Entity
.set(User.EMAIL, user.getEmail())
.set(User.SALT, user.getSalt())
.set(User.HASH, user.getHash())
.set(User.IMAGE_URL, user.getImageUrl())
.build(); // <---- THIS IS WHERE THE ERROR OCCURS!!! \\
Entity userEntity = datastore.add(incUserEntity); // Save the Entity
return userEntity.getKey().getId();
}
*...which leads to this 500 Server Error:*
HTTP ERROR 500
Problem accessing /SignupEmail. Reason:
Server Error
Caused by:
javax.servlet.ServletException: javax.servlet.ServletException
at
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:138)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at org.eclipse.jetty.server.Server.handle(Server.java:564)
at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
at
org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:251)
at
org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:279)
at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:110)
at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:124)
at
org.eclipse.jetty.util.thread.Invocable.invokePreferred(Invocable.java:122)
at
org.eclipse.jetty.util.thread.strategy.ExecutingExecutionStrategy.invoke(ExecutingExecutionStrategy.java:58)
at
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.produceConsume(ExecuteProduceConsume.java:201)
at
org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(ExecuteProduceConsume.java:133)
at
org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:672)
at
org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:590)
at java.lang.Thread.run(Thread.java:748)
Caused by: javax.servlet.ServletException
at com.example.getstarted.auth.SignupEmail.doPost(SignupEmail.java:137)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:707)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:790)
at
org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:841)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1634)
at
org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:206)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1621)
at
com.example.getstarted.util.DatastoreSessionFilter.doFilter(DatastoreSessionFilter.java:109)
at
org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1613)
at
org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:541)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
at
org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548)
at
org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:190)
at
org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1593)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:188)
at
org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1239)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:168)
at
org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:481)
at
org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1562)
at
org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:166)
at
org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1141)
at
org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141)
at
org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:213)
at
org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:118)
... 14 more
Caused by: java.lang.NullPointerException
at
com.google.common.base.Preconditions.checkNotNull(Preconditions.java:770)
at
com.google.common.collect.NaturalOrdering.compare(NaturalOrdering.java:36)
at
com.google.common.collect.NaturalOrdering.compare(NaturalOrdering.java:25)
at
com.google.common.collect.ByFunctionOrdering.compare(ByFunctionOrdering.java:43)
at java.util.TimSort.countRunAndMakeAscending(TimSort.java:355)
at java.util.TimSort.sort(TimSort.java:220)
at java.util.Arrays.sort(Arrays.java:1512)
at
com.google.common.collect.ImmutableSortedMap.fromEntries(ImmutableSortedMap.java:390)
at
com.google.common.collect.ImmutableSortedMap.fromEntries(ImmutableSortedMap.java:362)
at
com.google.common.collect.ImmutableSortedMap.copyOfInternal(ImmutableSortedMap.java:346)
at
com.google.common.collect.ImmutableSortedMap.copyOf(ImmutableSortedMap.java:237)
at com.google.cloud.datastore.BaseEntity.<init>(BaseEntity.java:458)
at com.google.cloud.datastore.FullEntity.<init>(FullEntity.java:47)
at
com.google.cloud.datastore.FullEntity$Builder.build(FullEntity.java:42)
at
com.example.getstarted.daos.UserDatastore.createUser(UserDatastore.java:115)
at com.example.getstarted.auth.SignupEmail.doPost(SignupEmail.java:111)
... 38 more
*Normally I am able to diagnose the problem by looking at the errors,
locating the problem, researching the problem, and finding a solution. But
this error is different than anything I have ever experienced for several
reasons:*
*1. It is a NullPointerException, but through testing I have not been able
to find where there is a null value.*
*2. It is thrown by the method checkNotNull which I have found little
discussions about, none of which helped me understand my specific dilemma.*
*3. The method that is throwing this error (createUser) is nearly IDENTICAL
to my other methods (createPost, createAlbum, createPhoto) that work just
fine, so this method should be working as well.*
*I have jumped dozens of complicated troubleshooting hurdles in the past
year, but I'm completely stumped on this one. I cannot find any reason
whatsoever that this error is being thrown.*
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