Using external classes
Hi!
I've a file named XSort.class. It starts with "public class XSort extends Sorter". I've to write a file in which I should call methods of this class. How can I get access to the class? "import XSort.class" doesn't work.
By the way: How can I test how much time a method takes?
Thanks, Chris
in order to access the class if its in a seperate file, you'll have to create a package for it
type in
package XSort;
as the first line of code and stick it in a folder called XSort under your classpath
then just import the class with
import XSort.*;
in the class that needs the methods
Similar Messages
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Use "external" classes as plugins
hi everyone :-)
i have an application which offers some plugins to the user.
now the thing is: the plugins shouldn't be included into my JAR-file, the should be in an external folderstructure outside of the JAR.
when i use the Class.forName(...)-method, i cannot access the external classes... even if i add the package-path of them (i.e. "pluginsp.plugin1.Plugin1")
has anyone an idea how to solve?
thx a lot & regards
manuOSGi is pretty bulky and is a spec. Eclipse is built around OSGi. Perhaps the better implementation is OSCAR, an open-source implementation of OSGi that is more a stand-alone plugin engine like my Platonos Pluginengine is.
Depends on what you want. Small, fast, easy to work with and get up in about 5 mins? Go for mine. If you need something a little more industry standards based but is more complicated to work with and quite a bit bulkier in terms of the library size, go for OSCAR. I am not slamming OSCAR or OSGi. OSCAR is very slick, and OSGi is a great initiative. Just offering another solution that may work out better. -
Using external classes inside an EBJ
Hi! Here's a simple question about EJB's:
I have an EAR file containing a WAR file (WEB-INF/lib, WEB-INF/classes, and all that stuff), and a JAR file. The JAR file contains a MDB. A simple scenary, isn't it?
Well, my MDB uses classes contained in the WEB-INF/classes of the WAR file. The reason why the classes needed by the MDB are in the war file (web-inf/classes) is that the war application also uses that classes.
This trick works in some servers and versions, but fails in other cases.
Now my JBoss 4.02 says:
ClassNotFoundException: No ClassLoaders found for: com.einforma.sfee.peticiones.PeticionFactura
Where this class is shared by the MDB and the WAR app, and is stored in WEB-INF/classes of the war file
Can anybody suggest a workarond to this problem? What should be the 'elegant' way to make this work?Ok, it's solved, i just removed the classes from my
war, made a jar with them, and put the jar into de
ejb. Now both (war and ejb) can access the classes.you have duplicated the class in your application.
A better strategy would be to make a jar of common utilities (which are used by both WAR and EJB classes). Put this in the J2EE server's class path.
Of course, you must ensure that the EJBs and WAR classes dont use some shared resources in those utility classes.
Packaging of your J2EE application is one of the most important tasks.
regards -
How to use external Java API in Java Embedd inside BPEL
How to use external classes inside the BPEL in Java Embed Activity ? Any sample code availble ? Like i want to use log4j API inside BPEL.
No you dont have to change your startManagedServer.cmd/.sh everytime you need to have a Java Embedding activity. You only need it in case of using Log4J. As log4j requires a configuration xml viz log4j.debug.xml and log4j.dtd you need to let the soa managed server know about it. The best way to load this configuration files is using the JAVA_OPTIONS command during server startup.
Hope the explanation helps. -
Working with AS3 External Classes
Ok... trying to work with AS3 external classes. I have a movieClip that I want to also function as a button. Instance name is "_onDemand". This movieClip is on the stage of my Home.fla. "_onDemand" movieClip properties Class:HomePage Base clase: flash.display.MovieClip
I want the user to click this movieClip and take the user to an external URL within a new browser window or tab.
Can anyone help me? Or at least point me to a really really good tutroial that does exactly this using external classes?
Thanks so much,
Mark
My code:
package com.cox4college.pages
import com.gaiaframework.templates.AbstractPage;
import com.gaiaframework.events.*;
import com.gaiaframework.debug.*;
import com.gaiaframework.api.*;
import flash.display.*;
import flash.events.*;
import com.greensock.TweenMax;
import flash.net.URLRequest;
import flash.net.navigateToURL;
public class HomePage extends AbstractPage
public function HomePage()
super();
alpha = 0;
//new Scaffold(this);
override public function transitionIn():void
super.transitionIn();
TweenMax.to(this, 0.3, {alpha:1, onComplete:transitionInComplete});
override public function transitionOut():void
super.transitionOut();
TweenMax.to(this, 0.3, {alpha:0, onComplete:transitionOutComplete});
public class _onDemand extends Sprite
// Link Navigation button handlers
public var _onDemand:Sprite;
// if you want a hand cursor
_onDemand.buttonMode = true;
_onDemand.useHandCursor = true;
_onDemand.addEventListener(MouseEvent.CLICK, onDemandClickHandler);
_onDemand.addEventListener(MouseEvent.ROLL_OVER, onDemandRollOverHandler);
_onDemand.addEventListener(MouseEvent.ROLL_OUT, onDemandRollOutHandler);
public function onDemandClickHandler(e:MouseEvent):void{
navigateToURL(new URLRequest("http://ww2.cox.com/residential/santabarbara/tv/ondemand.cox"));
public function onDemandRollOverHandler(event:MouseEvent):void{
_onDemand.gotoAndStop("hover");
public function onDemandRollOutHandler(event:MouseEvent):void{
_onDemand.gotoAndStop("static");
Getting the following errors:
1120: Access of undefined property _onDemand.Ok. I admit it... I had some wonderful help to resolve this issue. You ever feel like you are on an island learning AS3 External Classes? I feel that way all the time... so far... I plan on not feeling that way soon. I hope this helps someone get off that island.
