java-programmer >>'back engineering' java applets

'back engineering' java applets

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- 1
  - butting components right up against each otherOn Fri, 27 Jun 2003 13:29:59 GMT, Roedy Green <email***@***.com> wrote:
    
    > On Fri, 27 Jun 2003 14:06:22 +0100, Daniel Dyer
    > <email***@***.com> wrote or quoted :
    >
    >> Sorry, I didn't mean ipadx/ipady, that won't help. You certainly
    >> shouldn't need to use absolute positioning though. Do you have any
    >> sample code to show us?
    > I just wanted to put a string of JTextFields with black backgrounds
    > right against each other so they look like one continuous field.
    
    Have you tried setting the borders on the text fields to null? Maybe it's
    the borders that make it look like there's a gap. Have you tried a
    different layout (maybe try GridLayout, just to see if it looks the same,
    it's much simpler so it will be easier to spot if you've done something
    wrong).
    
    Dan.
    
    --
    Daniel Dyer
    Empathy Software (http://www.empathysoftware.com)
    
    -----= Posted via Newsfeeds.Com, Uncensored Usenet News =-----
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- 6
  - File upload with JSF.....Hi,
    i'm a new user of java. I have a question. I have to develop a JSF
    application that make user able to:
    
    1) Upload a txt file
    2) Showing to user columns and rows numbers of file.
    
    For this second operation i'have developed a java application that
    receive a txt file from a BufferedReader and counts rows and columns
    number.
    My questions are:
    
    1) How can i realize file upload with JSF?
    2) In which format a file is uploaded?
    3) Can i use my java application for counting rows and columns number
    of file?
    
    Can you help me?Please use easy concepts because i'm inexpert.....
- 6
  - Balanced TreeI was wondering if there were a built in (or freely available) library for
    handling balanced trees.
    
    I find many projects use them or could benefit from them.
    
    :)
- 12
  - PropertyChangeListener not recognizing changes to a putClientPropertyI must be missing out on something fundamental . . . why doesn't the
    following code ever register a PropertyChangeEvent?
    
    import java.beans.*;
    import javax.swing.*;
    import java.awt.*;
    import java.awt.event.*;
    import javax.swing.text.*;
    
    public class PropTest extends JFrame {
    private Boolean myBoolean = Boolean.FALSE;
    
    public PropTest() {
    super("PropertyChangeListener Test");
    JPanel panel = new JPanel();
    JButton button = new JButton(new BooleanAction("Button pushed"));
    button.setText("Push me!");
    panel.putClientProperty("myBoolean", myBoolean);
    panel.addPropertyChangeListener("myBoolean", new BooleanListener());
    panel.add(button);
    panel.getInputMap().put(KeyStroke.getKeyStroke(KeyEvent.VK_SPACE, 0),
    "space");
    panel.getActionMap().put("space", new BooleanAction("Space
    pressed"));
    this.getContentPane().add(panel);
    }
    
    private class BooleanAction extends AbstractAction {
    String title;
    public BooleanAction(String title) {
    super();
    this.title = title;
    }
    
    public void actionPerformed(ActionEvent e) {
    System.out.println(title);
    System.out.println("Old value: " + myBoolean.toString());
    myBoolean = new Boolean(!myBoolean.booleanValue());
    System.out.println("New value: " + myBoolean.toString());
    }
    }
    
    private class BooleanListener implements PropertyChangeListener {
    public void propertyChange(PropertyChangeEvent e) {
    System.out.println("Hey, you changed my value!");
    }
    }
    
    public static void main(String[] args) {
    PropTest propTest = new PropTest();
    propTest.setResizable(false);
    propTest.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    propTest.pack();
    propTest.setVisible(true);
    }
    }
- 12
  - checkbox ploblem pls help!!i was new in java and i now completed add the checkbox in each node but the
    ploblem is i cant click the check box..
    what should i do in next step... pls help me thank you..
    following is my code
    
    fileTree.setCellRenderer(new DefaultTreeCellRenderer()
    {
    public Component getTreeCellRendererComponent(JTree tree, Object
    value,
    boolean sel, boolean expanded, boolean leaf, int row, boolean hasFocus)
    {
    super.getTreeCellRendererComponent(tree, value, sel, expanded, leaf,
    row, hasFocus);
    JCheckBox chk = new JCheckBox();
    chk.setContentAreaFilled(false);
    chk.setEnabled(true);
    //
    chk.setBorderPaintedFlat(true);
    chk.setOpaque(false);
    
