Places in code with 6 or more lines that are exactly the same.
Intro
- For duplication, we look at places in code where there are 6 or more lines of code that are exactly the same.
- Before duplication is calculated, the code is cleaned to remove empty lines, comments, and frequently duplicated constructs such as imports.
- You should aim at having as little as possible (<5%) of duplicated code as high-level of duplication can lead to maintenance difficulties, poor factoring, and logical contradictions.
- To learn more about duplications and techniques for eliminating duplication, Sokrates recommends the following resources:
- Avoid Repetition, MartinFlower.com (IEEE Software article)
- Refactoring duplicated code, sourcemaking.com
- Beck Design Rules, MartinFowler.com
- DRY (Don't Repeat Yourself) Principle, Wikipedia
- The Cut-and-Paste Programming Software Development Anti-Pattern, sourcemaking.com
- Code Smells / Duplicated Code, Jeff Atwood, codinghorror.com:
- "Duplicated code is the bane of software development. Stamp out duplication whenever possible. You should always be on the lookout for more subtle cases of near-duplication, too. Don't Repeat Yourself!"
- Reducing Coupling, MartinFlower.com (IEEE Software article):
- "There are several ways to describe coupling, but it boils down to this: If changing one module in a program requires changing another module, then coupling exists. ... Duplication always implies coupling, because changing one piece of duplicate code implies changing the other."
Duplication Overall
- 52% duplication:
- 5,921 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 3,092 duplicated lines
- 836 duplicates
Duplication per Extension
Duplication per Component (primary)
Duplication Between Components (50+ lines)
Open 3D force graph...
Show more details on duplication between components...
From Component
--> To Component
Duplicated
Lines
File Pairs
Details
aws-lightsail-disk/src (61%)
--> aws-lightsail-instance/src (38%)
874
29 file pairs
details...
aws-lightsail-bucket/src (44%)
--> aws-lightsail-loadbalancer/src (48%)
708
20 file pairs
details...
aws-lightsail-database/src (42%)
--> aws-lightsail-instance/src (25%)
580
20 file pairs
details...
aws-lightsail-bucket/src (36%)
--> aws-lightsail-database/src (42%)
579
17 file pairs
details...
aws-lightsail-database/src (42%)
--> aws-lightsail-loadbalancer/src (39%)
579
17 file pairs
details...
aws-lightsail-instance/src (25%)
--> aws-lightsail-loadbalancer/src (39%)
575
23 file pairs
details...
aws-lightsail-bucket/src (35%)
--> aws-lightsail-instance/src (25%)
575
23 file pairs
details...
aws-lightsail-database/src (34%)
--> aws-lightsail-disk/src (33%)
476
13 file pairs
details...
aws-lightsail-bucket/src (28%)
--> aws-lightsail-disk/src (32%)
465
13 file pairs
details...
aws-lightsail-disk/src (32%)
--> aws-lightsail-loadbalancer/src (31%)
465
13 file pairs
details...
aws-lightsail-loadbalancer/src (31%)
--> aws-lightsail-staticip/src (44%)
458
18 file pairs
details...
aws-lightsail-bucket/src (28%)
--> aws-lightsail-staticip/src (44%)
458
18 file pairs
details...
aws-lightsail-instance/src (18%)
--> aws-lightsail-staticip/src (40%)
410
16 file pairs
details...
aws-lightsail-loadbalancer/src (27%)
--> aws-lightsail-loadbalancertlscertificate/src (46%)
400
12 file pairs
details...
aws-lightsail-database/src (29%)
--> aws-lightsail-staticip/src (39%)
400
17 file pairs
details...
aws-lightsail-alarm/src (46%)
--> aws-lightsail-loadbalancer/src (27%)
398
13 file pairs
details...
aws-lightsail-alarm/src (46%)
--> aws-lightsail-loadbalancertlscertificate/src (45%)
392
11 file pairs
details...
aws-lightsail-bucket/src (24%)
--> aws-lightsail-loadbalancertlscertificate/src (44%)
386
12 file pairs
details...
aws-lightsail-database/src (27%)
--> aws-lightsail-loadbalancertlscertificate/src (44%)
382
12 file pairs
details...
aws-lightsail-alarm/src (44%)
--> aws-lightsail-database/src (27%)
376
13 file pairs
details...
aws-lightsail-alarm/src (44%)
--> aws-lightsail-bucket/src (23%)
376
13 file pairs
details...
aws-lightsail-loadbalancertlscertificate/src (41%)
--> aws-lightsail-staticip/src (35%)
358
14 file pairs
details...
aws-lightsail-alarm/src (41%)
--> aws-lightsail-staticip/src (34%)
356
14 file pairs
details...
