Java : Import a class programmatically

I have a CompilationUnit that contains a class where a reference to another class is not imported. Eclipse resolves that kind of issue easily and proposes to import the missing class (which is located in the parent package).
How can I import a missing class programmatically without knowing its name or location ?
Reflection, injection, ClassLoader and other runtime mechanisms are not the right choice as I'm processing the classes statically through the Eclipse JDT API. Please, I'm just looking for a static oriented solution.
FYI : this how we list the imports from a CompilationUnit :
List<ImportDeclaration> existingImports = aCompilationUnit.imports();
The problem is that I don't know how to generate missing ImportDeclaration.
Thanks.

For manipulating the imports of a Java file please see class org.eclipse.jdt.core.dom.rewrite.ImportRewrite: the javadoc outlines its usage.
If all you have is an unresolvable simple name, utilities like ASTResolving.guessBindingForTypeReference(node) come in handy.
If that doesn't work for you, you may have to use the org.eclipse.jdt.core.search.SearchEngine and somehow cope with potentially many matches for a given simple name.
HTH,
Stephan

Similar Messages

Import the classes in the package java.util

I haven't taken a class in two years so I have ideas but am unsure of myself, and I most likely am way off base, but is this how you import the classes in the package java.util
import java.util.*;
I would appreciate anyone's help. I have a lot of questions.
Thanks,
rp

My assignment is below so that you will know exactly what I am asking. I am being asked to create an instance of LinkedList. I know that this is a part of the java.util. So when you create an instance of LinkedList would that be similar to instance variables? or am I misunderstanding something. I have several ideas, so I will start with the first one.
LinkList();
I really appreciate your taking the time to answer my questions to help me to rebuild my confidence in doing this.
Thanks,
// 2. import the classes in the package java.util
public class MyProgram
     public static void main(String [] args)
          // 3. Create an instance of LinkedList
          // 4. add 5 entries to the list so that it contains
          //     Ann, Bart, Carl, Dirk, Zak
          // 5. display the list on one line using a loop and ADT list methods
          System.out.println("\n\n3. ");
          // 6. display the list using one println
          System.out.println("\n\n4. ");
          // 7. create a ListIterator object for the list
          // 8. display the list on one line using the iterator
          System.out.println("\n\n6. ");
          // 9. restore the iterator to the first item in the list
          // 10. retrieve and display the first item in the iteration,
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          System.out.println("\n\n8. ");
          // 11. advance the iterator to the end of the list without displaying anything;
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          // 12. display the last item in the list
          System.out.println("\n\n10. ");
          // 13. move back to the beginning of the list without displaying anything;
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          // 14. display the first item in the list
          System.out.println("\n\n12. ");
          // 15. advance the iterator to the end of the list without displaying anything;
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          // 17. advance the iterator within a try block; catch the exception, display a message,,
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          // 20. add the string "New" to the list; where is it inserted relative to
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          System.out.println("\n\n18. ");
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Java Importer don't list my classes

Hello,
I have made a little web services test, created a jar file with Jdev 9.0.5.2, adapt the CLASSPATH to point to this jar, adapt the default.env Forms configuration file, but can't see my package in the Java Importer.
Where am i wrong ?
(Forms 9.0.2.11)
Francois

Ok, now i can see the class.
But when i try to import it i get this famous message:
Import de la classe demo.traduction.TranslateServiceStub...
Exception : java.lang.NoClassDefFoundError: oracle/jdeveloper/webservices/runtime/WrappedDocLiteralStubwich is probably the step 2 of how to have a good start with java !
any idea ? (CLASSPATH is setted ok)
Francois

Does java import loads the class?