    JPanel jPanel = new JPanel(new BorderLayout());
    jPanel.add(chk, BorderLayout.WEST);
    jPanel.add(this, BorderLayout.EAST);
    return jPanel;
    }
    
    --
    Message posted via http://www.javakb.com
- 12
  - DB Selection - J2MEHi,
    
    I am developing an application for PDAs using IBMs
    VM (J9). Now my problem is, that I want to store
    data on the device. Well, I am using J2ME with
    Personal Profile to do this, so file support is
    present in this configuration. Now I wonder if
    there exist solutions to store data and easily
    retrieve it. (commercial, free, open source)
    
    I have to store data on the device, add new
    data often, update and delete old data sometimes.
    
    1. So how do you store data, when not having present
    a complete RDBMS?
    2. There are RDBMS for this platform too.
    Any experiences using them?
    (for example Pointbase)
    3 There is this JDO Option (for example
    with ObjectDB) is this working well?
    4. What do you think of the following options,
    which I already found, but have no idea
    whether they will work?
    
    I alread checked:
    -JDMB (rather minimalistic, only key/value pairs to be saved)
    -JISP (produces rather big files -> not suitable for
    constrained devices?)
    -HSQL (Anybody got that to work within the mentioned configuration?
    I think mainly the java.sql.* classes are missing in the
    personal profile)
    -ObjectDB (OODB with JDO, no idea exactly if this will
    work for my purposes)
    
    Any help will be appreciated
    Rene
- 12
  - sample jsp servlet application requiredHi geeks,
    I'm a beginner in jsp and servlets, i want a sample JSP-SERVLET
    applicaton with source code. Can you please tell me where can i get the
    sample applications.
    Thanks in advance...
- 12
  - JAVA ?Oracle Programmers wantedHighly experienced JAVA / Oracle programmers wanted for a three month
    contract in South Africa (JHB). Must have had ERP experience with some
    integration skills.Open source experience an added advantage. Must be able
    to work in a team.
    
    Email CV to email***@***.com
- 13
  - Java client-server: what options are there?This is an issue that I have been pondering and investigating
    for years, and I wish there was a book, chapter or URL that
    covered it.
    
    I have to develop client-server systems in which the following
    is pretty much decided:
    
    - The database is Oracle 9iR2
    - The server OSs are Solaris and Linux
    - The clients (a few dozen) are Windows (XP?)
    - The client side runs on Java
    
    Those are the givens, the rest is up for grabs...
    
    The main undecided part is: exactly how to realize the client-server
    connection? That's what I would like to hear and read about.
    What options do I have?
    
    To get the ball rolling, I will share my experiences so far.
    
    First, I tried the JDBC approach, with a standalone application.
    There was a stored procedure in the server, and it was called
    from the client. The cons were: the size of the JDBC being much
    larger than my app, and there was also the issue of performance.
    I feel that I should move more of the functionality and heavy duty
    processing to the server side, where I can have plenty of horsepower.
    
    My second attempt was a Java applet which got its data
    through CGI-BIN from an OCI C program running on the server.
    The performance was pretty good and I'd like to stick with
    the OCI part but not with CGI-BIN.
    
    I just began the third approach: using SSH. The server part
    is a given since it comes ready in Linux, and I got the Java
    client part from sshtools.com.
    
    I have read about servlets, Tomcat, etc. but it looks like once
    I get into that stuff (the area seems to be called "Enterprise"),
    the tools become extremely expensive (for instance I will have
    to upgrade my $700 Developer JBuilder to a $3500 Enterprise JBuilder).
    
    The issue of performance still worries me (I am a speed freak):
    I wish I could just use the Unix R-commands (rsh, etc.) so all
    the encrypting-decrypting doesn't get in the way of client
    performance (my app is Intranet in a trusted environment) but
    I guess I can live with the more modern, secure, etc., SSH.
    
