Reading & writing binaries(.class files)
folks,
how does one go about reading and writing .class files in java. I am able to write 'em only in ASCII format which is not what i want.
Thanks!
Did anybody say anything about disassembling?He wants to read and write class files, it's the title of the post.
I don't appreciate you dismissing my suggestions like that.
There's plenty of gotchas in reading and writing class files, such as Longs & Doubles taking up 2 positions in the constant pool.
Hence the reason why I suggested using an open source library like BCEL or ASM. These are still valid as class readers, even if you don't touch the byte code. ( disassembly )
But what would I know Ejp....sure I only wrote my own Java 1.5 class reader / disassembler.
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Hello all,
I have an xml file that I am using in lieu of a database to track conference rooms . This is a small file. I need to read this file from my java class file which is used by a jsp. Currently I have an absolute path C://logger/conference.xml. All works fine but I need to deploy to a different machine soon and so I need to place this file somewhere in the project directory structure (created by netbeans) so that it will be included in the war file and can be read by the java class file.
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TIA!!!public class DOMconference {
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*generic method that returns a Document object
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}Here is the complete error:
INFO: Server startup in 1282 ms
XML===============C:/Documents and Settings/gforte/agi/build/web/WEB-INF/conference.xml
[Fatal Error] bin:1:1: Content is not allowed in prolog.
org.xml.sax.SAXParseException: Content is not allowed in prolog.
at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:264)
at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:292)
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at agi.DOMconference.getDocument(DOMconference.java:91)
at agi.DOMconference.getLdapConferences(DOMconference.java:466)
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So if I change my code to this (note that all I change is how the constant XML_FILE_NAME is set and I copy and paste the path that is derived from getFilePath after the String.replaceAll call.):
public class DOMconference {
/** Creates a new instance of DOMconference */
public DOMconference() { }
private final static String XML_FILE_NAME = "C:/Documents and Settings/gforte/agi/build/web/WEB-INF/conference.xml";//set the output file and location
//public String XML_FILE_NAME = "";
private final static String FIRST_CONF_ID = "8200";//set the initial conference number
static Document document;
public void getFilePath(String path)
//XML_FILE_NAME = path;//.replaceAll("\\\\","/");
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File file = new File(XML_FILE_NAME);
*generic method that returns a Document object
public Document getDocument() throws SAXException, ParserConfigurationException,
IOException
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
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factory.setCoalescing(true);
factory.setNamespaceAware(false);
factory.setValidating(false);
DocumentBuilder builder = factory.newDocumentBuilder();
document = builder.parse(file);
return document;
}All is fine..
Just in case, here is my xml file contents copy and paste from notepad.
<?xml version="1.0"?><conf_rooms><conf_room><conf_id>8200</conf_id><conf_name>Conference room 1</conf_name></conf_room><conf_room><conf_id>8201</conf_id><conf_name>Conference Room 2</conf_name></conf_room><conf_room><conf_id>8202</conf_id><conf_name>dufus</conf_name></conf_room></conf_rooms>Thanks for hanging in there with me on this.
Graham -
Permissions to external Jar for reading-writing on a file
hi all,
I explain my situation.
I ' ve made an open source project similar to plpdf using jasper report libraries and others.
My project, which works perfectly in a java jre, have some problems in Oracle Aurora jvm.
I use the Reflection technique to load the classes from their libraries.
