I’ve never seen this, maybe it is a bug in the jvm?
I added some code to solve sudokus:
private boolean solve( int row, int col, Cell[][] cells )
{
if ( row == NUM_PUZZLE_ROWS )
{
row = 0;
col++;
if ( col == NUM_PUZZLE_COLUMNS )
return true;
}
if ( cells[row][col].getValue() != 0 ) // skip filled cells
return solve( row + 1, col, cells );
for (int val = 1; val <= NUM_PUZZLE_ROWS; val++)
{
if ( isPossible( row, col, val, cells ) )
{
cells[row][col].setValue( val );
if ( solve( row + 1, col, cells ) )
return true;
}
}
cells[row][col].setValue( 0 ); // reset on backtrack
return false;
}
private boolean isPossible(
int row, int col, int val, Cell[][] cells )
{
//check the row
for (int r = 0; r < 9; r++) // row
{
//no duplicates permitted
if ( val == cells[r][col].getValue() )
return false;
}
//check the column
for (int c = 0; c < 9; c++) // col
{
//no duplicates permitted
if ( val == cells[row][c].getValue() )
return false;
}
int rowOffset = (row / 3) * 3;
int colOffset = (col / 3) * 3;
//check the 3x3 box
for (int r = 0; r < 3; ++r)
{
for (int c = 0; c < 3; ++c)
{
if ( val == cells[rowOffset + r][colOffset + c].getValue() )
{
return false;
}
}
}
return true; // no violations, so it's possible
}
private boolean solve( Cell[][] cells )
{
resetPuzzle();
return solve( 0, 0, cells );
}
public boolean solve()
{
return solve( cells );
}
I trigger this code with the solve button. The code works great. The puzzle is solved and everything works fine. Until I close the application. This does not happen everytime but: It only ever happens when I have solved a puzzle and of those times only happens half the time.
The application closes fine but it returns 1 rather than 0 success and leaves this log file:
A fatal error has been detected by the Java Runtime Environment:
EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6d93591e, pid=2368, tid=2040
JRE version: 6.0_27-b07
Java VM: Java HotSpot(TM) Client VM (20.2-b06 mixed mode, sharing windows-x86 )
Problematic frame:
V [jvm.dll+0x9591e]If you would like to submit a bug report, please visit:
http://java.sun.com/webapps/bugreport/crash.jsp————— T H R E A D —————
Current thread (0x02be1800): JavaThread “AWT-Windows” daemon
[_thread_in_vm, id=2040, stack(0x02fa0000,0x02ff0000)]siginfo: ExceptionCode=0xc0000005, reading address 0x00000000
Registers: EAX=0x02be20c8, EBX=0x00000000, ECX=0x00000000,
EDX=0x02fef89c ESP=0x02fef88c, EBP=0x02fef920, ESI=0x02be1800,
EDI=0x02bde6d0 EIP=0x6d93591e, EFLAGS=0x00010202Top of Stack: (sp=0x02fef88c) 0x02fef88c: 02b002b8 02be1928 02be1800
000c3550 0x02fef89c: 02be20c8 000c3528 00000000 02fef97c 0x02fef8ac:
7c91084c 000b01a0 7c910981 000b0608 0x02fef8bc: 7c91015d 000c3550
000c3530 02fef89c 0x02fef8cc: 02fef8bd 00000001 00000008 00000000
0x02fef8dc: 7e428d8b 6d14cea1 02fef8f4 00000000 0x02fef8ec:
02fef91c 6d8a2af6 02be1800 02be2df8 0x02fef8fc: 02be1800 02be1928
02fef8f8 02be1c88Instructions: (pc=0x6d93591e) 0x6d9358fe: 78 ff ff ff 89 41 14 8b 45
ac c6 04 10 01 8b 4d 0x6d93590e: b0 8b 55 a8 8b 45 f4 89 04 8a ff 45
b0 8b 5d fc 0x6d93591e: 8b 03 8b 48 08 0f b7 51 2a 8b 40 0c 8b 4c 90
28 0x6d93592e: 51 56 8d 4d bc e8 d8 a5 07 00 8b 55 18 33 c0 89Register to memory mapping:
EAX=0x02be20c8 is an unknown value EBX=0x00000000 is an unknown value
ECX=0x00000000 is an unknown value EDX=0x02fef89c is pointing into the
stack for thread: 0x02be1800 ESP=0x02fef88c is pointing into the stack
