How to set OPTS when running a jar

java -Xms60M -Xmx60M -XX:OnError -XX:+HeapDumpOnOutOfMemoryError -XX:HeapDumpPath=/home/userX/outofmemory.log -jar RunThis.jar
i get Unrecognized VM option 'OnError'
Could not create the Java virtual machine.
when running the above statement. i'm using jre6

OnError requires that you actually specify for it to do something when an error occurs.
XX:OnError="<cmd args>;<cmd args>"
[http://java.sun.com/javase/technologies/hotspot/vmoptions.jsp#BehavioralOptions]

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How to set variable to run java and j2ee

how to set variable to run java and j2ee

Please ask a specific and comprehensible question. Consider describing with less vagueness the actual current problem that you are encountering.

"Could not find the main class" when running a jar

Hi, I'm trying to create and run a jar from my application, but I can't figure out how to properly set an entry-point. Looking at the Java Tutorials http://java.sun.com/docs/books/tutorial/deployment/jar/index.html I still can't get it to work.
I have a directory myApp, which contains a directory images and some class files, including mainClass.class. I also have a manifest Manifest.txt in the directory myApp with the following line:
Main-Class: mainClass.class
+ one empty line
I create a jar successfully, while inside the myApp directory, with the following command:
jar cfm myApp.jar Manifest.txt *.class images\*.*
I then proceed to run the jar with the following command:
java -jar myApp.jar
and receive the following error:
Exception in thread "main" java.lang.NoClassDefFoundError: myApp/class
My completely uneducated guess is that there is something wrong with my manifest. The tutorial says that the line should be:
Main-Class: MyPackage.MyClass
I'm assuming that I get the error because I didn't specify a package, which I didn't do because I didn't know what to put there. Do I even have a package?
Can anyone tell me what I've done wrong? thanks.
Message was edited by:
SmurfZG

One problem is you are specifying a file name instead of a class name. It probably should beMain-Class: mainClassA good test is to run your app before jaring it - if you run it with "java mainClass" then the Main-Class attribute must be mainClass.
Also class naming conventions say that class names should start with a capital letter - MainClass for example. It is just a convention, but it is easier to get help when you follow conventions.

Class not being created when running from jar

Hi all,
Tech info first:
IDE: Sun Java Studio Enterprise 8
Plaform: windows xp
I have created a Swing app, that connects to a com port(using the RXTXcomm). now, when I run the app in the IDE, everything is fine and dandy, but, when I run the jar file, the application loads, but the class in the app which deals with the com port is not created. here is the code:
    private static void createAndShowGUI() {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);
        Main receiver = new Main();
        receiver.getPropertiesFromFile();
        //Create and set up the window.
        frame = new JFrame("R�FILOG RFID Empf�nger");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setContentPane(receiver.mainPanel);
        frame.setJMenuBar(receiver.createMenuBar());
        frame.addWindowListener(receiver);
        frame.setLocationByPlatform(true);
        //Display the window.
        frame.pack();
        frame.setVisible(true);
        portListener = new RFIDReaderComm(receiver, "COM3");
        portListener.getConfiguration();
    public static void main(String[] args) {
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        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
portListener in the createAndShowGUI() function is an interface level parameter and is the class that is not being created. There is no error message.
If I move the two lines that deal with the port listener before the frame.pack() line, then the GUI is not even loaded, and when I view the processes in the task manager, the process starts and then quits without anything becoming visible. So from this I guess there is a problem with creating the class when running from a jar, but without any error messages, I have not a clue where to start...can anyone help?
thanks in advance.

