java-programmer >>javap: fully qualified names for "new" statements

javap: fully qualified names for "new" statements

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    also is a problem.

Author

Message

S.Marion

Posted: 2006-3-3 1:00:00

Top

java-programmer, javap: fully qualified names for "new" statements Hello,

I'm using javap for my project.
Basically, what I'm interested in are the "new", "newarray" and
"anewarray" statements.
However, javap only outputs things like:
new #10; //class StringBuffer

but does not give me the fully qualified name.

Is there any way I could get to know this information?

Cheers,

Sebastien Marion

S.Marion

Posted: 2006-3-3 1:13:00

Top

java-programmer >> javap: fully qualified names for "new" statements Opologies for the previous email, I found the answer to my question.
I'm not sure there is a way to get the fully qualified name outputed by
javap.
However, when using the -verbose flag, javap outputs at the beginning of
the dump things like :
const #1 = class #2; // Runtime
const #2 = Asciz java/lang/Runtime;
const #3 = class #4; // Object
const #4 = Asciz java/lang/Object;
const #5 = Asciz securityManager;
const #6 = Asciz Ljava/lang/SecurityManager;;
const #7 = Asciz defaultProperties;
const #8 = Asciz Ljava/util/Properties;;
const #9 = Asciz current;
const #10 = Asciz Ljava/lang/Runtime;;
const #11 = Asciz libpath;
const #12 = Asciz [Ljava/lang/String;;
const #13 = Asciz exitSequence;
and so on.
This is then where I can get the fully qualified name from ;)

Cheers,
Sebastien Marion

S.Marion wrote:
> Hello,
>
> I'm using javap for my project.
> Basically, what I'm interested in are the "new", "newarray" and
> "anewarray" statements.
> However, javap only outputs things like:
> new #10; //class StringBuffer
>
> but does not give me the fully qualified name.
>
> Is there any way I could get to know this information?
>
> Cheers,
>
> Sebastien Marion

Roedy Green

Posted: 2006-3-3 9:33:00

Top

java-programmer >> javap: fully qualified names for "new" statements On Thu, 02 Mar 2006 17:13:28 +0000, "S.Marion" <email***@***.com>
wrote, quoted or indirectly quoted someone who said :

>This is then where I can get the fully qualified name from ;)

You need a more refined tool. See http://mindprod.com/jgloss/jasm.html
to look for libraries to help you examine byte code. The string you
want is in the literal pool. There will be a reference to it an a
fixed offset. Read the class library format spec at the link I gave.

the reference comes right after the access flags. Get a hex viewer to
let you look at the first few bytes and the constant pool. It is all
pretty much the way you would expect.

A string reference is simply an index into the constant pool array
which then points you to where the string itself is and how long it
is.
--
Canadian Mind Products, Roedy Green.
http://mindprod.com Java custom programming, consulting and coaching.

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- 4
  - help with java assignmentWas just hoping someone could shed a bit of light on how to approach
    this assignment. It would seem we have to determine the value of a in
    order to determine how many times the method m() is called, but there
    doesn't seem to be enough information to determine a's value. Any tips
    would be greatly appreciated...
    
    Many Thanks
    
    For each of the following snippets of code, give the number of times
    method m() is called, with a brief explanation. Assume that a and b are
    nonnegative integers.
    Snippet A
    
    for (int i = a; i < a*a; ++i) {
    m();
    }
    int i = 0; int j = a;
    while (i <= j) {
    ++i;
    m();
    --j;
    }
    
    Snippet B
    
    For this one, first we define a method m1:
    
    public static void m1(int a) {
    for (int i = 0; i <= a*a; ++i) {
    m();
    }
    }
    
    Now the snippet:
    
    m1(a*a);
    
    Snippet C
    
    for (int i = a; i != a + b; i += 2) {
    for (int j = a/2; j > 0; --j) {
    for (int k = 1; k < a; ++k) {
    m();
    }
    }
    }
    
    Snippet D
    
    for (int i = 0; i < a; ++i) {
    for (int j = 148; j < i; ++j) {
    m();
    }
    }
- 5
  - Automatically install java plug-inHello,
    How can I automatically install (Internet explorer install dialogbox) the
    java plugin from my HTML page.
    
