Use modern Logback for Java 21+ tests with better Virtual Threads support. by AlexeyKuznetsov-DD · Pull Request #10551 · DataDog/dd-trace-java

AlexeyKuznetsov-DD · 2026-02-06T20:44:00Z

What Does This Do

This PR reworks #9435 and follows up on #10535.

We upgrade Logback from 1.2.13 to a modern version that properly supports Java 21 and Virtual Threads. The currently used Logback version is known to have issues in Virtual Thread environments (see the Logback issue for details), which leads to intermittent CI hangs on Java 21.

Motivation

Unblock CI on Java 21+ and keep it green..

Additional Notes

With Logback 1.2.13, jobs frequently hang on Java 21 in GitLab CI. A typical blocked call path looks like this:

VirtualThreadPerTaskExecutorTest 
  → TraceDecorator.wrapAsyncResultOrFinishSpan 
    → DDSpan.finish() 
      → PendingTraceBuffer$DiscardingPendingTraceBuffer.enqueue() 
        → Logger.debug()  ← BLOCKED on logback lock

The root cause is that legacy Logback is not aware of Virtual Threads. When multiple virtual threads share the same carrier thread, Logback’s internal locking can lead to deadlocks.

Since this behavior only manifests on JDK 21+, upgrading to a Logback version designed with Java 21 and Virtual Thread support is the correct long-term fix.

Why not slf4j-simple?

slf4j-simple works because it is truly simple: it has no internal locking and just writes to stdout. However:

~99% of modules already use Logback
Switching logging implementations selectively feels hacky and inconsistent
slf4j-simple lacks many Logback fancy features

Using a modern Logback version keeps logging consistent across the codebase while properly supporting Virtual Threads.

…port.

pr-commenter · 2026-02-06T21:30:13Z

Benchmarks

Startup

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	alexeyk/fix-of-hanged-logback-java-21-plus
git_commit_date	1770407813	1770410653
git_commit_sha	`8880e3d`	`9a3fc44`
release_version	1.60.0-SNAPSHOT~8880e3d7c8	1.60.0-SNAPSHOT~9a3fc449f5

See matching parameters

	Baseline	Candidate
application	insecure-bank	insecure-bank
ci_job_date	1770412480	1770412480
ci_job_id	1407497675	1407497675
ci_pipeline_id	95067063	95067063
cpu_model	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz
kernel_version	Linux runner-zfyrx7zua-project-304-concurrent-0-bl6mzylf 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux	Linux runner-zfyrx7zua-project-304-concurrent-0-bl6mzylf 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux
module	Agent	Agent
parent	None	None

Summary

Found 0 performance improvements and 0 performance regressions! Performance is the same for 62 metrics, 9 unstable metrics.

Startup time reports for petclinic

gantt
    title petclinic - global startup overhead: candidate=1.60.0-SNAPSHOT~9a3fc449f5, baseline=1.60.0-SNAPSHOT~8880e3d7c8

    dateFormat X
    axisFormat %s
section tracing
Agent [baseline] (1.07 s) : 0, 1069577
Total [baseline] (10.936 s) : 0, 10936251
Agent [candidate] (1.072 s) : 0, 1071527
Total [candidate] (10.894 s) : 0, 10893720
section appsec
Agent [baseline] (1.239 s) : 0, 1239435
Total [baseline] (11.093 s) : 0, 11092795
Agent [candidate] (1.241 s) : 0, 1240677
Total [candidate] (11.093 s) : 0, 11092591
section iast
Agent [baseline] (1.25 s) : 0, 1249971
Total [baseline] (11.179 s) : 0, 11178652
Agent [candidate] (1.234 s) : 0, 1234240
Total [candidate] (11.19 s) : 0, 11189764
section profiling
Agent [baseline] (1.189 s) : 0, 1189130
Total [baseline] (10.967 s) : 0, 10966650
Agent [candidate] (1.207 s) : 0, 1206535
Total [candidate] (11.053 s) : 0, 11052589