Hi,
Acc common practive {not mentioned in Sun java convention} if a class is using more than three classes from a pacakage then its ideal to import all the classes from tht package instead of importing individual classes. i.e., import pacakage.*;
1) Does this kind of load all the classes into memory?
2) Does import statement actually loads a class into memory
isnt import jst to use class name instead of complete package name in the code?
3) Does a class get loaded only when its object/ its static memebers are invoked?
Would appreciate if anyone can answer these queries.
Thanks
Deepak

Acc common practive {not mentioned in Sun java
convention} And not mentioned or usually followed anywhere else. Who says this?
if a class is using more than three
classes from a pacakage then its ideal to import all
the classes from tht package instead of importing
individual classes. i.e., import pacakage.*;
1) Does this kind of load all the classes into
memory?imports have no influence on anything but the length of written code. Thanks for being the second person this hour to ask this question without researching first.
2) Does import statement actually loads a class into
memoryNo. It does nothing at all.
isnt import jst to use class name instead of complete
package name in the code?Yes.
3) Does a class get loaded only when its object/ its
static memebers are invoked?Yes.

Java application with classes to Applet?

Hello,
First, I'm a Java junior, but I can make efforts to analyse and understand code.
I saw an interesting open-source multiplayer poker java application: [JiBi's Hold'Em|http://sourceforge.net/projects/jibisholdem/]
I would like to try to add it as an Applet on my server, but I have some questions.
1- Do you think it is possible to make it fully works as an Applet (eg: through a proxy), as it seems to use a specific protocol and many classes?
2- I tried the idea of GumB: http://forums.sun.com/thread.jspa?threadID=390846&start=13&tstart=0
with getContentPane().add( new javaApp().getContentPane()but I have the following error message:
I also tried with imports (import holdem.core.Card;etc) and with HoldEmClientGUI().getContentPane() or holdem.gui.HoldEmClientGUI().getContentPane()
D:\JiBisHoldem\src\holdem\gui\HoldEmApp.java:7: cannot find symbol
symbol : class HoldEmClientGUI
location: class HoldEmApp
        getContentPane().add( new HoldEmClientGUI().getContentPane() );
                                  ^
1 errorAm I close or really far from a working result?
Thanks
John.

