Line number information generated for a try-catch statement is not
sufficient for debugger to show more reasonable single-stepping information.

     1 import java.io.*;
     2
     3 public class HelloWorld {
     4 public static void main(String[] args) {
     5 int i = 10;
     6 System.out.println("Hello World!");
     7 try {
     8 if ((i % 2) == 0) {
     9 System.out.println("i = " + i + " is an even number.");
    10 Integer.parseInt("200");
    11 } else {
    12 System.out.println("i = " + i + " is an odd number.");
    13 Thread.sleep(10);
    14 }
    15 } catch (Exception e) {
    16 System.out.println("Exception caught!");
    17 }
    18
    19 System.out.println("Bye");
    20 }
    21 }
> /usr/local/java/jdk1.3.1/solsparc/bin/java -version
java version "1.3.1-rc1"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.3.1-rc1-b17)
Java HotSpot(TM) Client VM (build 1.3.1rc1-b17, mixed mode)

When I debug this program using jdb, and stop at line 10 and then do a 'step',
it shows line 13, which is really confusing because line 13 is *not* executed at all.

Using javap to show the bytecode and line table information:
> /usr/local/java/jdk1.3.1/solsparc/bin/javap -l -c HelloWorld
Compiled from HelloWorld.java
public class HelloWorld extends java.lang.Object {
    public HelloWorld();
    public static void main(java.lang.String[]);
}

Method HelloWorld()
   0 aload_0
   1 invokespecial #1 <Method java.lang.Object()>
   4 return

Line numbers for method HelloWorld()
   line 3: 0

Local variables for method HelloWorld()
   HelloWorld this pc=0, length=5, slot=0

Method void main(java.lang.String[])
   0 bipush 10
   2 istore_1
   3 getstatic #2 <Field java.io.PrintStream out>
   6 ldc #3 <String "Hello World!">
   8 invokevirtual #4 <Method void println(java.lang.String)>
  11 iload_1
  12 iconst_2
  13 irem
  14 ifne 56
  17 getstatic #2 <Field java.io.PrintStream out>
  20 new #5 <Class java.lang.StringBuffer>
  23 dup
  24 invokespecial #6 <Method java.lang.StringBuffer()>
  27 ldc #7 <String "i = ">
  29 invokevirtual #8 <Method java.lang.StringBuffer append(java.lang.String)>
  32 iload_1
  33 invokevirtual #9 <Method java.lang.StringBuffer append(int)>
  36 ldc #10 <String " is an even number.">
  38 invokevirtual #8 <Method java.lang.StringBuffer append(java.lang.String)>
  41 invokevirtual #11 <Method java.lang.String toString()>
  44 invokevirtual #4 <Method void println(java.lang.String)>
  47 ldc #12 <String "200">
  49 invokestatic #13 <Method int parseInt(java.lang.String)>
  52 pop
  53 goto 92
  56 getstatic #2 <Field java.io.PrintStream out>
  59 new #5 <Class java.lang.StringBuffer>
  62 dup
  63 invokespecial #6 <Method java.lang.StringBuffer()>
  66 ldc #7 <String "i = ">
  68 invokevirtual #8 <Method java.lang.StringBuffer append(java.lang.String)>
  71 iload_1
  72 invokevirtual #9 <Method java.lang.StringBuffer append(int)>
  75 ldc #14 <String " is an odd number.">
  77 invokevirtual #8 <Method java.lang.StringBuffer append(java.lang.String)>
  80 invokevirtual #11 <Method java.lang.String toString()>
  83 invokevirtual #4 <Method void println(java.lang.String)>
  86 ldc2_w #15 <Long 10>
  89 invokestatic #17 <Method void sleep(long)>
  92 goto 104
  95 astore_2
  96 getstatic #2 <Field java.io.PrintStream out>
  99 ldc #19 <String "Exception caught!">
 101 invokevirtual #4 <Method void println(java.lang.String)>
 104 getstatic #2 <Field java.io.PrintStream out>
 107 ldc #20 <String "Bye">
 109 invokevirtual #4 <Method void println(java.lang.String)>
 112 return
Exception table:
   from to target type
    11 92 95 <Class java.lang.Exception>

Line numbers for method void main(java.lang.String[])
   line 5: 0
   line 6: 3
   line 8: 11
   line 9: 17
   line 10: 47
   line 12: 56
   line 13: 86
   line 16: 95
   line 19: 104
   line 20: 112

Local variables for method void main(java.lang.String[])
   java.lang.String[] args pc=0, length=113, slot=0
   int i pc=3, length=109, slot=1
   java.lang.Exception e pc=95, length=9, slot=2

After executing line 10, bci will be at 92 goto 104, which does not
associate with any line number. So jdb chooses to show line 13, which
is the last line that has bci <= 92.

Request to generate additional line table information to indicate
appropriate line associated with a catch statement. E.g. bci 92 of
HelloWorld.main refers to line 15.