Debugger skips multiple lines/ continues execution at the same time. This bug affects j2sdk1.4.0, j2sdk1.4.0_01, j2sdk1.4.0_02. The latest JDKs (j2sdk1.4.1-build21, j2sdk1.4.2-build02) don't contain this bug. Here is a test case:
- start jdb ($JAVA_HOME/bin/jdb)
- put a breakpoint to the line 8 (stop at Test:8)
- run a java test file (run Test)
- step to the next line (next)
- step to the next line again; line 10 is expected (next)
! The line 10 is expected, but the debugger continues until a breakpoint is hit !


public class Test {
    public static void main( String args[] ) throws Exception {
        test1();
    }

    public static void test1() {
        for( int i = 0; i < 10; i++ ) {
            System.out.println( "aaa" );
            test2();
            System.out.println( "ddd" );
        }
    }

    public static void test2() {
        try {
            System.out.println( "bbb" );
            throw new Exception( "test" );
        } catch( Exception e ) {
            System.out.println( "ccc" );
        }
    }
}