aws-lightsail-alarm/src (39%)
--> aws-lightsail-instance/src (14%)
336
12 file pairs
details...
aws-lightsail-disk/src (22%)
--> aws-lightsail-staticip/src (32%)
326
10 file pairs
details...
aws-lightsail-instance/src (13%)
--> aws-lightsail-loadbalancertlscertificate/src (35%)
308
10 file pairs
details...
aws-lightsail-alarm/src (35%)
--> aws-lightsail-disk/src (21%)
306
9 file pairs
details...
aws-lightsail-disk/src (19%)
--> aws-lightsail-loadbalancertlscertificate/src (32%)
278
7 file pairs
details...
aws-lightsail-alarm (61%)
--> aws-lightsail-database (55%)
64
2 file pairs
details...
aws-lightsail-bucket (55%)
--> aws-lightsail-instance (50%)
64
2 file pairs
details...
aws-lightsail-alarm (61%)
--> aws-lightsail-loadbalancertlscertificate (60%)
64
2 file pairs
details...
aws-lightsail-database (55%)
--> aws-lightsail-loadbalancer (54%)
64
2 file pairs
details...
aws-lightsail-alarm (61%)
--> aws-lightsail-loadbalancer (54%)
64
2 file pairs
details...
aws-lightsail-loadbalancer (54%)
--> aws-lightsail-loadbalancertlscertificate (60%)
64
2 file pairs
details...
aws-lightsail-database (55%)
--> aws-lightsail-loadbalancertlscertificate (60%)
64
2 file pairs
details...
aws-lightsail-disk (53%)
--> aws-lightsail-instance (48%)
62
1 file pair
details...
aws-lightsail-instance (48%)
--> aws-lightsail-loadbalancer (52%)
62
2 file pairs
details...
aws-lightsail-alarm (59%)
--> aws-lightsail-instance (48%)
62
2 file pairs
details...
aws-lightsail-instance (48%)
--> aws-lightsail-loadbalancertlscertificate (58%)
62
2 file pairs
details...
aws-lightsail-bucket (53%)
--> aws-lightsail-loadbalancer (52%)
62
2 file pairs
details...
aws-lightsail-bucket (53%)
--> aws-lightsail-loadbalancertlscertificate (58%)
62
2 file pairs
details...
aws-lightsail-alarm (59%)
--> aws-lightsail-bucket (53%)
62
2 file pairs
details...
aws-lightsail-bucket (53%)
--> aws-lightsail-database (53%)
62
2 file pairs
details...
aws-lightsail-database (53%)
--> aws-lightsail-instance (48%)
62
2 file pairs
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| aws-lightsail-disk/src (61%) --> aws-lightsail-instance/src (38%) |
874 | 29 file pairs | details... |
| aws-lightsail-bucket/src (44%) --> aws-lightsail-loadbalancer/src (48%) |
708 | 20 file pairs | details... |
| aws-lightsail-database/src (42%) --> aws-lightsail-instance/src (25%) |
580 | 20 file pairs | details... |
| aws-lightsail-bucket/src (36%) --> aws-lightsail-database/src (42%) |
579 | 17 file pairs | details... |
| aws-lightsail-database/src (42%) --> aws-lightsail-loadbalancer/src (39%) |
579 | 17 file pairs | details... |
| aws-lightsail-instance/src (25%) --> aws-lightsail-loadbalancer/src (39%) |
575 | 23 file pairs | details... |
| aws-lightsail-bucket/src (35%) --> aws-lightsail-instance/src (25%) |
575 | 23 file pairs | details... |
| aws-lightsail-database/src (34%) --> aws-lightsail-disk/src (33%) |
476 | 13 file pairs | details... |
| aws-lightsail-bucket/src (28%) --> aws-lightsail-disk/src (32%) |
465 | 13 file pairs | details... |
| aws-lightsail-disk/src (32%) --> aws-lightsail-loadbalancer/src (31%) |
465 | 13 file pairs | details... |
| aws-lightsail-loadbalancer/src (31%) --> aws-lightsail-staticip/src (44%) |
458 | 18 file pairs | details... |
| aws-lightsail-bucket/src (28%) --> aws-lightsail-staticip/src (44%) |
458 | 18 file pairs | details... |
| aws-lightsail-instance/src (18%) --> aws-lightsail-staticip/src (40%) |
410 | 16 file pairs | details... |
| aws-lightsail-loadbalancer/src (27%) --> aws-lightsail-loadbalancertlscertificate/src (46%) |
