Do I have to import some additional statements to get my PrintWriter to work? If yes then which are they?
Thanks in advance 🙂
Unified Error PAge and Exception Handling
I am trying to implement a catch all for error handling, and I am trying to follow the advice posted in the Knowlesge Base: http://seamframework.org/Documentation/UnifiedErrorPageAndExceptionHandling
However the jsp page does not compile as it cannot resolve any of the Java types. This includes the page imports
<%@ page import="java.io.PrintWriter" %>
Error being:
The import java.io.PrintWriter cannot be resolved
Am I obviously missing something fundamental in my classpath. Do I need to copy existing jar files from the classpath to web-inf/classes? Or is it something else?
thanks in advance
Dave
PrintWriter (Java Platform SE 7 )
print
Prints formatted representations of objects to a text-output stream. This class implements all of themethods found in PrintStream . It does not contain methods for writing raw bytes, for which a program should use unencoded byte streams.
Unlike the PrintStream class, if automatic flushing is enabled it will be done only when one of the println , printf , or format methods is invoked, rather than whenever a newline character happens to be output. These methods use the platform’s own notion of line separator rather than the newline character.
Generator – The import com.google.gwt.core.ext cannot be resolved
Either email addresses are anonymous for this group or you need the view member email addresses permission to view the original message
Hi there,
I already have this error for quite a while and asked the forum a few
times, till now it remains unresolved, so I’ll have another try. When I
compile my source I get following error:
[gwtcompile] Compiling com.bar.Foo
[gwtcompile] Analyzing source in module ‘com.bar.Foo’
[gwtcompile] [ERROR] Errors in
[gwtcompile] [ERROR] Line 3: The import java.io.PrintWriter cannot be
resolved
[gwtcompile] [ERROR] Line 5: The import com.google.gwt.core.ext cannot
be resolved
[gwtcompile] [ERROR] Line 6: The import com.google.gwt.core.ext cannot
be resolved
[gwtcompile] [ERROR] Line 7: The import com.google.gwt.core.ext cannot
be resolved
[gwtcompile] [ERROR] Line 8: The import com.google.gwt.core.ext cannot
be resolved
[gwtcompile] [ERROR] Line 9: The import com.google.gwt.core.ext cannot
be resolved
[gwtcompile] [ERROR] Line 10: The import com.google.gwt.core.ext
cannot be resolved
[gwtcompile] [ERROR] Line 11: The import com.google.gwt.core.ext
cannot be resolved
[gwtcompile] [ERROR] Line 12: The import com.google.gwt.user.rebind
cannot be resolved
[gwtcompile] [ERROR] Line 13: The import com.google.gwt.user.rebind
cannot be resolved
[gwtcompile] [ERROR] Line 15: Generator cannot be resolved to a type
[gwtcompile] [ERROR] Line 16: TreeLogger cannot be resolved to a type
[gwtcompile] [ERROR] Line 16: GeneratorContext cannot be resolved to a
type
[gwtcompile] [ERROR] Line 17: UnableToCompleteException cannot be
resolved to a type
[gwtcompile] [ERROR] Line 19: TypeOracle cannot be resolved to a type
[gwtcompile] [ERROR] Line 20: JClassType cannot be resolved to a type
[gwtcompile] [ERROR] Line 27: SourceWriter cannot be resolved to a
type
[gwtcompile] [ERROR] Line 33: NotFoundException cannot be resolved to
a type
[gwtcompile] [ERROR] Line 34: TreeLogger cannot be resolved
[gwtcompile] [ERROR] Line 35: e cannot be resolved
[gwtcompile] [ERROR] Line 36: UnableToCompleteException cannot be
resolved to a type
[gwtcompile] [ERROR] Line 40: SourceWriter cannot be resolved to a
type
[gwtcompile] [ERROR] Line 40: TreeLogger cannot be resolved to a type
[gwtcompile] [ERROR] Line 41: GeneratorContext cannot be resolved to a
type
[gwtcompile] [ERROR] Line 43: PrintWriter cannot be resolved to a type
[gwtcompile] [ERROR] Line 47: ClassSourceFileComposerFactory cannot be
resolved to a type
[gwtcompile] [ERROR] Line 47: ClassSourceFileComposerFactory cannot be
resolved to a type
[gwtcompile] [ERROR] Line 54: SourceWriter cannot be resolved to a
type
The weird thing is that my ProxyGenerator works nonetheless. In my
classpath I have gwt-dev-windows.jar included, where obviously the
classes and the sources of the package com.google.gwt.core.ext are.
