Prolog written in Java

Anybody knows a Prolog Machine written in Java?
Where can I download it?
Thanks

there is a prolog interpreter (compiler???) in the gnu website http://www.gnu.org
its called JProlog

Similar Messages

Open Innovation Call: abap interpreter written in java

Like part of the Open Innovation Call initiative: /people/ignacio.hernndez/blog/2006/12/22/open-innovation-call ,
I begin this forum thread to open the discussion about "JAbap project":
I know JRuby...is there something like a abap interpreter written in java? ..java and abap using the same virtual machine....?

Hello I have the same problem, were you able to execute the WS through the JS code now?
I would like to call an ABAP WS using JavaScript to return complex structures that I would like to manage directly with JS.
I tried with this code and I get the error "RaiseError: Acrobat Raise." when the request is executed:
var WSUrl = "http://<server>:<port>/sap/bc/srt/wsdl/bndg_4D15C75529330AF1E10000000A150429/wsdl11/allinone/ws_policy/document?sap-client=500";
var VendorNumber = xfa.form.DATA.DATAFLOW.SF_HEADER.VENDOR_NUMBER.rawValue;
try {
// Create request structure, read Input out of text field
var request = {
          "urn:sap-com:document:sap:soap:functions:mc-style:ZWsTest" : {ILifnr: VendorNumber}
SOAP.wireDump = true;
// Call web service using SOAP object
var response = SOAP.request ({
        cURL: WSUrl,
        oRequest: request
//        cAction: "urn:sap-com:document:sap:soap:functions:mc-style"
} catch (e) {
    xfa.host.messageBox(e.toString()); //pop-up "TypeError:service.CelsiusToFahrenheit is not a funciton"
with this other code I get the error "SOAPError: CX_ST_MATCH_ELEMENT:XSLT exception.System expected element 'ILifnr'":
try {
    var myProxy = SOAP.connect(WSUrl);
    var result = myProxy.ZWsTest( { ILifnr: VendorNumber } );
    xfa.form.DATA.DATAFLOW.SF_HEADER.E_DESCRIPTION.rawValue = result;
// Display the response in the console:
   console.println("Result is " + result);
} catch (e) {
    xfa.host.messageBox(e.toString()); //pop-up "TypeError:service.CelsiusToFahrenheit is not a funciton"
in the second option, if I make the field ILifnr optional the call is succesfully performed but the parameter is not passed to the WS. So the call is working.
Using stand-alone LiveCycle designer 8.1 and Adobe Reader 8
Any suggestions?
Many thanks,
G.
Edited by: Guillem Mateu Navalón on Jan 13, 2011 1:13 PM

How to ensure applet is written in java card?

