Name: mgC56079 Date: 02/10/98



The java.sql.DriverManager.setLogStream(null) doesn't work as specified.
According to the javadoc comment it should turn the logstream off.
It fails to do so correctly. This may result in a NullPointerException
in DriverManager.println(String) method.

Here is a simple test demonstrating the bug:
======= DriverManager2.java =======
import java.sql.DriverManager;

public class DriverManager2 {

public static void main(String args[]) {
  DriverManager.setLogStream(null); // turn logstream off
  for (int i=0; i<10000; i++) // this is a workaround for bug 4110926
                              // (make sure the internal buffer
                              // in PrintWriter is flushed).
    DriverManager.println("message");
}

}
======= Here is the output under jdk1.1.x (correct) =======
% java DriverManager2
======= Here is the output under jdk1.2beta3F (wrong) =======
% java DriverManager2
java.lang.NullPointerException
at java.io.OutputStreamWriter.write(OutputStreamWriter.java:144)
at java.io.BufferedWriter.flushBuffer(BufferedWriter.java:123)
at java.io.BufferedWriter.write(BufferedWriter.java:203)
at java.io.Writer.write(Writer.java:117)
at java.io.PrintWriter.newLine(PrintWriter.java:239)
at java.io.PrintWriter.println(PrintWriter.java:373)
at java.sql.DriverManager.println(DriverManager.java:376)
at DriverManager2.main(DriverManager2.java:8)
=======

The bug is one of the causes for JCK test failure:
api/java_sql/DriverManager/manual.html#DriverManager

======================================================================