    Thanks very much for sharing your expert insight on this,
    (and if you are a writer deciding on a topic, I'll bet that
    this one will sell a lot of books! - anyone from O'Reilly
    out there?)
    
    -Ramon F Herrera
- 15
  - HalfTruth=Lie (was: I'm still waiting for somebody to offer co...)> From: "Phlip" <email***@***.com>
    > The good is the enemy of the best.
    
    A half-truth is a lie.
    A bicycle with only one wheel isn't useful.
    Yin without yang isn't useful.
    A glass half full but not half empty, or vice versa, is not the whole
    picture.
    For nearly every cliche there's an opposite which is equally valid in
    different circumances.
    
    Please choose which of the following activities you would most and
    least like to participate in:
    (1) Have bamboo shoots driven up under your fingernails.
    (2) Undergo Chinese water torture.
    (3) Be trapped in a large tank with one (1) pihrana.
- 16
  - JTable row selection (left and right mouse)Is it possible to be able to allow users to use either the left or the right
    mouse button to select one or more
    rows in a JTable, and upon the selection, be able to tell which mouse button
    they used to select the row(s)?
    
    I have 15 tables on the screen. The user needs to select one or more rows
    from one table (the source)
    and then the same number of rows in another table (the destination) and then
    I need to swap the row
    data from both tables. So, I need a way to differentiate between the
    selections on the source and the
    destination tables.
    
    Thank you.
- 16
  - class not found within IEHi,
    
    I've written an applet. It properly works with Mozila. But with
    Internet Explorer it says "Class [the applet's name] not found" or
    something.
    What is the problem? How can I fix it?
    
    Thank you,
    Siamak
- 16
  - How to control the cursor positon of java program in console mode?I am writing a small database that requires user input.
    
    However, whenever something is output to the screen, the cursor stays at the
    beginning of the output instead of the end of the output.
    
    How can I let it go to the end of the output?
    
    For example:
    
    say, the output is like this:
    
    This is a database. Please input your information below.
    prompt:>
    
    I want the cursor to go to after the ">" sign but it stays in front of
    "this" although whenever the user presses the keyboard it goes the end after
    ">".
    
    This is not a big problem but makes my application look not so professional.
    
    Anyway to cure this?
    
    John
- 16
  - newbie: Global EJB and more ...
    Hi group,
    
    While thinking of how to transfer a tranditional client-server app
    into J2EE, I got following two questions:
    
    1, In a typical application, there should be some global (even
    singleton) objects which are created on application startup code and
    stay there until the program exiting. In the idiom of J2EE, what kind
    of Beans act like this kind of global object? And, when and how these
    global beans should be created?
    
    2, I knew Beans have to be deployed onto the server before they come
    to be available, but those Beans quit often need some objects to
    complete its job, these objects may encapsulate a algorithem, may do
    some management task, but they typically dont have to exposed to
    client tire or web tire. I call these objects are intermediate
    objects. My question is, should this kind of objects need to be a EJB?
    My J2EE books seems only to mention three kinds of Beans,
    SessionBeans, EntityBeans and MessageBeans. But what do I do for those
    intermediate objects?
    
    Thanks in advance.
    
    --
    email***@***.com
    
    %% (fortunes)
    Q: How did you get into artificial intelligence?
    A: Seemed logical -- I didn't have any real intelligence.
- 16
  - JTable and associating objects with nodesHi,
    
    Does anyone know how to store objects in a name value pair data structure
    (i.e. hashmap) in a JTable? It easy to store the name of the object but to
    store the object with the name, I am not sure.
    
    Any help would be great
    
    Thanks
    
    Bob

Author

Message

Jeremy Watts

Posted: 2005-6-13 16:42:00

Top

java-programmer, 'back engineering' java applets hi,

is it possible to gain access to java code by a user using an applet over
the web? i know with some scripting languages like PHP or javascript then
users can view the code and 'back engineer' it to discover how it works etc.

is this possible with java?

thanks

Thomas Weidenfeller

Posted: 2005-6-13 17:33:00

Top

java-programmer >> 'back engineering' java applets Jeremy Watts wrote:
> is it possible to gain access to java code by a user using an applet over
> the web?