Hi all,
I have written a java card applet, in which i am using the Biometry API of java card to enroll a fingerprint template in java card. Code is attached below:
package classicapplet1;
import javacard.framework.*;
import javacardx.biometry.BioBuilder;
import javacardx.biometry.OwnerBioTemplate;
import javacardx.biometry.SharedBioTemplate;
import javacardx.biometry.BioException;
public class JavaBiometrics extends Applet implements SharedBioTemplate{
        public final static byte CLA = (byte)0xCF;
     public final static byte INS_ENROLL = (byte)0x10;
     public final static byte MATCH_TRY_LIMIT = (byte)3;
     public final static byte INVALID_DATA = (byte)0x77;
     public final static byte ERROR_MATCH_FAILED = (byte)0x9101;
     public static final byte CARD_ENROLL_SUCCESS = (byte)0x9000;
     public static final byte CARD_ENROL_FAILED = (byte)0x6900;
     private OwnerBioTemplate bio_temp;
     * Installs this applet.
     * @param bArray
     *            the array containing installation parameters
     * @param bOffset
     *            the starting offset in bArray
     * @param bLength
     *            the length in bytes of the parameter data in bArray
    public static void install(byte[] bArray, short bOffset, byte bLength) {
        new JavaBiometrics(bArray, bOffset, bLength);
     * Only this class's install method should create the applet object.
    protected JavaBiometrics(byte[] bArray, short bOffset, short bLength) {
    byte aidLen = bArray[bOffset];
          if(aidLen == (byte)0)
               register();
          else
               register(bArray, (short)(bOffset+1), aidLen);
          bio_temp = BioBuilder.buildBioTemplate(BioBuilder.FINGERPRINT, MATCH_TRY_LIMIT);
public boolean select()
return true;
     * Processes an incoming APDU.
     * @see APDU
     * @param apdu
     *            the incoming APDU
    public void process(APDU apdu) {
        //get the incoming APDU buffer
     byte []buffer = apdu.getBuffer();
     //Get the CLA; mask out the logical-channel info
     buffer[ISO7816.OFFSET_CLA] = (byte)(buffer[ISO7816.OFFSET_CLA] & (byte)0xFC);
     //If the INS Select, return -no need to process select
     if(buffer[ISO7816.OFFSET_CLA] == 0 && buffer[ISO7816.OFFSET_INS] == (byte)(0xA4))
          return;
     //If unrecognized class, return "Unsupported class."
     if(buffer[ISO7816.OFFSET_CLA] != CLA)
          ISOException.throwIt(ISO7816.SW_CLA_NOT_SUPPORTED);
     switch(buffer[ISO7816.OFFSET_INS])
     case INS_ENROLL:
          enroll(apdu);
          break;
     default:
          ISOException.throwIt(ISO7816.SW_INS_NOT_SUPPORTED);
public void enroll(APDU apdu)
        byte[] buffer = apdu.getBuffer();
        short bytesRead = apdu.setIncomingAndReceive();
        bio_temp.init(buffer, ISO7816.OFFSET_CDATA, bytesRead);
        bio_temp.doFinal();
    public Shareable getShareableInterfaceObject(AID clientAID, byte parameter) {
        return this;
///////////// These methods implemets the ShareableBio interface///////////////
public boolean isInitialized() {
        return bio_temp.isInitialized();
    public boolean isValidated() {
        return bio_temp.isValidated();
    public void reset() {
        bio_temp.reset();
    public byte getTriesRemaining() {
        return bio_temp.getTriesRemaining();
    public byte getBioType() {
        return bio_temp.getBioType();
    public short getVersion(byte[] dest, short offset) {
        return bio_temp.getVersion(dest, offset);
    public short getPublicTemplateData(short publicOffset, byte[] dest, short destOffset, short length)
            throws BioException {
        return bio_temp.getPublicTemplateData(publicOffset, dest, destOffset, length);
    public short initMatch(byte[] candidate, short offset, short length) throws BioException {
        return bio_temp.initMatch(candidate, offset, length);
    public short match(byte[] candidate, short offset, short length) throws BioException {
        return bio_temp.match(candidate, offset, length);
Problem :
I have developed this program in Netbeans using java card plug ins. when i am running this program, all the required CAP files and EXP files are generated.
Now, i have to write this applet on java card through a card reader. My card reader is installed in an embedded system GeoAmida with IP 192.133.133.2 and port number 6789.
I have used the following settings for my java card device in Netbeans:
Host : 192.133.133.2
Server URL: http://192.133.133.2:6789/
Card Manager URL: http://192.133.133.2:6789/cardmanager/
HTTP port: 6789
The output shows me that Instances of this program has been successfully has been created on java card.
But the problem is how can i ensure that my applet is been successfully installed on the java card?
The code of host application program, accessing the developed java card applet is given below (it is written in C):
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <smartcard.h>
int main()
     int ret, i, smartcard;
     unsigned char applet_id[100], apdu_len, apdu[300],response[300]={0};
     smartcard_info *context;
     smartcard=CONTACTLESS;
     //smartcard=CONTACT_BOT;
     if((context = smartcard_init(smartcard)) == NULL){
          printf("Smartcard Initi. Failed\n");
          return 0xBB;
     /* checking for smartcard */
     while (1){
          if(ret=smartcard_is_present(context, smartcard)!=0)
               sleep(1);
          else
               break;
     printf("Selecting Applet \n");
     i = 0;
     applet_id[i++]=0x00; applet_id[i++]=0xA4; applet_id[i++]=0x04; applet_id[i++]=0x00; applet_id[i++]=0x06;
     applet_id[i++]=0xA9; applet_id[i++]=0xBF; applet_id[i++]=0xA2; applet_id[i++]=0xB6; applet_id[i++]=0xB1; applet_id[i++]=0x3E; applet_id[i++]=0x7F;
     if ((ret=smartcard_select_applet(context, smartcard, applet_id, i))!=0){
          printf("select applet failed %02x\n",ret);
          return ;
     printf("Applet Selection Success \n");
#if 1
     i=0;
     apdu[i++]=0xCF; apdu[i++]=0x10; apdu[i++]=0x04; apdu[i++]=0x04; apdu[i++]=0x7F;
     //apdu[i++]=0x3F; apdu[i++]=0x00;
     apdu_len = i;
     printf("Sending APDU command\n");
     if ((ret=smartcard_apdu(context, smartcard, apdu, apdu_len, response))!=0){
          printf("apdu failed %d\n",ret);
          //return;
     }else
          printf("APDU Success\n");
     //printf("\n");
#endif
     smartcard_deinit(context);
     return 0;
}The output of this program is showing me that applet is been successfully selected, but APDU selection failed. Please solve this problem as soon as possible, because my project is deadline is not very much far.
Thanks in advance.
Mukul Gupta

Hi Shane,
I am getting error 6a86 which means that value of P1 is less than 1 or more than 8, and we have to change its value to any in between 1 to 8. I did that also but error still remains :(
Please tell me what is reason behind this error. And, i'll try out your previous solution today, Thanks for it.