For this i use this class :
{color:#993300}<strong>import java.io.File;
import java.io.IOException;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLClassLoader;
* @author g.veltro
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Constructor cons = classe.getConstructor(parametersClasses);
return cons.newInstance(parameters);
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Method method = objClass.getDeclaredMethod(methodName,parametersClasses);
method.setAccessible(true);
return method.invoke(obj, parameters);
public static void addJarLibrary(String s) throws MalformedURLException, IOException{ <br /><br />addJarLibrary(new File(s)); <br /><br />}
public static void addJarLibrary(File f) throws MalformedURLException, IOException{ <br /><br />addJarLibrary(f.toURI().toURL()); <br /><br />}
public static void addJarLibrary(URL url) throws IOException{
URLClassLoader urlsysloader = null;
urlsysloader = (URLClassLoader) sysloader;
try { <br /><br />executeMethod(urlsysloader,URLClassLoader.class,"addURL",new Object[]url,new Class[]{URL.class});
} catch (Throwable t) { <br /><br />t.printStackTrace(); <br /><br />throw new IOException("Error, could not add "+url.getPath()+" to system classloader");<br /><br />}
public static void addJarLibraries(String libDir) throws IOException {
File directory = null;
directory = new File(libDir);
if(directory.isDirectory()){
JarFilter filter = new JarFilter();
File[] jarLibraries = directory.listFiles(filter);
for(int i=0;i<jarLibraries.length;i++){ <br /><br />addJarLibrary(jarLibraries</strong>{color}<em>{color:#993300}<strong>);
} else { <br /><br />throw new IOException(libDir+" is not a Directory !"); <br /><br />}
</strong>{color}
I gave all the permissions as dba to allow java to access files, etc. etc
{color:#993300}<strong>Begin
dbms_java.grant_permission( 'NEOGEO', 'SYS:java.lang.RuntimePermission', 'accessDeclaredMembers', '' );
dbms_java.grant_permission( 'NEOGEO', 'SYS:java.lang.reflect.ReflectPermission', 'suppressAccessChecks', '' );
end;
</strong>{color}
Then when I try to call a class library that attempts to access a file residing in the file-system i recive an exception.
This is an example of code that call a class and execute one methods.
{color:#993300}<strong>public static Object compileJrxml(String path_file_jrxml) throws ClassNotFoundException, InstantiationException, IllegalAccessException, IllegalArgumentException, InvocationTargetException, NoSuchMethodException {
Object jReport = null;
Object jCompileManager = null;
Class jcmClass = null;
Object [] params = {path_file_jrxml};
Class [] paramsClasses = {String.class};
jcmClass = Class.forName("net.sf.jasperreports.engine.JasperCompileManager",true,org.Reflection.Utility.sysloader);
jCompileManager = jcmClass.newInstance();
// compilazione del report
jReport = Utility.executeMethod(jCompileManager,jcmClass,"compileReport",params,paramsClasses);
return jReport;
</strong>{color}
this is the exception :
{color:#993300}<strong>java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java)
at java.lang.reflect.Method.invoke(Method.java)
at org.Reflection.Utility.executeMethod(Utility.java)
at org.EngineReport.ReportControl.compileJrxml(ReportControl.java:44)
at org.EngineReport.ReportOracle.getReportByte(ReportOracle.java:130)
at org.EngineReport.ReportOracle.ReportAsBlob(ReportOracle.java:69)
at org.EngineReport.ReportOracle.ReportAsBlob(ReportOracle.java:49)
Caused by: java.security.AccessControlException: the Permission (java.io.FilePermission /home/neogeo/Java_Resources.jrxml read) has not been granted to ProtectionDomain (file:/home/neogeo/lib/jasperreports-3.0.0.jar <no signer certificates>)
AppClassLoader: file:/home/neogeo/lib/xml-apis.jar file:/home/neogeo/lib/jpa.jar file:/home/neogeo/lib/jdt-compiler-3.1.1.jar file:/home/neogeo/lib/png-encoder-1.5.jar file:/home/neogeo/lib/ant-1.5.1.jar file:/home/neogeo/lib/jaxen-1.1.1.jar file:/home/neogeo/lib/mondrian-2.3.2.8944.jar file:/home/neogeo/lib/commons-javaflow-20060411.jar file:/home/neogeo/lib/batik-bridge.jar file:/home/neogeo/lib/antlr-2.7.5.jar file:/home/neogeo/lib/batik-parser.jar file:/home/neogeo/lib/hibernate3.jar file:/home/neogeo/lib/batik-ext.jar file:/home/neogeo/lib/commons-logging-1.0.2.jar file:/home/neogeo/lib/jasperreports-3.0.0.jar file:/home/neogeo/lib/batik-svggen.jar file:/home/neogeo/lib/batik-xml.jar file:/home/neogeo/lib/xml-apis-ext.jar file:/home/neogeo/lib/batik-dom.jar file:/home/neogeo/lib/jakarta-bcel-20050813.jar file:/home/neogeo/lib/servlet.jar file:/home/neogeo/lib/hsqldb-1.7.1.jar file:/home/neogeo/lib/batik-gvt.jar file:/home/neogeo/lib/batik-svg-dom.jar