Date: Thu, 6 Jun 2002 21:20:59 -0700 From: Alan Batie <alan@batie.org> To: freebsd-java@freebsd.org Subject: jni symbol resolution problem Message-ID: <20020606212059.D87904@agora.rdrop.com>
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I'm puzzled, as this was working at one point and I can't see any reason
for it to stop --- I'm hoping someone here will have some insight...
Thanks!
I have a simple JNI function to check for the existence of a specified
login, but java's stopped being able to load it:
Version info:
<agora.rdrop.com> [168] $ java -version
java_X version "1.1.8"
<agora.rdrop.com> [169] $ uname -a
FreeBSD agora.rdrop.com 4.5-STABLE FreeBSD 4.5-STABLE #0: Wed Apr 3 08:52:15 PST 2002 root@agora.rdrop.com:/usr/src/freebsd/src/sys/compile/AGORA i386
A simple java test wrapper:
class atest1 {
// Check to see if unix login already exists
private native boolean jlogin_exists(String login);
// Static initializer to load the C library
static {
System.loadLibrary("apply");
}
static public void main(String s[]) {
if ((new atest1()).jlogin_exists("root")) {
System.out.println("good: root exists");
} else {
System.out.println("bad: root doesn't exist");
}
if ((new atest1()).jlogin_exists("beezlebub")) {
System.out.println("bad: beezlebug exists");
} else {
System.out.println("good: beezlebug doesn't exist");
}
}
}
What happens when I run it:
<agora.rdrop.com> [174] $ java atest1
java.lang.UnsatisfiedLinkError: jlogin_exists
at atest1.main(atest1.java:12)
Ktrace output showing that the symbol is in fact *in* libapply, i.e. it's
finding the library and it seems to be built right:
88958 java_X CALL open(0x2811d100,0,0xbfbfef44)
88958 java_X NAMI "/usr/local/lib/libapply.so"
88958 java_X RET open 5
88958 java_X CALL fstat(0x5,0xbfbfef14)
88958 java_X RET fstat 0
88958 java_X CALL read(0x5,0xbfbfdee4,0x1000)
88958 java_X GIO fd 5 read 4096 bytes
"\^?ELF\^A\^A\^A \0\0\0\0\0\0\0\0\^C\0\^C\0\^A\0\0\0\^P\^F\0\0004\0\0\0\
...
\0 \0\0_DYNAMIC\0_GLOBAL_OFFSET_TABLE_\0_init\0_fini\0__deregiste\
r_frame_info\0__register_frame_info\0Java_apply_jcrypt\0time\0srandom\
\0crypt_set_format\0random\0crypt\0Java_apply_jlogin_1exists\0getpwnam\
\0libcrypt.so.2\0_edata\0__bss_start\0_end\0\M-@\^X\0\0\b\0\0\0\b\^Y\0\
\0\^F\^[\0\0\f\^Y\0\0\^F%\0\0\M-h\^X\0\0\a\^V\0\0\M-l\^X\0\0\a\^Z\0\0\
The JNI C code:
#include <jni.h>
#include <stdio.h>
#include <unistd.h>
#include "apply.h"
JNIEXPORT jboolean JNICALL
Java_apply_jlogin_1exists(JNIEnv *env, jobject this, jstring login)
{
const jbyte *clogin;
// Convert java Unicode string to UTF-8 (ascii)
clogin = (*env)->GetStringUTFChars(env, login, NULL);
if (clogin == NULL) {
// Probably OutOfMemoryError exception;
// if so, it has already been thrown
return NULL;
}
return(getpwnam(clogin) != NULL);
}
And I tried it on a system with the latest versions of things:
<pyrex.batie.org> [113] $ java atest1
Exception in thread "main" java.lang.UnsatisfiedLinkError: jlogin_exists
at atest1.main(atest1.java:12)
<pyrex.batie.org> [114] $ java -version
java version "1.3.1-p6"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1-p6-root-020528-22:16)
Classic VM (build 1.3.1-p6-root-020528-22:16, green threads, nojit)
<pyrex.batie.org> [115] $ uname -a
FreeBSD pyrex.batie.org 4.6-RC FreeBSD 4.6-RC #3: Mon May 27 14:40:21 PDT 2002 root@pyrex.batie.org:/usr/src/freebsd/src/sys/compile/PYREX i386
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