baseline results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.07 s	-
Agent	appsec	1.239 s	169.858 ms (15.9%)
Agent	iast	1.25 s	180.394 ms (16.9%)
Agent	profiling	1.189 s	119.552 ms (11.2%)
Total	tracing	10.936 s	-
Total	appsec	11.093 s	156.543 ms (1.4%)
Total	iast	11.179 s	242.4 ms (2.2%)
Total	profiling	10.967 s	30.399 ms (0.3%)

candidate results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.072 s	-
Agent	appsec	1.241 s	169.15 ms (15.8%)
Agent	iast	1.234 s	162.713 ms (15.2%)
Agent	profiling	1.207 s	135.008 ms (12.6%)
Total	tracing	10.894 s	-
Total	appsec	11.093 s	198.872 ms (1.8%)
Total	iast	11.19 s	296.044 ms (2.7%)
Total	profiling	11.053 s	158.869 ms (1.5%)

gantt
    title petclinic - break down per module: candidate=1.60.0-SNAPSHOT~9a3fc449f5, baseline=1.60.0-SNAPSHOT~8880e3d7c8

    dateFormat X
    axisFormat %s
section tracing
crashtracking [baseline] (1.18 ms) : 0, 1180
crashtracking [candidate] (1.192 ms) : 0, 1192
BytebuddyAgent [baseline] (631.125 ms) : 0, 631125
BytebuddyAgent [candidate] (633.137 ms) : 0, 633137
AgentMeter [baseline] (28.987 ms) : 0, 28987
AgentMeter [candidate] (29.15 ms) : 0, 29150
GlobalTracer [baseline] (258.551 ms) : 0, 258551
GlobalTracer [candidate] (259.27 ms) : 0, 259270
AppSec [baseline] (32.827 ms) : 0, 32827
AppSec [candidate] (33.02 ms) : 0, 33020
Debugger [baseline] (62.379 ms) : 0, 62379
Debugger [candidate] (62.749 ms) : 0, 62749
Remote Config [baseline] (633.555 µs) : 0, 634
Remote Config [candidate] (633.88 µs) : 0, 634
Telemetry [baseline] (11.623 ms) : 0, 11623
Telemetry [candidate] (11.564 ms) : 0, 11564
Flare Poller [baseline] (6.885 ms) : 0, 6885
Flare Poller [candidate] (5.337 ms) : 0, 5337
section appsec
crashtracking [baseline] (1.176 ms) : 0, 1176
crashtracking [candidate] (1.181 ms) : 0, 1181
BytebuddyAgent [baseline] (658.421 ms) : 0, 658421
BytebuddyAgent [candidate] (658.714 ms) : 0, 658714
AgentMeter [baseline] (11.969 ms) : 0, 11969
AgentMeter [candidate] (11.967 ms) : 0, 11967
GlobalTracer [baseline] (258.949 ms) : 0, 258949
GlobalTracer [candidate] (259.117 ms) : 0, 259117
IAST [baseline] (25.309 ms) : 0, 25309
IAST [candidate] (25.28 ms) : 0, 25280
AppSec [baseline] (167.757 ms) : 0, 167757
AppSec [candidate] (168.198 ms) : 0, 168198
Debugger [baseline] (67.197 ms) : 0, 67197
Debugger [candidate] (67.433 ms) : 0, 67433
Remote Config [baseline] (670.496 µs) : 0, 670
Remote Config [candidate] (671.726 µs) : 0, 672
Telemetry [baseline] (9.096 ms) : 0, 9096
Telemetry [candidate] (9.085 ms) : 0, 9085
Flare Poller [baseline] (3.623 ms) : 0, 3623
Flare Poller [candidate] (3.69 ms) : 0, 3690
section iast
crashtracking [baseline] (1.199 ms) : 0, 1199
crashtracking [candidate] (1.175 ms) : 0, 1175
BytebuddyAgent [baseline] (808.533 ms) : 0, 808533
BytebuddyAgent [candidate] (796.993 ms) : 0, 796993
AgentMeter [baseline] (11.754 ms) : 0, 11754
AgentMeter [candidate] (11.28 ms) : 0, 11280
GlobalTracer [baseline] (250.819 ms) : 0, 250819
GlobalTracer [candidate] (248.93 ms) : 0, 248930
IAST [baseline] (27.414 ms) : 0, 27414
IAST [candidate] (27.071 ms) : 0, 27071
AppSec [baseline] (34.336 ms) : 0, 34336
AppSec [candidate] (33.26 ms) : 0, 33260
Debugger [baseline] (67.44 ms) : 0, 67440
Debugger [candidate] (67.315 ms) : 0, 67315
Remote Config [baseline] (549.418 µs) : 0, 549
Remote Config [candidate] (539.617 µs) : 0, 540
Telemetry [baseline] (8.796 ms) : 0, 8796
Telemetry [candidate] (8.805 ms) : 0, 8805
Flare Poller [baseline] (3.445 ms) : 0, 3445
Flare Poller [candidate] (3.535 ms) : 0, 3535
section profiling
crashtracking [baseline] (1.216 ms) : 0, 1216
crashtracking [candidate] (1.236 ms) : 0, 1236
BytebuddyAgent [baseline] (681.521 ms) : 0, 681521
BytebuddyAgent [candidate] (691.873 ms) : 0, 691873
AgentMeter [baseline] (8.778 ms) : 0, 8778
AgentMeter [candidate] (8.858 ms) : 0, 8858
GlobalTracer [baseline] (215.955 ms) : 0, 215955
GlobalTracer [candidate] (218.379 ms) : 0, 218379
AppSec [baseline] (32.253 ms) : 0, 32253
AppSec [candidate] (33.006 ms) : 0, 33006
Debugger [baseline] (67.731 ms) : 0, 67731
Debugger [candidate] (68.274 ms) : 0, 68274
Remote Config [baseline] (605.261 µs) : 0, 605
Remote Config [candidate] (617.213 µs) : 0, 617
Telemetry [baseline] (8.833 ms) : 0, 8833
Telemetry [candidate] (8.937 ms) : 0, 8937
Flare Poller [baseline] (3.741 ms) : 0, 3741
Flare Poller [candidate] (3.801 ms) : 0, 3801
ProfilingAgent [baseline] (98.617 ms) : 0, 98617
ProfilingAgent [candidate] (100.788 ms) : 0, 100788
Profiling [baseline] (99.179 ms) : 0, 99179
Profiling [candidate] (101.374 ms) : 0, 101374