The above way seems to have the same result as getContentPane().add( new javaApp().getContentPane().
Here is my HoldEmClientGUI.java (I have commented unused lines like title):
package holdem.gui;
import holdem.core.Card;
import holdem.core.Choice;
import holdem.core.Player;
import holdem.gui.interfaces.ClientGUIInterface;
import holdem.gui.menu.MainMenuBar;
import holdem.gui.panel.PokerChoiceListPane;
import holdem.gui.panel.PokerMainPane;
import holdem.gui.panel.PokerPlayerPane;
import java.awt.BorderLayout;
import java.io.IOException;
import java.util.ArrayList;
import java.util.HashMap;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JApplet;
import sun.audio.AudioPlayer;
import sun.audio.AudioStream;
import tools.AppProperties;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import javax.swing.*;
public class HoldEmClientGUI extends JApplet {
     public static void main(String[] args) {
          HoldEmClientGUI app = new HoldEmClientGUI();
          app.init();
          app.start();
     public void init()
          AppletContext ac = null;
          try
               ac = getAppletContext();
          catch(NullPointerException npe)
          //new HoldEmClientGUIFrame(ac);
          new HoldEmClientGUIFrame();
class HoldEmClientGUIFrame extends JFrame implements ClientGUIInterface {
     private static final long serialVersionUID = 1L;
     private String m_mainTitle = "";
     private String m_title1 = "";
     private String m_title2 = "";
     private HashMap<Integer, PokerPlayerPane> m_playerPaneList = null;
     private PokerMainPane m_pokerMainPane = null;
     private MainMenuBar m_pokerMainMenuBar = null;
     private PokerChoiceListPane m_pokerChoiceListPane = null;
     //AppletContext ac;
     //HoldEmClientGUI(AppletContext ac) {
     HoldEmClientGUIFrame() {
          //super();
          //this.ac = ac;
          //Set Icon
          //setIconImage(new ImageIcon(getClass().getResource(AppProperties.getInstance().getProperty("holdem.images.icon.logo"))).getImage());
          m_mainTitle = AppProperties.getInstance()
                    .getProperty("holdem.config.title")
                    + " - v"
                    + AppProperties.getInstance().getProperty(
                              "holdem.config.version");
          //refreshTitle();
          // adding PokerTable
          getContentPane().add(getPokerMainPane(), BorderLayout.CENTER);
          getContentPane().add(getPokerChoiceListPane(), BorderLayout.SOUTH);
          getContentPane().add(getPokerMainMenuBar(), BorderLayout.NORTH);
          // init playerPaneList
          m_playerPaneList = new HashMap<Integer, PokerPlayerPane>();
          //setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
          // setSize(200, 100);
          /* Add the window listener */
          addWindowListener(new WindowAdapter()
               public void windowClosing(WindowEvent evt)
                    dispose();
                    if (AppletApplicationFrame.this.ac == null)
                         System.exit(0);
          setVisible(true);
          pack();
     private void refreshTitle(){
          //setTitle(m_mainTitle+m_title1+m_title2);
     private PokerMainPane getPokerMainPane() {
          if (m_pokerMainPane == null) {
               m_pokerMainPane = new PokerMainPane();
          return m_pokerMainPane;
     private PokerChoiceListPane getPokerChoiceListPane() {
          if (m_pokerChoiceListPane == null) {
               m_pokerChoiceListPane = new PokerChoiceListPane();
          return m_pokerChoiceListPane;
     private MainMenuBar getPokerMainMenuBar() {
          if (m_pokerMainMenuBar == null) {
               m_pokerMainMenuBar = new MainMenuBar();
          return m_pokerMainMenuBar;
     public void addPlayer(Player player) {
          PokerPlayerPane playerPane = new PokerPlayerPane();
          playerPane.initPlayer(player.getId(), player.getSeatNumber(), player
                    .getNickname(), player.getStack(), player.getPlayerType());
          getPokerMainPane().addOnSeat(playerPane, player.getSeatNumber());
          m_playerPaneList.put(player.getId(), playerPane);
     public void setPlayerCardHighlighted(boolean highlighted, int playerId,
               int cardNumber) {
          PokerPlayerPane playerPane = getPlayerPaneByPlayerID(playerId);
          if (playerPane != null) {
               playerPane.setCardHighlighted(highlighted, cardNumber);
     public void setTableCardHighlighted(boolean highlighted, int cardNumber) {
          m_pokerMainPane.setCardHighlighted(highlighted, cardNumber);
     public void setAllCardsHighlighted(boolean highlighted) {
          ArrayList<PokerPlayerPane> playerPaneList = new ArrayList<PokerPlayerPane>(
                    m_playerPaneList.values());
          for (int playerCounter = 0; playerCounter < playerPaneList.size(); playerCounter++) {
               playerPaneList.get(playerCounter)
                         .setCardHighlighted(highlighted, 0);
          m_pokerMainPane.setCardHighlighted(highlighted, 0);
     public Choice displayChoices(ArrayList<Choice> choiceList) {
          return getPokerChoiceListPane().displayChoices(choiceList);
     public void displayAsyncMsg(String msg) {
          getPokerMainPane().displayTempoMsg(msg);
     public int getBetValue() {
          return getPokerChoiceListPane().getBetValue();
     public void addCardToPlayer(int playerId, Card card) {
          PokerPlayerPane playerPane = getPlayerPaneByPlayerID(playerId);
          if (playerPane != null) {
               playerPane.addCard(card);
     public void addCardToTable(Card card) {
          getPokerMainPane().addCardToTable(card);
     public void removeCardsFromPlayer(int playerId) {
          PokerPlayerPane playerPane = getPlayerPaneByPlayerID(playerId);
          if (playerPane != null) {
               playerPane.removeCards();
     public void removeCardsFromPlayers() {
          ArrayList<PokerPlayerPane> playerPaneList = new ArrayList<PokerPlayerPane>(