Yes. The user loads the bytecode over the network and can decompile it.
You can make reverse engineering more difficult, but not impossible, by
using an obfuscater (google for detail). Decryption classloaders also
don't make reverse engineering impossible (the classloader itself can be
reverse engineered and then used to decrypt the "secret" code which it
should actually protect).

If you don't want your code out there on the net don't put it there.
Provide a web application and keep all your code on the server, e.g. in
some servlet and just send HTML pages to the user.

/Thomas

PS: Most code isn't worth reverse engineering. Are you sure that your
applet is so special that it needs the protection?

--
The comp.lang.java.gui FAQ:
ftp://ftp.cs.uu.nl/pub/NEWS.ANSWERS/computer-lang/java/gui/faq

Index ‹ java-programmer

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- 4
  - "Invalid column name" inserting a row with weblogic/oracle
    
    bsaastad wrote:
    
    > Hello,
    >
    >
    >
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    >
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    >
    >
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    > with the exception of database inserts. They ALWAYS fail and return an
    > "ORA-00904: invalid column name". I am connecting to the database via a
    > pooled data source. This code worked fine under WLS6.1 using the
    > Weblogic JDriver. The JDriver performs the inserts under 8.1 but the
    > Statement.executeBatch() command returns a 0-length int[] (an
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    > by Oracle. I have tried both the type 4 driver and the type 2 oci
    > driver with exactly the same result.
    
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    >
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    >
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    > POOL_R WHERE POOL_ID = 11'
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    > i_internal_StatementImpl_weblogic_jdbc_wrapper_Statement_ora-
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    > _StatementStub_weblogic_jdbc_rmi_internal_StatementImpl_weblogi-
    > c_jdbc_wrapper_Statement_oracle_jdbc_driver_OracleStatement_811-
    > _WLStub.executeUpdate(Unknown Source)
    >
    >
    >
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    >
    >
    >
    > at com.billing.tm.persist.BatchTest.main(BatchTest.java:185)
    >
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    >
    >
    >
    >
    >
    > at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError-
    > .java:134)
    >
    >
    >
    > at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java:289)
    >
    >
    >
    > at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:579)
    >
    >
    >
    > at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1894)
    >
    >
    >
    > at oracle.jdbc.ttc7.TTC7Protocol.parseExecuteFetch(TTC7Protocol-
    > .java:1094)
    >
    >
    >
    > at oracle.jdbc.driver.OracleStatement.executeNonQuery(OracleSta-
    > tement.java:2132)
    >
    >
    >
    > at oracle.jdbc.driver.OracleStatement.doExecuteOther(OracleStat-
    > ement.java:2015)
    >
    >
    >
    > at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(Orac-
    > leStatement.java:2877)
    >
    >
    >
    > at oracle.jdbc.driver.OracleStatement.executeUpdate(OracleState-
    > ment.java:858)
    >
    >
    >
    > at weblogic.jdbc.wrapper.Statement.executeUpdate(Statement-
    > .java:328)
    >
    >
    >
    > at weblogic.jdbc.rmi.internal.StatementImpl_weblogic_jdbc_wrapp-
    > er_Statement_oracle_jdbc_driver_OracleStatement.executeUpdate(U-
    > nknown Source)
    >
    >
    >
    > at weblogic.jdbc.rmi.internal.StatementImpl_weblogic_jdbc_wrapp-
    > er_Statement_oracle_jdbc_driver_OracleStatement_WLSkel.invoke(U-
    > nknown Source)
    >
    >
    >
    > at weblogic.rmi.internal.BasicServerRef.invoke(BasicServerRef-
    > .java:466)
    >
    >
    >
    > at weblogic.rmi.internal.BasicServerRef$1.run(BasicServerRef-
    > .java:409)
    >
    >
    >
    > at weblogic.security.acl.internal.AuthenticatedSubject.doAs(Aut-
    > henticatedSubject.java:353)
    >
    >
    >
    > at weblogic.security.service.SecurityManager.runAs(SecurityMana-
    > ger.java:144)
    >
    >
    >
    > at weblogic.rmi.internal.BasicServerRef.handleRequest(BasicServ-
    > erRef.java:404)
    >
    >
    >
    > at weblogic.rmi.internal.BasicExecuteRequest.execute(BasicExecu-
    > teRequest.java:30)
    >
    >
    >
    > at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java)
    >
    >
    >
    > at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:170)
    >
    >
    > --
    > Posted via http://dbforums.com
- 5
  - Problem with Session Beans stateHi, I'm currently making a session bean, which will eventually act as
    a Shopping Basket.
    