package com.domainname.client {
import flash.display.*;
import flash.events.*;
import flash.net.*;
import flash.utils.*;
import caurina.transitions.Tweener;
import caurina.transitions.properties.*;
FilterShortcuts.init();
ColorShortcuts.init();
public class Main extends MovieClip {
private var coverDelay:Number = 4;
//#DF6D27
public function Main():void {
initMain();
private function initMain():void {
mc_form.visible = false;
Tweener.addTween(mc_cover,{alpha:1,time:1,delay:coverDelay,onComplete:formIn});
btn_onDemand.buttonMode = true;
btn_listings.buttonMode = true;
btn_ppv.buttonMode = true;
btn_rhapsody.buttonMode = true;
btn_onDemand.addEventListener(MouseEvent.MOUSE_OVER,navOver);
btn_onDemand.addEventListener(MouseEvent.MOUSE_OUT,navOut);
btn_onDemand.addEventListener(MouseEvent.CLICK,navClick);
btn_listings.addEventListener(MouseEvent.MOUSE_OVER,navOver);
btn_listings.addEventListener(MouseEvent.MOUSE_OUT,navOut);
btn_listings.addEventListener(MouseEvent.CLICK,navClick);
btn_ppv.addEventListener(MouseEvent.MOUSE_OVER,navOver);
btn_ppv.addEventListener(MouseEvent.MOUSE_OUT,navOut);
btn_ppv.addEventListener(MouseEvent.CLICK,navClick);
btn_rhapsody.addEventListener(MouseEvent.MOUSE_OVER,navOver);
btn_rhapsody.addEventListener(MouseEvent.MOUSE_OUT,navOut);
btn_rhapsody.addEventListener(MouseEvent.CLICK,navClick);
function navOver(evt:MouseEvent):void {
Tweener.addTween(evt.target,{_color:0xffc614,time:.2});
function navOut(evt:MouseEvent):void {
Tweener.addTween(evt.target,{_color:0xffffff,time:.2});
function navClick(evt:MouseEvent):void {
var url;
switch (evt.target.name) {
case 'btn_onDemand':
url = new URLRequest("http://ww2.cox.com/residential/santabarbara/tv/ondemand.cox");
break;
case 'btn_listings':
url = new URLRequest("http://ww2.cox.com/myconnection/santabarbara/watch/entertainment/tv-listings.cox");
break;
case 'btn_ppv':
url = new URLRequest("http://ww2.cox.com/residential/santabarbara/tv/pay-per-view.cox");
break;
case 'btn_rhapsody':
url = new URLRequest("http://ww2.cox.com/myconnection/santabarbara/listen.cox");
break;
navigateToURL(url,"_blank"); -
Trouble Using DataProvider in External Class
Hello,
I am creating a Flash form which will include a drop-down selection menu from which a user may choose their state. I originally accomplished this by adding a ComboBox to the stage and then populated the ComboBox's DataProvider object with an XML listing of all the state names and the corresponding values. Everything works as expected.
I have decided, however, that it would make the most sense to create an external class to accomplish the same thing. I have attempted to create such a class using the following code:
package {
import fl.data.DataProvider;
import fl.controls.ComboBox;
public class StateSelectionList extends ComboBox {
private var xml:XML;
private var dp:DataProvider;
private var cb:ComboBox;
public function StateSelectionList() {
xml = <states>
<state name="AL - ALABAMA" value="AL" />
<state name="AK - ALASKA" value="AK" />
<state name="AZ - ARIZONA" value="AZ" />
</states>;
dp = new DataProvider(xml);
cb = new ComboBox();
cb.dataProvider = dp;
cb.labelField = "name";
I then attempted to use this class in my Flash file by adding a ComboBox component to my library and then by creating a new StateSelectionList object and adding it the stage using the following code:
var states:StateSelectionList = new StateSelectionList();
addChild(states);
The data provider for the new object is empty, however, as one can find by tracing the length of the object's dataProvider property;
trace(states.dataProvider.length);
I am new to creating external class files so I am not sure why the new object is not populated with any data. Thanks in advance for any suggestions.