Startup time reports for insecure-bank

gantt
    title insecure-bank - global startup overhead: candidate=1.60.0-SNAPSHOT~9a3fc449f5, baseline=1.60.0-SNAPSHOT~8880e3d7c8

    dateFormat X
    axisFormat %s
section tracing
Agent [baseline] (1.072 s) : 0, 1071738
Total [baseline] (8.753 s) : 0, 8753417
Agent [candidate] (1.068 s) : 0, 1067947
Total [candidate] (8.762 s) : 0, 8761887
section iast
Agent [baseline] (1.238 s) : 0, 1237770
Total [baseline] (9.387 s) : 0, 9387439
Agent [candidate] (1.231 s) : 0, 1231436
Total [candidate] (9.391 s) : 0, 9390992

baseline results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.072 s	-
Agent	iast	1.238 s	166.032 ms (15.5%)
Total	tracing	8.753 s	-
Total	iast	9.387 s	634.022 ms (7.2%)

candidate results

Module	Variant	Duration	Δ tracing
Agent	tracing	1.068 s	-
Agent	iast	1.231 s	163.489 ms (15.3%)
Total	tracing	8.762 s	-
Total	iast	9.391 s	629.104 ms (7.2%)

gantt
    title insecure-bank - break down per module: candidate=1.60.0-SNAPSHOT~9a3fc449f5, baseline=1.60.0-SNAPSHOT~8880e3d7c8

