The following code opens two references to a zip file, closes one, and then attempts to read from an entry in the file:

import java.util.zip.*;
import java.util.jar.*;
import java.util.*;
import java.io.*;

public class ZipTest {

    public static void main(String[] args) throws Exception {
        InputStream is = null;
        ZipFile zf = new ZipFile(args[0]);
        ZipFile zf2 = new ZipFile(args[0]);
        ZipEntry ze = zf.getEntry(args[1]);
        if (ze == null)
            System.out.println("Cant find ze");
        is = zf.getInputStream(ze);
        zf.close();
        byte[] buf = new byte[128];
        is.read(buf);
    }
}

This code works in 1.4.0 and all previous releases. The read() method throws a ZipException("ZipFile closed.") in 1.4.1 build 08 and later releases. Customer code expects that as long as a single reference to the zip file remains open, the existing input streams should be read.

This bug prevents BEA Weblogic from running on 1.4.1.