P.S. Please feel free to download the complete XML file I created for the states. The file includes all US states and possessions, US military states, and Canadian provinces and territories. http://windhorsemedia.com/private/states.xmlThere is a something tricky:
first if you extend the combo box ther is no need to create a new instance in its constructor only to pass the data provider. This will work
var xml:XML =<states>
<state name="AL - ALABAMA" value="AL" />
<state name="AK - ALASKA" value="AK" />
<state name="AZ - ARIZONA" value='AZ' />
</states>;
dataProvider=new DataProvider(xml);
dataProvider is public from base class ComboBox so you can access it anytime. But the properties that are inspactable may be setted with effect only after second frame is passed so try this
public class StateSelectionList extends ComboBox {
public function StateSelectionList():void
addEventListener( Event>ENTER_FRAME, onsecondFrame, false, 0, true )
private function onsecondFrame( evnt : Event ): void
removeEventListener( Event>ENTER_FRAME, onsecondFrame
var xml:XML =<states>
<state name="AL - ALABAMA" value="AL" />
<state name="AK - ALASKA" value="AK" />
<state name="AZ - ARIZONA" value='AZ' />
</states>;
dataProvider=new DataProvider(xml);
labelField="name";
Note, In my custom components when I extend the UIComponent a set the parameter in afterComponentParameters or CreateUI( I think this was the name ) methods but more fast is just to pass one frame and set the parameturs -
Execute an external program using Runtime class
How to execute an external java program using Runtime class?
I have used ,
Process p=Runtime.getRuntime().exec("c:/j2sdk1.4.0/bin/helloworld.java ");
But it throws a runtime IOException error:2 or error:123.
Help me with the code. Thanks in advance.Create Runtime Object and attach to system process.Try this code
import java.io.*;
public class ExecuteExternalApp {
public static void main(String args[]) {
try {
Runtime rt = Runtime.getRuntime();
//Process pr = rt.exec("cmd /c dir");
Process pr = rt.exec("c:\\ yamessenger.exe"); //give a valid exe file
BufferedReader input = new BufferedReader(new InputStreamReader(pr.getInputStream()));
String val=null;
while((val=input.readLine()) != null) {
System.out.println(val);
int exit = pr.waitFor();
System.out.println("Exited with error code "+exit);
} catch(Exception e) {
System.out.println(e.toString());
e.printStackTrace();
}Edited by: anishtomas on Feb 3, 2009 9:34 PM
Edited by: anishtomas on Feb 3, 2009 9:37 PM -
How do I write an external class with global constants?
Hi you all !
First I want to explain what exactly I want to do:
I have an application that should run in different resolutions. The app runs fullscreen, and I don't use Layouts or something, just a single Frame with a Graphics Object.
Now to handle the different resolutions, I want to write an external class with some constants to use. The usage in my main Class should be something like this:
public
class blah
private Constants myConstants;
public blah()
if (highResolution)
myConstants = new hiResConstants();
else
myConstants = new loResConstants();
System.println(String.valueOf(myConstants.SCREEN_WIDTH);
}or somthing like that. The important fact is that I can choose the constants at runtime and that I am NOT forced to use methods to get the values, cause something like
System.println(String.valueOf(myConstants.getScreenWidth());sux if you have methods using 5 or more parameters.
Anybody out there who understood my problem and can help me??? PLEASE?
best regards,
SkippyFirst, what's so much worse about
System.println(myConstants.getScreenWidth());
than
System.println(myConstants.ScreenWidth);
Is the extra five characters really that bad? (Note
you don't need the String.valueOf method call.)Well actually it was a wrong example I gave here, but it's not the call that makes me shake but the implementation:
public int screenWidth = 1024;vs.
public
int getScreenWidth()
return 1024;
}Here it makes a bigger difference, even when you think of managing about 100 or even more constants.
Second, why do you have methods that take five or more
parameters!?Well, maybe this example show up what I mean:
if (cursorIsInArea(100,100,200,200,areaId))
doSomeStuff();Ok, I could use Rectangles here, but if you think of the timing here (I draw 30 frames / sec and this check comes about every frame or the animation would be choppy) I refuse to create an Object everytime I make this call.
Btw: Is it worth thinking about the time of execution like I did in this example? OO is a neat thing, but is it that fast?
I don't think isCursorInArea(new Rectangle(100,100,200,200),areaId) is such a great idea, but I might be wrong.
It sounds like you're trying to compound a bad design
with an even worse design for no good reason!Well, I'm not that experienced Java programmer to judge about that, but I (and my profs at university too) found my codes well structured and designed so far.
Skippy
PS: the string.valueOf(123) call came from cut&paste:
system.out.println(string.valueOf(number1)+string.valueOf(number2));Try this without the function.... ;-) -
Problem in creating EJB and WebService using complex class structure
Hi All,
My requirement is like :
I have a class with very complex structure.
I have also used external .jars.
Now when I have created an EJB with a method's return parameter as above class.
But when I am creating a Webservice, it doesnot allow me to select this method.
Not able to configure why ?
Please Help.
Thanks.Hi,
I have gone through your code and the problem is that when you create jar it takes a complete path address (which is called using getAbsolutePath ) (when you extract you see the path; C:\..\...\..\ )
You need to truncate this complete path and take only the path address where your files are stored and the problem must be solved. -
Needs help.....Please about using different classes
I don't know how to use differenet classes.
