Program: 99337
Project: 99337
Buggy source:
@Override protected ViewModel onValidSubmit(HttpServletRequest req,HttpServletResponse resp,Form form) throws Exception {
  Account account=client.instantiate(Account.class);
  String value=form.getFieldValue("String_Node_Str");
  if (value != null) {
    account.setEmail(value);
  }
  value=form.getFieldValue("String_Node_Str");
  if (value != null) {
    account.setUsername(value);
  }
  value=form.getFieldValue("String_Node_Str");
  if (value != null) {
    account.setPassword(value);
  }
  value=form.getFieldValue("String_Node_Str");
  account.setGivenName(value != null ? value : "String_Node_Str");
  value=form.getFieldValue("String_Node_Str");
  if (value != null) {
    account.setMiddleName(value);
  }
  value=form.getFieldValue("String_Node_Str");
  account.setSurname(value != null ? value : "String_Node_Str");
  account.getCustomData().putAll(getCustomData(req,form));
  Application app=ApplicationResolver.INSTANCE.getApplication(req);
  if (preRegisterHandler != null) {
    if (!preRegisterHandler.handle(req,resp,account)) {
      return null;
    }
  }
  AccountStore accountStore=accountStoreResolver.getAccountStore(req,resp);
  if (accountStore == null) {
    account=app.createAccount(account);
  }
 else {
    final Account[] accountHolder=new Account[]{account};
    accountStore.accept(new AccountStoreVisitorAdapter(){
      @Override public void visit(      Directory directory){
        Account createdAccount=directory.createAccount(accountHolder[0]);
        accountHolder[0]=createdAccount;
      }
      @Override public void visit(      Organization organization){
        Account createdAccount=organization.createAccount(accountHolder[0]);
        accountHolder[0]=createdAccount;
      }
    }
);
    account=accountHolder[0];
  }
  publishRequestEvent(new DefaultRegisteredAccountRequestEvent(req,resp,account));
  if (postRegisterHandler != null) {
    if (!postRegisterHandler.handle(req,resp,account)) {
      return null;
    }
  }
  AccountStatus status=account.getStatus();
  if (isJsonPreferred(req,resp)) {
    return new DefaultViewModel(STORMPATH_JSON_VIEW_NAME,java.util.Collections.singletonMap("String_Node_Str",accountModelFactory.toMap(account,Collections.EMPTY_LIST)));
  }
  if (status == AccountStatus.ENABLED) {
    if (autoLogin) {
      final AuthenticationResult result=new TransientAuthenticationResult(account);
      this.authenticationResultSaver.set(req,resp,result);
    }
 else {
      return new DefaultViewModel(loginUri + "String_Node_Str").setRedirect(true);
    }
  }
 else   if (status == AccountStatus.UNVERIFIED) {
    return new DefaultViewModel(loginUri + "String_Node_Str").setRedirect(true);
  }
  return new DefaultViewModel(nextUri).setRedirect(true);
}

Fixed version (ground truth):
@Override protected ViewModel onValidSubmit(HttpServletRequest req,HttpServletResponse resp,Form form) throws Exception {
  Account account=client.instantiate(Account.class);
  String value=form.getFieldValue("String_Node_Str");
  if (value != null) {
    account.setEmail(value);
  }
  value=form.getFieldValue("String_Node_Str");
  if (value != null) {
    account.setUsername(value);
  }
  value=form.getFieldValue("String_Node_Str");
  if (value != null) {
    account.setPassword(value);
  }
  value=form.getFieldValue("String_Node_Str");
  account.setGivenName(value != null ? value : "String_Node_Str");
  value=form.getFieldValue("String_Node_Str");
  if (value != null) {
    account.setMiddleName(value);
  }
  value=form.getFieldValue("String_Node_Str");
  account.setSurname(value != null ? value : "String_Node_Str");
  account.getCustomData().putAll(getCustomData(req,form));
  Application app=ApplicationResolver.INSTANCE.getApplication(req);
  if (preRegisterHandler != null) {
    if (!preRegisterHandler.handle(req,resp,account)) {
      return null;
    }
  }
  AccountStore accountStore=accountStoreResolver.getAccountStore(req,resp);
  if (accountStore == null) {
    account=app.createAccount(account);
  }
 else {
    final Account[] accountHolder=new Account[]{account};
    accountStore.accept(new AccountStoreVisitorAdapter(){
      @Override public void visit(      Directory directory){
        Account createdAccount=directory.createAccount(accountHolder[0]);
        accountHolder[0]=createdAccount;
      }
      @Override public void visit(      Organization organization){
        Account createdAccount=organization.createAccount(accountHolder[0]);
        accountHolder[0]=createdAccount;
      }
    }
);
    account=accountHolder[0];
  }
  publishRequestEvent(new DefaultRegisteredAccountRequestEvent(req,resp,account));
  if (postRegisterHandler != null) {
    if (!postRegisterHandler.handle(req,resp,account)) {
      return null;
    }
  }
  AccountStatus status=account.getStatus();
  if (isJsonPreferred(req,resp)) {
    return new DefaultViewModel(STORMPATH_JSON_VIEW_NAME,java.util.Collections.singletonMap("String_Node_Str",accountModelFactory.toMap(account,Collections.EMPTY_LIST)));
  }
  if (status == AccountStatus.ENABLED) {
    if (autoLogin) {
      final AuthenticationResult result=new TransientAuthenticationResult(account);
      this.authenticationResultSaver.set(req,resp,result);
    }
 else {
      return new DefaultViewModel(loginUri + "String_Node_Str").setRedirect(true);
    }
  }
 else   if (status == AccountStatus.UNVERIFIED) {
    invalidateAccountCache(account);
    return new DefaultViewModel(loginUri + "String_Node_Str").setRedirect(true);
  }
  return new DefaultViewModel(nextUri).setRedirect(true);
}