After invoking a JNI method that uses outputs to the C++ cerr, the compiler errors appears in using - #include <iostream> in Hello.cc file.

"Hello.cc", line 2: Error: Could not open include file <iostream>.
"Hello.cc", line 7: Error: Could not open include file "Hello.h".
"Hello.cc", line 11: Error: cerr is not defined.
"Hello.cc", line 11: Error: endl is not defined.
4 Error(s) detected.


Here's a sample Java program demonstrating the problem:

    public class Hello {

public native void doIt();

static public void main( String [] args ) {
System.loadLibrary( "Hello" );
Hello h = new Hello();
h.doIt();
System.out.println( "Did it" );
}
    }

And the native code:

    #include <iostream>
    using namespace std;

    #include <jni.h>

    #include "Hello.h"

    JNIEXPORT void JNICALL Java_Hello_doIt( JNIEnv *jenv, jobject jpeer )
    {
cerr << "Hello JNI!" << endl;
    }

It is compiled with:

    % javac Hello.java
    % javah -jni Hello
    % C -mt -G -o libHello.so -I/usr/j2se/include -I/usr/j2se/include/solaris
Hello.cc -library=iostream,no%Cstd


and run with:

   % setenv CLASSPATH .:$CLASSPATH
   %java Hello


The C++ compilers used to test are:

    CC: Sun WorkShop 6 2000/08/30 C++ 5.1 Patch 109490-01
    CC: Sun WorkShop 6 update 1 C++ 5.2 2000/09/11
  
and both exhibit the problem.

workaround: #include <iostream.h>