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I can get jdb HelloWorld to work from the dos box but not as a TP command (customized tool).
In the XP SP2 dos box,
    E:\>java -version
    java version "1.4.2"
    Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-b28)
    Java HotSpot(TM) Client VM (build 1.4.2-b28, mixed mode)
    
    E:\>cd E:\javaPackages\FoxInfoServer
    E:\javaPackages\FoxInfoServer>javac HelloWorldApp.java
    E:\javaPackages\FoxInfoServer>jdb HelloWorldApp
    Initializing jdb ...
    > run
    run HelloWorldApp
    Set uncaught java.lang.Throwable
    Set deferred uncaught java.lang.Throwable
    >
    VM Started: Hello World!
    "The application exited"

    Interestingly, a previous test ended instead with:
    "The application has been disconnected"
    
    This was run from: C:\j2sdk1.4.2\bin\jdb.exe HelloWorldApp
    but I can't swear whether it used javac or jikes (I thought it was javac).
    At present, the two compiler outputs run identically in TP.

    The PATH environ. var. seems to give C:\j2sdk1.4.2\bin\ priority:
        .;
        c:\PROGRA~1\jikes-1.22\bin;
        C:\WINDOWS;C:\WINDOWS\System32\Wbem;
        C:\SDCC\BIN;
        C:\PROGRA~1\Microsoft Visual Studio\Common\Tools\WinNT;
        C:\PROGRA~1\Microsoft Visual Studio\Common\MSDev98\Bin;
        C:\PROGRA~1\Microsoft Visual Studio\Common\Tools;
        C:\PROGRA~1\Microsoft Visual Studio\VC98\bin;
        C:\j2sdk1.4.2\bin;
        C:\PROGRA~1\Java\jre1.5.0_06\bin;
        ...

Whereas in a TP tools dialog:
    Command:        C:\j2sdk1.4.2\bin\jdb.exe
                    OR jdb
    Parameters:     $BaseName
    Initial Folder: $FileDir
        Initializing jdb ...
        > Internal exception:
        java.io.IOException: The handle is invalid
            at java.io.FileInputStream.readBytes(Native Method)
            at java.io.FileInputStream.read(FileInputStream.java:194)
            ...
        Tool completed successfully

Here's the code (formatting and comment NOT mine):
    class HelloWorldApp {
        public static void main(String[] args) {
            System.out.println("Hello World!"); // Display the string.
        }
    }

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E:\>java -version
    java version "1.4.2"
    Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.2-b28)
    Java HotSpot(TM) Client VM (build 1.4.2-b28, mixed mode)
    
    E:\>cd E:\javaPackages\FoxInfoServer
    E:\javaPackages\FoxInfoServer>javac HelloWorldApp.java
    E:\javaPackages\FoxInfoServer>jdb HelloWorldApp
    Initializing jdb ...
    > run
    run HelloWorldApp
    Set uncaught java.lang.Throwable
    Set deferred uncaught java.lang.Throwable
    >

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     java.io.IOException: The handle is invalid
     at java.io.FileInputStream.readBytes(Native Method)
     at java.io.FileInputStream.read(FileInputStream.java:194)

Code: Select all

    class HelloWorldApp {
        public static void main(String[] args) {
            System.out.println("Hello World!"); // Display the string.
        }
    }