Well, some more info, so maybe someone can come up with some tips for me...this is really important, and any help is greatly appreciated.
This is obviously a classpath problem. After running the my jar file with java -jar I finally got the error NoClassDefFoundError
Kind of obvious I suppose. But, I cannot seem to get the two jar files I need into the classpath. I have tried the following:
Updating my computers CLASSPATH with the relevant paths - not working
Trying to get the Sun Java Studio Enterprise to build the required jar files into the final package - cannot get this to work
Tried updating the manifest.mf in the following way:
Created a text file Manifest.txt with the lines:
Class-Path: RXTXcomm.jar
Class-Path: BrowserLauncher2-10rc4.jar
ran the command (in the same directory as Manifest.txt):
jar cfm RUFILOGScanner.jar Manifest.txt classes/*.class
but this does not work either. When I run: jar tf RUFILOGScanner.jar all I get is:
META-INF/
META-INF/MANIFEST.MF
classes/
classes/CRCCalculator.class
classes/Main$1.class
classes/Main.class
classes/RFIDReaderComm.class
classes/URLDialog$1.class
classes/URLDialog$2.class
classes/URLDialog.class
the classes I want added are not there. Plus, (I think this is because I am running SE8) the manifest.mf is not in a folder called META-INF. In fact, I have no folder called META-INF. Is this significant?
Please, can anyone help me?

Installing JRE when running a jar on a machine without the JRE

Please I want to know how to add the JRE to my jar package so that in case the computer to run the application on has no JRE installed. The jar should prompt for an install which is included in the jar. And also not install when JRE is already running on the machine.

You can visit http://www.zerog.com/downloads_01.shtml. Unfortunatly they are trial versions of the software and licensed versions will cost money. When distributing applications it is easiest and cheapest to include a user guide, or at least a read-me, that states the user must have JRE to run your application and include where JRE can be acquired. The easiest method of packaging a Java application without using programs such as InstallAnywhere, is to include the application in a zip 'ready-to-run'. For similar programs take a look at Eclipse (www.eclipse.org).

Jdbc connection blocks when run from jar

The following code establishes a connection EXCEPT when run from within a jar file:
String jdbcDriverName = "oracle.jdbc.driver.OracleDriver";
String dbConnectionURL = "jdbc:oracle:thin:@192.168.2.7:1521:PRISM";
String userName = "mdo";
String password = "mdpass";
// Load the JDBC driver and create a connection to the database
Class.forName( jdbcDriverName );
OracleDataSource dataSource = new OracleDataSource();
dataSource.setURL( dbConnectionURL );
dataSource.setUser( userName );
dataSource.setPassword( password );
connection = dataSource.getConnection();
When run from a jar file, the application does not execute beyond the line:
connection = dataSource.getConnection();
No exceptions are thrown, it just appears that getConnection never returns.
Do I need to do anything different to execute this code from within a jar file?
Thanks in advance,
Phil
<><

When building the JAR file, I inadvertently included files from two Oracle JDBC driver versions (1.2 and 1.4). I was building a single jar file with all files in it.
I am guessing same named files existed in both driver JARs and caused "confussion" when combined into the single JAR.
Still, I would have expected an exception to be thrown or a null connection to be returned instead if the thread just blocking.
Thanks for all replies,
Phil
<><

How to solve error when run Depreciation (T-Code:AFAB)

Dear All Experts,
Hi,
I found error when run Depreciation for period 9 FYI. I had run Planed posting period Depreciation (TCode: AFAB). with fiscal year: 2010, posting period: 9, reason for posting run: Planed posting run. Select on Test Run. Then i found error message as below.
Documents manually posted within dep.doc.number range
     Message no. AA728
Diagnosis
     In the number range interval for the document type for posting
     depreciation, a document has been posted which was not created within
     the framework of depreciation posting. The last document posted by
     depreciation posting was assigned the number .
Procedure
     Contact your Systems Specialist. When changing the number range interval
     for the document type in depreciation posting, you have to specify a new
     interval in which no documents exist. Using organizational measures, you
     can guarantee that there are no documents apart from those created by
     depreciation posting in this number range.
Would you help me how to solve this error?
Thank you in advance
Best Regards
Utarat.P