Please tell me how to write class to suit Start. This stuff me up. Please .... help me
<<My program>>
//Start
public class Start
{ private Artist[] Artists;
private Record[] records;
private Person[] Manager;
private TextMenu makeMenu = new TextMenu();
public static void main(String[] args)
Start studio = new Start();
studio.menu();
public Start()
{ //Person.Manager(ManagerName,HouseNumber,StreetNumber,PhoneNumber)
Manager = new Person[1];
Manager[0] = new Person("Yangfan",88,"Young ST",11118888);
//Artist(GroupID,ArtistName,HouseNumber,StreetNumber,PhoneNumber)
Artists = new Artist[5];
Artists[0] = new Artist(1,"Backstreet Boys",58,"Music ST",99998888);
Artists[1] = new Artist(2,"Santana",68,"Music ST",99998899);
Artists[2] = new Artist(3,"Macy Gray",78,"Music ST",55558888);
Artists[3] = new Artist(4,"Ricky Martin",88,"Music AVE",77778888);
Artists[4] = new Artist(5,"Did Rock",55,"Music Road",66667777);
//Record(RecordingID,RecordName,Artist,StartTime,FinishTime,RecordingDate,GuestArtist1,GuestArtist2)
records = new Record[6];
records[0] = new Record(1,"I want it that way",Artists[0],11,12,"05/08/2001",Artists[1],Artists[3]);
records[1] = new Record(2,"Smooth",Artists[1],11,12,"05/08/2001",Artists[1],"");
records[2] = new Record(3,"Do something",Artists[2],11,"05/08/2001",Artists[3],"");
records[3] = new Record(4,"Livin La Vida Loca",Artists[3],11,12,"05/08/2001",Artists[1],Artists[3]);
records[4] = new Record(5,"Bawitdaba",Artists[4],11,13,"05/08/2001",Artists[1],"");
records[5] = new Record(6,"The one",Artists[0],11,14,"05/08/2001",Artists[1],"");
public void menu()
{ String[] choices = {">>>List Manager Details",">>>List All Artist Names",">>>List An Artist Telephone-Number",">>>Show Details For One Recording",">>>Add A New Recording",">>>List The Recording Costs For All Artists",">>>List Artist's Reocording",">>>Exit Program"};
while (true)
{ switch (makeMenu.getChoice(choices))
{ case 1: showAllArtists();
break;
case 2: showAllRecords();
break;
case 3: System.exit(0);
break;
case 4: System.exit(0);
break;
case 5: System.exit(0);
break;
case 6: System.exit(0);
break;
case 7: System.exit(0);
break;
case 8: System.exit(0);
break;
default:
public void showAllArtists()
{ int numArtists = Artists.length;
for(int i = 0; i < numArtists; i++)
{ Artists[i].displayArtistDetails();
public void showAllRecords()
{ for (int i = 0; i < records.length; i++)
{ System.out.println();
records.printRecordDetails();
<<Assignment>>
Due - midnight, Wednesday August 22nd
This assignment will test your knowledge of Java programming using classes, encapsulation and javadoc.
The base requirements
Write a complete Java class to manage a Digital Recording Studio. The studio wants to keep a list of all Artists that use the studio and also wishes to keep track of all Recordings that have been made. An important function of the program is to calculate the time spent making a recording and charge the Artist for the time used.
You must create at least the following classes, Start, Studio, Person, Artist, Recording, Address. You may create other classes if needed as well
Start will contain main(), create one instance of a Studio and execute a Menu of commands to test your code. Studio should contain a studio name, an array of Artist and an array of Recording plus the studio manager (a Person). Each Artist should contain the name of the group and an Address. Each Person will have a name and a home address. Each recording will have a Title (usually song title), an Artist (only one), and a list of guestArtist (they are Artist�s but will not receive royalties) the number of the CD the recording is stored on (numbers are numerical and recordings are saved on CD-R), plus the recording start and finish times for the recording session (suggest you use Java Date class � refer to the API). An Address will contain, house number (integers only), a street name and a telephone number. There is no need to store city and country.
To enter a set of data for testing your program � main() should call a method in the Start class that will fill in a set of values by creating objects and filling in values by calling methods in each class. This is the ONLY method allowed to be longer than 1 page long � normally we would read the data from a file but there are no O-O principles that can be learnt with simply filling in data values. It is suggested to create say at least 4 Artist�s and 6 Recordings (at least one with 1 guest Artist and one with 2 guestArtist�s)
A menu for testing your program should be provided (it is suggested to put the Menu into a separate class as you need at least 3 menus). While other commands are possible, only the following ones will receive marks.
Menu commands needed are
List the Managers name, address and telephone number
List all Artist Names
List an Artist telephone number (a sub menu showing valid Artist�s is required)
Show all details for one Recording ( sub menu of valid Recordings will be needed and remember there can be more than one guestArtist)
Add a new Recording, user will need to be prompted for all details.
List the recording costs for all Artists � show each Artist on a separate line with their name and total amount, charge for using the studio is $1000 per hour or part thereof, example for a 1 hour and 10 minute recording the Artist will be billed for 2 hours.