file:/home/neogeo/lib/jxl-2.6.jar file:/home/neogeo/lib/groovy-all-1.5.5.jar file:/home/neogeo/lib/xercesImpl.jar file:/home/neogeo/lib/batik-awt-util.jar file:/home/neogeo/lib/bsh-2.0b4.jar file:/home/neogeo/lib/commons-digester-1.7.jar file:/home/neogeo/lib/batik-css.jar file:/home/neogeo/lib/commons-logging-api-1.0.2.jar file:/home/neogeo/lib/jfreechart-1.0.0.jar file:/home/neogeo/lib/itext-1.3.1.jar file:/home/neogeo/lib/poi-3.0.1-FINAL-20070705.jar file:/home/neogeo/lib/batik-util.jar file:/home/neogeo/lib/commons-beanutils-1.7.jar file:/home/neogeo/lib/jcommon-1.0.0.jar file:/home/neogeo/lib/saaj-api-1.3.jar file:/home/neogeo/lib/batik-script.jar file:/home/neogeo/lib/xalan.jar file:/home/neogeo/lib/batik-anim.jar file:/home/neogeo/lib/commons-collections-2.1.jar
<no principals>
java.security.Permissions@1aebb385 (
(java.io.FilePermission /home/neogeo/lib/jasperreports-3.0.0.jar read)
(java.util.PropertyPermission user.language write)
(java.util.PropertyPermission * read)
(java.lang.RuntimePermission modifyThreadGroup)
(java.lang.RuntimePermission createSecurityManager)
(java.lang.RuntimePermission modifyThread)
(java.lang.RuntimePermission preferences)
(java.lang.RuntimePermission exitVM)
(oracle.aurora.security.JServerPermission LoadClassInPackage.*)
at java.security.AccessControlContext.checkPermission(AccessControlContext.java)
at java.security.AccessController.checkPermission(AccessController.java)
at java.lang.SecurityManager.checkPermission(SecurityManager.java)
at oracle.aurora.rdbms.SecurityManagerImpl.checkPermission(SecurityManagerImpl.java)
at java.lang.SecurityManager.checkRead(SecurityManager.java)
at java.io.FileInputStream.<init>(FileInputStream.java)
at net.sf.jasperreports.engine.xml.JRXmlLoader.load(JRXmlLoader.java:167)
at net.sf.jasperreports.engine.xml.JRXmlLoader.load(JRXmlLoader.java:152)
at net.sf.jasperreports.engine.JasperCompileManager.compileReport(JasperCompileManager.java:150)
... 9 more
</strong>{color}
The problem i think is that i have to give the permission for input and output on files to an external jar-library .
I don't know how i can resolve this problem ....
Do you have any suggestions? </em>Hi,
the problem with grant_permission is, that this can be done for a schema or a role - not for a ProtectionDomain as you need.
Some on this forum claim that it is possible to control the SecurityManager by the java.policy file in OH/javavm/lib/security. You should try to put something like this in this file (create it if it doesn’t exist)
grant codeBase "file:/<your codebase>" {
permission java.security.<your privilege>;
Unfortunately this doesn't worked for me in 11.1.0.6.0.
What you could try if you don't find other solution is to extend or write your own (not recommended) SecurityManager.
see http://download.oracle.com/docs/cd/B28359_01/java.111/b31225/chten.htm#BABJBJGE
To simple see if your application runs without security you can try the NullSecurityManager.
see http://java.sun.com/developer/onlineTraining/Security/Fundamentals/magercises/SecurityManager/help.html
compile and load the class in your schema and activate it with
System.setSecurityManager(new NullSecurityManager());
This is for sure not a solution for a productive system.
HTH
Jaromir D.B. Nemec -
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Hi all,
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output.txt
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ALC 1033989 ORM SVI 112 failure
Anyone have idea how to get the string from the dynamic log file.
we can achieve for static file by using :
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But how do read the data from a dynamic file and put into static file.
your suggestions are most welcome.
Message was edited by: Paulraj_mm
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kajbj wrote:
fredley_m wrote:
kajbj wrote:
fredley_m wrote:
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"Hello Brad,
Yes I know what I provided you with is what you already have achieved and this missing step is precisely what you need: how to setup the script to check the status and value of this XML document and then decide routing according to the state. But unfortunately this is what I found internally. The other resources are the ones you already know: support forums, scripting guides. The other resource with suggest to customer looking for script assistance is the Cisco Account Manager of your company, they know where to get the resources for such issues. Then again as I mentioned before on our phone conversation TAC does not support scripting but certainly if I find something else on my side I will let you know for sure."