Hi Utarat,
first question is: have you really manually posted a Documents within dep.doc.number range
If you post with RABUCH00, note 193984 could be relevant for you.
Check if the intervall in Table TABA don't fits with the Intervall in BKPF.
Example:
TABA
MANDT BUKRS AFBLGJ AFBLPE AFBANZ BLNRF      BLNRT      XBUKZ
100   XXXX   2010   004    01     4200000013 4200000016 X
100   XXXX   2010   005    01     4200000017 4200000020 X
100   XXXX   2010   006    01     4200000021 4200000024
On the other Hand In Table BKPF (or Tr. FB03) you can see that 4200000037 already
exits.
BUKRS BELNR      GJAHR BLART BUDAT      CPUDT      CPUTM    TCODE
XXXX   4200000024 2010 YY    30.06.2010 06.07.2010 19:36:30 ABF1
XXXX   4200000037 2010 YY    30.06.2010 06.07.2010 19:37:47 ABF1
Regards Bernhard

How to set the classpath for external .jar files after importing?

Hi techs,
How to set the classpath in WSAD5.1.2 after importing the .jar file to the WEB-INF/lib folder.
urgent

I got it.
after importing the jar file to the perspective,we need to right click on project name, go to proprties,
goto java build path,
there we need to include the external jar files.

Getting error when running the jar file..

Hi All,
I am new to executing jar file..Actually i have one class which contains the following code.
import com.documentum.fc.client.DfClient;
import com.documentum.fc.client.IDfClient;
import com.documentum.fc.client.IDfSession;
import com.documentum.fc.client.IDfSessionManager;
import com.documentum.fc.common.DfLoginInfo;
import com.documentum.fc.common.IDfLoginInfo;
import com.documentum.fc.common.DfException;
import com.fidelity.ftg.ereviewg2.migration.util.MigrationResource;
* This class is used for creating docbase connection
* *@type* DocbaseConnection
* *@author* a405304
* *@see*
public *class *DocbaseConnection {
//public static ResourceBundle resource;
IDfSessionManager sMgr = *null*;
IDfSession session = *null*;
String docbaseName;
*private* *static* DocbaseConnection +docbaseCon+;
* Constructor for DocbaseConnection
* *@throws* DfException
* *@throws* Exception
*private* DocbaseConnection()*throws* DfException, Exception{
//ResourceBundle bundle = ResourceBundle.getBundle(Constants.RESOURCE_PATH,Locale.getDefault());
MigrationResource bundle = MigrationResource.+getBundle+();
String userId = bundle.getString("DOCBASE_USERID");
String password = bundle.getString("DOCBASE_PASSWORD");
docbaseName = bundle.getString("DOCBASE_NAME");
IDfClient client = DfClient.+getLocalClient+();
sMgr = client.newSessionManager();
IDfLoginInfo loginInfo = *new* DfLoginInfo();
loginInfo.setUser( userId );
loginInfo.setPassword( password );
loginInfo.setDomain("");
sMgr.setIdentity( docbaseName, loginInfo );
session= sMgr.getSession( docbaseName );
System.+out+.println("# Connected to Docbase: "+session);
}Now i create the jar file whose name is docbaseconnection.jar
Now when i am running this jar file by using the following command then i am getting the following error..
C:\JAR_FILES>java -jar docbaseconnection.jar
Exception in thread "main" java.lang.NoClassDefFoundError: com/documentum/fc/client/DfQuery
For running this docbaseconnection.jar file i need the following thing in classpath...
C:\Program Files\Documentum\dctm.jar;C:\Program Files\Documentum\Shared\dfc.jar;C:\Program Files\Documentum\Shared\log4j.jar
I already add this jar files in the classpath of environment variables..Then also i am getting the same error..
Kindly help me...........