for thread: 0x02be1800 EBP=0x02fef920 is pointing into the stack for
thread: 0x02be1800 ESI=0x02be1800 is a thread EDI=0x02bde6d0 is an
unknown valueStack: [0x02fa0000,0x02ff0000], sp=0x02fef88c, free space=318k
Native frames: (J=compiled Java code, j=interpreted, Vv=VM code,
C=native code) V [jvm.dll+0x9591e] V [jvm.dll+0x9884c] C
[awt.dll+0x6cbbc] Java_sun_awt_windows_WChoicePeer_create+0x10c C
[USER32.dll+0x8734] GetDC+0x6d C [USER32.dll+0x8816] GetDC+0x14f C
[USER32.dll+0x18ea0] DefWindowProcW+0x180 C [USER32.dll+0x18eec]
DefWindowProcW+0x1cc C [ntdll.dll+0xe473]
KiUserCallbackDispatcher+0x13Java frames: (J=compiled Java code, j=interpreted, Vv=VM code) j
sun.awt.windows.WToolkit.eventLoop()V+0 j
sun.awt.windows.WToolkit.run()V+52 j java.lang.Thread.run()V+11 v
~StubRoutines::call_stub————— P R O C E S S —————
Java Threads: ( => current thread ) 0x02ba1400 JavaThread “Thread-1”
daemon [_thread_in_native, id=924, stack(0x03230000,0x03280000)]
0x002b6c00 JavaThread “DestroyJavaVM” [_thread_blocked, id=3688,
stack(0x008c0000,0x00910000)] 0x03136c00 JavaThread
“AWT-EventQueue-0” [_thread_blocked, id=376,
stack(0x03280000,0x032d0000)]
=>0x02be1800 JavaThread “AWT-Windows” daemon [_thread_in_vm, id=2040, stack(0x02fa0000,0x02ff0000)] 0x02be0800 JavaThread “AWT-Shutdown”
[_thread_blocked, id=1924, stack(0x02f50000,0x02fa0000)] 0x02bdec00
JavaThread “Java2D Disposer” daemon [_thread_in_native, id=3992,
stack(0x02f00000,0x02f50000)] 0x02b57c00 JavaThread “Low Memory
Detector” daemon [_thread_blocked, id=3804,
stack(0x02dd0000,0x02e20000)] 0x02b52000 JavaThread “C1
CompilerThread0” daemon [_thread_blocked, id=612,
stack(0x02d80000,0x02dd0000)] 0x02b50400 JavaThread “Attach
Listener” daemon [_thread_blocked, id=3916,
stack(0x02d30000,0x02d80000)] 0x02b4f000 JavaThread “Signal
Dispatcher” daemon [_thread_blocked, id=3844,
stack(0x02ce0000,0x02d30000)] 0x02b48400 JavaThread “Finalizer”
daemon [_thread_blocked, id=4092, stack(0x02c90000,0x02ce0000)]
0x02b46c00 JavaThread “Reference Handler” daemon [_thread_blocked,
id=2828, stack(0x02c40000,0x02c90000)]Other Threads: 0x02b0ac00 VMThread [stack: 0x02bf0000,0x02c40000]
[id=3612] 0x02b63000 WatcherThread [stack: 0x02e20000,0x02e70000]
[id=1944]VM state:not at safepoint (normal execution)
VM Mutex/Monitor currently owned by a thread: None
Heap def new generation total 4928K, used 823K [0x22990000,
0x22ee0000, 0x27ee0000) eden space 4416K, 7% used [0x22990000,
0x229ddc50, 0x22de0000) from space 512K, 100% used [0x22e60000,
0x22ee0000, 0x22ee0000) to space 512K, 0% used [0x22de0000,
0x22de0000, 0x22e60000) tenured generation total 10944K, used 1261K
[0x27ee0000, 0x28990000, 0x32990000) the space 10944K, 11% used
[0x27ee0000, 0x2801b590, 0x2801b600, 0x28990000) compacting perm gen
total 12288K, used 244K [0x32990000, 0x33590000, 0x36990000) the
space 12288K, 1% used [0x32990000, 0x329cd110, 0x329cd200,
0x33590000)
ro space 10240K, 54% used [0x36990000, 0x36f0f548, 0x36f0f600, 0x37390000)
rw space 12288K, 55% used [0x37390000, 0x37a35140, 0x37a35200, 0x37f90000)Code Cache [0x00910000, 0x009e0000, 0x02910000) total_blobs=410
nmethods=214 adapters=132 free_code_cache=32713344
largest_free_block=0Dynamic libraries: 0x00400000 – 0x00424000 C:\Program
Files\Java\jdk1.6.0_27\bin\java.exe 0x7c900000 – 0x7c9b2000
C:\WINDOWS\system32\ntdll.dll 0x7c800000 – 0x7c8f6000
C:\WINDOWS\system32\kernel32.dll 0x77dd0000 – 0x77e6b000
