I have two servlets in my project:
- The login servlet tooks the username and the password, checks if
user data is correct and eventually returns the name of the related
database;
- The debug servlet for now can only output a string.
In MainEntryPoint I call the login servlet before the debug servlet,
but I get an output that indicates that the debug servlet is called
before the login servlet; this is the code snippet:
logInService.logIn(userNameTextBox.getText(),
passWordTextBox.getText(), new AsyncCallback<String>() {
@Override
public void onFailure(Throwable caught) {
Window.alert("Log in failed!");
}
@Override
public void onSuccess(String result) {
dataBaseString = result;
}
});
deBugService.outPut("2) DataBase: " +
dataBaseString, new AsyncCallback<Void>() {
public void onFailure(Throwable caught) {
}
public void onSuccess(Void result) {
}
});
And this is the related output:
2) DataBase: null
1) DataBase: dataBaseName
On Aug 4, 4:00 pm, Juan Pablo Gardella <[email protected]>
wrote:
> "Is it necessary to include also Hibernate
> Validator?" No exactly hibernate validator, some jsr303 implementation. I
> think is necesary.
>
> "I tried to run again the project but the servlets were not
> executed in the correct order"
>
> I'm blind. Can you explain a little more your problem?
>
> Juan
>
> 2011/8/4 Apocalypto <[email protected]>
>
>
>
>
>
>
>
> > Thanks for the reply, I included "validation-api-1.0.0.GA.jar" and
> > "validation-api-1.0.0.GA-sources.jar" to project libraries and the
> > errors were solved. Is it necessary to include also Hibernate
> > Validator? I tried to run again the project but the servlets were not
> > executed in the correct order
>
> > On Aug 4, 1:48 pm, Juan Pablo Gardella <[email protected]>
> > wrote:
> > > Its a classpath issue:
>
> > > [ERROR] Line 97: ConstraintViolation cannot be resolved to a
> > > type
>
> > > Add the javax.validation
> > > jar<
> >http://mvnrepository.com/artifact/javax.validation/validation-api/1.0...>
> > > (jsr303)
> > > and some implementation<
> >http://stackoverflow.com/questions/1384968/is-there-an-implementation...>
> > > .
>
> > > Juan
>
> > > 2011/8/3 Apocalypto <[email protected]>
>
> > > > Hello GWT world, I'm a student who is trying to learn how to develop
> > > > with GWT framework. I already know well Java language but I'm stuck
> > > > with my first application: it's a simple log in interface which stores
> > > > user data into cookies, but I can't understand why it doesn't work
> > > > properly.
>
> > > > MainEntryPoint
>
> > > > private GWTLogInServiceAsync logInService =
> > > > GWT.create(GWTLogInService.class);
> > > > private GWTDeBugServiceAsync deBugService =
> > > > GWT.create(GWTDeBugService.class);
> > > > private String dataBaseString;
> > > > ...
> > > > logInButton.addClickHandler(new ClickHandler() {
>
> > > > public void onClick(ClickEvent event) {
> > > > dataBaseString = null;
>
> > > > logInService.logIn(userNameTextBox.getText(),
> > > > passWordTextBox.getText(), new AsyncCallback<String>() {
>
> > > > @Override
> > > > public void onFailure(Throwable caught) {
> > > > Window.alert("Log in failed!");
> > > > }
>
> > > > @Override
> > > > public void onSuccess(String result) {
> > > > dataBaseString = result;
> > > > }
> > > > });
>
> > > > deBugService.outPut("2) DataBase: " +
> > > > dataBaseString, new AsyncCallback<Void>() {
>
> > > > public void onFailure(Throwable caught) {
> > > > }
>
> > > > public void onSuccess(Void result) {
> > > > }
> > > > });
>
> > > > if (dataBaseString != null) {
> > > > logIn(userNameTextBox.getText(),
> > > > dataBaseString);
> > > > }
> > > > }
> > > > });
> > > > ...