400 | 12 file pairs | details... |
| aws-lightsail-database/src (29%) --> aws-lightsail-staticip/src (39%) |
400 | 17 file pairs | details... |
| aws-lightsail-alarm/src (46%) --> aws-lightsail-loadbalancer/src (27%) |
398 | 13 file pairs | details... |
| aws-lightsail-alarm/src (46%) --> aws-lightsail-loadbalancertlscertificate/src (45%) |
392 | 11 file pairs | details... |
| aws-lightsail-bucket/src (24%) --> aws-lightsail-loadbalancertlscertificate/src (44%) |
386 | 12 file pairs | details... |
| aws-lightsail-database/src (27%) --> aws-lightsail-loadbalancertlscertificate/src (44%) |
382 | 12 file pairs | details... |
| aws-lightsail-alarm/src (44%) --> aws-lightsail-database/src (27%) |
376 | 13 file pairs | details... |
| aws-lightsail-alarm/src (44%) --> aws-lightsail-bucket/src (23%) |
376 | 13 file pairs | details... |
| aws-lightsail-loadbalancertlscertificate/src (41%) --> aws-lightsail-staticip/src (35%) |
358 | 14 file pairs | details... |
| aws-lightsail-alarm/src (41%) --> aws-lightsail-staticip/src (34%) |
356 | 14 file pairs | details... |
| aws-lightsail-alarm/src (39%) --> aws-lightsail-instance/src (14%) |
336 | 12 file pairs | details... |
| aws-lightsail-disk/src (22%) --> aws-lightsail-staticip/src (32%) |
326 | 10 file pairs | details... |
| aws-lightsail-instance/src (13%) --> aws-lightsail-loadbalancertlscertificate/src (35%) |
308 | 10 file pairs | details... |
| aws-lightsail-alarm/src (35%) --> aws-lightsail-disk/src (21%) |
306 | 9 file pairs | details... |
| aws-lightsail-disk/src (19%) --> aws-lightsail-loadbalancertlscertificate/src (32%) |
278 | 7 file pairs | details... |
| aws-lightsail-alarm (61%) --> aws-lightsail-database (55%) |
64 | 2 file pairs | details... |
| aws-lightsail-bucket (55%) --> aws-lightsail-instance (50%) |
64 | 2 file pairs | details... |
| aws-lightsail-alarm (61%) --> aws-lightsail-loadbalancertlscertificate (60%) |
64 | 2 file pairs | details... |
| aws-lightsail-database (55%) --> aws-lightsail-loadbalancer (54%) |
64 | 2 file pairs | details... |
| aws-lightsail-alarm (61%) --> aws-lightsail-loadbalancer (54%) |
64 | 2 file pairs | details... |
| aws-lightsail-loadbalancer (54%) --> aws-lightsail-loadbalancertlscertificate (60%) |
64 | 2 file pairs | details... |
| aws-lightsail-database (55%) --> aws-lightsail-loadbalancertlscertificate (60%) |
64 | 2 file pairs | details... |
| aws-lightsail-disk (53%) --> aws-lightsail-instance (48%) |
62 | 1 file pair | details... |
| aws-lightsail-instance (48%) --> aws-lightsail-loadbalancer (52%) |
62 | 2 file pairs | details... |
| aws-lightsail-alarm (59%) --> aws-lightsail-instance (48%) |
62 | 2 file pairs | details... |
| aws-lightsail-instance (48%) --> aws-lightsail-loadbalancertlscertificate (58%) |
62 | 2 file pairs | details... |
| aws-lightsail-bucket (53%) --> aws-lightsail-loadbalancer (52%) |
62 | 2 file pairs | details... |
| aws-lightsail-bucket (53%) --> aws-lightsail-loadbalancertlscertificate (58%) |
62 | 2 file pairs | details... |
| aws-lightsail-alarm (59%) --> aws-lightsail-bucket (53%) |
62 | 2 file pairs | details... |
| aws-lightsail-bucket (53%) --> aws-lightsail-database (53%) |
62 | 2 file pairs | details... |
| aws-lightsail-database (53%) --> aws-lightsail-instance (48%) |
62 | 2 file pairs | details... |
Longest Duplicates
The list of 20 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 64 | x 2 | aws-lightsail-alarm/src/.../amazon/lightsail/alarmaws-lightsail-database/s...azon/lightsail/database |  BaseHandlerStd.javaBaseHandlerStd.java |
19:115 (100%)19:115 (100%) | view |