    Need sample code, please.
    
    Thanks :)
- 6
  - RMI between Java 1.4 and Java 1.5 problemWhen attempting to RMI between a 1.4 client and a 1.5 server ( with a
    1.5 interface, remote object, stubs and skeletons using the -vcompat
    rmic flag ), I get the following error:
    
    java.lang.ClassNotFoundException:
    java.rmi.server.RemoteObjectInvocation
    Handler (no security manager: RMI class loader disabled)
    
    The plot thickens. The 1.4 client will connect to the 1.5 server if I
    run the 1.4 client classes in a 1.5 jvm. However, when I run the 1.4
    compiled classes in a 1.4 jvm I get no joy.
    
    Any ideas anyone?
    
    The context is this: getting a Java strored procedure in an Oracle
    database running a 1.4 jvm to send "trigger" information to a java
    1.5 server on a different machine.
    
    BTW, the rmi interface is very simple. One method, no return type and
    the only passed parameter is a string.
- 7
  - JApplet Structure ProblemHi,
    
    I can't run this Japplet in a web browser. But the eclipse applet
    viewer works...
    I guess it's beacause we havn't implemented the methods init, start,
    stop and resize.
    Can you post some standard example methods?
    Should we move the code from the main method in the init method?
    
    Any help will be appreciated...
    
    Thanks alot
    
    Dennis
    
    package mn;
    import java.awt.BorderLayout;
    
    import java.awt.Dimension;
    
    import javax.swing.JApplet;
    import javax.swing.JButton;
    import javax.swing.JCheckBox;
    import javax.swing.JComponent;
    import javax.swing.JFrame;
    import javax.swing.JLabel;
    import javax.swing.JPanel;
    import javax.swing.JSlider;
    import javax.swing.JTextField;
    
    public class NewJApplet extends javax.swing.JApplet {
    private JPanel jPanel2;
    private JPanel jPanel1;
    private JPanel jPanel3;
    private JPanel jPanel7;
    private JLabel jLabel1;
    private JLabel jLabel4;
    private JPanel jPanel5;
    private JLabel jLabel5;
    private JTextField jTextField2;
    private JSlider jSlider2;
    private JPanel jPanel10;
    private JLabel jLabel3;
    private JPanel jPanel9;
    private JCheckBox jCheckBox1;
    private JPanel jPanel6;
    private JPanel jPanel4;
    private JSlider jSlider1;
    private JLabel jLabel2;
    private JButton OK;
    private JTextField jTextField1;
    private JButton jb1;
    private JButton jb2;
    
    {
    //Set Look & Feel
    try
    {
    javax.swing.UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
    } catch(Exception e) {
    e.printStackTrace();
    }
    }
    
    /**
    * Auto-generated main method to display this
    * JApplet inside a new JFrame.
    */
    public static void main(String[] args) {
    JFrame frame = new JFrame();
    NewJApplet inst = new NewJApplet();
    // inst.setSize(500,500);
    frame.getContentPane().add(inst);
    //((JComponent)frame.getContentPane()).setPreferredSize(new
    java.awt.Dimension(
    // 500,
    // 500));
    // frame.setSize(500,500);
    frame.pack();
    // ((JComponent)frame.getContentPane()).setPreferredSize(new
    java.awt.Dimension(
    // 500,
    // 500));
    // frame.setSize(500,500);
    // inst.setSize(500,500);
    frame.setVisible(true);
    }
    
    public NewJApplet() {
    super();
    initGUI();
    }
    
    private void initGUI() {
    try {
    BorderLayout thisLayout = new BorderLayout();
    getContentPane().setLayout(thisLayout);
    //this.setSize(576, 300);
    {
    jPanel2 = new JPanel();
    getContentPane().add(jPanel2, BorderLayout.NORTH);
    //jPanel2.setPreferredSize(new java.awt.Dimension(576, 78));
    }
    {
    jPanel1 = new JPanel();
    getContentPane().add(jPanel1, BorderLayout.SOUTH);
    BorderLayout jPanel1Layout = new BorderLayout();
    jPanel1.setLayout(jPanel1Layout);
    //jPanel1.setPreferredSize(new java.awt.Dimension(576, 103));
    {
    jPanel3 = new JPanel();
    