> > > > private void logIn(String userName, String dataBase) {
> > > > Cookies.setCookie("userName", userName);
> > > > Cookies.setCookie("dataBase", dataBase);
>
> > > > Location.reload();
> > > > }
>
> > > > GWTLogInServiceImpl
>
> > > > public String logIn(String userName, String passWord) {
> > > > String dataBase = null;
>
> > > > try {
> > > > Class.forName("org.postgresql.Driver");
>
> > > > Connection connection =
> > > > DriverManager.getConnection("jdbc:postgresql://localhost:5432/User
> > > > DataBase", postGreSQLUserName, postGreSQLPassWord);
>
> > > > String query = "SELECT \"DataBase\" FROM \"User\" WHERE
> > > > \"Name\" = '" + userName + "' AND \"PassWord\" = '" + passWord + "'";
>
> > > > ResultSet resultSet =
> > > > connection.createStatement().executeQuery(query);
>
> > > > if (resultSet.next()) {
> > > > dataBase = resultSet.getString("DataBase");
> > > > }
> > > > } catch (Exception exception) {
> > > > exception.printStackTrace();
> > > > }
>
> > > > System.out.println("1) DataBase: " + dataBase);
>
> > > > return dataBase;
> > > > }
>
> > > > GWTDeBugServiceImpl
>
> > > > public void outPut(String string) {
> > > > System.out.println(string);
> > > > }
>
> > > > I get the following output:
> > > > 2) DataBase: null
> > > > 1) DataBase: dataBaseName
>
> > > > Why does it execute GWTDeBugService before GWTLogInService? I'm using
> > > > NetBeans 6.9.1 with the latest GWT framework and GWT4NB plugin.
> > > > In addition, during compilation I get the following errors:
> > > > Validating newly compiled units
> > > > [ERROR] Errors in 'jar:file:/{projectFolder}/lib/GWT2.3.0/gwt-
> > > > user.jar!/com/google/gwt/editor/client/EditorDriver.java'
> > > > [ERROR] Line 20: The import
> > > > javax.validation.ConstraintViolation cannot be resolved
> > > > [ERROR] Line 97: ConstraintViolation cannot be resolved to a
> > > > type
> > > > [ERROR] Errors in 'jar:file:/{projectFolder}/lib/GWT2.3.0/gwt-
> > > > user.jar!/com/google/gwt/editor/client/impl/
> > > > AbstractSimpleBeanEditorDriver.java'
> > > > [ERROR] Line 28: Name clash: The method
> > > > setConstraintViolations(Iterable<ConstraintViolation<?>>) of type
> > > > BaseEditorDriver<T,E> has the same erasure as
> > > > setConstraintViolations(Iterable<ConstraintViolation<?>>) of type
> > > > EditorDriver<T> but does not override it
> > > > [ERROR] Errors in 'jar:file:/{projectFolder}/lib/GWT2.3.0/gwt-
> > > > user.jar!/com/google/gwt/editor/client/impl/BaseEditorDriver.java'
> > > > [ERROR] Line 31: The import
> > > > javax.validation.ConstraintViolation cannot be resolved
> > > > [ERROR] Line 67: ConstraintViolation cannot be resolved to a
> > > > type
> > > > [ERROR] Errors in 'jar:file:/{projectFolder}/lib/GWT2.3.0/gwt-
> > > > user.jar!/com/google/gwt/editor/client/impl/SimpleViolation.java'
> > > > [ERROR] Line 25: The import
> > > > javax.validation.ConstraintViolation cannot be resolved
> > > > [ERROR] Line 40: ConstraintViolation cannot be resolved to a
> > > > type
> > > > [ERROR] Line 43: ConstraintViolation cannot be resolved to a
> > > > type
> > > > [ERROR] Line 44: Missing code implementation in the compiler
> > > > [ERROR] Line 49: ConstraintViolation cannot be resolved to a
> > > > type
> > > > [ERROR] Line 49: Missing code implementation in the compiler
> > > > [ERROR] Line 70: ConstraintViolation cannot be resolved to a