Performance problem in data replication program written in java

Dear all,
I need your valuable ideas on improving below logic on replicating data fromDB2 to Oracle 9i.We have a huge tables in DB2 to replicate to Oracle side.For one table this taking lot of time.The whole app' is written in java.The current logic is Setting soft delete to specific set of records in oracel table and Reading all records from DB2 table to set only these records in oracle table to 'N' so that deleted records got soft deleted in oralce side.The DB2 query is having 3 table join and taking nearly 1minute.We are updating the oracle table in batch of 100000.For 610275 record update in batch mode it is taking 2.25 hours which has to be reduced to <1hour.The first update to all Y and second update using DB2 query is taking 2.85 hrs.
Do you have any clever idea to reduce this time?? kindly help us.we are in critical situation now.Even new approach in logic to replicate also welcome..

hi,
just remove joins and use for all entries.
if sy-subrc = 0.
use delete adjacent duplicates from itab comparing key fields.(it will increase performance)
then write another select statement.
endif.
some tips:
Always check the driver internal tables is not empty, while using FOR ALL ENTRIES
Avoid for all entries in JOINS
Try to avoid joins and use FOR ALL ENTRIES.
Try to restrict the joins to 1 level only ie only for tables
Avoid using Select *.
Avoid having multiple Selects from the same table in the same object.
Try to minimize the number of variables to save memory.
The sequence of fields in 'where clause' must be as per primary/secondary index ( if any)
Avoid creation of index as far as possible
Avoid operators like <>, > , < & like % in where clause conditions
Avoid select/select single statements in loops.
Try to use 'binary search' in READ internal table. Ensure table is sorted before using BINARY SEARCH.
Avoid using aggregate functions (SUM, MAX etc) in selects ( GROUP BY , HAVING,)
Avoid using ORDER BY in selects
Avoid Nested Selects
Avoid Nested Loops of Internal Tables
Try to use FIELD SYMBOLS.
Try to avoid into Corresponding Fields of
Avoid using Select Distinct, Use DELETE ADJACENT
Go through the following Document
Check the following Links
Re: performance tuning
Re: Performance tuning of program
http://www.sapgenie.com/abap/performance.htm
http://www.thespot4sap.com/Articles/SAPABAPPerformanceTunin

9i lite database written in Java?

Is the Oracle 9i lite database entirely written in Java?

We are interested too, we have Satellite Forms and having many problems for connect to Oracle Lite Database on Palm Device. If you have any other information
for to do it, i will appreciate eternaly.
Jorge
[email protected]
We are interested in installing the Oracle 9i Lite Database standalone for Windows 2000. Can you send me the instructions that you mentioned below in a previous response? In addition, I need to know the size of the database footprint.
Thanks,
Sarah
[email protected]

Is Sun ONE Instant Messaging completely written in Java?

The server and client are written in Java. The multiplexor is written in C.

Sun ONE Instant Messaging essentially consists of 3 key components: the IM Server, the IM Multiplexor(s), and the IM client. IM does require a directory server and a web server but these are not part of the IM product. There is no need to distinguish between the IM Server and the Multiplexor since the Multiplexor may be considered part of the server. The multiplexor was done for a particular reason: to bypass the current Java VM's inability to handle more than 3000 concurrent connections.

Anyone have Huffman Dynamic coding written in java

Hi to all
I am looking for huffman dynamic coding written in java programming. If have it please don't hesitate to help...
Thankx in advance
Jenifer

google for it.
%

Looking for opensource download manager written in java.

Hello,
I know this is a bit off-topic - I hope it does not bother anybody.
I am looking for an opensource download manager written in java to include it into my opensource lan filesharing tool which is mature and proofen.
It has all the search/p2p stuff implemented and working well but download functionality is only very limited.
I already serached on google and sourceforge ... but at least google was not my friend and the projects on SF didn't look that mature.
So if you know one (or even more ;) ) please let me know.
Thank you in advance, lg Clemens

does nobody know a downloadmanager written in java :-/

Programs that have been written in java

I am trying to figure out what i can and cant make in java??
What (big or important) programs have been written in java??

You can do many things!!! You can really do just about anything with java that you can with other programming languages.
PS-Use the robot class for screen capture, use multiple screen captures in delayed succesion to get a list of images that can be animated.

Is Java written in Java?

Is Java written in Java?