List all the Recording�s one Artist has worked on (sub menu of Artists needed), the list should show whether they were the Artist or a guestArtist
Exit program
Use fixed sizes for arrays, suggest 20 is suitable for all arrays. Java can handle dynamic data structures (where the number of elements can grow or shrink), but that is beyond a first assignment.
Do NOT make ANY methods static - this defeats the Object Oriented approach and will result in ZERO marks for the entire assignment.
Data MUST be encapsulated, this means that all the data relating to an object are to be stored INSIDE an object. None of the data detail is to be globally available within your program - hence do not store Artist names in either Studio or Recordings � just store a reference instead. Do NOT create ID numbers for Artists, you should use References instead � for many students this will be the hardest part as you have to use Objects, not program in a C style to solve the problem. Note that if there are any non-private data in classes then zero will given for marks for encapsulation.
Good programming style is expected (see web page or lecture notes). In particular, you must use javadoc to generate a set of html pages for your classes. Make sure you use the special javadoc style comments in your source code. Marks will be granted for both using javadoc and also for including sensible javadoc comments on each class and each public method.
What to Hand In
Read the turnin page, basically the .java files, a readme.txt to tell the marker which file the program starts from plus the javadoc (html) files. Do NOT send .class files (if you do send these we will delete them and recompile your program), do NOT compress with gtar, tar, zip or use any other tool on your files. Turnin automatically compresses all your files into a single archive for us to mark.
The simplest way to turnin all your files is to place all files in one directory then just use the *.* wildcard to turn in all files within that one directory.
You must turnin all files that are not part of Java 1.3. In particular, you are allowed (actually encouraged) to use EasyIn or SavitchIn but should include the one you use in the files you submit. It is STRONGLY suggested that you copy all the files into another directory, test it works there by compiling and executing then turnin files from that directory. A common problem is students adding comments at the last minute then not testing if it still compiles. The assignment will be marked as submitted � no asking later for leniency because you added comments at the last minute and failed to check if it still worked.
If the tutors are unable to compile your submission, they will mark the source code but you will lose all the execution marks. Sorry, but it is your responsibility to test then hand in all files.
Comments
For CS807 students, this program should be fairly easy if it was to be programmed in C (you would use several struct). The real art here is to change over to programming objects. Data is contained in an object and is not global. This idea is essential to using Java effectively and is termed encapsulation. Instead of using function(data), you use objectName.method( ). Effectively you switch the data and functions around, the data has a method (function) attached to it, not the other way around as in C (where you have a function and send data to it).
While there will be some marks for execution, the majority of the marks will be given for how well you write your code (including comments and documentation) and for how well you used O-O principles. Programs written in a C style with most of the code in one class or using static will receive ZERO marks regardless of how well they work.
You are responsible for checking your turnin by reading the messages turnin responds with. Failure to read these messages will not be an acceptable excuse for submitting an incorrect assignment. About 2% of assignments sent to turnin are unreadable (usually empty) and obtain 0.
Late submissions
Late submissions will only be accepted with valid reasons for being late. All requests for assignment extensions must be made via email to the lecturer. Replies for acceptance or refusal will made by email. Instant replies are unrealistic (there is usually a flood of queries into my mail box around assignment due dates) and the best advice is to ask at least 4 days in advance so that you will have a reasonable chance of getting a timely reply and allow yourself enough time to submit something on time if the extension is not granted.
ALL late submissions will be marked LAST and will NOT be sent to tutors for marking until all other assignments have been marked. As an example, if you submit late and your assignment is not yet marked by the time assignment 2 is due then it will be pushed to the end of the marking pile as the assignments that were submitted on time for assignment 2 will take priority.
If you make a second submission after the submission date, only the first submission will be marked. We will not mark assignments twice! You can update your submission BEFORE the submission date if you need to - this will just overwrite the first submission. The latest time for a late submission is 5pm on the Wednesday after the due date. This is because, either a solution will be handed out at that lecture or details of the assignment will be discussed at the lecture. I cannot accept any assignment submissions after that time for any reason at all including medical or other valid reasons. For those who are given permission to be later than the maximum submission time � a different assignment will be handed out. Remember, if you decide to submit late you are VERY UNLIKELY to receive feedback on your assignments during semester.
Assignments will be removed from turnin and archived elsewhere then forwarded to tutors for marking on the morning after the assignment is due. A different tutor will mark each of your assignments � do not expect the tutor you see at the tutorials to be your marker.
Marks will be returned via email to your computer science yallara account � ideally within 2 weeks. I will send marks out when I receive them so do not send email asking where your marks are just because a friend has theirs. If you want your email forwarded to an external account, then place a valid .forward file into your yallara account. The Help Desk on level 10 can assist you in setting this up if you do not know how to do it.I have seen other people who have blatantly asked for
other people to do their homework for them, but you
are the first person I've seen to actually cut and
paste the entire assignment as it was handed to you.
Amazing.
Well, unlike some of the people you're talking about, it seems like zyangfan did at least take a stab at it himself, and does have a question that is somewhat more sepcific that "please do this homework for me."
