Hello all,

I just wanted to check: is the constructor for RestTemplate thread safe? I just fixed a very bad bug in our Android application that happened when two threads tried to create instance of RestTemplate at approximately the same time. The application would crash with a segmentation fault and dump the user back into the desktop, with no "Force Close" message or anything. I just fixed this by surrounding the new RestTemplate(factory) call in a synchronized method. Boom, no crashes . Is this a known issue or could something in my code be causing this??

Thanks!

Here's a sample crash from ICS (it crashes on all versions though):

01-25 17:39:01.285: I/DEBUG(1741): *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
01-25 17:39:01.285: I/DEBUG(1741): Build fingerprint: 'google/soju/crespo:4.0.3/IML74K/239410:user/release-keys'
01-25 17:39:01.285: I/DEBUG(1741): pid: 5263, tid: 5281
01-25 17:39:01.285: I/DEBUG(1741): signal 11 (SIGSEGV), code 1 (SEGV_MAPERR), fault addr 00000014
01-25 17:39:01.285: I/DEBUG(1741): r0 00000000 r1 01753d50 r2 00000021 r3 00000019
01-25 17:39:01.285: I/DEBUG(1741): r4 00000000 r5 405477a4 r6 50df2a58 r7 01753c48
01-25 17:39:01.285: I/DEBUG(1741): r8 50df2bb0 r9 405477a0 10 4c5537f0 fp 50df2c24
01-25 17:39:01.285: I/DEBUG(1741): ip 0000000d sp 50df2a08 lr 404a2eab pc 4049b546 cpsr 00000030
01-25 17:39:01.285: I/DEBUG(1741): d0 00000a2900000a00 d1 00000a3100000a00
01-25 17:39:01.285: I/DEBUG(1741): d2 00000a3700000a11 d3 00000a3a00000a00
01-25 17:39:01.285: I/DEBUG(1741): d4 4bb702784bb70240 d5 4be22cf84bb702b0
01-25 17:39:01.285: I/DEBUG(1741): d6 4be22d684be22d30 d7 4be22dd84be22da0
01-25 17:39:01.285: I/DEBUG(1741): d8 0000000000000000 d9 0000000000000000
01-25 17:39:01.285: I/DEBUG(1741): d10 0000000000000000 d11 0000000000000000
01-25 17:39:01.285: I/DEBUG(1741): d12 0000000000000000 d13 0000000000000000
01-25 17:39:01.285: I/DEBUG(1741): d14 0000000000000000 d15 0000000000000000
01-25 17:39:01.285: I/DEBUG(1741): d16 401195c800000001 d17 ff131313ff131313
01-25 17:39:01.285: I/DEBUG(1741): d18 0707070703030303 d19 ff131313ff131313
01-25 17:39:01.285: I/DEBUG(1741): d20 0100010001000100 d21 0100010001000100
01-25 17:39:01.285: I/DEBUG(1741): d22 ff131313ff131313 d23 ff00130013001300
01-25 17:39:01.285: I/DEBUG(1741): d24 ff00130013001300 d25 ff00130013001300
01-25 17:39:01.285: I/DEBUG(1741): d26 0100010001000100 d27 0100010001000100
01-25 17:39:01.285: I/DEBUG(1741): d28 0100010001000100 d29 0100010001000100
01-25 17:39:01.285: I/DEBUG(1741): d30 0001000000010000 d31 0001000000010000
01-25 17:39:01.285: I/DEBUG(1741): scr 60000012
01-25 17:39:01.484: I/ActivityManager(151): No longer want com.android.providers.calendar (pid 5101): hidden #16
01-25 17:39:01.512: I/DEBUG(1741): #00 pc 0004a546 /system/lib/libicuuc.so (_ZN6icu_4610UnicodeSet7compactEv)
01-25 17:39:01.512: I/DEBUG(1741): #01 pc 00051ea6 /system/lib/libicuuc.so (uset_compact_46)
01-25 17:39:01.512: I/DEBUG(1741): #02 pc 000885ec /system/lib/libicuuc.so
01-25 17:39:01.512: I/DEBUG(1741): #03 pc 0007d644 /system/lib/libicuuc.so
