Q:

High cpu/gc activity followed by crash

I'm running a JAVA Jetty web server (with Jetty Maven plugin) with a high request/second rate. 
After a while of initiating, the app is using almost 100% of the cpu.  With some research, we found that the GC is running full gc various times before the crash. 
Maven and Java options:
MAVEN_OPTS="-XX:PermSize=128m -XX:MaxPermSize=512m -Xmx6000m -javaagent:/home/apalabrados/.m2/repository/org/springframework/spring-instrument/3.1.1.RELEASE/spring-instrument-3.1.1.RELEASE.jar -javaagent:/opt/newrelic/newrelic.jar -Dcom.sun.management.jmxremote -Dcom.sun.management.jmxremote.port=9010 -Dcom.sun.management.jmxremote.local.only=false -Dcom.sun.management.jmxremote.authenticate=false -Dcom.sun.management.jmxremote.ssl=false -Djava.rmi.server.hostname=54.226.189.175 -Xloggc:/mnt/gc.log"

Maven -version:
Apache Maven 3.0.4 (r1232337; 2012-01-17 03:44:56-0500)
Maven home: /opt/maven
Java version: 1.7.0_60, vendor: Oracle Corporation
Java home: /opt/java/jdk1.7.0_60/jre
Default locale: en_US, platform encoding: UTF-8
OS name: "linux", version: "2.6.16.33-xenu", arch: "amd64", family: "unix"

Here's the jvisualvm output:

Don't mind the pause around 5:17 PM.  We ran a heap dump there.  It happened many other times without running it. 
I've collected the GC log also but got no significant information, more than we have a lot of object creation and release.  
Did someone get through a similar situation and could guide me to an idea or a tool to analyze this problem?  Is there any way to detect a memory leak through GC sweep analysis? 
Here's the gc.log:
1.499: [GC 61440K->7644K(235520K), 0.0120470 secs]
2.699: [GC 69084K->10335K(235520K), 0.0134050 secs]
3.279: [GC 71775K->9751K(235520K), 0.0124680 secs]
3.831: [GC 71191K->12271K(296960K), 0.0244350 secs]
5.659: [GC 135151K->17751K(296960K), 0.0301720 secs]
6.428: [GC 140631K->19051K(424960K), 0.0258600 secs]
6.792: [GC 264811K->18709K(425472K), 0.0202690 secs]
7.073: [GC 264469K->18709K(670720K), 0.0092640 secs]
7.757: [GC 509205K->18711K(671744K), 0.0064060 secs]
8.264: [GC 509207K->18775K(966144K), 0.0013700 secs]
9.385: [GC 803159K->18775K(966656K), 0.0021650 secs]
10.470: [GC 803159K->18775K(1438208K), 0.0011310 secs]
12.365: [GC 1274199K->18839K(1360384K), 0.0011500 secs]
13.577: [GC 1214871K->18847K(1303552K), 0.0012290 secs]
14.718: [GC 1158047K->18855K(1267712K), 0.0011240 secs]
15.835: [GC 1104295K->18863K(1198592K), 0.0053350 secs]
16.935: [GC 1053103K->18839K(1166848K), 0.0014530 secs]
17.949: [GC 1004439K->18975K(1103872K), 0.0051870 secs]
18.924: [GC 958495K->18935K(1075200K), 0.0011990 secs]
19.878: [GC 914423K->19000K(1018368K), 0.0046680 secs]
20.968: [GC 873016K->19000K(992768K), 0.0010440 secs]
22.050: [GC 833592K->19000K(941568K), 0.1194060 secs]
23.053: [GC 796216K->19064K(918528K), 0.0014730 secs]
23.813: [GC 760440K->19072K(871936K), 0.0040810 secs]
24.540: [GC 726656K->19048K(850944K), 0.0014350 secs]