                    m_playerPaneList.values());
          for (int playerCounter = 0; playerCounter < playerPaneList.size(); playerCounter++) {
               playerPaneList.get(playerCounter).removeCards();
     public void removeCardsFromTable() {
          getPokerMainPane().removeCards();
     private PokerPlayerPane getPlayerPaneByPlayerID(int playerID) {
          PokerPlayerPane foundPlayerPane = (PokerPlayerPane) m_playerPaneList
                    .get(playerID);
          return foundPlayerPane;
     public void setButton(int seatNumber, int buttonType) {
          m_pokerMainPane.setButton(seatNumber, buttonType);
     public void setConnectionStatus(boolean isConnected, String nickname) {
          m_pokerMainMenuBar.setConnectionStatus(isConnected);
          m_title1 = " - " + nickname;
          if (isConnected) {
               m_title1+=" is Connected";
          } else {
               m_title1+=" is not Connected";
          refreshTitle();
     public void setPot(int potValue) {
          getPokerMainPane().setPot(potValue);
     public void setPlayerStack(int playerID, int newStack) {
          PokerPlayerPane playerPane = getPlayerPaneByPlayerID(playerID);
          if (playerPane != null) {
               playerPane.setStack(newStack);
     public void setCurrentBetValue(int playerID, int betValue) {
          PokerPlayerPane playerPane = getPlayerPaneByPlayerID(playerID);
          if (playerPane != null) {
               playerPane.setCurrentBet(betValue);
     public void setPlayerAction(int playerID, int PLAYER_ACTION) {
          PokerPlayerPane playerPane = getPlayerPaneByPlayerID(playerID);
          if (playerPane != null) {
               playerPane.setAction(PLAYER_ACTION);
     public void playSound(int ACTION) {
          String soundPath = "";
          switch (ACTION) {
          case ClientGUIInterface.ACTION_ALLIN: {
               soundPath = AppProperties.getInstance().getProperty(
                         "holdem.sounds.chips.allin");
               break;
          case ClientGUIInterface.ACTION_BET: {
               soundPath = AppProperties.getInstance().getProperty(
                         "holdem.sounds.chips");
               break;
          case ClientGUIInterface.ACTION_CALL: {
               soundPath = AppProperties.getInstance().getProperty(
                         "holdem.sounds.chips");
               break;
          case ClientGUIInterface.ACTION_RAISE: {
               soundPath = AppProperties.getInstance().getProperty(
                         "holdem.sounds.chips");
               break;
          case ClientGUIInterface.ACTION_PAY_SMALL_BLIND: {
               soundPath = AppProperties.getInstance().getProperty(
                         "holdem.sounds.chips");
               break;
          case ClientGUIInterface.ACTION_PAY_BIG_BLIND: {
               soundPath = AppProperties.getInstance().getProperty(
                         "holdem.sounds.chips");
               break;
          case ClientGUIInterface.ACTION_CHECK: {
               soundPath = AppProperties.getInstance().getProperty(
                         "holdem.sounds.check");
               break;
          case ClientGUIInterface.ACTION_FOLD: {
               soundPath = AppProperties.getInstance().getProperty(
                         "holdem.sounds.fold");
               break;
          case ClientGUIInterface.ACTION_DEAL_CARDS: {
               soundPath = AppProperties.getInstance().getProperty(
                         "holdem.sounds.card");
               break;
          case ClientGUIInterface.ACTION_REMOVE_CARDS: {
               soundPath = AppProperties.getInstance().getProperty(
                         "holdem.sounds.remove_cards");
               break;
          default: {
          if (soundPath != null && !soundPath.trim().equals("")) {
               try {
                    AudioPlayer.player.start(new AudioStream(getClass()
                              .getResource(soundPath).openStream()));
               } catch (IOException ioe) {
                    System.err.println("Unable to play sound:\n" + soundPath
                              + "\n\n" + ioe);
     private void displayBlindValues(int curSB, int curBB, int nextSB, int nextBB){
          //m_title2=" - "+curSB+"/"+curBB+" (next values "+nextSB+"/"+nextBB+")";
          //refreshTitle();
     public void raiseBlinds(int curSB, int curBB, int nextSB, int nextBB){
          displayBlindValues(curSB,curBB,nextSB,nextBB);
}The error when calling HoldEmClientGUI.class (I have 2 files HoldEmClientGUI.class and HoldEmClientGUIFrame.class, is it normal?):
java.lang.VerifyError: (class: holdem/gui/menu/MainMenuBar, method: handleSettingsItem signature: ()V) Incompatible argument to function
     at holdem.gui.HoldEmClientGUIFrame.getPokerMainMenuBar(HoldEmClientGUI.java:145)
     at holdem.gui.HoldEmClientGUIFrame.<init>(HoldEmClientGUI.java:95)
     at holdem.gui.HoldEmClientGUI.init(HoldEmClientGUI.java:54)
     at sun.applet.AppletPanel.run(Unknown Source)
     at java.lang.Thread.run(Unknown Source)MainMenuBar.java:
import holdem.gui.dialog.ClientInputDialog;
import holdem.gui.dialog.ServerInputDialog;
import holdem.gui.dialog.SettingsDialog;
     private void handleSettingsItem() {
          new SettingsDialog(getHoldEmClientGUI());
     private HoldEmClientGUI getHoldEmClientGUI() {
          HoldEmClientGUI gui = null;
          Container curContainer = this;
          do {
               curContainer = curContainer.getParent();
          } while (curContainer instanceof Container
                    && !(curContainer instanceof HoldEmClientGUI));
          if (curContainer instanceof HoldEmClientGUI) {
               gui = (HoldEmClientGUI) curContainer;
          return gui;
     }I think the problem comes from private HoldEmClientGUI getHoldEmClientGUI() but I don't know what is wrong in it.
Edited by: Quezako on Oct 14, 2008 7:51 AM