    I have implemented the bean so that it just accepts a string (which
    will eventually be an object reference), and the user can add and
    remove strings.
    
    Unfortunately, if I access the same bean from another machine and
    create an instance of the session bean, they are shown the same
    contents as from the other machine.
    
    The session bean type is set to stateful (and I have tried stateless).
    Can anyone point me in the direction of the problem please?
    
    Cheers,
    David
- 6
  - XML Validation problemI am having alot of trouble getting a XML document validated with a
    schema.
    
    I got a sample document and schema off of w3schools.com, which passed
    an online xml validator:
    http://tools.decisionsoft.com/schemaValidate.html. I cannot, however,
    get them validated programmatically.
    
    The documents are:
    
    node.xsd:
    
    <?xml version="1.0"?>
    <xs:schema xmlns:xs="http://www.w3.org/2001/XMLSchema"
    targetNamespace="http://www.w3schools.com"
    xmlns="http://www.w3schools.com"
    elementFormDefault="qualified"><xs:element name="note">
    <xs:complexType>
    <xs:sequence>
    <xs:element name="to" type="xs:string"/>
    <xs:element name="from" type="xs:string"/>
    <xs:element name="heading" type="xs:string"/>
    <xs:element name="body" type="xs:string"/>
    </xs:sequence>
    </xs:complexType>
    </xs:element></xs:schema>
    
    node.xml:
    
    <?xml version="1.0"?>
    <note
    xmlns="http://www.w3schools.com"
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://www.w3schools.com note.xsd">
    
    <to>Tove</to>
    <from>Jani</from>
    <heading>Reminder</heading>
    <body>Don't forget me this weekend!</body>
    </note>
    
    I'm using java 1.5 currently, although I had problems with 1.4 and
    xerces, so I'm pretty confident the problem isn't related to the java
    version.
    
    My code is:
    
    DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
    factory.setIgnoringElementContentWhitespace(true);
    factory.setIgnoringComments(true);
    SchemaFactory sFact =
    SchemaFactory.newInstance(XMLConstants.W3C_XML_SCHEMA_NS_URI);
    
    factory.setSchema(sFact.newSchema(new java.io.File(SCHEMA_FILE)));
    
    DocumentBuilder builder = factory.newDocumentBuilder();
    builder.setErrorHandler(new ErrorHandler() {
    public void warning (SAXParseException exception) throws SAXException
    {
    System.err.println(exception);
    }
    public void error (SAXParseException exception) throws SAXException {
    System.err.println(exception);
    }
    public void fatalError (SAXParseException exception) throws
    SAXException {
    System.err.println(exception);
    }
    });
    
    org.w3c.dom.Document doc = builder.parse(file);
    
    The error I recieve is:
    