25.224: [GC 694376K->19088K(808960K), 0.0040980 secs]
25.866: [GC 663696K->19088K(789504K), 0.0014640 secs]
26.481: [GC 634512K->19152K(752128K), 0.0036950 secs]
27.218: [GC 606928K->19128K(734720K), 0.0014220 secs]
27.888: [GC 580792K->19160K(700928K), 0.0035020 secs]
28.440: [GC 555736K->19256K(684544K), 0.0015560 secs]
31.329: [GC 781156K->314136K(949760K), 0.0042560 secs]
37.385: [GC 804120K->549570K(1289216K), 0.2488560 secs]
49.073: [GC 1162434K->594663K(1261568K), 0.0662530 secs]
49.140: [Full GC 594663K->82634K(882688K), 0.3667660 secs]
53.656: [GC 667850K->117231K(1000448K), 0.0428860 secs]
59.351: [GC 792559K->143832K(1128448K), 0.1040000 secs]
61.878: [GC 929752K->643702K(1555456K), 0.6804850 secs]
62.558: [Full GC 643702K->617207K(1963520K), 2.8812430 secs]
67.391: [GC 1527543K->1000573K(2088960K), 0.7067240 secs]
68.097: [Full GC 1000573K->991784K(2585088K), 3.1011780 secs]
72.553: [GC 1841192K->1314882K(2701312K), 0.6809580 secs]
74.965: [GC 2136253K->1844959K(2574848K), 0.9235580 secs]
75.889: [Full GC 1844959K->1842339K(3190272K), 6.0295190 secs]
82.983: [GC 2517667K->2044889K(3423744K), 0.9600750 secs]
83.943: [Full GC 2044889K->1831781K(4016128K), 4.2142270 secs]
89.234: [GC 2505682K->2185552K(4028928K), 0.4127690 secs]
90.782: [GC 2891247K->2375033K(3916800K), 0.5920890 secs]
92.957: [GC 3086201K->2564333K(4027392K), 0.7920020 secs]
95.896: [GC 3247341K->2626200K(4027392K), 0.5745350 secs]
96.471: [Full GC 2626200K->2619897K(5012992K), 5.5746770 secs]
103.773: [GC 3302905K->2681641K(5012992K), 0.1234280 secs]
168.549: [GC 3364649K->2676119K(5012992K), 0.1320450 secs]
170.700: [GC 3371999K->3051400K(5012992K), 0.1319660 secs]
172.516: [GC 3734410K->2682189K(5012992K), 0.1214520 secs]
176.063: [GC 3365197K->2671799K(5012992K), 0.1606770 secs]
179.177: [GC 3354807K->2671123K(5012992K), 0.1226220 secs]
181.998: [GC 3354131K->2670544K(4976128K), 0.1093350 secs]
184.752: [GC 3353552K->2671647K(4335104K), 0.1159500 secs]
187.379: [GC 3354655K->2669489K(4937216K), 0.1204930 secs]
189.888: [GC 3369905K->2670348K(4351488K), 0.0916450 secs]
192.076: [GC 3370764K->2671982K(4896256K), 0.0905400 secs]
194.073: [GC 3388270K->2671739K(4368384K), 0.1035390 secs]
196.116: [GC 3388027K->2671760K(4854272K), 0.0939740 secs]
197.905: [GC 3402896K->2674545K(4386304K), 0.0913640 secs]
199.688: [GC 3405681K->2677264K(4814848K), 0.0949850 secs]
201.516: [GC 3423760K->2696736K(4423680K), 0.1155460 secs]
203.142: [GC 3443232K->2711049K(4768768K), 0.1137520 secs]
205.239: [GC 3474953K->2703962K(4448256K), 0.1208140 secs]
207.405: [GC 3467866K->2707451K(4736000K), 0.1211140 secs]
209.625: [GC 3488763K->2705569K(4467200K), 0.1238950 secs]
212.012: [GC 3486881K->2702818K(4712960K), 0.1044980 secs]
214.086: [GC 3501026K->2702421K(4480512K), 0.0865790 secs]
216.401: [GC 3500629K->2706221K(4694016K), 0.1068410 secs]
218.647: [GC 3520813K->2702911K(4712960K), 0.1104230 secs]
220.946: [GC 3517503K->2704774K(4682240K), 0.1222490 secs]