How to import a class not in the package from a package

how to import a class not in the package from a package?

http://java.sun.com/docs/books/tutorial/java/interpack/usepkgs.html

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Hi ,
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<%@ page import="myclass" &>
i got an error that myclass not found. I have placed into tomcat\webapps\myproject\web-inf\classes directory. So How will I set the classpath for myclass to work?
thanks.

I was able to simulate your problem when I created a mismatch in the case of the name of the class.
for example if my program is called MyClass.java
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regards,
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org.apache.jasper.JasperException: Unable to compile class for JSP
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the import statement:
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Yeah, the package is present inside my WEB-INF/classes folder . I placed the import statement just after the java import statements.
<%@ page import="java.util.List" %>
// other java imports here
<%@ page import="com.las.dspms.skill.*"%>

Java import statement problems

Hello...
I have the book "Java in a Nutshell, 2nd ed" and have a query about a nested top-level interface example they have in the book.
Basically there's two files/classes. The first, LinkedList.java, is as follows:
public class LinkedList {
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Next is LinkedList.java as follows:
import LinkedList.*;
class LinkableInteger2 implements Linkable {
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Now I thought the import statement had two forms - and both used a package name as part of the statement:
import package.class;
import package.*;
Obviously, neither class has a package statement.
As written, these classes do not compile. Am I right in assuming the lack of a package name is causing this problem, or is there something else going on here?
Thanks...
Mark.

Since you don't have package statements in the files, the classes are being placed in the default package. You cannot explicitly import classes from the default package. Al classes in the default package, the java.lang package and the current package are always imported automatically. Your import statement is incorrect - remove it.

Import packageless classes in a jsp : tomcat 5.0.16

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I am trying to import a class, say one.class, which is stored in the /WEB-INF/classes folder of the webapplication into a jsp page. Like,
<%@page import="one"%>
I get the following error,
C:\jakarta-tomcat-5.0.16\work\Catalina\localhost\test\org\apache\jsp\testing_jsp.java:7: '.' expected
import one;
what could the problem be? I suppose, the problem is in accessing a class which is not inside a jar.
take care,
Siddharth.

Hi,
If you are using jdk 1.4 and above, you need to have package name for classes .
You could just give a try after removing the import statement . Perhaps the server could find the classes in your WEB-INF/classes directory. I doubt though.
-Amol

JAVA Importer: ORA-105100 can't start the java virtual machine

Hi,
i am having trouble to make a work interaction between forms and java.
My PL/SQL code is calling a java code situated in an imported class.
the error i get says : can't start the java virtual machine
I modified the CLASSPATH to add some jar files.
What else should i do ?
should i modify LIBPATH ?
any idea ?
Thanks
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i just found this documentation Oracle Forms Developer and Forms Server 6i (Patch 4) at this adress
http://download.oracle.com/otn_hosted_doc/forms/forms/p4_relnotef.pdf
which says that i need jdk 1.2.2 to make it work but the documentation was published in 2001...
Is there an earlier doc ? or an earlier doc of the java importer ?
http://www.oracle.com/technology/products/forms/pdf/javaimporter.pdf
any help would be appreciated

Importing a class from another context?