C:\WINDOWS\system32\ADVAPI32.dll 0x77e70000 – 0x77f03000
C:\WINDOWS\system32\RPCRT4.dll 0x77fe0000 – 0x77ff1000
C:\WINDOWS\system32\Secur32.dll 0x7c340000 – 0x7c396000 C:\Program
Files\Java\jdk1.6.0_27\jre\bin\msvcr71.dll 0x6d8a0000 – 0x6db4f000
C:\Program Files\Java\jdk1.6.0_27\jre\bin\client\jvm.dll 0x7e410000 –
0x7e4a1000 C:\WINDOWS\system32\USER32.dll 0x77f10000 – 0x77f59000
C:\WINDOWS\system32\GDI32.dll 0x76b40000 – 0x76b6d000
C:\WINDOWS\system32\WINMM.dll 0x76390000 – 0x763ad000
C:\WINDOWS\system32\IMM32.DLL 0x6d850000 – 0x6d85c000 C:\Program
Files\Java\jdk1.6.0_27\jre\bin\verify.dll 0x6d3d0000 – 0x6d3ef000
C:\Program Files\Java\jdk1.6.0_27\jre\bin\java.dll 0x6d890000 –
0x6d89f000 C:\Program Files\Java\jdk1.6.0_27\jre\bin\zip.dll
0x6d0b0000 – 0x6d1fc000 C:\Program
Files\Java\jdk1.6.0_27\jre\bin\awt.dll 0x73000000 – 0x73026000
C:\WINDOWS\system32\WINSPOOL.DRV 0x77c10000 – 0x77c68000
C:\WINDOWS\system32\msvcrt.dll 0x774e0000 – 0x7761e000
C:\WINDOWS\system32\ole32.dll 0x773d0000 – 0x774d3000
C:\WINDOWS\WinSxS\x86_Microsoft.Windows.Common-Controls_6595b64144ccf1df_6.0.2600.6028_x-ww_61e65202\COMCTL32.dll
0x77f60000 – 0x77fd6000 C:\WINDOWS\system32\SHLWAPI.dll 0x5ad70000 –
0x5ada8000 C:\WINDOWS\system32\uxtheme.dll 0x6d2e0000 – 0x6d32f000
C:\Program Files\Java\jdk1.6.0_27\jre\bin\fontmanager.dll 0x74720000
– 0x7476c000 C:\WINDOWS\system32\MSCTF.dll 0x755c0000 – 0x755ee000 C:\WINDOWS\system32\msctfime.ime 0x7c9c0000 – 0x7d1d7000
C:\WINDOWS\system32\shell32.dll 0x6d6b0000 – 0x6d6c3000 C:\Program
Files\Java\jdk1.6.0_27\jre\bin\net.dll 0x71ab0000 – 0x71ac7000
C:\WINDOWS\system32\WS2_32.dll 0x71aa0000 – 0x71aa8000
C:\WINDOWS\system32\WS2HELP.dll 0x6d6d0000 – 0x6d6d9000 C:\Program
Files\Java\jdk1.6.0_27\jre\bin\nio.dll 0x76bf0000 – 0x76bfb000
C:\WINDOWS\system32\PSAPI.DLLVM Arguments: jvm_args: -Dfile.encoding=UTF-8
-Djava.security.policy=applet.policy java_command: SudokuApp Launcher Type: SUN_STANDARDEnvironment Variables: CLASSPATH=.;C:\Program
Files\Java\jre6\lib\ext\QTJava.zip
PATH=C:\WINDOWS\system32;C:\WINDOWS;C:\WINDOWS\System32\Wbem;C:\windows\system32\WindowsPowerShell\v1.0;C:\windows\system32\WindowsPowerShell\v1.0;C:\Program
Files\Common Files\Roxio Shared\DLLShared\;C:\Program Files\Common
Files\Roxio Shared\OEM\DLLShared\;C:\Program Files\Common Files\Roxio
Shared\OEM\DLLShared\;C:\Program Files\Common Files\Roxio
Shared\OEM\12.0\DLLShared\;C:\Program
Files\Roxio\OEM\AudioCore\;C:\Program Files\Microsoft SQL
Server\100\Tools\Binn\;C:\Program Files\Microsoft SQL
Server\100\DTS\Binn\;C:\Program Files\QuickTime\QTSystem\
USERNAME=0935231 OS=Windows_NT PROCESSOR_IDENTIFIER=x86 Family 6 Model
42 Stepping 7, GenuineIntel————— S Y S T E M —————
OS: Windows XP Build 2600 Service Pack 3
CPU:total 8 (4 cores per cpu, 2 threads per core) family 6 model 42
stepping 7, cmov, cx8, fxsr, mmx, sse, sse2, sse3, ssse3, sse4.1,
sse4.2, popcnt, htMemory: 4k page, physical 3318716k(2487016k free), swap
7866808k(7197684k free)vm_info: Java HotSpot(TM) Client VM (20.2-b06) for windows-x86 JRE
(1.6.0_27-b07), built on Jul 19 2011 01:04:42 by “java_re” with MS
VC++ 7.1 (VS2003)time: Mon Nov 28 12:30:52 2011 elapsed time: 10 seconds
What could be wrong?
The code does not throw any exceptions and there are no signs of anything going wrong.
Thanks
You’ve found a bug in Java unless you have some native code you’re not telling us about.