222.996: [GC 3536774K->2705598K(4697600K), 0.1077060 secs]
225.043: [GC 3537598K->2705634K(4675072K), 0.1222020 secs]
227.271: [GC 3556066K->2702994K(4687872K), 0.1027970 secs]
229.888: [GC 3553426K->2701963K(4671488K), 0.1179580 secs]
232.156: [GC 3570315K->2703940K(4682752K), 0.1054530 secs]
234.472: [GC 3572292K->2702254K(4674048K), 0.1011400 secs]
236.784: [GC 3588526K->2703318K(4682240K), 0.1181500 secs]
238.888: [GC 3589590K->2714847K(4681216K), 0.1103460 secs]
240.745: [GC 3620063K->2738332K(4688384K), 0.1200060 secs]
243.287: [GC 3643548K->2738131K(4682240K), 0.1030970 secs]
245.779: [GC 3663315K->2746074K(4691456K), 0.1116630 secs]
248.299: [GC 3671258K->2737044K(4690432K), 0.1028660 secs]
250.721: [GC 3681172K->2736814K(4698624K), 0.1163070 secs]
253.395: [GC 3680942K->2741374K(4700672K), 0.1077050 secs]
257.305: [GC 3704446K->2744574K(4705792K), 0.1154280 secs]
259.993: [GC 3707646K->2747490K(4715008K), 0.0973580 secs]
262.478: [GC 3727970K->2746337K(4717568K), 0.1174640 secs]
265.214: [GC 3726817K->2747432K(4729344K), 0.1168990 secs]
268.018: [GC 3746344K->2748090K(4731392K), 0.0966240 secs]
271.150: [GC 3747002K->2747048K(4741120K), 0.1082590 secs]
273.614: [GC 3763368K->2759423K(4744192K), 0.1082620 secs]
276.447: [GC 3775743K->2759649K(4763648K), 0.1237910 secs]
279.371: [GC 3792865K->2756841K(4765184K), 0.1113540 secs]
281.532: [GC 3790057K->2757896K(4782080K), 0.1078550 secs]
284.264: [GC 3810568K->2757376K(4781568K), 0.1065630 secs]
287.181: [GC 3810048K->2759906K(4795392K), 0.0879670 secs]
289.789: [GC 3831010K->2759543K(4797952K), 0.0994050 secs]
292.294: [GC 3830647K->2772912K(4809728K), 0.1130040 secs]
294.815: [GC 3863472K->2806710K(4812800K), 0.1195040 secs]
297.782: [GC 3897270K->2804618K(4836864K), 0.1245710 secs]
300.448: [GC 3912074K->2807630K(4840448K), 0.1211280 secs]
303.155: [GC 3915086K->2807308K(4864000K), 0.1191050 secs]
306.093: [GC 3934732K->2809680K(4865536K), 0.1268630 secs]
308.853: [GC 3937104K->2818580K(4885504K), 0.1246500 secs]
312.046: [GC 3963412K->2815443K(4890112K), 0.1173920 secs]
314.725: [GC 3960275K->2826572K(4911104K), 0.1553190 secs]
318.089: [GC 3990348K->2826604K(4913664K), 0.1324180 secs]
321.033: [GC 3990380K->2827701K(4936704K), 0.1363310 secs]
324.272: [GC 4012981K->2825759K(4938240K), 0.1345190 secs]
327.234: [GC 4011039K->2831580K(4959744K), 0.1375630 secs]
330.314: [GC 4038364K->2827398K(4961280K), 0.1283290 secs]
333.229: [GC 4034182K->2827799K(4981760K), 0.1313840 secs]
336.596: [GC 4058647K->2830961K(4982784K), 0.1273130 secs]
339.917: [GC 4061809K->2829995K(5005312K), 0.1347070 secs]
343.168: [GC 4083883K->2829372K(5005824K), 0.1173740 secs]
346.708: [GC 4083260K->2830356K(5026816K), 0.1170540 secs]
349.755: [GC 4106260K->2830115K(5027840K), 0.1122110 secs]
352.978: [GC 4106019K->2829393K(5045760K), 0.1214530 secs]
356.502: [GC 4127313K->2834253K(5047296K), 0.1205870 secs]
359.867: [GC 4132173K->2835471K(5065728K), 0.0889700 secs]
