FULL PRODUCT VERSION :
java -version
java version "1.5.0_09"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_09-b03)
Java HotSpot(TM) 64-Bit Server VM (build 1.5.0_09-b03, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
Linux stargate-lx1 2.6.17.4 #1 PREEMPT Thu Jul 13 10:57:39 EDT 2006 x86_64 x86_64 x86_64 GNU/Linux

EXTRA RELEVANT SYSTEM CONFIGURATION :
Simply taking the test program included in bug 4953050, is reproducible on Linux 64-bit AMD64

A DESCRIPTION OF THE PROBLEM :
4953050 is fixed in Java SE 6.0. This is a request to backport the fix to Tiger.

As described in bug 4953050 relative to the ia64, the same issue occurs on amd64. The _LP64 declaration of uLong in the zconf.h for zip lib combined with the continued export of symbols from libzip.so which conflict with libz.so keeps any JNI application which also uses the system libz from finding classes.

Output of nm -D libzip.so | grep ' T '
00000000000050c0 T adler32
000000000000b6a0 T allocZip
0000000000005260 T crc32
0000000000005a00 T deflate
0000000000005e00 T deflateCopy
0000000000005d20 T deflateEnd
0000000000005350 T deflateInit_
0000000000005380 T deflateInit2_
0000000000005820 T deflateParams
0000000000005770 T deflateReset
0000000000005620 T deflateSetDictionary
000000000000ce58 T _fini
0000000000005250 T get_crc_table
0000000000008f80 T inflate
00000000000096c0 T inflate_blocks
000000000000a140 T inflate_blocks_free
00000000000095f0 T inflate_blocks_new
0000000000009550 T inflate_blocks_reset
000000000000a1d0 T inflate_blocks_sync_point
000000000000ab30 T inflate_codes
000000000000b150 T inflate_codes_free
000000000000aac0 T inflate_codes_new
0000000000008db0 T inflateEnd
000000000000b2b0 T inflate_fast
000000000000b170 T inflate_flush
000000000000ca20 T InflateFully
0000000000008f60 T inflateInit_
0000000000008e10 T inflateInit2_
0000000000008d50 T inflateReset
000000000000a190 T inflate_set_dictionary
0000000000009360 T inflateSetDictionary
0000000000009420 T inflateSync
0000000000009520 T inflateSyncPoint
000000000000a820 T inflate_trees_bits
000000000000a8f0 T inflate_trees_dynamic
000000000000aa80 T inflate_trees_fixed
00000000000032a0 T _init
000000000000b5f0 T InitializeZip
0000000000004c20 T Java_java_util_jar_JarFile_getMetaInfEntryNames
0000000000003960 T Java_java_util_zip_Adler32_update
0000000000003980 T Java_java_util_zip_Adler32_updateBytes
00000000000038a0 T Java_java_util_zip_CRC32_update
00000000000038c0 T Java_java_util_zip_CRC32_updateBytes
0000000000003d20 T Java_java_util_zip_Deflater_deflateBytes
0000000000004170 T Java_java_util_zip_Deflater_end
0000000000004110 T Java_java_util_zip_Deflater_getAdler
0000000000004120 T Java_java_util_zip_Deflater_getBytesRead
0000000000004130 T Java_java_util_zip_Deflater_getBytesWritten
0000000000003b80 T Java_java_util_zip_Deflater_init
0000000000003a10 T Java_java_util_zip_Deflater_initIDs
0000000000004140 T Java_java_util_zip_Deflater_reset
0000000000003c70 T Java_java_util_zip_Deflater_setDictionary
0000000000004710 T Java_java_util_zip_Inflater_end
00000000000046b0 T Java_java_util_zip_Inflater_getAdler
00000000000046c0 T Java_java_util_zip_Inflater_getBytesRead
00000000000046d0 T Java_java_util_zip_Inflater_getBytesWritten
0000000000004420 T Java_java_util_zip_Inflater_inflateBytes
00000000000042c0 T Java_java_util_zip_Inflater_init
00000000000041c0 T Java_java_util_zip_Inflater_initIDs
00000000000046e0 T Java_java_util_zip_Inflater_reset
0000000000004370 T Java_java_util_zip_Inflater_setDictionary
0000000000004ec0 T Java_java_util_zip_ZipEntry_initFields
0000000000004d70 T Java_java_util_zip_ZipEntry_initIDs
0000000000004900 T Java_java_util_zip_ZipFile_close
0000000000004a10 T Java_java_util_zip_ZipFile_freeEntry
0000000000004a60 T Java_java_util_zip_ZipFile_getCSize
0000000000004910 T Java_java_util_zip_ZipFile_getEntry
0000000000004a90 T Java_java_util_zip_ZipFile_getEntryOffset
00000000000048e0 T Java_java_util_zip_ZipFile_getMappedAddr
00000000000048f0 T Java_java_util_zip_ZipFile_getMappedLen
0000000000004a40 T Java_java_util_zip_ZipFile_getMethod
0000000000004a30 T Java_java_util_zip_ZipFile_getNextEntry
0000000000004a80 T Java_java_util_zip_ZipFile_getSize
00000000000048d0 T Java_java_util_zip_ZipFile_getTotal
0000000000004d50 T Java_java_util_zip_ZipFile_getZipMessage
0000000000004760 T Java_java_util_zip_ZipFile_initIDs
0000000000004800 T Java_java_util_zip_ZipFile_open
0000000000004aa0 T Java_java_util_zip_ZipFile_read
00000000000080c0 T _tr_align
0000000000008340 T _tr_flush_block
0000000000007030 T _tr_init
0000000000008030 T _tr_stored_block
0000000000008570 T _tr_tally
0000000000008d20 T zcalloc
0000000000008d40 T zcfree
0000000000008d00 T zError
000000000000c370 T ZIP_Close
0000000000003950 T ZIP_CRC32
000000000000cc30 T ZIP_FindEntry
000000000000c710 T ZIP_FreeEntry
000000000000c780 T ZIP_GetEntry
000000000000c8e0 T ZIP_GetNextEntry
000000000000c940 T ZIP_Lock
000000000000c360 T ZIP_Open
000000000000c100 T ZIP_Open_Generic
000000000000c960 T ZIP_Read
000000000000cc80 T ZIP_ReadEntry
000000000000cdb0 T ZIP_ReadMappedEntry
000000000000c950 T ZIP_Unlock
0000000000008cf0 T zlibVersion

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
use the test program in bug 4953050 on amd64 on linux jdk-1.5.0_06,07,?08, 09 for same failure.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
Without -lz, the example works fine:
LD_LIBRARY_PATH=/opt/java/jdk1.5.0_09/jre/lib/amd64/server:/opt/java/jdk1.5.0_09/jre/lib/amd64 ./works
Hello World

ACTUAL -
With -lz, we cannot find classes inside jar files:
LD_LIBRARY_PATH=/opt/java/jdk1.5.0_09/jre/lib/amd64/server:/opt/java/jdk1.5.0_09/jre/lib/amd64 ./busted
Cannot find Hello class..


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
see bug 4953050.
Used unmodified except to point to current jvm.
---------- END SOURCE ----------