    BorderLayout jPanel3Layout = new BorderLayout();
    jPanel3.setLayout(jPanel3Layout);
    //jPanel3.setPreferredSize(new java.awt.Dimension(361, 113));
    {
    jPanel7 = new JPanel();
    
    jPanel7.setPreferredSize(new java.awt.Dimension(600, 35));
    {
    jLabel2 = new JLabel();
    jPanel7.add(jLabel2);
    jLabel2.setText("Signal");
    jLabel2.setPreferredSize(new java.awt.Dimension(
    58,
    17));
    }
    {
    jSlider1 = new JSlider();
    jPanel7.add(jSlider1);
    }
    {
    jTextField1 = new JTextField();
    jPanel7.add(jTextField1);
    jTextField1.setText("1000");
    }
    {
    jLabel1 = new JLabel();
    jPanel7.add(jLabel1);
    jLabel1.setText("Hz");
    }
    {
    jb1 = new JButton();
    jPanel7.add(jb1);
    jb1.setText("OK");
    
    }
    jPanel3.add(jPanel7, BorderLayout.NORTH);
    }
    
    {
    jPanel10 = new JPanel();
    
    //jPanel10.setPreferredSize(new java.awt.Dimension(
    // 339,
    // 35));
    {
    jLabel4 = new JLabel();
    jPanel10.add(jLabel4);
    jLabel4.setText("Abtastung");
    jLabel4.setPreferredSize(new java.awt.Dimension(
    58,
    17));
    }
    {
    jSlider2 = new JSlider();
    jPanel10.add(jSlider2);
    }
    {
    jTextField2 = new JTextField();
    jPanel10.add(jTextField2);
    jTextField2.setText("1000");
    }
    {
    jLabel5 = new JLabel();
    jPanel10.add(jLabel5);
    jLabel5.setText("Hz");
    }
    {
    jb1 = new JButton();
    jPanel10.add(jb1);
    jb1.setText("OK");
    
    }
    jPanel3.add(jPanel10, BorderLayout.SOUTH);
    }
    jPanel1.add(jPanel3, BorderLayout.WEST);
    }
    {
    jPanel4 = new JPanel();
    
    BorderLayout jPanel4Layout = new BorderLayout();
    jPanel4.setLayout(jPanel4Layout);
    //jPanel4.setPreferredSize(new java.awt.Dimension(186, 68));
    {
    jPanel6 = new JPanel();
    jPanel4.add(jPanel6, BorderLayout.NORTH);
    {
    jCheckBox1 = new JCheckBox();
    jPanel6.add(jCheckBox1);
    jCheckBox1.setText("Abtastungspunkte");
    }
    }
    {
    jPanel9 = new JPanel();
    jPanel4.add(jPanel9, BorderLayout.CENTER);
    //jPanel9
    // .setPreferredSize(new java.awt.Dimension(202, 53));
    {
    jLabel3 = new JLabel();
    jPanel9.add(jLabel3);
    jLabel3.setText("Abtasttheorem ist erf黮lt");
    }
    {
    OK = new JButton();
    jPanel9.add(OK);
    OK.setText("Reset");
    }
    }
    {
    jPanel5 = new JPanel();
    jPanel4.add(jPanel5, BorderLayout.WEST);
    }
    jPanel1.add(jPanel4, BorderLayout.EAST);
    }
    }
    } catch (Exception e) {
    e.printStackTrace();
    }
    }
    
    }
- 8
  - Java Parallel Port Programming with the Java Communications APII've read some messages on here regarding the Java Communications API
    and the problems some have had with writing to parallel ports. I also
    was puzzled by why I couldn't get this to work and then finally
    figured out something that worked for me so am sharing this.
    