363.525: [GC 4153871K->2840666K(5067776K), 0.1161790 secs]
367.442: [GC 4159066K->2842260K(5082112K), 0.0987980 secs]
371.062: [GC 4180116K->2847297K(5084672K), 0.1086770 secs]
374.661: [GC 4185153K->2857290K(5093376K), 0.1313160 secs]
378.565: [GC 4215114K->2856874K(5097472K), 0.1254220 secs]
382.094: [GC 4214698K->2857452K(5105664K), 0.1202040 secs]
385.370: [GC 4235756K->2881525K(5109760K), 0.1226390 secs]
388.618: [GC 4259829K->2880106K(5132800K), 0.1269360 secs]
392.075: [GC 4279402K->2879101K(5133312K), 0.1265580 secs]
395.698: [GC 4278397K->2879578K(5154304K), 0.1202890 secs]
398.427: [GC 4301402K->2906754K(5154816K), 0.1270330 secs]
401.953: [GC 4328578K->2907187K(5181440K), 0.1377130 secs]
405.726: [GC 4346419K->2906453K(5188608K), 0.1348810 secs]
409.319: [GC 4345685K->2901761K(5216768K), 0.1356850 secs]
412.836: [GC 4363521K->2914802K(5218816K), 0.1330720 secs]
416.075: [GC 4376562K->2928451K(5240832K), 0.1488830 secs]
420.181: [GC 4407107K->2924474K(5249024K), 0.1415160 secs]
424.048: [GC 4403130K->2926226K(5277184K), 0.1395830 secs]
427.646: [GC 4430482K->2928018K(5277184K), 0.1276150 secs]
431.113: [GC 4432274K->2925485K(5291008K), 0.1198850 secs]
434.863: [GC 4454829K->2940590K(5295616K), 0.1382240 secs]
438.851: [GC 4469934K->2938781K(5311488K), 0.1295270 secs]
442.884: [GC 4492701K->2937566K(5317120K), 0.1440960 secs]
446.898: [GC 4491486K->2944314K(5330432K), 0.1364070 secs]
451.133: [GC 4523322K->2937894K(5334528K), 0.1053120 secs]
455.043: [GC 4516902K->2946759K(5355520K), 0.1445050 secs]
459.010: [GC 4549831K->2947447K(5355008K), 0.1048870 secs]
462.689: [GC 4550519K->2946671K(5374976K), 0.1219330 secs]
466.503: [GC 4573295K->2963393K(5376000K), 0.1270760 secs]
470.927: [GC 4590017K->2959873K(5392384K), 0.1229860 secs]
475.170: [GC 4610049K->2959712K(5394432K), 0.1192640 secs]
479.092: [GC 4609888K->2969327K(5413888K), 0.1104220 secs]
482.815: [GC 4642543K->2985450K(5415936K), 0.1124460 secs]
486.748: [GC 4658666K->2982265K(5432832K), 0.1302470 secs]
490.046: [GC 4679033K->3022858K(5434880K), 0.1427400 secs]
494.466: [GC 4719626K->3022955K(5471232K), 0.1644750 secs]
498.716: [GC 4743787K->3029034K(5473280K), 0.1307170 secs]
502.135: [GC 4749866K->3078764K(5481984K), 0.1810790 secs]
505.446: [GC 4804716K->3096042K(5503488K), 0.1507150 secs]
509.649: [GC 4821994K->3097323K(5529600K), 0.1586240 secs]
514.209: [GC 4836075K->3096819K(5506048K), 0.1399260 secs]
517.525: [GC 4835571K->3140631K(5492224K), 0.1750810 secs]
522.107: [GC 4824087K->3134775K(5474304K), 0.1708960 secs]
526.575: [GC 4818231K->3133871K(5489664K), 0.1618120 secs]
531.061: [GC 4784559K->3132405K(5438976K), 0.1456150 secs]
534.842: [GC 4783093K->3160326K(5466112K), 0.1893020 secs]
538.979: [GC 4776198K->3161687K(5424640K), 0.1588550 secs]
543.380: [GC 4777559K->3155091K(5474304K), 0.1695350 secs]
547.073: [GC 4758675K->3184611K(5421056K), 0.1952130 secs]
551.148: [GC 4788195K->3187849K(5451776K), 0.1654520 secs]
554.777: [GC 4762761K->3181217K(5388288K), 0.1827070 secs]
