bilsch-nice opened a new issue, #6309:
URL: https://github.com/apache/jmeter/issues/6309
### Expected behavior
Jmeter script with JSR223 PreProcessor vars.put does not leak memory /
classes
### Actual behavior
I have a very simple script. Its a single http post with a json body and a
dynamic variable ${trace_id}. The value of trace_id is being set in a JR223
PreProcessor as follows:
```
vars.put("trace_id","${__groovy(org.apache.commons.codec.binary.Hex.encodeHexString('${__RandomString(16,abcdefghijklmnopqrstuvwxy0123456789)}'.getBytes('UTF-8')),)}");
```
When I run the load test I eventually get an out of memory metaspace error.
When I profiled a heap dump I took during ramp-up I see a large number of
“org.codehaus.groovy.reflection.ClassInfo” classes. From the eclipse MAT:
```
The class “org.codehaus.groovy.reflection.ClassInfo”, loaded by
“org.apache.jmeter.DynamicClassLoader @ 0x7000393f8”, occupies 1,142,999,600
(78.19%) bytes.
Thread “java.util.TimerThread @ 0x7000012b0 Timer-0” has a local variable or
reference to “org.apache.jmeter.DynamicClassLoader @ 0x7000393f8” which is on
the shortest path to “class org.codehaus.groovy.reflection.ClassInfo @
0x7f6ad7f20”. The thread java.util.TimerThread @ 0x7000012b0 Timer-0 keeps
local variables with total size 656 (0.00%) bytes.
The stacktrace of this Thread is available. [See
stacktrace](file:///C:/Users/Bill.Schwanitz/AppData/Local/Temp/report5826567611452268886/pages/25.html).
Keywords
org.codehaus.groovy.reflection.ClassInfo
org.apache.jmeter.DynamicClassLoader
```
I hope these come out ok - this is copy/paste from the MAT report.
---
Accumulated objects in dominator tree:
```
Accumulated Objects in Dominator Tree
Class Name
Shallow Heap
Retained Heap
Percentage
[class org.codehaus.groovy.reflection.ClassInfo @
0x7f6ad7f20](mat://object/0x7f6ad7f20)
24 1,142,999,600 78.19%
+[org.codehaus.groovy.reflection.ClassInfo$GlobalClassSet @
0x7f6ad88e8](mat://object/0x7f6ad88e8)
16 1,142,999,504 78.19%
+[org.codehaus.groovy.util.ManagedConcurrentLinkedQueue @
0x7f6adab78](mat://object/0x7f6adab78)
24 72 0.00%
\Total: 2 entries
40 1,142,999,576 78.19%
```
All accumulated objects by class:
```
Class Name
Objects
Shallow Heap
[org.codehaus.groovy.runtime.metaclass.MetaMethodIndex$Entry](mat://object/0x7016ea528)
[First 10 of 7,171,913
objects](mat://query/list_objects+0x70171d498+0x70171d460+0x70171d428+0x70171d3f0+0x70171d3b8+0x70171d380+0x70171d348+0x70171d310+0x70171d2d8+0x70171d2a0)
7,171,913 401,627,128
[java.lang.Object[]](mat://object/0x70007d520)
[First 10 of 5,117,122
objects](mat://query/list_objects+0x70171d170+0x70171d108+0x70171d0a0+0x70171e5d8+0x70171d030+0x70171c6c0+0x701718af8+0x70171c690+0x701718a90+0x70171c348)
5,117,122 135,216,720
[org.codehaus.groovy.util.FastArray](mat://object/0x7f6ad8238)
[First 10 of 5,117,122
objects](mat://query/list_objects+0x7016eaa50+0x70171d158+0x70171d0f0+0x70171d088+0x70171e5c0+0x70171d018+0x70171c6d8+0x701718ae0+0x70171c6a8+0x701718a78)
5,117,122 122,810,928
[java.util.HashMap$Node](mat://object/0x700c947c0)
[First 10 of 2,674,884
