On JDK-1.3-F,
java.util.jar.JarEntry constructor JarEntry(String name) causes exception.

Please compile and run following.
--- Sample -----
import java.util.jar.JarEntry;

public class JE{
public static void main(String args[]) {
JarEntry je = new JarEntry("Entry Name");
System.out.println(" JarEntry = "+je );
}
}
--- Sample -----
An exception occurs and it stops.

Exception in thread "main" java.lang.UnsatisfiedLinkError: initIDs
        at java.util.zip.ZipEntry.<clinit>(ZipEntry.java:51)
        at JE.main(JE.java, Compiled Code)

It works correctly on JDK-1.2.2-U.