Hi JSP techies,
Im using RESIN and having a simple problem of figuring out how to import classes from another context, if Im using the right word.
ie.
My .jsp files are under $home/resin/doc/test dir. And in the jsp file, I would like to import a servlet class or a plain java class. But the servlet classes and all other classes are located under $home/resin/webapps/project/WEB-INF/classes/a/b/c
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<% page import="a.b.c.*" %>
I get an error saying "a" not found.
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2. How can I make the jsp file import the classes from the servlets class path?
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$home/resin/doc/WEB-INF/classes dir, everything works fine. But thats simply not an efficient way to get around. Could anyone clear my doubts on this regd.?
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Arun

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Post again if you have more questions!

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I hope this is the right forum... appologies if not.
I am wondering how to access classes that are stored on the internet.
I own the domain www.l4eclan.com. I created a package (I think) of classes on it, but I can't figure out how to access the classes in that package.
The url of the package is located at:
Code:
http://www.l4eclan.com/minion
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I tried accessing the class with "import com.l4eclan.minion.*;" and "import com.l4eclan.*;" but neither worked.
Can anyone tell me what I am doing wrong?

So it's not possible for Java to read classes that
aren't stored on the local machine?Not with the import statement.
The whole point of this program is to read classes
stored in that directory on the internet... not to
read them from the local machine.Then you have a problem.

Importing WebService class into Forms10g

Hi ,
I want to import webservice from Jdeveloper in Forms10g.I am using Jdeveloper 10.1.3.4 complaint with JDK 1.4. When I import the class in Forms10g from Jdeveloper it gave me error:
Importing Class Proxy.classes.oracle.srtutorial.datamodel.proxy.SendServiceSoapClient...
Exception occurred: java.lang.UnsupportedClassVersionError: Proxy/classes/oracle/srtutorial/datamodel/proxy/SendServiceSoapClient (Unsupported major.minor version 49.0)
I figured out that this error is due to different versions of JDK used in Oracle Forms10g(JDK 1.3) and Jdeveloper 10.1.3.4(JDK 1.4). So I changed the compile properties in Jdev to 1.3.
After changing this to 1.3 when I import the class the previous error is resolved but I get another error :
Importing Class Proxy.classes.oracle.srtutorial.datamodel.proxy.SendServiceSoapClient...
Exception occurred: java.lang.NoClassDefFoundError: Proxy/classes/oracle/srtutorial/datamodel/proxy/SendServiceSoapClient (wrong name: oracle/srtutorial/datamodel/proxy/SendServiceSoapClient)
Please help how to resolve this.
Regards,
Noman
Edited by: user773433 on Aug 11, 2009 4:33 AM

Hi,
I have tried. The problem is when I make the JAR file in Jdeveloper and Change the class path in Windows. The Jar doesnt shows up in Formgs10g when we import the class. I have tried several times by adding the path of JAR file in windows environment but still it doesnt shows up..
Regards,
Edited by: user773433 on Aug 12, 2009 10:54 AM

Importing the class in Oracle Rules Author Definitions

I created the Dictionary in the Oracle Rules Author.
In the Definitions Page I selected the java fact type.
In the User Classpath i gave the class path of the files.
Then i have to import my class in the Rules Repository.
I am getting the following error.
Cannot perform operation. RUL-01527: Received exception for loadClass. RUL-01016: Cannot load Java class example3.Retiree. Please make sure the class and all its dependent classes are either in the class path, or user specified path. Root Cause: example3/Retiree (Unsupported major.minor version 49.0)
Can any one respond to this query please...

You have to do like the others import. You have to put import and the complete path(with all the packages).
For example:
import mypackage.msgsend;
and if you wouls like to import all the classes of a package use:
import mypackage.*;

Java : Import a class programmatically

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