In my *gwt.xml file I have
I’m not sure if i need to inherit the Core module explicitly, as the
User.gwt.xml already inherits it.
So I’m wondering why the compiler is complaining? If I look into other
Generators, eg in the i18n module, there’s even not an inherit of the
Core module, and it evidently works.
I suppose that I perhaps have to add ato the com.google.gwt.core.ext, but I have no
idea how to do that and if this is the way to go.
Have some of you already successfully used generators without having a
complaining compiler?
Thanks for any hints.
Dominik
Why my printwriter throws an nullpointer error?
Java Copy Code
import javafx.application.Application; import javafx.event.ActionEvent; import javafx.fxml.FXML; import javafx.fxml.FXMLLoader; import javafx.scene.Parent; import javafx.scene.Scene; import javafx.scene.layout.VBox; import javafx.scene.text.Text; import javafx.stage.Stage; import javafx.scene.control.*; import java.io.IOException; import java.net.*; import java.io.PrintWriter; import java.util.Scanner; public class Client extends Application { private PrintWriter outputToServer; private Scanner inputFromServer; private Socket socket; private static InetAddress host = null; final int PORT = 1234 ; public static void main( String [] args) { try { host = InetAddress.getLocalHost(); } catch (UnknownHostException ex) { System.out.println( ” Host ID Not Found” ); } do { launch(args); } while (true); } public void start(Stage stage) throws Exception { socket = new Socket(host, PORT); inputFromServer = new Scanner(socket.getInputStream()); outputToServer = new PrintWriter(socket.getOutputStream(), true); Parent root = FXMLLoader.load(getClass().getResource( ” welcome.fxml” )); Scene scene; scene = new Scene(root, 500 , 500 ); stage = new Stage(); stage.setScene(scene); stage.show(); } @FXML private TextField Input; @FXML private void loginButton (ActionEvent event) { String t = Input.getText(); System.out.println(t); validateUsername(t); } @FXML private void validateUsername( String username) { if (username.isEmpty()) { } else { System.out.println(username); outputToServer.println(username); String serverRequest = inputFromServer.nextLine(); if (serverRequest.equals( ” true” )) { LoadClient(); } } } private void LoadClient() { Scene scene; VBox vbox; Stage stage; Button inbox = new Button( ” Inbox” ); Button email = new Button( ” Email” ); Button quit = new Button( ” Quit” ); inbox.setOnAction(e -> getInbox()); email.setOnAction(e -> getEmail()); quit.setOnAction(e -> quitApp()); vbox = new VBox(); vbox.getChildren().add(inbox); vbox.getChildren().add(email); vbox.getChildren().add(quit); scene = new Scene(vbox, 500 , 500 ); stage = new Stage(); stage.setScene(scene); stage.show(); } public void getInbox() { System.out.println( ” BEFORE SENDING INBOX REQUEST” ); outputToServer.println( ” get_inbox” ); System.out.println( ” AFTER SENDING INBOX REQUEST” ); } public void getEmail() { outputToServer.println( ” send_email” ); } public void quitApp() { outputToServer.println( ” close” ); }
Java Copy Code
import javafx.fxml.FXML; import java.io.IOException; import java.io.Serializable; import java.lang.reflect.Array; import java.net.ServerSocket; import java.util.ArrayList; import java.net.*; import java.io.*; import java.util.Scanner; public class Server implements Serializable { private static ArrayList users = new ArrayList(); private static ArrayList mails = new ArrayList(); public static void main( String [] args) throws IOException { users.add( ” U1″ ); users.add( ” U2″ ); users.add( ” U3″ ); Socket client; ServerSocket serverSocket = null; final int PORT = 1234 ; ClientHandler clientHandler; try { serverSocket = new ServerSocket( 1234 ); } catch (IOException ioEx) { System.out.println( ” Can’t set up port” ); System.exit( 1 ); } System.out.println( ”
