FULL PRODUCT VERSION :
java version "1.7.0_45"
Java(TM) SE Runtime Environment (build 1.7.0_45-b18)
Java HotSpot(TM) 64-Bit Server VM (build 24.45-b08, mixed mode)

ADDITIONAL OS VERSION INFORMATION :
OSX 10.9.1

A DESCRIPTION OF THE PROBLEM :
When I input any character to JPasswordField with Japanese IME KOTOERI on, JVM always show error.
With KOTOERI off, no error found.

REGRESSION. Last worked in version 7u45

ADDITIONAL REGRESSION INFORMATION:
I am sorry. About regression info, I don't know.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Run sample code. Input any character with KOTOERI on.

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No error.
ACTUAL -
An unexpected error occurred.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
2013-12-19 19:48:39.017 java[495:507] An uncaught exception was raised
2013-12-19 19:48:39.019 java[495:507] java.lang.NullPointerException
2013-12-19 19:48:39.033 java[495:507] (
0 CoreFoundation 0x00007fff912c541c __exceptionPreprocess + 172
1 libobjc.A.dylib 0x00007fff8d791e75 objc_exception_throw + 43
2 CoreFoundation 0x00007fff912c4fc9 -[NSException raise] + 9
3 JavaNativeFoundation 0x0000000112e2c4c1 JNFCallObjectMethod + 230
4 liblwawt.dylib 0x00000001139aa913 -[AWTView attributedSubstringForProposedRange:actualRange:] + 78
5 AppKit 0x00007fff8a26781d -[NSTextInputContext handleTSMEvent:] + 3476
6 AppKit 0x00007fff8a266a65 _NSTSMEventHandler + 205
7 HIToolbox 0x00007fff91ee66d4 _ZL23DispatchEventToHandlersP14EventTargetRecP14OpaqueEventRefP14HandlerCallRec + 892
8 HIToolbox 0x00007fff91ee5c87 _ZL30SendEventToEventTargetInternalP14OpaqueEventRefP20OpaqueEventTargetRefP14HandlerCallRec + 385
9 HIToolbox 0x00007fff91ef9d90 SendEventToEventTarget + 40
10 HIToolbox 0x00007fff91f3b0ed SendTSMEvent + 33
11 HIToolbox 0x00007fff920e871f SendTextInputEvent + 1028
12 HIToolbox 0x00007fff921338ec -[IMKInputSession _copyUniCharsForRange:intoBuffer:ofLength:] + 268
13 HIToolbox 0x00007fff921339bb -[IMKInputSession _coreAttributesFromRange:whichAttributes:actualRange:] + 137
14 HIToolbox 0x00007fff92134aac -[IMKInputSession attributedSubstringFromRange:] + 89
15 CoreFoundation 0x00007fff911b0dec __invoking___ + 140
16 CoreFoundation 0x00007fff911b0c54 -[NSInvocation invoke] + 308
17 CoreFoundation 0x00007fff912537a6 -[NSInvocation invokeWithTarget:] + 54
18 CoreFoundation 0x00007fff91223384 ___forwarding___ + 452
19 CoreFoundation 0x00007fff91223138 _CF_forwarding_prep_0 + 120
20 CoreFoundation 0x00007fff911b0dec __invoking___ + 140
21 CoreFoundation 0x00007fff911b0c54 -[NSInvocation invoke] + 308
22 Foundation 0x00007fff8c215c67 -[NSConnection dispatchInvocation:] + 135
23 Foundation 0x00007fff8c21592d -[NSConnection handleRequest:sequence:] + 1434
24 Foundation 0x00007fff8c1bccf0 -[NSConnection handlePortCoder:] + 652
25 Foundation 0x00007fff8c1bc628 -[NSConnection dispatchWithComponents:] + 50
26 Foundation 0x00007fff8c1a0ed8 __NSFireMachPort + 257
27 CoreFoundation 0x00007fff911f6d04 __CFMachPortPerform + 388
28 CoreFoundation 0x00007fff911f6b69 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE1_PERFORM_FUNCTION__ + 41
29 CoreFoundation 0x00007fff911f6ade __CFRunLoopDoSource1 + 478
30 CoreFoundation 0x00007fff911e7bd6 __CFRunLoopRun + 1830
31 CoreFoundation 0x00007fff911e7275 CFRunLoopRunSpecific + 309
32 Foundation 0x00007fff8c1b900e -[NSConnection sendInvocation:internal:] + 1965
33 CoreFoundation 0x00007fff91223384 ___forwarding___ + 452
34 CoreFoundation 0x00007fff91223138 _CF_forwarding_prep_0 + 120
35 HIToolbox 0x00007fff9212fb8d -[IMKInputSession handleEvent:] + 946
36 HIToolbox 0x00007fff920f32e8 IMKInputSessionProcessEventRef + 45
37 HIToolbox 0x00007fff920f28aa InputMethodInstanceProcessEventRef + 100
38 HIToolbox 0x00007fff920e7e6f TSMEventToInputMethod + 131
39 HIToolbox 0x00007fff91f3a87c TSMKeyEvent + 283
40 HIToolbox 0x00007fff91f27678 TSMProcessRawKeyEvent + 3584
41 AppKit 0x00007fff8a2662b0 -[NSTextInputContext handleEvent:] + 731
42 AppKit 0x00007fff8a245b5d -[NSView interpretKeyEvents:] + 180
43 liblwawt.dylib 0x00000001139a9880 -[AWTView keyDown:] + 85
44 AppKit 0x00007fff8a21281b -[NSWindow sendEvent:] + 1843
45 liblwawt.dylib 0x00000001139ad2f5 -[AWTWindow_Normal sendEvent:] + 86
46 AppKit 0x00007fff8a1b3ca2 -[NSApplication sendEvent:] + 3395
47 libosxapp.dylib 0x0000000113a4566f -[NSApplicationAWT sendEvent:] + 179
48 AppKit 0x00007fff8a003a29 -[NSApplication run] + 646
49 libosxapp.dylib 0x0000000113a45557 +[NSApplicationAWT runAWTLoopWithApp:] + 156
50 liblwawt.dylib 0x000000011399dba9 -[AWTStarter starter:] + 873
51 Foundation 0x00007fff8c19a0de __NSThreadPerformPerform + 229
52 CoreFoundation 0x00007fff911f68f1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
53 CoreFoundation 0x00007fff911e8062 __CFRunLoopDoSources0 + 242
54 CoreFoundation 0x00007fff911e77ef __CFRunLoopRun + 831
55 CoreFoundation 0x00007fff911e7275 CFRunLoopRunSpecific + 309
56 java 0x0000000105b143b0 CreateExecutionEnvironment + 871
57 java 0x0000000105b0eb5c JLI_Launch + 1952
58 java 0x0000000105b1470d main + 101
59 java 0x0000000105b0e3b4 start + 52
60 ??? 0x0000000000000007 0x0 + 7
)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package test;

import java.awt.BorderLayout;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JPasswordField;

public class Test {

    public static void main(String[] args) {
        new Test().start();
    }
    
    public void start() {
        
        JFrame frame = new JFrame();
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        JPanel panel = new JPanel();
        panel.setLayout(new BorderLayout());
        
        JPasswordField fld = new JPasswordField(10);
        panel.add(fld);
        
        frame.setContentPane(panel);
        frame.pack();
        frame.setVisible(true);
    }
    
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
I don't know.