I would do ponderous cartwheels of joy if someone who has this working in version 9.x [9.0.2 specifically] could share the deep magic. -
App for editing/reading/writing Excel, Word, Windows notepad text documents
I was wondering if any of you's could recommend some apps (from experience) that would allow me to, edit/read/write Excel, Word, Windows notepad text documents.
I could make do with an app that would do the above but without the ability to create, edit Windows notepad text documents. But been able to read, write, edit Word and Excel documents would have to be a must.
Thanks in advance.Thanks everyone for the help it was much appreciated.
After debating, I decided on Docs To Go at £9.99. For this amount its a universal app and as such I can have it installed on my iPhone as well as my iPad (which is what I have done), so £5 for to have it on each device is good value I feel. Quick Office on the other hand would have cost £8.99 for the iPad version and £5.99 for the iPhone version a total of almost £15, which is quite a bit more than I paid for Docs To Go.
Upto now, I find Docs To Go does everything I want from it, with regards to editing, reading, writing my Excel files. I tried transferring a Microsoft Windows Notepad text document over to the iPad/iPhone, I was able to read this and also add additional text/words to it and save it too. I do use text documents sometimes because if I want to add them onto a friend's computer for example, I know that they will be able to read them because with them having a Windows PC and also my friend does not have the Microsoft Office program on their PC.
The transferring of files from the computer to the iPhone/iPad is done via a free download of the Docs To Go desktop software program (which is both PC and Mac) compatible). You first need to go into the Docs To Go app and select 'ADD DESKTOP'. This then allows you to add a device to the Docs To Go desktop program thus enabling transfer. You are shown a pin number on the screen which you enter into the Docs To Go app, this procedure only needs to be done once.
The Docs To Go desktop program creates a folder during installation, where all the files etc are stored that are transferred/going to be transferred over are kept.
Some people might think needing to use a program to transfer files over is a bit of a nuisance, when other similar programs allow transfer via a web browser. Personally I find that those programs, the transfer is a bit cumbersome and can be a bit slow. I find the transfer via the Docs To Go desktop program is a lot easier and faster than using the web browser. The only downside I can see with needing to use the Docs To Go desktop program is that.. If I am at a friend's house and want to transfer something on to my iPhone/iPad. My friend would need to install the program, but saying that, its a very small program and its not a big deal having to install it. If they didn't want to install it, then there is either emailing the file or transferring the file to my Dropbox account. I forgot to mention that Docs To Go supports cloud/online storage such as Dropbox, GoogleDocs as well as others.
Once the above is done, you switch the wifi on, load the Docs To Go app, load the Docs To Go desktop program. You then just drag and drop the folders etc that you are wanting transferred over into the The Docs To Go desktop program, then you click on the circular arrow button and they are then transferred over onto the iPhone/iPad.
Once on the iPhone/iPad, you can view them, add additional information, when you make any changes you can press the circular arrow symbol (bottom left of the Docs To Go app) on the Docs To Go app and the changes are then synced back to the same file that is stored on the computer, so its very easy to keep everything in sync and up to date.
It is possible whilst using a Microsoft Word document to have a word count, you just touch the symbol at the bottom right of the Docs To Go app and choose Word Count from the drop down menu. I have heard a few people in some reviews saying that 'Docs To Go doesn't have a word count', when indeed it does.
One surprise is that Docs To Go, does not have a spell checker, but hopefully during later updates, the feature might be added. I sent my feedback to Docs To Go requesting this feature on future releases. I expect that there will be many other people who have requested this feature too.
I just thought I would share my experience with using Docs To Go.
Thanks again everyone for the help, it was much appreciated -
Tools for Comparing Java Class Files
Are there any tools out there that can compare two .class files to see if they are the same ?? Please help.
JanetIn Windows there's the FC command that compares two files to see if they are identical. In Unix there is no doubt a similar command. Or you could write a small bit of Java code that reads the two class files and compares them byte by byte.
-
Problem with ArrayLists and writing and reading from a .dat file (I think)
I'm brand new to this forum, but I'm sure hoping someone can help me with a problem I'm having with ArrayLists. This program was originally created with an array of objects that were displayed on a GUI with jtextFields, then cycling thru them via jButtons: First, Next, Previous, Last. Now I need to add the ability to modify, delete and add records. Both iterations of this program needed to write to and read from a .dat file.