Server running” ); do { client = serverSocket.accept(); String validUser = validateUser(client); clientHandler = new ClientHandler(validUser, client); clientHandler.start(); } while (true); } private static String validateUser(Socket client) { Scanner inputFromClient = null; PrintWriter outputToClient = null; boolean validUser = false; try { inputFromClient = new Scanner(client.getInputStream()); outputToClient = new PrintWriter(client.getOutputStream(), true); } catch (IOException io) { System.out.println( ” Problem initialising variables” ); } String userToValidate = inputFromClient.nextLine(); while (validUser == false) { for ( String username : users) { if (username.equals(userToValidate)) { validUser = true; break ; } } if (validUser == false) { outputToClient.println( ” false” ); userToValidate = inputFromClient.nextLine(); } else { outputToClient.println( ” true” ); } } return userToValidate; } private static ArrayList getMail() { return mails; } } class ClientHandler extends Thread implements Serializable { private Socket client; private Scanner input; private PrintWriter output; private String username; public ClientHandler( String username, Socket client) { this .username = username; this .client = client; System.out.println( ” BEFORE TRY” ); try { input = new Scanner(client.getInputStream()); output = new PrintWriter(client.getOutputStream(), true); } catch (IOException io) { System.out.println( ” Client Handler not set up properly” ); } } public void run() { String request = input.nextLine(); System.out.println(request); while (!request.equals( ” close” )) { if (request.equals( ” get_inbox” )) { System.out.println( ” INSIDE INBOX REQUEST” ); } else if (request.equals( ” send_email” )) { System.out.println( ” INSIDE SEND EMAIL REQUEST” ); } request = input.nextLine(); } try { System.out.println( ” Ending connection” ); client.close(); } catch (IOException io) { System.out.println( ” Coulnd’t close connection” ); } }
Java Copy Code
at javafx.fxml.FXMLLoader$ControllerMethodEventHandler.handle(FXMLLoader.java: 1657 ) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java: 86 ) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java: 238 ) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java: 191 ) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java: 59 ) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java: 58 ) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java: 114 ) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java: 56 ) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java: 114 ) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java: 56 ) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java: 114 ) at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java: 74 ) at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java: 49 ) at javafx.event.Event.fireEvent(Event.java: 198 ) at javafx.scene.Node.fireEvent(Node.java: 8413 ) at javafx.scene.control.Button.fire(Button.java: 185 ) at com.sun.javafx.scene.control.behavior.ButtonBehavior.mouseReleased(ButtonBehavior.java: 182 ) at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java: 96 ) at com.sun.javafx.scene.control.skin.BehaviorSkinBase$1.handle(BehaviorSkinBase.java: 89 ) at com.sun.javafx.event.CompositeEventHandler$NormalEventHandlerRecord.handleBubblingEvent(CompositeEventHandler.java: 218 ) at com.sun.javafx.event.CompositeEventHandler.dispatchBubblingEvent(CompositeEventHandler.java: 80 ) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java: 238 ) at com.sun.javafx.event.EventHandlerManager.dispatchBubblingEvent(EventHandlerManager.java: 191 ) at com.sun.javafx.event.CompositeEventDispatcher.dispatchBubblingEvent(CompositeEventDispatcher.java: 59 ) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java: 58 ) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java: 114 ) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java: 56 ) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java: 114 ) at com.sun.javafx.event.BasicEventDispatcher.dispatchEvent(BasicEventDispatcher.java: 56 ) at com.sun.javafx.event.EventDispatchChainImpl.dispatchEvent(EventDispatchChainImpl.java: 