Name: vsR10008 Date: 08/07/2000



System.loadLibrary fails to load native library when loadLibrary is invoked
from class loaded by bootstrap classloader. Let's consider the following example:

--------------------------------------------------------------------- t.java --
public class t {
    static {
        System.out.println("Class Loader:"+(t.class.getClassLoader()==null?"BOOTSTRAP":"APPLICATION"));
        System.out.println("java.library.path=\""+System.getProperty("java.library.path")+"\"");
        System.loadLibrary("t");
    }
    public static void main(String[] argv) {
          n();
    }
    static native void n();
}
--------------------------------------------------------------------- t.c --
#include <jni.h>
#include <stdio.h>

JNIEXPORT void JNICALL Java_t_n
  (JNIEnv *env, jclass cls) {
  printf("Hello,world!\n");
  }
----------------------------------------------------------------------------

This test should print out:
1) which classloader is used to load this class;
2) property "java.library.path" that contains library search path
3) message from native method n()

To make JVM load class t with bootstrap classloader instead of application
classloader we use the option -Xbootclasspath/p: or -Xbootclasspath/a:

Execution script:

> uname -a

SunOS novo12 5.7 Generic_Patch sun4u sparc SUNW,Ultra-2

> mkdir lib

> setenv LD_LIBRARY_PATH lib

> mkdir classes

> cc -G -KPIC -o lib/libt.so -I${JDK}/include -I${JDK}/include/solaris t.c

> javac -d classes t.java

> java -version

java version "1.4.0beta"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0beta-b26)
Java HotSpot(TM) Core VM (build 1.3-internal, interpreted mode)

> java -classpath classes t

Class Loader:APPLICATION
java.library.path="/export/ld25/java/dest/jdk1.4.0beta-b26/solaris/bin/../jre/lib/sparc:/export/ld25/java/dest/jdk1.4.0beta-b26/sola
ris/bin/../jre/lib/sparc/hotspot:/export/ld25/java/dest/jdk1.4.0beta-b26/solaris/bin/../jre/lib/sparc/5.7:/export/ld25/java/dest/jdk
1.4.0beta-b26/solaris/bin/../jre/../lib/sparc:lib:/usr/lib"
Hello,world!

> java -Xbootclasspath/a:classes t

Class Loader:BOOTSTRAP
java.library.path="/export/ld25/java/dest/jdk1.4.0beta-b26/solaris/bin/../jre/lib/sparc:/export/ld25/java/dest/jdk1.4.0beta-b26/sola
ris/bin/../jre/lib/sparc/hotspot:/export/ld25/java/dest/jdk1.4.0beta-b26/solaris/bin/../jre/lib/sparc/5.7:/export/ld25/java/dest/jdk
1.4.0beta-b26/solaris/bin/../jre/../lib/sparc:lib:/usr/lib"
Exception in thread "main" java.lang.UnsatisfiedLinkError: no t in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1312)
at java.lang.Runtime.loadLibrary0(Runtime.java:749)
at java.lang.System.loadLibrary(System.java:829)
at t.<clinit>(t.java:4)

> java -classpath classes -Djava.library.path=lib t

Class Loader:APPLICATION
java.library.path="lib"
Hello,world!

> java -Xbootclasspath/p:classes -Djava.library.path=lib t

Class Loader:BOOTSTRAP
java.library.path="lib"
Exception in thread "main" java.lang.UnsatisfiedLinkError: no t in java.library.path
at java.lang.ClassLoader.loadLibrary(ClassLoader.java:1312)
at java.lang.Runtime.loadLibrary0(Runtime.java:749)
at java.lang.System.loadLibrary(System.java:829)
at t.<clinit>(t.java:4)

This bug affects both classic and HotSpot in jdk1.2,jdk1.2.1,jdk1.2.2,jdk1.3,jdk1.4

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