Well, let´s supose your manifest is defined as I did in my previous post. So, your directory base should be something like:
C:\dir
docbaseconnection.jar
dctm.jar
dfc.jar
anotherlibraries.jar
But, let´s supose you want something like
C:\dir
docbaseconnection.jar
lib (folder, which contains dctm.jar, dfc.jar, etc)
Then you should change the class-path of your manifest to
Class-Path: ./lib/dctm.jar ./lib/dfc.jar
That´s what I meant

Program doesn't show icon when run from JAR

Hello,
I have a working program with menu and toolbar buttons with icons. When I compile and run the JAR it runs fine with all icons showing up. The icons are located in a folder named icons. They are referenced inside the Java code by "icons/iconName.png". However, after I make a JAR file of the program, it runs normally, but the icons do not show up.
I use the command line command :
jar cvfm Program.jar manifest.txt *.class"
Then I open the JAR with WinRar and place the icons folder in the archive.
My manifest.txt looks like this:
{code}Manifest-Version: 1.0
Class-Path: .
Main-Class: MyMainClass
SplashScreen-Image: splash.png{code}
Any ideas what I did wrong?
Thanks.

I was having similar problems. If you use an IDE, such as NetBeans BE SURE to copy that image/ folder into the build/classes in the right place in the hierarchy. In any event, not having resource files such as textfiles and images over in the classes will prevent the IDE from executing a java run. That is obvious and easy to remedy.
And then the discovery: what works in .class files won't work in .jar. I found this link and tried the following code in a synchronized thread (you want the images loaded before going further with any inits such as frame.setLocation(), or panel.setSize(), etc.):
ClassLoader cldr = this.getClass().getClassLoader();
URL imageURL = cldr.getResource("images/usa_small.png");
icons[x] = new ImageIcons(imageURL);Where I found it:
[Class Loaders|http://bits.netbeans.org/dev/javadoc/org-openide-modules/org/openide/modules/doc-files/classpath.html]
That will help you on the implementation of proper technique. Not sure about adding files to .jar "after the fact".

I can not reveal how to set that when I open my Mozilla to appear on the home page, just bookmarks in pictures...

like this one:
http://www.google.hr/imgres?imgurl=http://sistemac.carnet.hr/system/files/opera.png&imgrefurl=http://sistemac.carnet.hr/node/147&usg=__Cw6wRHOdgK0llehsTsrdcz8jBLk=&h=689&w=815&sz=91&hl=hr&start=0&zoom=1&tbnid=5SfIkfvCCmDdFM:&tbnh=123&tbnw=145&prev=/images%3Fq%3Dopera%26um%3D1%26hl%3Dhr%26client%3Dfirefox-a%26sa%3DN%26rls%3Dorg.mozilla:en-US:official%26biw%3D1024%26bih%3D581%26tbs%3Disch:10%2C114&um=1&itbs=1&iact=hc&vpx=627&vpy=134&dur=1462&hovh=206&hovw=244&tx=140&ty=104&ei=718FTeKqI8vwsgaL6oHfCQ&oei=718FTeKqI8vwsgaL6oHfCQ&esq=1&page=1&ndsp=15&ved=1t:429,r:8,s:0&biw=1024&bih=581
thnx

See [[How to set the home page]]

How to set JPA when related entity do not want to CASCADE

Here is the case: weblogic 11g, EcliplseLink
in orm.xml, there is one snippet about the relationship(many to many) for two entities.
<many-to-many name="supportedHostTypes"
                    target-entity="com.gogog.server.lamp.model.impl.collection.HostTypeEntity"
                    fetch="EAGER">
                    <join-table name="HOST_COMPATIBILITY">
                         <join-column name="Model_ID" />
                         <inverse-join-column name="HOST_TYPE_ID" />
                    </join-table>
</many-to-many>
Because i do not set the cascade attributes, when i run Junit test, there is an error: During synchronization a new object was found through a relationship that was not marked cascade PERSIST:[email protected]b.
Actually, for target table HostType, i have the pre-loaded test data for this table. It does not need to insert it any more. If i set cascade.all attributes, of course, there will be integrity error happens.
This snippet can work in glassfish with toplink, and now i need to migrate to weblogic, and the error above happens.
Could any one has some idea how to config it for this case, thanks.