    org.xml.sax.SAXParseException:
    http://www.w3.org/TR/xml-schema-1#cvc-elt.1?note
    org.xml.sax.SAXParseException:
    http://www.w3.org/TR/xml-schema-1#cvc-elt.1?note
    Exception in thread "main" java.lang.IllegalStateException
    at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorHandlerImpl$3.checkState(ValidatorHandlerImpl.java:411)
    at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorHandlerImpl$3.getElementTypeInfo(ValidatorHandlerImpl.java:441)
    at com.sun.org.apache.xerces.internal.jaxp.JAXPValidatorComponent$SAX2XNI.elementAug(JAXPValidatorComponent.java:299)
    at com.sun.org.apache.xerces.internal.jaxp.JAXPValidatorComponent$SAX2XNI.endElement(JAXPValidatorComponent.java:291)
    at com.sun.org.apache.xerces.internal.jaxp.XNI2SAX.endElement(XNI2SAX.java:163)
    at com.sun.org.apache.xerces.internal.jaxp.validation.XNI2SAXEx.endElement(XNI2SAXEx.java:108)
    at com.sun.org.apache.xerces.internal.impl.xs.XMLSchemaValidator.endElement(XMLSchemaValidator.java:818)
    at com.sun.org.apache.xerces.internal.jaxp.validation.ValidatorHandlerImpl.endElement(ValidatorHandlerImpl.java:339)
    at com.sun.org.apache.xerces.internal.jaxp.XNI2SAX.endElement(XNI2SAX.java:163)
    at com.sun.org.apache.xerces.internal.jaxp.JAXPValidatorComponent.endElement(JAXPValidatorComponent.java:206)
    at com.sun.org.apache.xerces.internal.xinclude.XIncludeHandler.endElement(XIncludeHandler.java:790)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanEndElement(XMLDocumentFragmentScannerImpl.java:1241)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(XMLDocumentFragmentScannerImpl.java:1685)
    at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:368)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:834)
    at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:764)
    at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:148)
    at com.sun.org.apache.xerces.internal.parsers.DOMParser.parse(DOMParser.java:248)
    at com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:292)
    at javax.xml.parsers.DocumentBuilder.parse(DocumentBuilder.java:169)
    ...
    
    I am behind a web proxy, and I don't know if the validation process
    involves retrieving files at the URLs in the xml and xsd files, which
    could be the problem.
    
    can someone shed some light on this?
    
    Thanks in advance.
- 7
  - type safety in java 1.5 (bug or hole?)"John C. Bollinger" <email***@***.com> schrieb im Newsbeitrag
    news:c8g89n$esu$email***@***.com...
    
    > It would all the same be a nice complement to generics if the 1.5
    > compiler would indeed issue warnings about user-inserted casts that are
    > not provably correct. (I.e. those that the compiler cannot simply
    > ignore). That would give Bracha's comment (that started this confusion)
    > broad enough scope to no longer be confusing.
    
    I agree very much.
    
    BTW, there's another comment from Bracha in the very same paper that's
    confusing (me): He says "The Java virtual machine does not directly support
    overriding of methods with different return types. This feature is supported
    by the compiler.". What does this mean? Does this mean that the different
    return types are gone at run time? Here's an example:
    
    static class A {
    static A create() { return new A(); }
    public A m(A a) { System.out.println("A->A"); return a; }
    }
    
    static class B extends A {
    static B create() { return new B(); }
    public B m(A a) { System.out.println("A->B"); return (B) a; }
    public B m(B b) { System.out.println("B->B"); return b; }
    }
    
    public void testOverriding() {
    A a_a = A.create(); // static type A, dynamic type A
    A a_b = B.create(); // static type A, dynamic type B
    B b_b = B.create(); // static type B, dynamic type B
    
    A a2 = a_a.m(a_b); // prints: A->A
    A a3 = a_a.m(b_b); // prints: A->A
    
    A a5 = a_b.m(a_b); // prints: A->B <== overriding works
    A a6 = a_b.m(b_b); // prints: A->B <== overriding works
    
    B b2 = b_b.m(a_b); // prints: A->B
    B b3 = b_b.m(b_b); // prints: B->B
    }
    
    public void testReflection() {
    try {
    System.out.println(
    B.class.getMethod("m", new Class[] {A.class}).getReturnType()
    == B.class
    ); // prints: true <== reflection works, too
    }
    catch (Throwable t) {
    throw new RuntimeException("Laufzeitfehler", t);
    }
    }
    
    So there's obviously some runtime support for overriding methods with a
    different return type, because in this example both the overriding and the
    reflection worked. Then what did Bracha mean?
    
    2004-05-24, York.
    --
    werres at uni minus bremen.de
    http://www.uni-bremen.de/~werres
- 8
  - where is the maximize button in JDialog?Anybody knows how to get a JDialog to display a maximize
    button like a JFrame does? The default JDialog does not come with
    maximize or minimize button? I checked out the API for JDialog and
    could not find the answer. Can anybody help me out?
- 9
  - Applets and J2SE 5.0 - problems?I set my IE browser (corporate edict to use IE...ugh)
    to use the 9/30 FCS release of 5.0
    
    Whenever I visit a page with an applet, the browser
    crashes.
    