It worked just like it was suppose to when I used just the array, but now I need to use a "dynamic array" that will grow or shrink as needed: i.e. an ArrayList.
When I aded the ArrayList I had the ArrayList use toArray() to fill my original array so I could continue to use all the methods I'd created for using with my array. Now I'm getting a nullPointerException every time I try to run my program, which means somewhere I'm NOT filling my array ???? But, I'm writing just fine to my .dat file, which is confusing me to no end!
It's a long program, and I apologize for the length, but here it is. There are also 2 class files, a parent and 1 child below Inventory6. This was written in NetBeans IDE 5.5.1.
Thank you in advance for any help anyone can give me!
LabyBC
package my.Inventory6;
import java.awt.Container;
import java.awt.Dimension;
import java.awt.GridBagConstraints;
import java.awt.GridBagLayout;
import java.awt.Insets;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.text.DecimalFormat;
import javax.swing.JOptionPane;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JTextField;
import java.io.*;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.lang.IllegalStateException;
import java.util.NoSuchElementException;
import java.util.ArrayList;
import java.text.NumberFormat;
// Class Inventory6
public class Inventory6 extends javax.swing.JFrame {
private static InventoryPlusColor[] inventory;
private static ArrayList inList;
// create a tool that insure the specified format for a double number, when displayed
private DecimalFormat doubleFormat = new DecimalFormat( "0.00" );
private DecimalFormat singleFormat = new DecimalFormat( "0");
// the index within the array of products of the current displayed product
private int currentProductIndex;
/** Creates new form Inventory6 */
public Inventory6() {
initComponents();
currentProductIndex = 0;
} // end Inventory6()
private static InventoryPlusColor[] getInventory() {
ArrayList<InventoryPlusColor> inList = new ArrayList<InventoryPlusColor>();
inList.add(new InventoryPlusColor(1, "Couch", 3, 1250.00, "Blue"));
inList.add(new InventoryPlusColor(2, "Recliner", 10, 525.00, "Green"));
inList.add(new InventoryPlusColor(3, "Chair", 6, 125.00, "Mahogany"));
inList.add(new InventoryPlusColor(4, "Pedestal Table", 2, 4598.00, "Oak"));
inList.add(new InventoryPlusColor(5, "Sleeper Sofa", 4, 850.00, "Yellow"));
inList.add(new InventoryPlusColor(6, "Rocking Chair", 2, 459.00, "Tweed"));
inList.add(new InventoryPlusColor(7, "Couch", 4, 990.00, "Red"));
inList.add(new InventoryPlusColor(8, "Chair", 12, 54.00, "Pine"));
inList.add(new InventoryPlusColor(9, "Ottoman", 3, 110.00, "Black"));
inList.add(new InventoryPlusColor(10, "Chest of Drawers", 5, 598.00, "White"));
for (int j = 0; j < inList.size(); j++)
System.out.println(inList);
InventoryPlusColor[] inventory = (InventoryPlusColor[]) inList.toArray
(new InventoryPlusColor[inList.size()]);
return inventory;
} // end getInventory() method
/** This method is called from within the constructor to
* initialize the form.
* WARNING: Do NOT modify this code. The content of this method is
* always regenerated by the Form Editor.