Hello,
This error will occur if the existence check for the HostTypeEntity is returning false. The existence check is explained at:
http://wiki.eclipse.org/Using_EclipseLink_JPA_Extensions_(ELUG)#How_to_Use_the_.40ExistenceChecking_Annotation
It states that by default, tje existence check is set to check the database implying that the HostTypeEntity with that identity doesn't exist in the database. Some questions if you are sure it does exist; what is the Entities id, what version of EclipseLink are you using and have you set any of the existence checking options anywhere?
Things to try would be explicitely setting the check_database option or reading in and using the managed instance as the reference instead.
Best Regards,
Chris

"no manifiest section for signature file entry" when run the Jar file

I built an application by using JBuilder 8.0 and it works fine. But when I deploy it into a jar file, whenever I run it, the following exception appears:
Exception in thread "main" java.lang.SecurityException: no manifiest section for signature file entry javax/security/cert/Certificate.class
at sun.securtiy.util.SignatureFileVerifier.verifySection
Because I didn't do anything about the security when build the application. I am really confused. Can somebody help?

I had a similiar problem using NetBeans. There must be a way to view the properties of your jar from Jbuilder and set its manifest. I am very new to this myself, but all I did was edit another manifest and copied into mine. Here is my example manifest:
Manifest-Version: 1.0
Main-Class: J3Ed
The first line is the default line for a manifest. It is very simple and there is much more that could be added, but is not always necessary. I recommend reading the documentation :
http://developer.java.sun.com/developer/Books/javaprogramming/JAR/basics/manifest.html
Also if you have an archiving utility such as powerarchiver or winzip, open your JAR and check to see that you have a MANIFEST.MF file. If you do then edit it where needed, if not create one and its relative location should be set to META-INF/MANIFEST.MF.
Hope this helps.

How to set path to run a Java program?

my pc os is win2000 service pack 3.
cpu is celoron 667mhz
256 pc133 sdram
i have done the setting b4 run a java program but no any effect.
setting as below:
set path=c:\j2sdk1.4.1_01\bin
set classpath=c:\j2sdk1.4.1_01\lib
my java file is store in C:\Java, file name is HelloWorld.java, so when i type:
C:\>
C:\>Java\javac HelloWorld.java
(the screen show me : java\javac not internal or external........")
and i try again as follow:
C:>
C:>\Java>javac HelloWorld.java
(the screen show : Exception in thread "main" java.lang.NoClassDefFoundError:HelloWorld/java)
i cant do anymore, who can help me?

you need to put the CLASSPATH to dir: c:\j2sdk1.4.1_01
and also to the directory you are working
For example, you are working in "C:\Myclasses". You need to put:
set CLASSPATH = C:\j2sk1.4.1_01;C:\Myclasses;
if you don't put your working directory, java doesn't find your classes
Try it and luck!

HOW TO SET VARIABLE WHEN METHOD HAS PRIVATE ACCESS ? ?