    Someone at our local user group (www.javasig.com)
    mentioned something about version mismatches (???).
    
    Anyone else experience this?
    
    btw, kudos to Calvin Austin (J2SE 5.0 spec lead) and
    the rest for a very organized and efficient release.
    
    Frank G.
    +==========================================+
    | Crossroads Technologies Inc. |
    | www.CrossroadsTech dot com |
    | fgreco at REMOVE!cross!roads!tech!dot com|
    +==========================================+
- 10
  - tomcat/applet question...this is really weird, in tomcat/webapps/<appName>I have a jsp AND an
    applet.. I'm using a package called smack for writing jabber clients
    (http://www.jivesoftware.org/smack/), so:
    
    in jsp:
    <%@ page import="org.jivesoftware.smack.*"%>
    no problems...
    
    in applet:
    import org.jivesoftware.smack.*;
    when try to compile get told this package doesn't exist...
    
    package is where all packages are supposed to be in Tomcat
    (C:\tomcat\common\lib) and, again, the jsp has no problems with it, but
    the applet, which is in exact same location as jsp, for some reason
    can't find it..
    
    (in applet am even getting en error (identifier expected) on
    system.out.println()... don't know what to make of this..
    this is line: System.out.println("test");...)
    
    weird thing is, if I hide System.out.println() line get told package
    smack doesn't exist.. if I don't hide System.out.println() line get
    ONLY identifier-expected error on System.out.println() line..
    
    would appreciate any help... thank you.. Frances
- 11
  - data lost issue using socketsHi,
    
    I have an interesting issue with socket programming.
    
    I would like to send String based information via Sockets.
    
    As it could happen, that a part of the information gets lost on its
    way to the client, I would like to send before all such packages the
    size of the package as a "short" value (or something equal, but not
    string because you can never be sure that your string completely
    arrived ).
    
    Does anybody know what is an elegant solution for this problem?
    
    I send the strings using:
    
    PrintWriter out = new PrintWriter(client.getOutputStream(), true);
    out.println("test");
    
    Thanks,
    
    korcs
- 12
  - gui builder for javaHi,
    
    I just started programming java and I am looking for a free gui builder for
    java on linux or windows platforms. Where can I find it.
    
    thanks
    
    Johan
- 13
  - using parameterized ArrayListI am trying to read write <Event> objects to an ArrayList ... but when
    I try to convert the arraylist back to the object arrayit gives me a
    ClassCastException for the line
    
    return (Event[]) a.toArray();
    
    --------------------------------------
    BufferedReader ois = null;
    ArrayList<Event> a = new ArrayList<Event>();
    try {
    
    ois = new BufferedReader(new FileReader(this.calFile));
    
    Event e = null;
    String line;
    
    while ((line = ois.readLine()) != null) {
    e = new Event(line);
    a.add(e);
    }
    ois.close();
    } catch (FileNotFoundException e) {
    
    e.printStackTrace();
    } catch (IOException e) {
    
    e.printStackTrace();
    } catch (ParseException e) {
    
    e.printStackTrace();
    } catch (InvalidTimeRangeException e) {
    
    e.printStackTrace();
    }
    if (a.isEmpty())
    return null;
    return (Event[]) a.toArray();
- 14
  - Form doesn't submit onUnload in NetscapeDear Netscape/Javascript/Java gurus,
    
    I am trying to submit a form onUnLoad when the user accidentally
    closes the browser before clicking on a link to complete the
    transaction.
    
    On IE, this works fine.
    But on Netscape or Mozzilla browsers, the form would simply not submit
    when
    the browser is closed.
    
    here is the code.
    <script language="JavaScript">
    function CheckWindowClosed() {
    document.MyForm.submit();
    }
    </script>
    
    <body onLoad="FunctionHandler();" onUnload="CheckWindowClosed();">
    
    Kindly let me know if there is any workaround or fix where I can get
    this working on Netscape.
    
    Thanks and Regards,
    Yash
- 15
  - Unicode value of a characterHi,
    
    I am a beginner in Java programming and I would like to know which
    code ( program ) I must write to get the Unicode value of any
    character ?
    
    Thank you very much for your help !
    
    JPR105.