> > > > type
> > > > [ERROR] Line 72: ConstraintViolation cannot be resolved to a
> > > > type
> > > > [ERROR] Line 73: ConstraintViolation<?> cannot be resolved to
> > > > a type
> > > > [ERROR] Line 77: ConstraintViolation<capture#2-of ?> cannot
> > > > be resolved to a type
> > > > [ERROR] Line 81: ConstraintViolation<capture#3-of ?> cannot
> > > > be resolved to a type
> > > > [ERROR] Line 89: ConstraintViolation<capture#4-of ?> cannot
> > > > be resolved to a type
> > > > [ERROR] Line 93: ConstraintViolation<capture#5-of ?> cannot
> > > > be resolved to a type
> > > > [ERROR] Line 98: ConstraintViolation cannot be resolved to a
> > > > type
> > > > [ERROR] Errors in 'jar:file:/{projectFolder}/lib/GWT2.3.0/gwt-
> > > > user.jar!/com/google/gwt/editor/client/testing/
> > > > MockSimpleBeanEditorDriver.java'
> > > > [ERROR] Line 26: The import
> > > > javax.validation.ConstraintViolation cannot be resolved
> > > > [ERROR] Line 35: The type MockSimpleBeanEditorDriver<T,E>
> > > > must implement the inherited abstract method
> > > > EditorDriver<T>.setConstraintViolations(Iterable<ConstraintViolation<?
> > > > >>)
> > > > [ERROR] Line 107: Name clash: The method
> > > > setConstraintViolations(Iterable<ConstraintViolation<?>>) of type
> > > > MockSimpleBeanEditorDriver<T,E> has the same erasure as
> > > > setConstraintViolations(Iterable<ConstraintViolation<?>>) of type
> > > > EditorDriver<T> but does not override it
> > > > [ERROR] Line 108: ConstraintViolation cannot be resolved to a
> > > > type
> > > > [ERROR] Errors in 'jar:file:/{projectFolder}/lib/GWT2.3.0/gwt-
> > > > user.jar!/javax/validation/super/javax/validation/Configuration.java'
> > > > [ERROR] Line 93: TraversableResolver cannot be resolved to a
> > > > type
> > > > [ERROR] Line 105: ConstraintValidatorFactory cannot be
> > > > resolved to a type
> > > > [ERROR] Line 182: TraversableResolver cannot be resolved to a
> > > > type
> > > > [ERROR] Line 182: No source code is available for type
> > > > TraversableResolver; did you forget to inherit a required module?
> > > > [ERROR] Line 194: ConstraintValidatorFactory cannot be
> > > > resolved to a type
> > > > [ERROR] Line 194: No source code is available for type
> > > > ConstraintValidatorFactory; did you forget to inherit a required
> > > > module?
> > > > [ERROR] Line 202: ValidatorFactory cannot be resolved to a
> > > > type
> > > > [ERROR] Line 202: No source code is available for type
> > > > ValidatorFactory; did you forget to inherit a required module?
> > > > [ERROR] Errors in 'jar:file:/{projectFolder}/lib/GWT2.3.0/gwt-
> > > > user.jar!/javax/validation/
> > > > ConstraintViolationException_CustomFieldSerializer.java'
> > > > [ERROR] Line 30: ConstraintViolationException cannot be
> > > > resolved to a type
> > > > [ERROR] Line 34: ConstraintViolationException cannot be
> > > > resolved to a type
> > > > [ERROR] Line 34: No source code is available for type
> > > > ConstraintViolationException; did you forget to inherit a required
> > > > module?
> > > > [ERROR] Line 39: ConstraintViolation cannot be resolved to a
> > > > type
> > > > [ERROR] Line 39: ConstraintViolation cannot be resolved to a
> > > > type
> > > > [ERROR] Line 40: ConstraintViolationException cannot be
> > > > resolved to a type
>
> ...
>
> read more »
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