Name: dbT83986 Date: 02/17/99


NB There is no error when jdk-1.2beta4 is used.

1
bash$ javac Samma.java

2
import java.io.*;

// This code was written to show scoping in java for my students.
// In swedish samma means "the same" which is what it is not.

/* samma */
class Samma {
  public static void main (String[] args) {
    samma samma;

    samma = new samma();
    System.out.println("samma " + samma);
  }
}

class samma {
  samma samma;

  { //
    samma samma; // The bug appeared when I added this
  } //

  public samma() {
    samma samma = this.samma;
  }

  public samma(samma samma) {
    this.samma = samma;
  }
}


3
java.lang.NullPointerException
        at sun.tools.tree.DeclarationStatement.inline(DeclarationStatement.java)
        at sun.tools.tree.CompoundStatement.inline(CompoundStatement.java)
        at sun.tools.tree.InlineMethodExpression.inline(InlineMethodExpression.java)
        at sun.tools.tree.CommaExpression.inline(CommaExpression.java)
        at sun.tools.tree.MethodExpression.inline(MethodExpression.java)
        at sun.tools.tree.ExpressionStatement.inline(ExpressionStatement.java)
        at sun.tools.tree.CompoundStatement.inline(CompoundStatement.java)
        at sun.tools.javac.SourceField.inline(SourceField.java)
        at sun.tools.javac.SourceField.code(SourceField.java)
        at sun.tools.javac.SourceClass.compileClass(SourceClass.java)
        at sun.tools.javac.SourceClass.compile(SourceClass.java)
        at sun.tools.javac.Main.compile(Main.java)
        at sun.tools.javac.Main.main(Main.java)
error: An exception has occurred in the compiler; please file a bug report (http://java.sun.com/cgi-bin/bugreport.cgi).
1 error

5
OS Version is 5.6
Kernel Version is SunOS Release 5.6 Version Generic_105181-07 [UNIX(R) System V Release 4.0]
(Review ID: 53687)
======================================================================

Name: skT88420 Date: 06/18/99


// compile this code using "javac Program2.java"
class Point2D {
  public Point2D() {
    x=0;
    y=0;
  }
  private double x,y; {
    double x;
    double y;
    double s;
    double length;
  }
  public Point2D(double xIn, double yIn) {
    x = xIn;
    y = yIn;
  }
  
  public void Scale(double scaleFactor) {
    x = scaleFactor * x;
    y = scaleFactor * y;
  }
  
  public double length() {
    return (Math.sqrt((x * x) + (y * y)));
  }
}

class Program2{
  private double x,y; {
    double x;
    double y;
    double s;
  }
  public void main (String[] args){
    System.out.println("Enter x: ");
    x = Keyboard.readDouble();
    System.out.print("Enter y: ");
    y = Keyboard.readDouble();
    System.out.print("Enter s: ");
    s = Keyboard.readDouble();
    System.out.print("(");
    System.out.print(x);
    System.out.print(",");
    System.out.print(y);
    System.out.print(")");
  }
  
  public void Print () {
    System.out.print("Length is" + length);
    0 = yes;
    1 = no;
    System.out.print("Do Another? (0 = Yes, 1 = No): ");
  }
}
(Review ID: 39896)
======================================================================

Name: skT88420 Date: 07/08/99


When compiling a source file using javac -O I get the following:
------------------------------------------------------------
java.lang.NullPointerException:
        at sun.tools.tree.FieldExpression.costInline(FieldExpression.java:851)
        at sun.tools.tree.NaryExpression.costInline(NaryExpression.java:63)
        at sun.tools.tree.ReturnStatement.costInline(ReturnStatement.java:119)
        at sun.tools.tree.MethodExpression.inlineValue(MethodExpression.java:518)
        at sun.tools.tree.VarDeclarationStatement.inline(VarDeclarationStatement.java:139)
        at sun.tools.tree.DeclarationStatement.inline(DeclarationStatement.java:71)
        at sun.tools.tree.CompoundStatement.inline(CompoundStatement.java:87)
        at sun.tools.javac.SourceField.inline(SourceField.java:518)
        at sun.tools.javac.SourceField.code(SourceField.java:600)
        at sun.tools.javac.SourceClass.compileClass(SourceClass.java:1463)
        at sun.tools.javac.SourceClass.compile(SourceClass.java:1414)
        at sun.tools.javac.Main.compile(Main.java:331)
        at sun.tools.javac.Main.main(Main.java:473)
error: An exception has occurred in the compiler; please file a bug report (http://java.sun.com/cgi-bin/bugreport.cgi).
(Review ID: 85375)
======================================================================