// <editor-fold defaultstate="collapsed" desc=" Generated Code ">
private void initComponents() {
jPanel1 = new javax.swing.JPanel();
IDNumberLbl = new javax.swing.JLabel();
IDNumberField = new javax.swing.JTextField();
prodNameLbl = new javax.swing.JLabel();
prodNameField = new javax.swing.JTextField();
colorLbl = new javax.swing.JLabel();
colorField = new javax.swing.JTextField();
unitsInStockLbl = new javax.swing.JLabel();
unitsInStockField = new javax.swing.JTextField();
unitPriceLbl = new javax.swing.JLabel();
unitPriceField = new javax.swing.JTextField();
invenValueLbl = new javax.swing.JLabel();
invenValueField = new javax.swing.JTextField();
restockingFeeLbl = new javax.swing.JLabel();
restockingFeeField = new javax.swing.JTextField();
jbtFirst = new javax.swing.JButton();
jbtNext = new javax.swing.JButton();
jbtPrevious = new javax.swing.JButton();
jbtLast = new javax.swing.JButton();
jbtAdd = new javax.swing.JButton();
jbtDelete = new javax.swing.JButton();
jbtModify = new javax.swing.JButton();
jbtSave = new javax.swing.JButton();
jPanel2 = new javax.swing.JPanel();
searchIDNumLbl = new javax.swing.JLabel();
searchIDNumbField = new javax.swing.JTextField();
jbtSearch = new javax.swing.JButton();
searchResults = new javax.swing.JLabel();
jbtExit = new javax.swing.JButton();
jbtExitwoSave = new javax.swing.JButton();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
jPanel1.setBorder(javax.swing.BorderFactory.createTitledBorder(javax.swing.BorderFactory.createEtchedBorder(), "Inventory Program"));
IDNumberLbl.setText("ID Number");
IDNumberField.setEditable(false);
prodNameLbl.setText("Product Name");
prodNameField.setEditable(false);
colorLbl.setText("Product Color");
colorField.setEditable(false);
colorField.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
colorFieldActionPerformed(evt);
unitsInStockLbl.setText("Units In Stock");
unitsInStockField.setEditable(false);
unitPriceLbl.setText("Unit Price $");
unitPriceField.setEditable(false);
invenValueLbl.setText("Inventory Value $");
invenValueField.setEditable(false);
restockingFeeLbl.setText("5% Restocking Fee $");
restockingFeeField.setEditable(false);
javax.swing.GroupLayout jPanel1Layout = new javax.swing.GroupLayout(jPanel1);
jPanel1.setLayout(jPanel1Layout);
jPanel1Layout.setHorizontalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(unitPriceLbl)
.addComponent(unitsInStockLbl)
.addComponent(colorLbl)
.addComponent(prodNameLbl)
.addComponent(IDNumberLbl)
.addComponent(restockingFeeLbl)
.addComponent(invenValueLbl))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(IDNumberField, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
.addComponent(prodNameField, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
.addComponent(colorField, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
.addComponent(unitsInStockField, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
.addComponent(unitPriceField, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
.addComponent(restockingFeeField, javax.swing.GroupLayout.Alignment.LEADING, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE)
.addComponent(invenValueField, javax.swing.GroupLayout.DEFAULT_SIZE, 176, Short.MAX_VALUE))
.addContainerGap())
jPanel1Layout.setVerticalGroup(
jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel1Layout.createSequentialGroup()
.addContainerGap()
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(IDNumberLbl)
.addComponent(IDNumberField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(prodNameLbl)
.addComponent(prodNameField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(colorField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(colorLbl))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(unitsInStockField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(unitsInStockLbl))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(unitPriceField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(unitPriceLbl))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(restockingFeeField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(restockingFeeLbl))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 10, Short.MAX_VALUE)
.addGroup(jPanel1Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(invenValueField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(invenValueLbl))
.addContainerGap())
jbtFirst.setText("First");
jbtFirst.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtFirstActionPerformed(evt);
jbtNext.setText("Next");
jbtNext.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtNextActionPerformed(evt);
jbtPrevious.setText("Previous");
jbtPrevious.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtPreviousActionPerformed(evt);
jbtLast.setText("Last");
jbtLast.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtLastActionPerformed(evt);
jbtAdd.setText("Add");
jbtAdd.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtAddActionPerformed(evt);
jbtDelete.setText("Delete");
jbtModify.setText("Modify");
jbtModify.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtModifyActionPerformed(evt);
jbtSave.setText("Save");
jbtSave.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtSaveActionPerformed(evt);
jPanel2.setBorder(javax.swing.BorderFactory.createTitledBorder(javax.swing.BorderFactory.createEtchedBorder(), "Search by:"));
searchIDNumLbl.setText("Item Number:");
jbtSearch.setText("Search");
searchResults.setFont(new java.awt.Font("Tahoma", 1, 12));
javax.swing.GroupLayout jPanel2Layout = new javax.swing.GroupLayout(jPanel2);
jPanel2.setLayout(jPanel2Layout);
jPanel2Layout.setHorizontalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addContainerGap()
.addComponent(searchIDNumLbl)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGap(259, 259, 259)
.addComponent(searchResults, javax.swing.GroupLayout.PREFERRED_SIZE, 213, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jbtSearch, javax.swing.GroupLayout.PREFERRED_SIZE, 83, javax.swing.GroupLayout.PREFERRED_SIZE)