Zyangfan,
marendoj is right, though. Posting the entire assignment is kind of tacky. If you want to post some of it to show us what you're trying to do, please trim it down to the essential points. We don't need to see all the instructor's policies and such.
Anyway, let me see if I understand what you're asking. You said that you know how to write the code, but only by putting it all in one class, is that right? What part about using separate classes do you not understand? Do you not know how to make code in one class aware that the other class exists? Do you not know how code in class A can call a method in class B?
Please be a bit more specifice about what you don't understand. And at least try using multiple classes, then when you can't figure out why something doesn't work, explain what you did, and what you think should have happened, and what did happen instead.
To get you started on the basics (and this should have been covered in your course), you write the code for two classes just like for one class. That is, for class A, you create a file A.java and compile it to A.class. For class B, you create a file B.java and compile it to B.class. Given how rudimentary you question is, we'll skip packages for now. Just put all your class files in the same directory, and don't declare packages in the .java files.
To call a method in class B from code that's in class A, you'll need an object of class B. You instantiate a B, and then call its methods.
public class B {
int count;
public B() { // constructor
public void increment() {
count++;
public class A {
public static void main(String args[]) {
B b = new B();
b.increment();
}Is this what you were asking? -
Using External JARs in a Web Dynpro Project
Hi,
I'm having some difficulties building and deploying a Web Dynpro application that uses the Apache JaxMe libraries. We're using SP11 of Developer Studio and WebAS and we're using JDI Scenario 2+ for building and deployment. Thus far here's the procedure I followed:
1) Created a DC of type "External Library"
2) Added the necessary jars to the "libraries" folder of the External Library DC project (the jars that I added were jaxme2-rt.jar, jaxme2.jar, jaxmeapi.jar, jaxmejs.jar, jaxmepm.jar, jaxmexs.jar, xercesImpl.jar, xml-apis.jar all of which were pulled from the Apache JaxMe implementation download)
3) For each of the jars in the libraries folder I right-clicked, selected Develoment Component then clicked "Add to public part"
Then after reading this note:
https://websmp206.sap-ag.de/~form/sapnet?_FRAME=CONTAINER&_OBJECT=012006153200000038152005
I created a J2EE Library Component DC following these steps:
1) Created a new DC of type J2EE Server Component / Library
2) Added the External Library DC that I had just created as a "Used DC"
3) Edited the DC so that it is used a Build Time and Run Time
Finally I went to the Web Dynpro application and included the J2EE Library Component DC as a Used DC at build time and run time.
I was able to build all of the project successfully (doing a DC build for each) then I was able to succesfully deploy the applications to my local development WebAs (by doing a DC deploy for both the J2EE Server Component and the Web Dynpro application) The problem is that at runtime the Web Dynpro application cannot find the external libraries. For example, I receive the following error when running the application:
java.lang.NoClassDefFoundError: javax/xml/bind/JAXBException
The "missing" class is included in one of the jars but for some reason these jars are not accessible to Web Dynpro at runtime.
Any help you can provide on this problem is very much appreciated.
Thanks in advance!
JasonI created the <b>JAR</b> with the following class (structure):
<b>com.sap.tc.webdynpro.tests.utils.TableSorter.class</b>
I have followed the steps that was suggested in the forum:
==========================================================
1) creating an Extneral library DC
2) import the JAR "com.sap.tc.webdynpro.tests.util.jar" to the libraries folder of the External Library DC project
3) Right-click on the JAR imported to the project and add them to the public part.
This DC is now ready to be used as a build-time reference that will allow CBS to build the "main" Web Dynpro application that will use the external libraries. Next, we have to create a new Web Dynpro DC to hold the class files here are the steps:
1) Create a new Web Dynpro DC
2) Create a new public part, selecting the "Can be packaged into other build results" option
3) Rename the JARs as Zip files and extrct the full content (folders and class files) to your root folder
4) Import the folders and files to the src/packages folder
5) Expand the public part node that was created and select the "Entities" node, right-click it and choose Edit
6) In the Entity Type list select the "Folder" option then in the selected entities tree pick each of the folders that you imported in step 5 (above)
7) Now do a DC build and a DC deploy of the project
Then check-in, activate, and release any activities you have associated with creating these two projects. In the DC perspective, refresh the Active DCs and Inactive DCs to ensure that both new DCs appear in the Active list. Now we have to setup the references to these DCs in our main Web Dynpro application. To do this, follow these steps:
1) Open the Web Dynpro perspective and right click the Used DCs node then choose "Add Used DC.."
2) Pick the public part of the External Library DC that we created (first) and set it to have a Build Time dependency
3) Again, right click the Used DCs node and choose "Add Used DC.." then choose the public part of the Web Dynpro DC that we created and give it a Run Time dependecy (weak) and click finish.
4) Now, due to what I think is a bug. You must right click on the Web Dynpro "used DC" that you just added in the previous step, and set the run time dependency again (it seems to revert to the default values for some reason)
5) Now do a DC build and a DC deploy on the "main" web dynpro application.
6) Check-in, activate, and release any activities associated with adding these references and then others on your team may use the classes in the external libraries within the Web Dynpro project.