    First of all, I am using Linux, downloaded the RXTX software,
    downloaded the Sun x86/Solaris drivers for the Comm API (yes you need
    this even for Windows/Linux), and installed per the instructions.
    There were a few snags but the instructions contain much of what you
    need to get past these.
    
    The main problem I had was with properly wiring the cable from the
    parallel port to drive my external circuits. You definately need some
    sort of buffer chips to provide the interface from/to the parallel
    port and your external devices (i.e. motors, LEDs, etc) and of course
    power that circuit with an external 5V supply. That wasn't the problem
    for me though. I had my data lines from the parallel port connected to
    drive the external device...but it wasn't working with the Java
    Communications API.
    
    After some more tinkering, the trick was to tie the parallel port
    status lines 10 & 11 (Ack and Busy) to low/ground and lines 12, 13, &
    15 (paper out, select, & error) to high/5V. This should be done
    through the output of a buffer chip though. I also tied lines 18-25 to
    low/ground.
    
    With that, the Java Communications API worked like a charm. The OS and
    driver software must cleary require that the status input lines be
    broadcasting signals that indicate the external device is OK...and by
    tying the status lines mentioned to the proper signal levels...it
    looks as if the external device is OK (i.e. no errors, not busy, has
    paper, etc).
    
    Previously, I had the status lines all tied to ground or had them
    floating. After looking at a parallel port spec, I figured out what
    the status lines are signalling to the system.
    
    I hope this helps some of you trying to do something similar.
    
    Regards,
    
    Paul
    
    /******************************************************************/
    Paul J. Perrone
    Assured Technologies, Inc.
    Web: www.assuredtech.com
    Author of various books on J2EE, Java, XML, and Web
    Services: http://www.assuredtech.com/books_page.htm
    Recently completed project includes the
    "J2EE Developer's Handbook" geared for J2EE v1.4.
    /******************************************************************/
- 9
  - Java programmer in the London area?Hello,
    
    A friend is looking for a Java programmer in the London area. He has a
    small company and one software product. This application may be part
    of an EU funded project.
    
    Any one interested and available?!
    
    Cheers
    
    Geoff
- 10
  - From JAVA to EXE without the JRE
    "Emil" <email***@***.com> wrote in message
    news:email***@***.com...
    > I would like to find a software or a way to have all my classes in my
    > application as well as the .dll that I have (from C++) installed into
    > one executable.
    >
    > Any suggestions will be appreciated.
    >
    > Or, can I have the JRE encapsulated somehow, and later unzip in the
    > same directory so that the program would run ?
    >
    > Emil
    >
    
    I think a lot of IDE's have the jre with the install package. Try doing a
    search of various installers. I think a popular one is InstallAnywhere
    (www.zerog.com).
- 11
  - SocketServer accept() fails to work (Linux)Hello,
    
    I have the following problem with my server appllication:
    
    This is typical server implemented in Java, using ServerSocket object,
    waiting for client to connenct on ServerSocket.accept()
    method. When the client connects (socket is received from accept() method)
    it is handled by the server in separate thread.
    The server writes the received data to the file and then closes the socket.
    The problem:
    the server handles about 20 connections daily, receiving about 100kB - 1MB
    of data in each connection.
    However after a few days the server fails to work,
    the server waits on ServerSocket.accept() (as usually), however the clients
    fail to connect to the server, but the server does not see
    that any client tried to connect to it, it just waits on
    ServerSocket.accept().
    
    I'm using jre1.4.2_04 on Linux - Red Hat 9
    
    Is there some bug in java-Linux-socket implementation or in my code ?
    Thanks in advance.
    