114 ) at com.sun.javafx.event.EventUtil.fireEventImpl(EventUtil.java: 74 ) at com.sun.javafx.event.EventUtil.fireEvent(EventUtil.java: 54 ) at javafx.event.Event.fireEvent(Event.java: 198 ) at javafx.scene.Scene$MouseHandler.process(Scene.java: 3757 ) at javafx.scene.Scene$MouseHandler.access$1500(Scene.java: 3485 ) at javafx.scene.Scene.impl_processMouseEvent(Scene.java: 1762 ) at javafx.scene.Scene$ScenePeerListener.mouseEvent(Scene.java: 2494 ) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run( GlassViewEventHandler.java: 381 ) at com.sun.javafx.tk.quantum.GlassViewEventHandler$MouseEventNotification.run( GlassViewEventHandler.java: 295 ) at java.security.AccessController.doPrivileged(Native Method) at com.sun.javafx.tk.quantum.GlassViewEventHandler.lambda$handleMouseEvent$354 (GlassViewEventHandler.java: 417 ) at com.sun.javafx.tk.quantum.QuantumToolkit.runWithoutRenderLock(QuantumToolki t.java: 389 ) at com.sun.javafx.tk.quantum.GlassViewEventHandler.handleMouseEvent(GlassViewE ventHandler.java: 416 ) at com.sun.glass.ui.View.handleMouseEvent(View.java: 555 ) at com.sun.glass.ui.View.notifyMouse(View.java: 937 ) Caused by: java.lang.reflect.InvocationTargetException at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java: 62 ) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImp l.java: 43 ) at java.lang.reflect.Method.invoke(Method.java: 498 ) at sun.reflect.misc.Trampoline.invoke(MethodUtil.java: 71 ) at sun.reflect.GeneratedMethodAccessor1.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java: 43 ) at java.lang.reflect.Method.invoke(Method.java: 498 ) at sun.reflect.misc.MethodUtil.invoke(MethodUtil.java: 275 ) at javafx.fxml.FXMLLoader$MethodHandler.invoke(FXMLLoader.java: 1769 ) … 45 more Caused by: java.lang.NullPointerException at Client.validateUsername(Client.java: 112 ) at Client.loginButton(Client.java: 99 ) … 55 mor
Hi everyone it’s been days that I’m stuck with this situation and I cannot resolve I’m trying to send the user entered text or numbers to the Server class using print write but every time I getting errors after I hit the submit button.Im new to java please help me.This is the Client.JavaThis is Server.javaAnd this is my error logI tried to find the problem but sadly any code I tried failed.
Eclipse Community Forums: Newcomers » Can’t avoid “cannot be resolved to a type” (Eclipse
Hi, hello to all members, this is my first post on this “forum”. The problem I can’t resolve is that I got the error: ” cannot be resolved to a type”. Have tried with project “Clean” but it not works. Can someone give me some information on what else I can do to avoid this kind of messages? For example, if I open the same project in NetBeans IDE, I don’t get any warning or error (but prefer to use Eclipse). If I try to build the project with mvn clean install, all works fine and I can “build” the project. thank you for any info regards Peter
When I get this error message it’s usually because I’ve left something off earlier in the file. For instance, I might use the WindowBuilder to make a JTextArea called txtrXcord, and then later add something to the java file that refer to txtrXcord before I come to the entry made by WindowBuilder. But the compiler doesn’t know what txtrXcord is. So it cannot be “resolved,” which means, “I can’t figure out what one of these txtrXcord things I supposed to be. “Declare txtrXcord as a JTextArea before it ever gets used, and remove the duplication below.Another thing might be to use, e.g., some javex item without having included the appropriate javex,whatever above with the other “includes.”
키워드에 대한 정보 printwriter cannot be resolved to a type
다음은 Bing에서 printwriter cannot be resolved to a type 주제에 대한 검색 결과입니다. 필요한 경우 더 읽을 수 있습니다.
이 기사는 인터넷의 다양한 출처에서 편집되었습니다. 이 기사가 유용했기를 바랍니다. 이 기사가 유용하다고 생각되면 공유하십시오. 매우 감사합니다!
사람들이 주제에 대해 자주 검색하는 키워드 httpservlet cannot be resolved to a type
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