However, when I executed, the following exception occurred:
===========================================================
Error stacktrace:
java.lang.<b>NoClassDefFoundError</b>: <i>com/sap/tc/webdynpro/tests/utils/TableSorter</i>
at br.com.embraer.materiais.zdplmm001.view.Zdplmm001_0500View.wdDoModifyView(Zdplmm001_0500View.java:138)
<b>What's missing????</b>
Thanks
Robson Lima
Sao Paulo - Brazil -
Using external libraries in Web Dynpro DCs
Hi,
I've followed the example in the following blog for using external libraries in my Web Dynpro (WD) DCs:
/people/valery.silaev/blog/2005/09/14/a-bit-of-impractical-scripting-for-web-dynpro and some other messages in the forums. However, it isn't working exactly as described in the blog. I have to twist it a bit to get it work. I were wondering if anyone has any better solution for this problem?
The senario is like this:
- External libraries: a.jar, b.jar
- WD DCs: wd1, wd2 in that wd1 and wd2 are both using external libraries a.jar and b.jar; wd1 is a library DC that can be reused in wd2.
According to the example in the blog, the following steps are carried out:
- Step 1. Create an external library DC, add a.jar and b.jar to public part "ExternalLibs" as described in the blog.
- Step 2: Create, build, deploy J2EE Server / Library DC. (Add reference to the public part of the external library DC as a used DC, with both Build-time and Run-time dependency).
- Step 3: Create WD DC wd1, add used DCs and WD reference libraries as described in the blog. Add WD components as public part. Build and deploy WD DC wd1.
All are ok so far!
- Step 4: Create WD DC wd2, add used DCs and WD reference libraries as before. Try to build and FAIL!
The error occurs here because wd2 cannot access to the classes in the external libraries, similar to the problems described in thread Re: Problems with deploying a JAR file.
I've found a workaround, although quite tedious and cumbersom, but it works. My solution so far is:
- Round 1: Perform those 4 steps above, but in step 1, after adding the jars to the public part "ExternalLibs", set the property of the public part "purpose" to "compilation", then build and deploy all other DCs accordingly.
- Round 2: Change the public part "ExternalLibs" property to "assembly", then bulid and deploy all other DCs again.
And now I can reuse the external libraries in my WD DCs as well as WD DCs as library in other WD DCs.
I know it's not an elegant solution. So I were wondering if the experts out there can help me with better solutions?
Many thanks in advance for your help.
Regards,
Van
Edited by: Van Hai Ho on Dec 18, 2007 3:30 PM
Edited by: Van Hai Ho on Dec 18, 2007 3:31 PMHi Pascal,
Thank you so much for your help. Your suggestion has helped to make my life a lot easier.
Regards,
Van -
How to use ScriptList class in Indesign CS5 SDK?
Hi,
Can anyone help to this concern??...
I couldn't use ScriptList class in CS5 SDK, as we use in Indesign CS4. It throws the following error when I build my plug-in.
Error 1 error LNK2001: unresolved external symbol "__declspec(dllimport) struct adobe::version_1::new_delete_t const adobe::version_1::local_new_delete_g" (__imp_?local_new_delete_g@version_1@adobe@@3Unew_delete_t@12@B)
Here follows the Code I used to apply script label to a pageItem.
ErrorCode err=kFailure;
InterfacePtr<IScript> iScript(argPageItemUIDRef, UseDefaultIID());
ScriptList myScriptList; // including this class throws the above error.
myScriptList.push_back(iScript);
IScriptLabel::ScriptLabelValue myTagValue(argLabel);
InterfacePtr<IScriptManager>scriptMgr(Utils<IScriptUtils>()->QueryScriptManager(kScriptTa gMgrBoss));
err=Utils<IScriptUtils>()->SetScriptingTag(myScriptList,scriptMgr->QueryDefaultEngine()->GetRequestContext(),myTagValue);
return err;
with thanks,
Praba2i_Geert wrote:
People who are still having problems with this should add the "AslSupport.lib" to the additional dependencies in the linker settings (Visual Studio).
Thanks, it helped me -
Debugging in "strict mode" while using external library assets
Hi everyone. A new ActionScript-3 user here with a question on strict mode.
I have multiple Flash pages which use the same art assets. To support modularity and possibly decrease total download time, I have implemented this by placing the shared assets into the library of a shared .swf file (the other .swf files all load this shared .swf file). The shared .swf contains ActionScript routines to place instances of the assets onto the stage and to perform other common functionality.
A drawback to this strategy is that, correct me if I'm wrong, "strict mode" can not be used to debug calls to functions which exist in external .swf files. That is, if the parent .swf makes a call to a function which is defined within an externally loaded .swf, that function call will be reported as an error in strict-mode because Flash is unaware of the contents of an external .swf at compile time (though it is aware at run-time.)
My understanding is that shared code can be compiled under strict-mode if the shared code exists purely as an external .as file, not as an external .swf file. However, again please correct me if I'm wrong, art assets which are shared at run-time must exist in an external .swf file. Therefore, by my understanding, if run-time shared assets are desired, then strict mode will not properly compile the projects.