    This is the result of system netstat (after a few clients failed to connect
    to the server):
    
    tcp 78 0 localhost:32323 localhost:2560 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2568 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2576 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2584 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2340 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2592 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2348 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2344 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2356 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2352 CLOSE_WAIT
    tcp 78 0 localhost:32323 localhost:2608 CLOSE_WAIT
    
    A snippet of the server source:
    
    private class Server
    {
    private ServerSocket _serverSckt = null;
    private boolean _break = false;
    
    ServerRunnable()
    {
    _serverSckt= new ServerSocket(32323);
    _serverSckt.setSoTimeout(2000);
    }
    
    public void exeServer()
    {
    try {
    Socket clientSckt = null;
    while (!_break)
    {
    try {
    clientSckt = _serverSckt.accept();
    
    } catch (SocketTimeoutException ex) {
    // ok, timeout occured, while loops again
    } catch (InterruptedIOException ex) {
    final String sMsg = "_serverSckt Interrupred!!!
    managed to transfer " + ex.bytesTransferred + " [bytes]";
    _LOGGER.error(sMsg, ex);
    }
    
    if (clientSckt != null) {
    
    getClientHandler().handleClient(clientSckt); //
    handles client in separate thread
    // note: clientSckt is closed by client handler
    
    clientSckt = null;
    }
    }
    } catch (IOException e) {
    _LOGGER.error(e);
    } catch (Throwable thr) {
    _LOGGER.fatal(thr);
    } finally {
    _serverRunning = false;
    try {
    _serverSckt.close();
    } catch (IOException e) {
    Assert.catchReport(e);
    }
    }
    }
    }
- 12
  - Eclipse - problem with external tool path name.I am running Eclipse 3.2 with on Windows with WebSphere WSAdmin set up
    as an external tool. WSAdmin is basically a bat file that executes a
    Java program. It takes a number of parameters one of which can be a
    file containing properties.
    
    External tool: C:\IBM\WAS51\DeploymentManager\bin\wsadmin.bat
    
    Working directory ${workspace_loc:/WSAdmin}
    
    Arguments:
    
    -lang jacl
    -host localhost -port 8879
    -f ${resource_loc} ${resource_loc:/WSAdmin/WAS5.1/propertyFiles/Aquila/
    aquila.properties}
    
    The property file name "${resource_loc:/WSAdmin/WAS5.1/propertyFiles/
    Aquila/aquila.properties}" gets converted to
    "C:homepatrickeclipseWSAdminCVSWSAdminWAS5.1propertyFilesAquilaquila.properties
    "
    
    Obviously the back slashes are being escaped. Is there any way I can
    prevent this?
    
    I have already tried "${resource_loc:\\WSAdmin\\WAS5.1\\propertyFiles\
    \Aquila\\aquila.properties}" without success.
    
    ERROR: file
    C:homepatrickeclipseWSAdminCVSWSAdminWAS5.1propertyFilesAquilaquila.properties
    does not exist.
- 13
  - The Smallcap Journal vINSIDE INFO ALERT
    This advisory is based on exclusive insiders/agents information. (NHVP.PK)
    NHVP has provided investors with 1000% + gains during the real estate boom, and now with the sector at its bottom, is ready to provide with results yet again..
    
    OCT 13th: Northeast Development Corp. to Receive Funding from European Investment Firm. Preliminary discussions suggest figures of -3 million with a combination of real estate and equity collateralization.
    