01-25 17:39:01.512: I/DEBUG(1741): #04 pc 0007d84c /system/lib/libicuuc.so
01-25 17:39:01.512: I/DEBUG(1741): #05 pc 00080126 /system/lib/libicuuc.so (ucnv_open_46)
01-25 17:39:01.512: I/DEBUG(1741): #06 pc 00014020 /system/lib/libnativehelper.so
01-25 17:39:01.516: I/DEBUG(1741): #07 pc 0001ebf0 /system/lib/libdvm.so (dvmPlatformInvoke)
01-25 17:39:01.516: I/DEBUG(1741): #08 pc 00058c30 /system/lib/libdvm.so (_Z16dvmCallJNIMethodPKjP6JValuePK6MethodP6Thread)
01-25 17:39:01.516: I/DEBUG(1741): code around pc:
01-25 17:39:01.516: I/DEBUG(1741): 4049b524 ff32f7ff 29009901 af5cf73f f44f68a0 ..2....)?.\..hO.
01-25 17:39:01.516: I/DEBUG(1741): 4049b534 69231188 f8431c42 60a21020 bf00e799 ..#iB.C. ..`....
01-25 17:39:01.516: I/DEBUG(1741): 4049b544 6943b570 b10b4604 bd704620 28006ac0 p.Ci.F.. Fp..j.(
01-25 17:39:01.516: I/DEBUG(1741): 4049b554 f894d1fa f0155030 d1f50501 b11069a0 ....0P.......i..
01-25 17:39:01.516: I/DEBUG(1741): 4049b564 fbb4f021 68a561a5 428d68e1 2d00daec !....a.h.h.B...-
01-25 17:39:01.516: I/DEBUG(1741): code around lr:
01-25 17:39:01.516: I/DEBUG(1741): 404a2e88 bd10fa63 f7f8b510 bd10fc7d f7f8b510 c.......}.......
01-25 17:39:01.516: I/DEBUG(1741): 404a2e98 bd10fd19 f7f8b510 bd10fa2f f7f8b510 ......../.......
01-25 17:39:01.516: I/DEBUG(1741): 404a2ea8 bd10fb4d f7f8b510 bd10fcb1 f7f9b510 M...............
01-25 17:39:01.516: I/DEBUG(1741): 404a2eb8 bd10fb01 f7f8b510 bd10fc8f b08ab570 ............p...
01-25 17:39:01.516: I/DEBUG(1741): 404a2ec8 460eac01 f1b24613 bf143fff 21012100 ...F.F...?...!.!
01-25 17:39:01.516: I/DEBUG(1741): stack:
01-25 17:39:01.519: I/DEBUG(1741): 50df29c8 50df29e4
01-25 17:39:01.519: I/DEBUG(1741): 50df29cc 4049aeef /system/lib/libicuuc.so
01-25 17:39:01.519: I/DEBUG(1741): 50df29d0 01795148 [heap]
01-25 17:39:01.519: I/DEBUG(1741): 50df29d4 50df2a04
01-25 17:39:01.519: I/DEBUG(1741): 50df29d8 01795148 [heap]
01-25 17:39:01.519: I/DEBUG(1741): 50df29dc 4049b245 /system/lib/libicuuc.so
01-25 17:39:01.519: I/DEBUG(1741): 50df29e0 01795148 [heap]
01-25 17:39:01.519: I/DEBUG(1741): 50df29e4 00000000
01-25 17:39:01.519: I/DEBUG(1741): 50df29e8 01795148 [heap]
01-25 17:39:01.519: I/DEBUG(1741): 50df29ec 405477a4
01-25 17:39:01.519: I/DEBUG(1741): 50df29f0 50df2a58
01-25 17:39:01.519: I/DEBUG(1741): 50df29f4 01753c48 [heap]
01-25 17:39:01.519: I/DEBUG(1741): 50df29f8 50df2bb0
01-25 17:39:01.519: I/DEBUG(1741): 50df29fc 4049c4ab /system/lib/libicuuc.so
01-25 17:39:01.519: I/DEBUG(1741): 50df2a00 df0027ad
01-25 17:39:01.519: I/DEBUG(1741): 50df2a04 00000000
01-25 17:39:01.519: I/DEBUG(1741): #00 50df2a08 00000000
01-25 17:39:01.519: I/DEBUG(1741): 50df2a0c 405477a4
01-25 17:39:01.519: I/DEBUG(1741): 50df2a10 50df2a58
01-25 17:39:01.531: I/DEBUG(1741): 50df2a14 404a2eab /system/lib/libicuuc.so
01-25 17:39:01.531: I/DEBUG(1741): #01 50df2a18 00000000
01-25 17:39:01.531: I/DEBUG(1741): 50df2a1c 404d95f1 /system/lib/libicuuc.so
01-25 17:39:02.562: I/wpa_supplicant(279): wlan0: WPA: Group rekeying completed with 00:26:5a:fe:d8:00 [GTK=TKIP]
01-25 17:39:03.184: I/BootReceiver(151): Copying /data/tombstones/tombstone_08 to DropBox (SYSTEM_TOMBSTONE)