Java applications aren't standalone programs, but run by a Java interpreter. As a consequence, you can't configure a Java chess engine application directly as a engine under a chess GUI, but you have to configure the Java interpreter program java.exe as chess engine. Typical pathes for the Java interpreter program are:
jlaunch is a native C program for Windows, that is similar to the Java JDK/JRE java.exe command. # The program uses the function JNI_CreateJavaVM of the Java Invocation API to create a JVM in the current process.
The function JNI_CreateJavaVM is loaded at runtime via LoadLibrary/GetProcAddress from the choosen jvm.dll file.
You can find more details about JNI (Java Native Interface) at
Copy the jlaunch program into the directory of your Java chess engine and create the proper jlaunch.properties file (see examples properties files below).
Usually the chess GUIs use the directory, where the program is located as the working directory. In case of a Java chess engine application this would be under the JDK/JRE installation path and not where the files of the Java chess engine are located. With jlaunch located in the same directory, you can address other files (e.g. engine specific opening books) relative to the location of your Java chess engine application.
jlaunch reads the configuration data from the properties file jlaunch.properties. The format of lines in this file is:
Lines, that begin with a hash (#) in the first column are handled as comments.
jlaunch runs under Windows 2000 and Windows XP (other Windows versions aren't available for me so I don't know, whether jlaunch will run). The minimum needed Java version is Sun Java 1.2 but I strongly recommend to use either Java 1.3.1 or even better Java 1.4.2. The upcoming Java 1.5 is also suported.
Microsoft Java is more or less compatible to Sun Java 1.1.4 and therefore not supported.
jlaunch - Java launcher for Windows 2000/XP. Copyright (c) 2004 Manfred Rosenboom All rights reserved. This program is FREEWARE. You can redistribute it as long as you don't charge for it, or include it in a product which is distributed for profit. It is forbidden to change, split, copy, sell, disassemble or produce any changed form of this program release without the written permission of the author. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Ready to use property files for various Java chess engines.
Just rename the desired file to jlaunch.properties.
|Cheetah 0.79a||UCI / WB|
|Pyotr Amateur 0.6||WB|
|Author||Bernhard von Gunten|