559.019: [GC 4756129K->3181157K(5456896K), 0.1886390 secs]
563.046: [GC 4751461K->3185223K(5350912K), 0.1745280 secs]
565.998: [GC 4755527K->3252200K(5443584K), 0.2152420 secs]
569.709: [GC 4819432K->3267572K(5446656K), 0.1809990 secs]
573.586: [GC 4834804K->3267739K(5449216K), 0.1867050 secs]
577.454: [GC 4831387K->3265648K(5349376K), 0.1869730 secs]
581.502: [GC 4829296K->3276802K(5456896K), 0.1580800 secs]
584.815: [GC 4852226K->3281238K(5449216K), 0.1770960 secs]
588.950: [GC 4856662K->3279733K(5461504K), 0.1635150 secs]
592.871: [GC 4873589K->3285744K(5455360K), 0.1722840 secs]
596.880: [GC 4879600K->3290580K(5475328K), 0.1827670 secs]
601.325: [GC 4909012K->3288510K(5470720K), 0.1264210 secs]
604.174: [GC 4906942K->3343347K(5478912K), 0.1988830 secs]
608.151: [GC 4974067K->3345739K(5481984K), 0.1856410 secs]
612.292: [GC 4976459K->3348003K(5487104K), 0.1764590 secs]
616.020: [GC 4982307K->3363644K(5465600K), 0.1915960 secs]
620.204: [GC 4997948K->3356767K(5478912K), 0.1866870 secs]
624.531: [GC 4974687K->3353409K(5381632K), 0.2094420 secs]
628.655: [GC 4971329K->3365057K(5479936K), 0.1617780 secs]
632.223: [GC 4981953K->3380315K(5392896K), 0.1734390 secs]
636.319: [GC 4997211K->3394047K(5482496K), 0.1676130 secs]
640.879: [GC 5017087K->3394525K(5476352K), 0.1620290 secs]
644.995: [GC 5017565K->3397318K(5481472K), 0.1679770 secs]
649.320: [GC 5029574K->3400067K(5479424K), 0.1512770 secs]
653.463: [GC 5032323K->3406275K(5492736K), 0.1787830 secs]
657.074: [GC 5055939K->3424181K(5491712K), 0.1814630 secs]
661.627: [GC 5073845K->3419096K(5496832K), 0.1614760 secs]
666.063: [GC 5081048K->3419336K(5494784K), 0.1786270 secs]
670.363: [GC 5081288K->3423488K(5502464K), 0.1395200 secs]
674.741: [GC 5089536K->3425836K(5402112K), 0.1573880 secs]
679.237: [GC 5091884K->3423987K(5499904K), 0.1534250 secs]
683.492: [GC 5084915K->3425348K(5501952K), 0.1477920 secs]
687.255: [GC 5086276K->3435330K(5496832K), 0.1494340 secs]
690.765: [GC 5096258K->3487387K(5499392K), 0.1873510 secs]
693.980: [GC 5148315K->3538570K(5483520K), 0.1974280 secs]
698.362: [GC 5186186K->3545357K(5452288K), 0.1753090 secs]
702.342: [GC 5192973K->3540763K(5483008K), 0.1718210 secs]
706.158: [GC 5169947K->3539836K(5486080K), 0.1676040 secs]
710.498: [GC 5169020K->3533045K(5476352K), 0.1508310 secs]
714.464: [GC 5163765K->3538685K(5481984K), 0.1603150 secs]
718.520: [GC 5169405K->3540570K(5478400K), 0.1560510 secs]
721.950: [GC 5185626K->3542957K(5485568K), 0.1610350 secs]
725.698: [GC 5188013K->3544356K(5490176K), 0.1614740 secs]
729.577: [GC 5212452K->3545439K(5496832K), 0.1571760 secs]
733.983: [GC 5213535K->3546135K(5502976K), 0.1411260 secs]
738.289: [GC 5236247K->3546909K(5509632K), 0.1606130 secs]
742.542: [GC 5237021K->3551334K(5513728K), 0.1477740 secs]
746.287: [GC 5259366K->3572688K(5519872K), 0.1700300 secs]
750.480: [GC 5280720K->3576025K(5528576K), 0.1558250 secs]
754.954: [GC 5290201K->3578800K(5423616K), 0.1813190 secs]