.addComponent(searchIDNumbField, javax.swing.GroupLayout.PREFERRED_SIZE, 143, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
jPanel2Layout.setVerticalGroup(
jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(searchIDNumLbl)
.addComponent(searchIDNumbField, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel2Layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(jPanel2Layout.createSequentialGroup()
.addGap(32, 32, 32)
.addComponent(searchResults, javax.swing.GroupLayout.PREFERRED_SIZE, 17, javax.swing.GroupLayout.PREFERRED_SIZE))
.addGroup(jPanel2Layout.createSequentialGroup()
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtSearch)))
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
jbtExit.setText("Save and Exit");
jbtExit.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtExitActionPerformed(evt);
jbtExitwoSave.setText("Exit");
jbtExitwoSave.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
jbtExitwoSaveActionPerformed(evt);
javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, 248, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED, 44, Short.MAX_VALUE)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING, false)
.addComponent(jbtExitwoSave, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jbtExit)))
.addGroup(layout.createSequentialGroup()
.addComponent(jbtFirst)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtNext)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtPrevious)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtLast))
.addGroup(layout.createSequentialGroup()
.addComponent(jPanel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addGap(12, 12, 12)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jbtAdd)
.addComponent(jbtDelete)
.addComponent(jbtModify)
.addComponent(jbtSave))))
.addContainerGap())
layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {jbtFirst, jbtLast, jbtNext, jbtPrevious});
layout.linkSize(javax.swing.SwingConstants.HORIZONTAL, new java.awt.Component[] {jbtAdd, jbtDelete, jbtModify, jbtSave});
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addGap(21, 21, 21)
.addComponent(jbtAdd)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtDelete)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtModify)
.addGap(39, 39, 39)
.addComponent(jbtSave))
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jPanel1, javax.swing.GroupLayout.PREFERRED_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.PREFERRED_SIZE)))
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.BASELINE)
.addComponent(jbtFirst)
.addComponent(jbtNext)
.addComponent(jbtPrevious)
.addComponent(jbtLast))
.addGap(15, 15, 15)
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(jPanel2, javax.swing.GroupLayout.PREFERRED_SIZE, 80, javax.swing.GroupLayout.PREFERRED_SIZE)
.addGroup(layout.createSequentialGroup()
.addComponent(jbtExit)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.RELATED)
.addComponent(jbtExitwoSave)))
.addContainerGap())
pack();
}// </editor-fold>
private void jbtExitwoSaveActionPerformed(java.awt.event.ActionEvent evt) {
System.exit(0);
private void jbtSaveActionPerformed(java.awt.event.ActionEvent evt) {
String prodNameMod, colorMod;
double unitsInStockMod, unitPriceMod;
int idNumMod;
idNumMod = Integer.parseInt(IDNumberField.getText());
prodNameMod = prodNameField.getText();
unitsInStockMod = Double.parseDouble(unitsInStockField.getText());
unitPriceMod = Double.parseDouble(unitPriceField.getText());
colorMod = colorField.getText();
if(currentProductIndex == inventory.length) {
inList.add(new InventoryPlusColor(idNumMod, prodNameMod,
unitsInStockMod, unitPriceMod, colorMod));
InventoryPlusColor[] inventory = (InventoryPlusColor[]) inList.toArray
(new InventoryPlusColor[inList.size()]);
} else {
inventory[currentProductIndex].setIDNumber(idNumMod);
inventory[currentProductIndex].setProdName(prodNameMod);
inventory[currentProductIndex].setUnitsInStock(unitsInStockMod);
inventory[currentProductIndex].setUnitPrice(unitPriceMod);
inventory[currentProductIndex].setColor(colorMod);
displayProduct(inventory[currentProductIndex]);
private static void writeInventory(InventoryPlusColor i,
DataOutputStream out) {
try {
out.writeInt(i.getIDNumber());
out.writeUTF(i.getProdName());
out.writeDouble(i.getUnitsInStock());
out.writeDouble(i.getUnitPrice());
out.writeUTF(i.getColor());
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "I/O Exception writing data",
"", JOptionPane.ERROR_MESSAGE);
System.exit(0);
} //end writeInventory()
private static DataOutputStream openOutputStream(String name) {
DataOutputStream out = null;
try {
File file = new File(name);
out =
new DataOutputStream(
new BufferedOutputStream(
new FileOutputStream(file)));
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "I/O Error", "", JOptionPane.ERROR_MESSAGE);
System.exit(0);
return out;
} // end openOutputStream()
private static void closeFile(DataOutputStream out) {
try {
out.close();
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "I/O Exception closing file",
"", JOptionPane.ERROR_MESSAGE);
System.exit(0);
} // end closeFile()
private static DataInputStream getStream(String name) {
DataInputStream in = null;
try {
File file = new File(name);
in = new DataInputStream(
new BufferedInputStream(
new FileInputStream(file)));
} catch (FileNotFoundException e) {
JOptionPane.showMessageDialog(null, "The file doesn't exist",
"", JOptionPane.ERROR_MESSAGE);
System.exit(0);
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "I/O Error creating file",
"", JOptionPane.ERROR_MESSAGE);
System.exit(0);
return in;
private static void closeInputFile(DataInputStream in) {
try {
in.close();
} catch (IOException e) {
JOptionPane.showMessageDialog(null, "I/O Exception closing file",
"", JOptionPane.ERROR_MESSAGE);
System.exit(0);
} // end closeInputFile()
private double entireInventory() {
// a temporary double variable that the method will return ...