    dateFormat X
    axisFormat %s
section tracing
crashtracking [baseline] (1.217 ms) : 0, 1217
crashtracking [candidate] (1.189 ms) : 0, 1189
BytebuddyAgent [baseline] (632.665 ms) : 0, 632665
BytebuddyAgent [candidate] (630.056 ms) : 0, 630056
AgentMeter [baseline] (29.211 ms) : 0, 29211
AgentMeter [candidate] (28.997 ms) : 0, 28997
GlobalTracer [baseline] (259.416 ms) : 0, 259416
GlobalTracer [candidate] (258.246 ms) : 0, 258246
AppSec [baseline] (33.063 ms) : 0, 33063
AppSec [candidate] (32.824 ms) : 0, 32824
Debugger [baseline] (59.978 ms) : 0, 59978
Debugger [candidate] (60.412 ms) : 0, 60412
Remote Config [baseline] (638.382 µs) : 0, 638
Remote Config [candidate] (636.517 µs) : 0, 637
Telemetry [baseline] (11.534 ms) : 0, 11534
Telemetry [candidate] (13.083 ms) : 0, 13083
Flare Poller [baseline] (8.535 ms) : 0, 8535
Flare Poller [candidate] (7.002 ms) : 0, 7002
section iast
crashtracking [baseline] (1.184 ms) : 0, 1184
crashtracking [candidate] (1.181 ms) : 0, 1181
BytebuddyAgent [baseline] (801.459 ms) : 0, 801459
BytebuddyAgent [candidate] (795.545 ms) : 0, 795545
AgentMeter [baseline] (11.461 ms) : 0, 11461
AgentMeter [candidate] (11.24 ms) : 0, 11240
GlobalTracer [baseline] (248.848 ms) : 0, 248848
GlobalTracer [candidate] (248.473 ms) : 0, 248473
IAST [baseline] (26.933 ms) : 0, 26933
IAST [candidate] (26.849 ms) : 0, 26849
AppSec [baseline] (33.827 ms) : 0, 33827
AppSec [candidate] (34.755 ms) : 0, 34755
Debugger [baseline] (65.736 ms) : 0, 65736
Debugger [candidate] (65.265 ms) : 0, 65265
Remote Config [baseline] (553.612 µs) : 0, 554
Remote Config [candidate] (541.982 µs) : 0, 542
Telemetry [baseline] (8.809 ms) : 0, 8809
Telemetry [candidate] (8.741 ms) : 0, 8741
Flare Poller [baseline] (3.519 ms) : 0, 3519
Flare Poller [candidate] (3.492 ms) : 0, 3492

Load

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	alexeyk/fix-of-hanged-logback-java-21-plus
git_commit_date	1770407813	1770410653
git_commit_sha	`8880e3d`	`9a3fc44`
release_version	1.60.0-SNAPSHOT~8880e3d7c8	1.60.0-SNAPSHOT~9a3fc449f5

See matching parameters

	Baseline	Candidate
application	insecure-bank	insecure-bank
ci_job_date	1770412877	1770412877
ci_job_id	1407497676	1407497676
ci_pipeline_id	95067063	95067063
cpu_model	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz
kernel_version	Linux runner-zfyrx7zua-project-304-concurrent-0-37ysr3vj 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux	Linux runner-zfyrx7zua-project-304-concurrent-0-37ysr3vj 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

Summary

Found 2 performance improvements and 0 performance regressions! Performance is the same for 16 metrics, 18 unstable metrics.

scenario	Δ mean agg_http_req_duration_p50	Δ mean agg_http_req_duration_p95	Δ mean throughput	candidate mean agg_http_req_duration_p50	candidate mean agg_http_req_duration_p95	candidate mean throughput	baseline mean agg_http_req_duration_p50	baseline mean agg_http_req_duration_p95	baseline mean throughput
scenario:load:insecure-bank:iast_GLOBAL:high_load	better [-178.068µs; -61.652µs] or [-6.171%; -2.136%]	unstable [-4.416ms; +12.900ms] or [-54.851%; +160.245%]	unstable [-88.481op/s; +191.793op/s] or [-7.102%; +15.393%]	2.766ms	12.293ms	1297.594op/s	2.886ms	8.050ms	1245.938op/s
scenario:load:petclinic:no_agent:high_load	better [-2.005ms; -0.432ms] or [-11.140%; -2.402%]	unstable [-3.283ms; -0.019ms] or [-10.889%; -0.064%]	unstable [-12.044op/s; +43.106op/s] or [-4.745%; +16.981%]	16.778ms	28.496ms	269.375op/s	17.996ms	30.147ms	253.844op/s

