Re: is it possible to call 32 bit shared libraries on 64bit os platforms?

From:

Nigel Wade <nmw@ion.le.ac.uk>

Newsgroups:

comp.lang.java.programmer

Date:

Thu, 22 Apr 2010 09:37:42 +0000 (UTC)

Message-ID:

<hqp5d6$81g$1@south.jnrs.ja.net>

On Thu, 22 Apr 2010 01:10:39 -0700, junyoung wrote:

I have a 64bit jvm now,

$> file /usr/lib/jvm/java-1.5.0-sun/jre/bin/java
/usr/lib/jvm/java-1.5.0-sun/jre/bin/java: ELF 64-bit LSB executable,
x86-64, version 1 (SYSV), for GNU/Linux 2.4.0, dynamically linked (uses
shared libs), stripped

and, my java applications are using 32bit shared libraries to be run
normally.

$ file libadscli.so
libadscli.so: ELF 32-bit LSB shared object, Intel 80386, version 1
(SYSV), not stripped

but, whenever my applications are failed because of the following
errors.

java.lang.UnsatisfiedLinkError: /home/jykim/work/trunk/ads/ads_home/
lib/libadscli.so: /home/jykim/work/trunk/ads/ads_home/lib/ libadscli.so:
wrong ELF class: ELFCLASS32 (Possible cause: architecture word width
mismatch)
    at java.lang.ClassLoader$NativeLibrary.load(Native Method) at
    java.lang.ClassLoader.loadLibrary0(ClassLoader.java:1753) at
    java.lang.ClassLoader.loadLibrary(ClassLoader.java:1678) at
    java.lang.Runtime.loadLibrary0(Runtime.java:822) at
    java.lang.System.loadLibrary(System.java:993) at
    com.altibase.ads.jdbc.ADSCLI.<init>(ADSCLI.java:33) at
    com.altibase.ads.jdbc.ADSDriver.initialize(ADSDriver.java:117) at
    com.altibase.ads.jdbc.ADSDriver.connect(ADSDriver.java:217) at
    java.sql.DriverManager.getConnection(DriverManager.java:525) at
    java.sql.DriverManager.getConnection(DriverManager.java:193) at
    ads.jdbc.test.common.TestUtil.openConnect(TestUtil.java:99) at
    ads.jdbc.test.common.TestUtil.openConnect(TestUtil.java:88) at
    ads.jdbc.test.ConnectionTest.setUp(ConnectionTest.java:25)

Is there any way to use 32bit shared libraries on 64 bit platforms
without installing proper jvm version ( in case of, 32bit jvm ).

Not that I am aware of.

You will need to install a 32bit JVM and ensure that you run the correct
one (it's perfectly possible to have multiple versions, and
architectures, of the JVM co-exist quite happily on Linux). Normally all
you need to do is run the correct java executable. Download the latest
JRE from Sun/Oracle. Get the non-RPM version which allows you to extract
it anywhere you like. The RPM version will use the package manager to
install it, and will probably replace your existing version.

--
Nigel Wade