// after each product's inventory is added to it
double entireInventory = 0;
// loop to control number of products
for (int index = 0; index < inventory.length; index++) {
// add each inventory to the entire inventory
entireInventory += inventory[index].setInventoryValue();
} // end loop to control number of products
return entireInventory;
} // end method entireInventory
private void jbtLastActionPerformed(java.awt.event.ActionEvent evt) {
currentProductIndex = inventory.length-1; // move to the last product
// display the information for the last product
displayProduct(inventory[currentProductIndex]);
private void jbtPreviousActionPerformed(java.awt.event.ActionEvent evt) {
if (currentProductIndex != 0) // it's not the first product displayed
currentProductIndex -- ; // move to the previous product (decrement the current index)
} else // the first product is displayed
currentProductIndex = inventory.length-1; // move to the last product
// after the current product index is set, display the information for that product
displayProduct(inventory[currentProductIndex]);
private void jbtNextActionPerformed(java.awt.event.ActionEvent evt) {
if (currentProductIndex != inventory.length-1) // it's not the last product displayed
currentProductIndex ++ ; // move to the next product (increment the current index)
} else // the last product is displayed
currentProductIndex = 0; // move to the first product
// after the current product index is set, display the information for that product
displayProduct(inventory[currentProductIndex]);
private void jbtFirstActionPerformed(java.awt.event.ActionEvent evt) {
currentProductIndex = 0;
// display the information for the first product
displayProduct(inventory[currentProductIndex]);
private void colorFieldActionPerformed(java.awt.event.ActionEvent evt) {
// TODO add your handling code here:
private void jbtModifyActionPerformed(java.awt.event.ActionEvent evt) {
prodNameField.setEditable(true);
prodNameField.setFocusable(true);
unitsInStockField.setEditable(true);
unitPriceField.setEditable(true);
private void jbtAddActionPerformed(java.awt.event.ActionEvent evt) {
IDNumberField.setText("");
IDNumberField.setEditable(true);
prodNameField.setText("");
prodNameField.setEditable(true);
colorField.setText("");
colorField.setEditable(true);
unitsInStockField.setText("");
unitsInStockField.setEditable(true);
unitPriceField.setText("");
unitPriceField.setEditable(true);
restockingFeeField.setText("");
invenValueField.setText("");
currentProductIndex = inventory.length;
private void jbtExitActionPerformed(java.awt.event.ActionEvent evt) {
DataOutputStream out = openOutputStream("inventory.dat");
for (InventoryPlusColor i : inventory)
writeInventory(i, out);
closeFile(out);
System.exit(0);
private static InventoryPlusColor readProduct(DataInputStream in) {
int idNum = 0;
String prodName = "";
double inStock = 0.0;
double pricBalusC -- The line that gives me my NullPointerException is when I call the "DisplayProduct()" method. Its a dumb question, but with NetBeans how do I find out which reference could be null? I'm not very familiar with how NetBeans works with finding out how to debug. Any help you can give me would be greatly appreciated.The IDE is com-plete-ly irrelevant. It's all about the source code.
Do you understand anyway when and why a NullPointerException is been thrown? It is a subclass of RuntimeException and those kind of exceptions are very trival and generally indicate an design/logic/thinking fault in your code.
SomeObject someObject = null; // The someObject reference is null.
someObject.doSomething(); // Invoking a reference which is null would throw NPE.
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