Request duration reports for petclinic

gantt
    title petclinic - request duration [CI 0.99] : candidate=1.60.0-SNAPSHOT~9a3fc449f5, baseline=1.60.0-SNAPSHOT~8880e3d7c8
    dateFormat X
    axisFormat %s
section baseline
no_agent (18.382 ms) : 18192, 18572
.   : milestone, 18382,
appsec (18.961 ms) : 18771, 19151
.   : milestone, 18961,
code_origins (17.876 ms) : 17698, 18055
.   : milestone, 17876,
iast (17.658 ms) : 17482, 17834
.   : milestone, 17658,
profiling (18.428 ms) : 18243, 18613
.   : milestone, 18428,
tracing (17.927 ms) : 17751, 18103
.   : milestone, 17927,
section candidate
no_agent (17.317 ms) : 17145, 17490
.   : milestone, 17317,
appsec (18.603 ms) : 18417, 18789
.   : milestone, 18603,
code_origins (17.629 ms) : 17455, 17803
.   : milestone, 17629,
iast (17.921 ms) : 17744, 18098
.   : milestone, 17921,
profiling (18.943 ms) : 18751, 19136
.   : milestone, 18943,
tracing (18.597 ms) : 18412, 18783
.   : milestone, 18597,

baseline results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	18.382 ms [18.192 ms, 18.572 ms]	-
appsec	18.961 ms [18.771 ms, 19.151 ms]	578.699 µs (3.1%)
code_origins	17.876 ms [17.698 ms, 18.055 ms]	-505.581 µs (-2.8%)
iast	17.658 ms [17.482 ms, 17.834 ms]	-724.04 µs (-3.9%)
profiling	18.428 ms [18.243 ms, 18.613 ms]	45.971 µs (0.3%)
tracing	17.927 ms [17.751 ms, 18.103 ms]	-455.139 µs (-2.5%)

candidate results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	17.317 ms [17.145 ms, 17.49 ms]	-
appsec	18.603 ms [18.417 ms, 18.789 ms]	1.285 ms (7.4%)
code_origins	17.629 ms [17.455 ms, 17.803 ms]	311.41 µs (1.8%)
iast	17.921 ms [17.744 ms, 18.098 ms]	603.297 µs (3.5%)
profiling	18.943 ms [18.751 ms, 19.136 ms]	1.626 ms (9.4%)
tracing	18.597 ms [18.412 ms, 18.783 ms]	1.28 ms (7.4%)

Request duration reports for insecure-bank

gantt
    title insecure-bank - request duration [CI 0.99] : candidate=1.60.0-SNAPSHOT~9a3fc449f5, baseline=1.60.0-SNAPSHOT~8880e3d7c8
    dateFormat X
    axisFormat %s
section baseline
no_agent (1.197 ms) : 1185, 1208
.   : milestone, 1197,
iast (3.223 ms) : 3177, 3268
.   : milestone, 3223,
iast_FULL (6.127 ms) : 6063, 6191
.   : milestone, 6127,
iast_GLOBAL (3.682 ms) : 3615, 3750
.   : milestone, 3682,
profiling (2.11 ms) : 2091, 2129
.   : milestone, 2110,
tracing (1.768 ms) : 1753, 1782
.   : milestone, 1768,
section candidate
no_agent (1.192 ms) : 1180, 1204
.   : milestone, 1192,
iast (3.228 ms) : 3182, 3275
.   : milestone, 3228,
iast_FULL (6.017 ms) : 5955, 6078
.   : milestone, 6017,
iast_GLOBAL (3.539 ms) : 3482, 3595
.   : milestone, 3539,
profiling (1.997 ms) : 1979, 2015
.   : milestone, 1997,
tracing (1.884 ms) : 1867, 1901
.   : milestone, 1884,