Dear People,
When I try to use an if then else statement the if part is not executed
only the else
if(highestBid != null)
System.out.println( Bid is: + highestBid.getValue());
else
System.out.println(" (no bid) )";
which can only mean that "highestBid is not being set
but since "Class Lot" has a private method
private void setHighestBid(Bid highestBid)
this.highestBid = highestBid;
the error message says:
"TryAuction.java": Error method setHighestBid()
has private access in class
so how do I get a value to "highestBid" so the "if" statement
will have a vaule for "highestBid ?
the showLots() method in the Class "Auction" doesn't print out the bids !
below are the classes
thank you in advance
Stan
package stan_bluej_ch4p90;
//Purpose of project: To demonstrate collections of objects
//Version: 2001.05.31
//How to start this project:
// Create an Auction object.
// Enter a few lots via its enterLot method. Only String
// descriptions of the lots are required.
// Create one or more Person objects to represent bidders.
// Show the lots and select one to bid for.
// Get the required Lot onto the object bench.
// Enter a bid for the lot, passing the Person who is
// bidding to the bidFor method.
public class TryAuction
public static void main(String[] args)
//create the auction
Auction cityAuction = new Auction();
//create the lots for sale
Lot bicycle = new Lot(1,"bicycle");
Lot lamp = new Lot(2, "lamp");
Lot trailer = new Lot(3, "trailer");
//enter the lots into the city Auction
cityAuction.enterLot("A bicycle in so so condition");
cityAuction.enterLot("A brand new lamp");
cityAuction.enterLot("A trailer built in 2001");
//show the lots
System.out.println();
System.out.println("The first lot for sale: " + bicycle.getDescription());
System.out.println("The second lot for sale: " + lamp.getDescription());
System.out.println("The third lot for sale: " + trailer.getDescription());
//create the people who will bid for the lots
Person Steve = new Person("Steve");
Person Maria = new Person("Maria");
//create the people's bids
Bid mariaLampBid = new Bid(Maria, 460);
lamp.setHighestBid(mariaLampBid);
Bid steveLampBid = new Bid(Steve, 510);
//create the people's bids
Bid mariaBicycleBid = new Bid(Maria, 1460);
//bicycle.setHighestBid(mariaBicycleBid);
Bid steveBicycleBid = new Bid(Steve, 1510);
//create the people's bids
Bid steveTrailerBid = new Bid(Steve, 700510);
//trailer.setHighestBid(steveTrailerBid);
Bid mariaTrailerBid = new Bid(Maria, 900460);
//give the bids
bicycle.bidFor(Maria,1460);
bicycle.bidFor(Steve, 1510);
System.out.println("The highest bid for the bicycle is " + bicycle.getHighestBid().getValue() );
lamp.bidFor(Maria,460);
lamp.bidFor(Steve,510);
System.out.println("The highest bid for the lamp is " + lamp.getHighestBid().getValue() );
trailer.bidFor(Steve, 700510);
trailer.bidFor(Maria,900460);
System.out.println("The highest bid for the trailer is " + trailer.getHighestBid().getValue() );
System.out.println(" \nMaria's bicycle bid is : " + mariaBicycleBid.getValue() );
System.out.println("Steve's bicycle bid is : " + steveBicycleBid.getValue() );
System.out.println(" \nMaria's lamp bid is : " + mariaLampBid.getValue() );
System.out.println("Steve's lamp bid is : " + steveLampBid.getValue() );
System.out.println("\nSteve's trailer bid is : " + steveTrailerBid.getValue() );
System.out.println(" Maria's trailer bid is : " + mariaTrailerBid.getValue() );
System.out.println();
cityAuction.showLots();
//cityAuction.close();
//The output I get is:
//The first lot for sale: bicycle
//The second lot for sale: lamp
//The third lot for sale: trailer
//The highest bid for this item is stan_bluej_ch4p90.Bid@f4a24a
//Maria's bicycle bid is : 1460
//Steve's lamp bid is : 1510
//Maria's lamp bid is : 460
//Steve's lamp bid is : 510
//Steve's trailer bid is : 700510
// Maria's trailer bid is : 900460
//1: A bicycle in so so condition
// (No bid)
//2: A brand new lamp
// (No bid)
//3: A trailer built in 2001
// (No bid)
package stan_bluej_ch4p90;
import java.util.*;
//Ex4.14
* A simple model of an auction.
* The auction maintains a list of lots of arbitrary length.
* @author David J. Barnes and Michael Kolling.
* @version 2001.06.08
public class Auction
// The list of Lots in this auction.
private ArrayList lots;
// The number that will be given to the next lot entered
// into this auction.
private int nextLotNumber;
* Create a new auction.
public Auction()
     lots = new ArrayList();
     nextLotNumber = 1;
* Enter a new lot into the auction.
* Lots can only by entered into the auction by an
* Auction object.
* @param description A description of the lot.
public void enterLot(String description)
     lots.add(new Lot(nextLotNumber, description));
     nextLotNumber++;
* Show the full list of lot numbers and lot descriptions in
* this auction. Include any details of the highest bids.
public void showLots()
     Iterator it = lots.iterator();
     while(it.hasNext()) {
     Lot lot = (Lot) it.next();
