[Bug classpath/22757] javah complains if native method called from static initializer

[gcc-bugzilla at gcc dot gnu dot org]

If a static initializer calls a native method, then
gnu.classpath.tools.JavahMain emits:
*** Couldn't bind native method Java_Foo_bar ***
*** or Java_Foo_bar__ ***

Here is a small test case:
/* Foo.java
 * Compile with:
 *   jikes-sablevm Foo.java
 *   sablevm -Y -c /usr/share/java/cp-tools.jar:. gnu.classpath.tools.JavahMain
-o Foo.h Foo
 */
public class Foo {
  private static native void bar();
  static { bar(); }
  static void foo(int a) { bar(); }
  void foo() { bar(); }
}

If you comment out the static initializer, then javah gives no message,
otherwise it gives the message above.  Note that static methods and non-static
methods calling native methods are ok, it is only the static initializer that
is causing the problem.

Versions:
 jikes-sablevm  1.1.5-1
 sablevm        1.1.5-1
 classpath-tool 0.0.20020812-1
 linux          2.6.3-1-686


------- Comment #1 from from-classpath at savannah dot gnu dot org  2004-08-03 
02:16 -------
I was unable to produce this problem with javah, but did see it with javap. 
The error, if you had a stacktrace, is because gnu.bytecode is doing a
Class.forName() call and this will result in the static initializer being
called which requires the native method to exist in some library somewhere and
be part of your environment.  I would like to see if there is some way to fix
this such that it is not necessary to initialize a Class instance.


------- Comment #2 from from-classpath at savannah dot gnu dot org  2004-08-12 
04:04 -------
The version of gnu.bytecode in use has been updated that resolves this problem
by using a version of Class.forName that does not require Class initialization.


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http://gcc.gnu.org/bugzilla/show_bug.cgi?id=22757