    GET IN ON MONDAY NOV 6th:
    at 08 cents its a STEAL
    
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    The key to any tade is buying low and selling high, WELL the REAL ESTATE market has bottomed out and time to get in is now. We specialise in calling market bottom and when it comes to REAL ESTATE THIS IS THE BOTTOM, SO GET IN FOLKS
    EARLY RETIREMENT IS CALLING
    EARLY RETIREMENT IS CALLING
    
    The NTSB's update outlined factual information about the crash, but did not conclude what the probable cause of the crash was. The full board will likely vote on a ruling at a later date.
    Funeral services were also scheduled over the next several days for firefighters Jess McLean, 27, of Beaumont; Daniel Hoover-Najera, 20, of San Jacinto; Mark Loutzenhiser, 43, of Idyllwild; and Pablo Cerda, 23, of Fountain Valley. A public memorial service for all five men was planned for Sunday.
    Oyler was charged with five counts of murder, 11 counts of arson and 10 counts of use of an incendiary device. The charges include seven fires in June, one in July, one in September and two in October.
    The National Transportation Safety Board said the wind, coupled with the pilot's inability to turn sharply, forced the aircraft away from its intended path over the East River and into the building.
- 14
  - java assembler pjb[[[ Google probably will join this post to the 2003-01-03 thread of
    the same name, your newsreader may be less helpful. ]]]
    
    Kindly offline I was asked to confirm ...
    
    Yes, instructions appear at:
    http://groups.google.com/groups?threadm=2695edf1.0301031438.6fb5cd8%40posting.google.com
    
    Yes I can fetch 48,910 bytes from:
    http://members.aol.com/plforth/pjb.zip
    
    Yes that .zip contains the compressed folder pjb/.
    
    pjb/README.txt tells us nothing new except that I am
    mailto:email***@***.com and we can click thru to pjb/cshlog.txt. In
    turn, pjb/cshlog.txt suggests ..
    
    Three steps:
    
    --- 1) a procedure to produce the disassembly
    HelloWorldAppJavaAssembler.java:
    
    cd pjb
    javac HelloWorldApp.java pjb/JavaAssembler.java
    cp -ip HelloWorldApp.class HelloWorldApp.bin
    java pjb.JavaAssembler HelloWorldApp
    
    --- 2) A procedure to reassemble the disassembly:
    
    javac HelloWorldAppJavaAssembler.java
    rm HelloWorldApp.class
    java HelloWorldAppJavaAssembler
    
    --- 3) A comparison to show we have reassembled precisely the same
    .class file:
    
    diff HelloWorldApp.bin HelloWorldApp.class
    
    Pat LaVarre
    
    P.S. I ran this example in Mac OS X, with ships with javac installed,
    even if you do not install the Developer's Disk. Linux with Java
    should work identically. Windows with Java syntax for these is as
    shown except `copy /-y` and `del` and `fc /b` for what here appears as
    `cp -ip` and `rm` and `diff`.
- 15
  - Where is the Information Systems industry headed?Our university is doing some survey work to consider where the world
    of IS is headed. Since most of those here work in that world, I'm
    interested in your thoughts, especially if you think you have a good
    feel for job skills needed now and job skills needed in the future.
    
    The question is sort of two pronged.
    
    First, where are IS jobs headed? Will there continue to be a
    significant demand for programming skills? What type of analysis
    skills (especially in terms of those that can be developed
    academically) are important? Are the requirements changing -- will
    things look different in the next five to ten years?
    
    Second, what are the specific things you would think IS majors should
    understand when leaving the university? Do you think any of those
    things are going to change in the next 5-10 years?
    
    Those are broad questions since I want to leave a lot of room for your
    thoughts. I'd like to have some idea of what your role is in your
    business and what type of business you are in if you answer (I know
    some people don't like to give specifics on here and that's fine --
    just "we are a manufacturing company, or I'm a private consultant" is
    enough).
    
    Lastly, I'd point out that I'm not interested in specific language
    skills, etc. I'm not interested in starting another Sun/Microsoft war
    or anything like that. Our philosophy is that even if we use Java/Sun
    products for everything we do, you ought to be able to go into a shop
    using Smalltalk or .Net or whatever and get up to speed quickly -- so
    it's the broader concepts that I'm referring to.
    
    I don't know whether I'll reply to all responses unless I'm looking
    for clarification, but I promise I'll give all serious consideration.
    
    Thanks for any ideas,
    
    Marty McMahone
    University of Mary Hardin-Baylor
    Texas