Is my understanding correct?
Thanks for any help,
- RashidPosting an update.
I have since found a way to compile in strict mode a project which loads an external .swf and acesses its functions. This external swf is able to have a library of its own which is accessed in the external swf's own ActionScript.
Unfortunately, the solution I have found increases the size of the project's compiled swf. If anyone knows of a way to solve this problem without increasing swf size, I would be quite grateful if you were to share your knowledge.
Posted below is the solution I am aware of, which increases file size. In these steps, “main project” refers to the top-level Flash project which is attempting to load other swf's. “External project” refers to an swf which is to be loaded by the main project.
1) Publish the external projects as swc files. “Swc” is a class file, and is to be accessed by the main project when debugging under strict mode. The .swc presumably contains information about external project's library items which are to be exported for ActionScript.
To create an .swc file, head to “File->Publish Settings...->Flash”. Check the “Export SWC” box.
2) In the main project, add the external projects' .swc files to the external library path. This is found in, “File->Publish Settings...->Flash->Settings->External library path”. Either individual swc files can be added here (via the SWC file button) or the name of the directory where they reside (via the Path button). Both approaches should work.
3) Somewhere in the main project's ActionScript, the external project is likely being loaded via a line of code similar to myLoaderObject.load( myURLRequest ). For this new approach, it is now necessary to make use of the second parameter to load(), the loader context. Here's the new line of code:
myLoaderObject.load( myURLRequest, new LoaderContext( false, ApplicationDomain.currentDomain ) );
If the LoaderContext parameter is NOT passed, then Flash unfortunately shall not report this as an error. Instead, you may observe strange behavior when the external swf attempts to use its exported library items.
4) If the main project's code refers to the external project's class by name, then that class will need to be “import”ed into the main project's code. Without this, the compiler will complain about not recognizing the class.
5) In the main project, edit “File->Publish Settings...->Flash->Settings->Source path”. Add the path to the external project's .as class file. Without this, the main project shall give a run-time error of not being able to find the external class.
This final step, 5, is what increases the size of the main project's swf. I have a project with a few nested .swf loads, and the main project's swf increased by about 10Kb when using this solution.
This does not seem proper. That is, one would desire the sizes of the final swf's to remain unchanged regardless of the level of compile-time error reporting. If my interpretation of an .swc class file is correct, then it seems logical to presume that step 5 above should not even be necessary, because the class information is given to the compiler/debugger through the .swc.
Anyone know what I am doing wrong, or otherwise how to get around this problem?
Thanks bunches. -
Message Transformation Bean - Usage of external classes
Hi SDNers,
I am planning to write an external Java class to be loaded from AF_Modules/MessageTransformBean . The idea is simple, I want my class to handle an extra level of hierarchy in FCC process. I know writing the Java class which is as generic as the one provided by SAP is too complex. But I just want it for some specific requirements, so I dont intend to make it as a generic class.
Should the external class that I write implement the interface Transform? If so, what is the jar file that contains this interface and where can I find this jar file in my XI installation?
Also, what is the jar file that contains the standard class com.sap.aii.messaging.adapter.Conversion that gets loaded by default while using the MessageTransformBean?
If you have already tried with similar requirements, please share your experience on the same.
Thanks
JaishankarYou can use the same module in J2SE and J2EE adapter without change.
I recommend to install a J2SE adapter engine on a local PC for testing.
I have found a sample code from previous tests:
package sample;
import com.sap.aii.messaging.adapter.Parameter;
import com.sap.aii.messaging.adapter.trans.Transform;
import com.sap.aii.messaging.adapter.trans.*;
import java.io.*;
public class MyModule extends Transform {
Parameter parameter;
String filename;
public void init(TransformConfig config) throws TransformException{
super.init(config);
parameter = (Parameter) config.getParameters("Parameter");
filename = (String) parameter.get("filename");
// obligatory method service
public void service(TransformRequest request, TransformResponse response) throws TransformException {
// Get the input stream for request message
InputStream in = (InputStream) request.getMessage();
// Get output stream for response message
OutputStream out = (OutputStream) response.getMessage(Transform.MT_OutputStream);
try{
execute(in,out);
} catch (Exception e) {
throw new TransformException("TransformException: Error converting Message " + e.getMessage(), e);
public void execute(InputStream in, OutputStream out) throws Exception{
String filename = (String) transformConfig.getParameters("FileName");
if (filename == null){
filename = "notfound.txt";
// open file stream
OutputStream fileOut = new FileOutputStream(new File(filename));
// copy input stream to output stream and to file
int c;
while ((c = in.read()) != -1) {
fileOut.write(c);
out.write(c);
// main Methode, for local testing. A local XML file is expected.
public static void main (String[] args) {
try {
// Define Input stream and output stream from file
InputStream in = new FileInputStream(new File("source.xml"));
OutputStream out = new FileOutputStream(new File("target.xml"));
// call Mapping
MyModule map = new MyModule();
map.execute(in,out);
} catch (Throwable t) {
t.printStackTrace();
System.exit(0);
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