     System.out.println(lot.getNumber() + ": " +
               lot.getDescription());
     // Include any details of a highest bid.
     Bid highestBid = lot.getHighestBid();
     if(highestBid != null) {
          System.out.println(" Highest Bid: " +
                    highestBid.getValue());
     else {
          System.out.println(" (No bid)");
* Return the lot with the given number. Return null
* if a lot with this number does not exist.
* @param number The number of the lot to return.
public Lot getLot(int number)
     if((number >= 1) && (number < nextLotNumber)) {
     // The number seems to be reasonable.
     Lot selectedLot = (Lot) lots.get(number-1);
     // Include a confidence check to be sure we have the
     // right lot.
     if(selectedLot.getNumber() != number) {
          System.out.println("Internal error: " +
                    "Wrong lot returned. " +
                    "Number: " + number);
     return selectedLot;
     else {
     System.out.println("Lot number: " + number + " does not exist.");
     return null;
// public void close()
// Iterator i = lots.iterator();
// while(i.hasNext())
//     System.out.println("The winning amount for the " + bicycle.getDescription()
//     + " is " + bicycle.getHighestBid());
//     System.out.println("The winning amount for the " + lamp.getDescription()
//     + " is " + lamp.getHighestBid());
//     System.out.println("The winning amount for the " + trailer.getDescription()
//     + " is " + trailer.getHighestBid());
package stan_bluej_ch4p90;
* A class that models an auction bid. The bid contains a reference
* to the Lot bid for and the user making the bid.
* @author David J. Barnes and Michael Kolling.
* @version 2001.05.31
public class Bid
// The user making the bid.
private final Person bidder;
// The value of the bid. This could be a large number so
// the long type has been used.
private final long value;
* Create a bid.
* @param bidder Who is bidding for the lot.
* @param value The value of the bid.
public Bid(Person bidder, long value)
     this.bidder = bidder;
     this.value = value;
* @return The bidder.
public Person getBidder()
     return bidder;
* @return The value of the bid.
public long getValue()
     return value;
package stan_bluej_ch4p90;
* A class to model an item (or set of items) in an
* auction: a lot.
* @author David J. Barnes and Michael Kolling.
* @version 2001.06.08
public class Lot
// A unique identifying number.
private final int number;
// A description of the lot.
private String description;
// The current highest bid for this lot.
private Bid highestBid;
* Construct a Lot, setting its number and description.
* @param number The lot number.
* @param description A description of this lot.
public Lot(int number, String description)
     this.number = number;
     this.description = description;
* Attempt to bid for this lot. A successful bid
* must have a value higher than any existing bid.
* @param bidder Who is bidding.
* @param value The value of the bid.
public void bidFor(Person bidder, long value)
     // We trust that lot is genuine. There is nothing to
     // prevent a spurious lot from being bid for, but it
     // would not appear in the auction list.
     if((highestBid == null) ||
     (highestBid.getValue() < value)) {
     // This bid is the best so far.
     setHighestBid(new Bid(bidder, value));
     else {
     System.out.println("\nLot number: " + getNumber() +
               " (" + getDescription() + ")" +
               " has a bid of: " +
               highestBid.getValue());
* @return The lot's number.
public int getNumber()
     return number;
* @return The lot's description.
public String getDescription()
     return description;
* @return The highest bid for this lot. This could be null if
* there are no current bids.
public Bid getHighestBid()
     return highestBid;
* @param highestBid The new highest bid.
private void setHighestBid(Bid highestBid)
     this.highestBid = highestBid;
package stan_bluej_ch4p90;
* Maintain details of someone who participates in an auction.
* @author David J. Barnes and Michael Kolling.
* @version 2001.05.31
public class Person
// The name of this user.
private final String name;
* Create a new user with the given name.
* @param name The user's name.
public Person(String name)
     this.name = name;
* @return The user's name.
public String getName()
     return name;

Are you ready to kick yourself? The problem lies in the class Auction. You are using showLots() to print the lots, which you are trying to show the lot number, the description and the highest bid. But no there is no where in the class where you set the highest bid. In enterLot() you pass the description of the lot and it creates a new lot with the lot number and the description, but you don't give a bid. Then after the bids are done you do not update Auction to reflect the bids. Let the kicking commence. :-)

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