Bug ID: JDK-4445172 Linux: Fatal: JVM can not locate libpthread.so!

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Other	Other
1.3.1 rc2Fixed	1.4.0Fixed

Name: boT120536                 Date: 04/13/2001


Fatal: JVM can not locate libpthread.so!
Aborted (core dumped)


I cannot run java programs at all!
I have downloaded JDK 1.3.1 for Linux (Redhat 7.0 with updates, eg
kernel-2.2.17-14, glibc-2.2-12) and changed the PATH as shown below. Running
most of the demo applets in Netscape work. However the JFC apps fail, as shown
in the commands and responses below.

Why can libpthread not be found by java or by find?
Thanks in advance. Sorry if its obvious. I have d/l'ed adn followed the
installation instructions in the doco.


$ cd /usr/java/jdk1.3.1/demo/jfc/Notepad
$ ll
total 52
-rw-r--r--    1 root     bin         39908 Apr  2 06:37 Notepad.jar
-r--r--r--    1 root     bin            58 Apr  2 06:37 README.txt
drwxr-xr-x    2 root     bin          4096 Apr 13 10:59 resources
drwxr-xr-x    2 root     bin          4096 Apr 13 10:59 src
$ java -jar Notepad.jar
Fatal: JVM can not locate libpthread.so!
Aborted
$ cd /usr/java
$ find . -name libpthread.so -print
$ echo $PATH
/usr/java/jdk1.3.1/bin:/usr/bin:/bin:/usr/X11R6/bin:/usr/local/bin:/opt/bin:/usr/X11R6/bin

Notes:
java -version gives the same output

I DO have a file
/lib/libpthread-0.9.so

Link
/lib/libpthread.so.0
points to the aboove file

(Review ID: 120725)
======================================================================

CONVERTED DATA BugTraq+ Release Management Values COMMIT TO FIX: ladybird-rc2 FIXED IN: ladybird-rc2 merlin-beta merlin-beta2 INTEGRATED IN: ladybird-rc2 merlin-beta merlin-beta2
14-06-2004
SUGGESTED FIX Instead of dlopen("libpthread.so", RTLD_LAZY), use 'dlopen(NULL, RTLD_LAZY)' hui.huang@Eng 2001-04-16
16-04-2001
WORK AROUND 1. find where the real pthread library is, e.g. /lib/libpthread-0.9.so, 2. su root, 3. cd /usr/lib 4. ln -s /lib/libpthread-0.9.so libpthread.so replace "/lib/libpthread-0.9.so" in the above command with the real path you found in step 1. hui.huang@Eng 2001-04-13
13-04-2001
EVALUATION This is the unfortunate result of fix for 4415774. In order to let Java run on floating stack Linux, we have to use a new function (pthread_getattr_np) included in glibc-2.2.3. But the function is not present in libpthread before that glibc version. So we are forced to dlopen("libpthread.so") and dlsym("pthread_getattr_np"). /usr/lib/libpthread.so is normally a symbolic link to the real libpthread library. If the symbolic link is not created during Linux installation, Java will fail with this error message. User can get around the problem using the method suggested in the workaround section. But we will be looking for a better way to dlopen() pthread library. hui.huang@Eng 2001-04-13 ------------------------------------ use "dlopen(NULL, RTLD_LAZY)" to fix the bug. hui.huang@Eng 2001-04-20
13-04-2001

Duplicate :	JDK-4447270 - Linux: Java 1.3.1 RC1 hang on Redhat 7.1 FCS
Relates :	JDK-4441425 - segmentation fault of jdk 1.3.1-RC1 on linux (SuSE 7.1)
Relates :	JDK-4415774 - Linux: Java 1.3 does not run on Redhat 7.1