No, Java is a platform. Sun say so. Must be true.
http://java.sun.com/java2/whatis/
That link also says that Java is a programming language.
When people talk about "Java", they generally are talking about the Java language.

Prolog engine in Java

Hallo.
I have joined AI project.
This project is based on Java.
We need rule engine like Prolog.
I searched in google and found lots of examples of Prolog engines in java.
Have anyone worked with them?
Are there other ideas in rule managing in java?
Is there something like Prolog engine API for java?
What API-prolog-java project is better?
What is more useful Prolog or Rete-algorithm?

May be I am a bit late but anyway.. There is a small but powerful Java-Prolog project called PROL and it is accessible through the link [http://igormaznitsa.com/projects/prol/index.html|http://igormaznitsa.com/projects/prol/index.html] , it is not an opensource project but it is absolutely free for any kind of use
Edited by: raydac on Sep 14, 2010 2:16 PM

In program written with Java Swing, I can't input Chinese

In program written with Java Swing, I can't input Chinese.
But if I change my language first, then change the input method tu U.S, open the Java Swing application, finally I can input Chinese. I want to know how to fix this bug.
My OS is Mac OS X 10.6.8.
At the JDK version 1.6.0_29, I can input Chinese friendly in Java Swing applications. But after 1.6.0_31, I can't do it anymore. The input methods can input Chinese in other non Java Swing applications so the problem must create by JDK or JRE's Swing part. What's the different between 1.6.0_29's Swing and 1.6.0_31's ? Why ? I heard that Java Swing apps not support Chinese input methods seens 2009... Why haven't fix these yet?

Chazza wrote:
Perhaps you need to change your keyboard layout in Xorg?
https://wiki.archlinux.org/index.php/Ke … ard_layout
Thanks for your answer!
I have tried to change the keyboard layout from "en" to "cn", but it is still not work.
The input method coin on the righttop is right when I change the method.But it still output english even I use ibus-pinyin.There is not a box for my choosing chinese words.
Last edited by Dilingg (2015-05-15 16:18:43)

Call visual prolog program from java

Hi friends,
is there someone help me to call ( run) prolog program from java.
i write a parser with Javacc parser generator and stored parsed information in prolog database and I want create some query in java that work in the prolog file.
how can i combine java and prolog programs. i used visual prolog.
Can someone help me?
Thanks you in advance.
yours sincerely,
ksu

Since visual prolog can produce dll's, you can use JNI:
http://java.sun.com/j2se/1.4.2/docs/guide/jni/index.html

Is it possible to use portal service written in Java?

Hello,
I've written a certain portal service in Java and deployed it to the portal and it is working OK.
My question is if it is possible for .NET developers to use it and it's method in their projects as I am using in my Java and DynPro projects.
Roy

Hi Roy,
What you asked requires interoperability between two very different technology stacks - Java and .NET (which is basically what the .NET PDK does for you).
What you need for this is a mechanism to "translate" between these two stacks. This can be done with various 3rd party tools (that you can buy from companies who specialize in this kind of tools).
BUT
The quick, easy and cheap way is to use the industry-standard of interoperability, which is, as Tsachi told you - Web-Services.
Regards,
Ofer

Has anybody written a Java program to get Source code from a URL ?

Hi,
I have a program written in another language (Not Java) to basically
pull in the source HTM or HTML code, given a URL.
ex. getsource www.any.com output
So, ==> output will contain the source HTM or HTML code of
www.any.com.
Is there a Java program that do the same ? Like to see it.
Please append here, or provide pointer to get it.
Thanks,.... -- gte99te

Here's a quick program that does just that.
I'd suggest taking a look at the Java Tutorial, at it's section on using URLs descibes how to do this, and it shouldn't tank more than 45 minutes to get through.
import java.io.*;
import java.net.*;
public class SavePage{
    public static void main(String[] args) throws Exception
     // make sure we've been given a URL
     if (args.length != 2)
         System.err.println("Usage: java SavePic <URL> <filename>");
         System.exit(1);
     // convert the string argument to a URL
     URL url = new URL(args[0]);
     // open a connection to the resource with the given URL
     URLConnection connection = url.openConnection();
     // get an input stream from the connection, and wrap it in a buffer
     BufferedInputStream bis = new BufferedInputStream(connection.getInputStream());
     // open an output file and get an output stream to it
     FileOutputStream file = new FileOutputStream(new File(args[1]));
     // wrap[ the file's output stream in a buffer
     BufferedOutputStream bos = new BufferedOutputStream(file);
     // read each byte from tne connection, and write it to the file     int b;
     while( (b = bis.read()) != -1 )
         bos.write(b);
     // clean up
     bis.close();
     bos.close();
}

Prolog written in Java

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