This is just a part of bug 4149136. Separating them in order for easy track.
There is minor memory leaks in awt/2D when running HotJava applet test.
See the following dbx showmemuse report:

(dbx) showmemuse
Checking for memory use...
dbx: warning: rtc: locks in use, could not acquire rtc locks at this time

Blocks in use report (blocks in use: 15807 total size: 3754490 bytes)

 Total % of Num of Avg Allocation call stack
 Size All Blocks Size
======= ==== ====== ====== =======================================
3547800 94% 438 8100 HAE_Allocate < XNewPtr
  51140 1% 2557 20 dga_winlist_add < XDgaGrabDrawable
  30684 <1% 2557 12 dgai_win_grab_common < XDgaGrabDrawable
  30684 <1% 2557 12 dgai_win_grab_common < XDgaGrabDrawable
  30684 <1% 2557 12 dgai_win_grab_common < XDgaGrabDrawable
  30684 <1% 2557 12 dgai_win_grab_common < XDgaGrabDrawable
  30684 <1% 2557 12 dgai_win_grab_common < XDgaGrabDrawable
    876 <1% 3 292 operator new < fontObject::getStrike
    428 <1% 1 428 dgai_win_grab_common < XDgaGrabDrawable < Solaris_DG
A_GetLock < DGA_DeferredLockViewResources < X11DeferredLockViewResources < Java_
sun_awt_motif_X11Graphics_X11LockViewResources < sysInvokeNative < invokeJNINati
veMethod
    224 <1% 2 112 XCreateGC < awt_init_gc
    128 <1% 2 64 operator new < hsSoftNew
     96 <1% 1 96 awt_copyXEvent < awt_canvas_handleEvent < dispatchTo
Widget < awt_MToolkit_loop < Java_sun_awt_motif_MToolkit_run < invoke_V_V < invo
keLazyNativeMethod < callmethod_1
     72 <1% 2 36 calloc < Java_sun_awt_motif_X11Graphics_createFromCo
mponent
     60 <1% 2 30 XtMalloc < _XtCreateXlations
     48 <1% 3 16 operator new < fontObject::getStrike
     40 <1% 1 40 dgai_win_grab_common < XDgaGrabDrawable < Solaris_DG
A_GetLock < DGA_DeferredLockViewResources < X11DeferredLockViewResources < Java_
sun_awt_motif_X11Graphics_X11LockViewResources < sysInvokeNative < invokeJNINati
veMethod
     36 <1% 3 12 operator new < fontObject::getStrike
     32 <1% 1 32 miUnionNonO < miRegionOp < XUnionRegion < XUnionRect
WithRegion < XtAddExposureToRegion < CompressExposures < XtDispatchEventToWidget
 < _XtDefaultDispatcher
     24 <1% 1 24 calloc < Java_sun_awt_motif_X11Graphics_X11LockViewR
esources < sysInvokeNative < invokeJNINativeMethod < callmethod_1 < do_execute_j
ava_method_vararg < execute_java_dynamic_method < saveStackBase
     20 <1% 1 20 calloc < XtCalloc < MakeBindData < ComposeTranslatio
ns < XtOverrideTranslations < SetValues < CallSetValues < CallSetValues

When stop at the dgai_win_grab_common, we can the see the following stack trace.
(Note: this is only one call site, there are several other call site).

(dbx) stop in dgai_win_grab_common
dbx: warning: 'dgai_win_grab_common' has no debugger info -- will trigger on fir
st instruction
(3) stop in dgai_win_grab_common
(dbx) cont
t@8 (l@8) stopped in dgai_win_grab_common at 0xc9d06f60
0xc9d06f60: dgai_win_grab_common : save %sp, -0x90, %sp
(dbx) where
current thread: t@8
=>[1] dgai_win_grab_common(0x126b60, 0xffffffff, 0x27bd, 0x1, 0xeed5a618, 0x38),
 at 0xc9d06f60
  [2] XDgaGrabDrawable(0x126b60, 0x50018e6, 0xc9d21310, 0x27bd, 0x0, 0xff), at 0
xc9d069cc
  [3] Solaris_DGA_GetLock(0x1b86c0, 0x289798, 0x50018e6, 0xdea0387c, 0x1, 0x1),
at 0xcb100da0
  [4] DGA_DeferredLockViewResources(0x1, 0xd7238814, 0x1, 0x1b86c0, 0x1, 0x1), a
t 0xd7163fa0
  [5] X11DeferredLockViewResources(0x1b86c0, 0x1bed3c, 0x1b86c0, 0x881ba0, 0xeb1
5818c, 0x1b86c0), at 0xd716457c
  [6] Java_sun_awt_motif_X11Graphics_X11LockViewResources(0xd722b400, 0xd72387d8
, 0xd7238c00, 0x1b86c0, 0x1, 0x1), at 0xd7164988
  [7] sysInvokeNative(0x1b86c0, 0xd7164600, 0x1bed38, 0x302a2, 0x2, 0x0), at 0xe
b19a558
  [8] invokeJNINativeMethod(0x1bed40, 0x299288, 0x1bed38, 0x1b86c0, 0x0, 0x1bed1
0), at 0xeb1428fc
  [9] callmethod_1(0x29b33d, 0x1b86c0, 0x1bed38, 0x1bed04, 0x2987d0, 0x1bed10),
at 0xeb19ae08
  [10] do_execute_java_method_vararg(0x5aea8, 0x0, 0x0, 0x0, 0x1be800, 0xeb1b50b
d), at 0xeb14fee0
  [11] execute_java_dynamic_method(0x1b86c0, 0xdb0ba018, 0xeb1b50b8, 0xeb1b50bc,
 0xeed5a618, 0x18), at 0xeb14f778
  [12] saveStackBase(0xeb1ba800, 0xdb0ba018, 0xdb0ba018, 0xeb1b8c00, 0xeb1ba800,
 0xeb16fb24), at 0xeb1809a4
  [13] _start(0x0, 0xecf83d80, 0x0, 0xed92de90, 0x1, 0xfe401000), at 0xec5091bc
(dbx)