baseline results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	1.197 ms [1.185 ms, 1.208 ms]	-
iast	3.223 ms [3.177 ms, 3.268 ms]	2.026 ms (169.3%)
iast_FULL	6.127 ms [6.063 ms, 6.191 ms]	4.93 ms (412.0%)
iast_GLOBAL	3.682 ms [3.615 ms, 3.75 ms]	2.486 ms (207.7%)
profiling	2.11 ms [2.091 ms, 2.129 ms]	913.506 µs (76.3%)
tracing	1.768 ms [1.753 ms, 1.782 ms]	571.159 µs (47.7%)

candidate results

Variant	Request duration [CI 0.99]	Δ no_agent
no_agent	1.192 ms [1.18 ms, 1.204 ms]	-
iast	3.228 ms [3.182 ms, 3.275 ms]	2.036 ms (170.8%)
iast_FULL	6.017 ms [5.955 ms, 6.078 ms]	4.825 ms (404.7%)
iast_GLOBAL	3.539 ms [3.482 ms, 3.595 ms]	2.347 ms (196.9%)
profiling	1.997 ms [1.979 ms, 2.015 ms]	804.735 µs (67.5%)
tracing	1.884 ms [1.867 ms, 1.901 ms]	692.122 µs (58.1%)

Dacapo

Parameters

	Baseline	Candidate
baseline_or_candidate	baseline	candidate
git_branch	master	alexeyk/fix-of-hanged-logback-java-21-plus
git_commit_date	1770407813	1770410653
git_commit_sha	`8880e3d`	`9a3fc44`
release_version	1.60.0-SNAPSHOT~8880e3d7c8	1.60.0-SNAPSHOT~9a3fc449f5

See matching parameters

	Baseline	Candidate
application	biojava	biojava
ci_job_date	1770412560	1770412560
ci_job_id	1407497677	1407497677
ci_pipeline_id	95067063	95067063
cpu_model	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz	Intel(R) Xeon(R) Platinum 8259CL CPU @ 2.50GHz
kernel_version	Linux runner-zfyrx7zua-project-304-concurrent-0-a4a4sh3s 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux	Linux runner-zfyrx7zua-project-304-concurrent-0-a4a4sh3s 6.8.0-1031-aws #33~22.04.1-Ubuntu SMP Thu Jun 26 14:22:30 UTC 2025 x86_64 x86_64 x86_64 GNU/Linux

Summary

Found 0 performance improvements and 0 performance regressions! Performance is the same for 11 metrics, 1 unstable metrics.

Execution time for biojava

gantt
    title biojava - execution time [CI 0.99] : candidate=1.60.0-SNAPSHOT~9a3fc449f5, baseline=1.60.0-SNAPSHOT~8880e3d7c8
    dateFormat X
    axisFormat %s
section baseline
no_agent (14.965 s) : 14965000, 14965000
.   : milestone, 14965000,
appsec (14.995 s) : 14995000, 14995000
.   : milestone, 14995000,
iast (18.256 s) : 18256000, 18256000
.   : milestone, 18256000,
iast_GLOBAL (17.671 s) : 17671000, 17671000
.   : milestone, 17671000,
profiling (15.001 s) : 15001000, 15001000
.   : milestone, 15001000,
tracing (14.494 s) : 14494000, 14494000
.   : milestone, 14494000,
section candidate
no_agent (15.476 s) : 15476000, 15476000
.   : milestone, 15476000,
appsec (14.945 s) : 14945000, 14945000
.   : milestone, 14945000,
iast (18.119 s) : 18119000, 18119000
.   : milestone, 18119000,
iast_GLOBAL (18.01 s) : 18010000, 18010000
.   : milestone, 18010000,
profiling (14.952 s) : 14952000, 14952000
.   : milestone, 14952000,
tracing (14.592 s) : 14592000, 14592000
.   : milestone, 14592000,

baseline results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	14.965 s [14.965 s, 14.965 s]	-
appsec	14.995 s [14.995 s, 14.995 s]	30.0 ms (0.2%)
iast	18.256 s [18.256 s, 18.256 s]	3.291 s (22.0%)
iast_GLOBAL	17.671 s [17.671 s, 17.671 s]	2.706 s (18.1%)
profiling	15.001 s [15.001 s, 15.001 s]	36.0 ms (0.2%)
tracing	14.494 s [14.494 s, 14.494 s]	-471.0 ms (-3.1%)

candidate results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	15.476 s [15.476 s, 15.476 s]	-
appsec	14.945 s [14.945 s, 14.945 s]	-531.0 ms (-3.4%)
iast	18.119 s [18.119 s, 18.119 s]	2.643 s (17.1%)
iast_GLOBAL	18.01 s [18.01 s, 18.01 s]	2.534 s (16.4%)
profiling	14.952 s [14.952 s, 14.952 s]	-524.0 ms (-3.4%)
tracing	14.592 s [14.592 s, 14.592 s]	-884.0 ms (-5.7%)