objects](mat://query/list_objects+0x701717e40+0x70170d900+0x70170df58+0x701703b08+0x701701de0+0x701701ee8+0x701745c20+0x701745c00+0x701745500+0x7017454e0)
2,674,884 85,596,288
[org.codehaus.groovy.util.ComplexKeyHashMap$Entry[]](mat://object/0x7f6ad7e40)
[First 10 of 542,728
objects](mat://query/list_objects+0x701748338+0x7016e8700+0x701747d70+0x701747c00+0x701747b38+0x701747cc8+0x701747f88+0x701747ee0+0x701747e38+0x7016ea3f0)
542,728 78,153,728
[org.codehaus.groovy.util.SingleKeyHashMap$Entry](mat://object/0x7016ea728)
[First 10 of 1,395,704
objects](mat://query/list_objects+0x7017482f8+0x7017482d8+0x7017482b8+0x701748298+0x701748278+0x701748258+0x701748238+0x7017481d8+0x701748138+0x701748118)
1,395,704 44,662,528
[java.lang.reflect.Method](mat://object/0x700002f80)
[First 10 of 465,682
objects](mat://query/list_objects+0x7016fddc0+0x7016f9c30+0x7016fe550+0x7016fa7c0+0x7016fe4f8+0x7016fa730+0x7016fe4a0+0x7016fa6d8+0x7016fe3f0+0x7016fa5d8)
465,682 40,980,016
[org.codehaus.groovy.runtime.metaclass.MetaMethodIndex$Entry[]](mat://object/0x7016ea600)
[First 10 of 38,766
objects](mat://query/list_objects+0x70171d4d0+0x7018a5868+0x702351b28+0x701fea940+0x702407760+0x701ffcd10+0x7022052f8+0x701f53638+0x701f4b148+0x702284c10)
38,766 40,319,712
[java.util.HashMap$Node[]](mat://object/0x700c94848)
[First 10 of 77,545
objects](mat://query/list_objects+0x701717e60+0x70170d920+0x70170df78+0x701703b28+0x701701e00+0x701701f08+0x701745c40+0x701745520+0x701704958+0x70170da08)
77,545 21,399,224
[groovy.lang.MetaBeanProperty](mat://object/0x7020be0b8)
[First 10 of 620,285
objects](mat://query/list_objects+0x701747a20+0x7017427b8+0x701742718+0x7017426d8+0x701742648+0x701742608+0x7017425c8+0x701742338+0x701742258+0x701742318)
620,285 19,849,120
[java.lang.reflect.Field](mat://object/0x700b0bd20)
[First 10 of 232,746
objects](mat://query/list_objects+0x70173ec08+0x70173ddf8+0x70173ebc0+0x70173dd70+0x70173eb30+0x70173dbf0+0x70173eae8+0x70173db68+0x70173eaa0+0x70173dae0)
232,746 16,757,712
[org.codehaus.groovy.reflection.CachedMethod](mat://object/0x7f6ac2800)
[First 10 of 232,841
objects](mat://query/list_objects+0x701700c40+0x7017011c0+0x701701180+0x701701140+0x7017010c0+0x701701000+0x701700e80+0x701700c80+0x701700b80+0x701700740)
232,841 14,901,824
[java.lang.reflect.Constructor](mat://object/0x7003b5790)
[First 10 of 155,074
objects](mat://query/list_objects+0x7016ec160+0x7016ebf48+0x7016ec118+0x7016ebee8+0x7016ec0d0+0x7016ebe88+0x7016ec1a8+0x7016ebfb0+0x7016ec040+0x7016ebdb8)
155,074 11,165,328
[org.codehaus.groovy.util.SingleKeyHashMap](mat://object/0x7020bff18)
[First 10 of 465,196
objects](mat://query/list_objects+0x7016e8638+0x701747d58+0x701747be8+0x701747b20+0x701747cb0+0x701747f70+0x701747ec8+0x701747e20+0x7016ea3d8+0x70173c078)
465,196 11,164,704
[org.codehaus.groovy.util.ReferenceType$SoftRef](mat://object/0x7f6ac62e0)
[First 10 of 271,416
objects](mat://query/list_objects+0x7017471b8+0x701746998+0x701745d08+0x7017455e8+0x701717ee0+0x70170f2f8+0x70170f3c8+0x70170e038+0x70170d9a0+0x70170e108)
271,416 10,856,640
[byte[]](mat://object/0x70007c538)
[First 10 of 233,046