759.506: [GC 5292976K->3577713K(5510144K), 0.1082080 secs]
763.631: [GC 5266289K->3580202K(5386752K), 0.1421280 secs]
768.308: [GC 5268778K->3580052K(5508608K), 0.1076640 secs]
771.933: [GC 5257364K->3616569K(5411328K), 0.1415520 secs]
775.366: [GC 5293881K->3653385K(5507072K), 0.1681310 secs]
779.364: [GC 5333257K->3661018K(5506048K), 0.1551540 secs]
783.775: [GC 5340890K->3660401K(5516288K), 0.1548570 secs]
787.665: [GC 5350001K->3653284K(5446656K), 0.1538160 secs]
791.435: [GC 5342884K->3676352K(5507072K), 0.1529650 secs]
796.029: [GC 5362880K->3662743K(5510144K), 0.1563520 secs]
800.558: [GC 5349271K->3662844K(5513728K), 0.1710580 secs]
804.906: [GC 5362172K->3663230K(5516288K), 0.1482320 secs]
809.315: [GC 5362558K->3662776K(5523456K), 0.1484450 secs]
814.172: [GC 5376952K->3669442K(5523456K), 0.1614000 secs]
817.854: [GC 5383618K->3670707K(5531136K), 0.1444250 secs]
822.157: [GC 5397683K->3668915K(5530112K), 0.1498340 secs]
826.481: [GC 5395891K->3673408K(5536768K), 0.1441890 secs]
830.836: [GC 5412160K->3674472K(5536256K), 0.1558090 secs]
834.991: [GC 5413224K->3673214K(5540352K), 0.1691030 secs]
839.413: [GC 5419134K->3684030K(5541888K), 0.1322270 secs]
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1494.693: [Full GC 5919875K->4116448K(6032896K), 10.1368700 secs]
1508.512: [Full GC 5921778K->4120445K(6032896K), 9.1725230 secs]
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1540.424: [Full GC 5921694K->4167511K(6032896K), 5.4013940 secs]
1549.700: [Full GC 5921548K->4164288K(6032896K), 5.2783960 secs]
1558.860: [Full GC 5921386K->4162930K(6032896K), 6.6543130 secs]
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1579.282: [Full GC 5921590K->4162837K(6032896K), 5.1936220 secs]
1588.510: [Full GC 5921434K->4163549K(6032896K), 6.5699810 secs]
1598.852: [Full GC 5921767K->4167412K(6032896K), 5.8504890 secs]
1608.076: [Full GC 5921603K->4205587K(6032896K), 5.4929970 secs]
1617.220: [Full GC 5921543K->4198405K(6032896K), 6.0725330 secs]
1626.892: [Full GC 5921421K->4192351K(6032896K), 6.0990110 secs]
1636.348: [Full GC 5921334K->4201010K(6032896K), 6.1280120 secs]
1646.380: [Full GC 5921762K->4198287K(6032896K), 5.3571270 secs]
1655.530: [Full GC 5921619K->4205816K(6032896K), 6.2468180 secs]
1662.805: [Full GC 4542963K->1722668K(6032896K), 3.6291470 secs]

A:

We found the problem using Eclipse memory analyzer.  We let the aplication run until the RAM was almost maxed out, did a heap dump, and find the problem with Eclipse's tool. 
It turns out that java-mpns (a Java client to send push notifications to microsoft phones) uses a fixed thread pool which has an unbounded LinkedBlockingQueue.  Although it only has 10 threads to execute tasks, it keeps an "infinite" (Integer. MAX_VALUE) amount of tasks waiting.  Over time, this consumes a lot of RAM that is not released by the GC.  That's why there was a lot of GC activity, CPU activity, and why we couldn't trace the java threads that were consuming the CPU.