Execution time for tomcat

gantt
    title tomcat - execution time [CI 0.99] : candidate=1.60.0-SNAPSHOT~9a3fc449f5, baseline=1.60.0-SNAPSHOT~8880e3d7c8
    dateFormat X
    axisFormat %s
section baseline
no_agent (1.474 ms) : 1463, 1486
.   : milestone, 1474,
appsec (3.777 ms) : 3557, 3997
.   : milestone, 3777,
iast (2.259 ms) : 2190, 2328
.   : milestone, 2259,
iast_GLOBAL (2.297 ms) : 2227, 2366
.   : milestone, 2297,
profiling (2.098 ms) : 2042, 2154
.   : milestone, 2098,
tracing (2.061 ms) : 2007, 2114
.   : milestone, 2061,
section candidate
no_agent (1.475 ms) : 1463, 1486
.   : milestone, 1475,
appsec (3.758 ms) : 3539, 3977
.   : milestone, 3758,
iast (2.255 ms) : 2186, 2324
.   : milestone, 2255,
iast_GLOBAL (2.297 ms) : 2228, 2367
.   : milestone, 2297,
profiling (2.085 ms) : 2030, 2140
.   : milestone, 2085,
tracing (2.067 ms) : 2014, 2121
.   : milestone, 2067,

baseline results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	1.474 ms [1.463 ms, 1.486 ms]	-
appsec	3.777 ms [3.557 ms, 3.997 ms]	2.303 ms (156.2%)
iast	2.259 ms [2.19 ms, 2.328 ms]	784.42 µs (53.2%)
iast_GLOBAL	2.297 ms [2.227 ms, 2.366 ms]	822.175 µs (55.8%)
profiling	2.098 ms [2.042 ms, 2.154 ms]	623.856 µs (42.3%)
tracing	2.061 ms [2.007 ms, 2.114 ms]	586.26 µs (39.8%)

candidate results

Variant	Execution Time [CI 0.99]	Δ no_agent
no_agent	1.475 ms [1.463 ms, 1.486 ms]	-
appsec	3.758 ms [3.539 ms, 3.977 ms]	2.284 ms (154.8%)
iast	2.255 ms [2.186 ms, 2.324 ms]	780.16 µs (52.9%)
iast_GLOBAL	2.297 ms [2.228 ms, 2.367 ms]	822.405 µs (55.8%)
profiling	2.085 ms [2.03 ms, 2.14 ms]	610.097 µs (41.4%)
tracing	2.067 ms [2.014 ms, 2.121 ms]	592.589 µs (40.2%)

Use latest logback for Java 21+ tests with better virtual thread sup…

49336d3

…port.

AlexeyKuznetsov-DD requested review from bric3, mcculls and sarahchen6 February 6, 2026 20:44

AlexeyKuznetsov-DD self-assigned this Feb 6, 2026

AlexeyKuznetsov-DD added type: bug Bug report and fix inst: java Core Java language instrumentation labels Feb 6, 2026

AlexeyKuznetsov-DD marked this pull request as ready for review February 6, 2026 20:44

AlexeyKuznetsov-DD requested review from a team as code owners February 6, 2026 20:44

Merge branch 'master' into alexeyk/fix-of-hanged-logback-java-21-plus

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sarahchen6 approved these changes Feb 6, 2026

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Use modern Logback for Java 21+ tests with better Virtual Threads support.#10551

Use modern Logback for Java 21+ tests with better Virtual Threads support.#10551
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AlexeyKuznetsov-DD commented Feb 6, 2026

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Why not slf4j-simple?

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