objects](mat://query/list_objects+0x70173d760+0x70173cf38+0x70173cdf8+0x7f6bcc960+0x7f6bc12d8+0x7f60d25f8+0x7f5afeb38+0x70173dc50+0x70173d968+0x70173d8e8)
233,046 9,635,384
[org.codehaus.groovy.util.ManagedReference](mat://object/0x7f6acf0d8)
[First 10 of 271,416
objects](mat://query/list_objects+0x7017471a0+0x701746980+0x701745cf0+0x7017455d0+0x701717ec8+0x70170f2e0+0x70170f3b0+0x70170e020+0x70170d988+0x70170e0f0)
271,416 6,513,984
[java.lang.String](mat://object/0x700063960)
[First 10 of 233,044
objects](mat://query/list_objects+0x70173d748+0x70173cf20+0x70173cde0+0x7f6bcc948+0x7f6bc12c0+0x7f60d25e0+0x7f5afeb20+0x70173dc38+0x70173d950+0x70173d8d0)
233,044 5,593,056
[java.util.HashMap](mat://object/0x7001674a0)
[First 10 of 116,316
objects](mat://query/list_objects+0x701717e10+0x70170d8d0+0x701747068+0x701746848+0x70170f220+0x70170e8b8+0x701704020+0x70170df28+0x701703ad8+0x701701cf8)
116,316 5,583,168
[org.codehaus.groovy.runtime.metaclass.MetaMethodIndex$Header](mat://object/0x7016ea8d8)
[First 10 of 155,063
objects](mat://query/list_objects+0x7016ea9b0+0x7016eaa30+0x7016ea9f0+0x7018a2ee8+0x7018a2fa8+0x7018a2f68+0x7018a2f28+0x702350480+0x702351b08+0x70234fd38)
155,063 4,962,016
[groovy.lang.MetaClassImpl](mat://object/0x7020bd4f0)
[First 10 of 38,766
objects](mat://query/list_objects+0x7016e8520+0x7018a1af8+0x70234d728+0x701fe6540+0x702403360+0x701ff8910+0x702200ef8+0x701f4f238+0x701f46d48+0x702280810)
38,766 4,341,792
[java.lang.Class[]](mat://object/0x7000f9c40)
[First 10 of 155,395
objects](mat://query/list_objects+0x7016f9a08+0x7016f9e70+0x7016f87c0+0x7016f77d8+0x7016f7730+0x7016f4f40+0x7016f4d50+0x7016f3e58+0x7016f3cf8+0x7016f3c50)
155,395 3,730,632
[org.codehaus.groovy.reflection.CachedField](mat://object/0x7020beb30)
[First 10 of 116,373
objects](mat://query/list_objects+0x70173f270+0x70173f250+0x70173f210+0x70173f1f0+0x70173f1d0+0x70173f1b0+0x70173f190+0x70173f170+0x70173f150+0x70173f130)
116,373 3,723,936
[org.codehaus.groovy.reflection.CachedConstructor](mat://object/0x7016eabf8)
[First 10 of 77,537
objects](mat://query/list_objects+0x7016ed078+0x7016ed058+0x7016ed038+0x7016ed098+0x7016ecff8+0x7016ecfd8+0x7016ed018+0x7018a3130+0x7018a3150+0x70234ce40)
77,537 3,101,480
[org.codehaus.groovy.reflection.CachedClass](mat://object/0x7f6ac5c88)
[First 10 of 38,781
objects](mat://query/list_objects+0x701717c38+0x70170d6f8+0x701746e90+0x701746670+0x70170f048+0x70170e6e0+0x701703e48+0x70170dd50+0x701703900+0x701701b20)
38,781 2,792,232
Total: 25 of 57 entries; 32 more
27,101,310 1,142,999,600
```
I'll keep the hprof file around. Even compressed its 470 meg or so. If
having that heap dump would be beneficial for tracking this down please ask. We
can figure out how to get the file to someone.
If I disable the JSR223 PreProcessor there is no memory / class growth - it
just runs with bad data.
### Steps to reproduce the problem
run a request with JSR223 preprocessor as described in actual behavior
### JMeter Version
5.6.3
### Java Version
jdk-22.0.1
### OS Version
ubuntu server
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