| 64 | x 2 | aws-lightsail-loadbalanc.../lightsail/loadbalanceraws-lightsail-loadbalanc...dbalancertlscertificate | BaseHandlerStd.javaBaseHandlerStd.java |
19:115 (100%)19:115 (100%) | view |
| 64 | x 2 | aws-lightsail-alarm/src/.../amazon/lightsail/alarmaws-lightsail-loadbalanc.../lightsail/loadbalancer | BaseHandlerStd.javaBaseHandlerStd.java |
19:115 (100%)19:115 (100%) | view |
| 64 | x 2 | aws-lightsail-disk/src/m...e/amazon/lightsail/diskaws-lightsail-instance/s...azon/lightsail/instance | BaseHandlerStd.javaBaseHandlerStd.java |
23:119 (100%)23:119 (100%) | view |
| 64 | x 2 | aws-lightsail-database/s...azon/lightsail/databaseaws-lightsail-loadbalanc...dbalancertlscertificate | BaseHandlerStd.javaBaseHandlerStd.java |
19:115 (100%)19:115 (100%) | view |
| 64 | x 2 | aws-lightsail-bucket/src...amazon/lightsail/bucketaws-lightsail-database/s...azon/lightsail/database | BaseHandlerStd.javaBaseHandlerStd.java |
19:115 (100%)19:115 (100%) | view |
| 64 | x 2 | aws-lightsail-alarm/src/.../amazon/lightsail/alarmaws-lightsail-bucket/src...amazon/lightsail/bucket | BaseHandlerStd.javaBaseHandlerStd.java |
19:115 (100%)19:115 (100%) | view |
| 64 | x 2 | aws-lightsail-bucket/src...amazon/lightsail/bucketaws-lightsail-loadbalanc...dbalancertlscertificate | BaseHandlerStd.javaBaseHandlerStd.java |
19:115 (100%)19:115 (100%) | view |
| 64 | x 2 | aws-lightsail-alarm/src/.../amazon/lightsail/alarmaws-lightsail-loadbalanc...dbalancertlscertificate | BaseHandlerStd.javaBaseHandlerStd.java |
19:115 (100%)19:115 (100%) | view |
| 64 | x 2 | aws-lightsail-bucket/src...amazon/lightsail/bucketaws-lightsail-loadbalanc.../lightsail/loadbalancer | BaseHandlerStd.javaBaseHandlerStd.java |
19:115 (100%)19:115 (100%) | view |
| 64 | x 2 | aws-lightsail-database/s...azon/lightsail/databaseaws-lightsail-loadbalanc.../lightsail/loadbalancer | BaseHandlerStd.javaBaseHandlerStd.java |
19:115 (100%)19:115 (100%) | view |
| 46 | x 2 | aws-lightsail-bucket/src...bucket/helpers/resourceaws-lightsail-loadbalanc...lancer/helpers/resource | Instance.javaInstance.java |
18:105 (100%)18:105 (100%) | view |
| 39 | x 2 | aws-lightsail-alarm/src/.../amazon/lightsail/alarmaws-lightsail-staticip/s...azon/lightsail/staticip | BaseHandlerStd.javaBaseHandlerStd.java |
70:115 (60%)71:116 (52%) | view |
| 39 | x 2 | aws-lightsail-loadbalanc...dbalancertlscertificateaws-lightsail-staticip/s...azon/lightsail/staticip | BaseHandlerStd.javaBaseHandlerStd.java |
70:115 (60%)71:116 (52%) | view |
| 39 | x 2 | aws-lightsail-loadbalanc.../lightsail/loadbalanceraws-lightsail-staticip/s...azon/lightsail/staticip | BaseHandlerStd.javaBaseHandlerStd.java |
70:115 (60%)71:116 (52%) | view |
| 39 | x 2 | aws-lightsail-bucket/src...amazon/lightsail/bucketaws-lightsail-staticip/s...azon/lightsail/staticip | BaseHandlerStd.javaBaseHandlerStd.java |
70:115 (60%)71:116 (52%) | view |
| 39 | x 2 | aws-lightsail-database/s...azon/lightsail/databaseaws-lightsail-staticip/s...azon/lightsail/staticip | BaseHandlerStd.javaBaseHandlerStd.java |
70:115 (60%)71:116 (52%) | view |
| 38 | x 2 | aws-lightsail-alarm/src/.../amazon/lightsail/alarmaws-lightsail-disk/src/m...e/amazon/lightsail/disk | BaseHandlerStd.javaBaseHandlerStd.java |
19:87 (59%)23:91 (59%) | view |
| 38 | x 2 | aws-lightsail-bucket/src...amazon/lightsail/bucketaws-lightsail-disk/src/m...e/amazon/lightsail/disk | BaseHandlerStd.javaBaseHandlerStd.java |
19:87 (59%)23:91 (59%) | view |
| 38 | x 2 | aws-lightsail-disk/src/m...e/amazon/lightsail/diskaws-lightsail-loadbalanc.../lightsail/loadbalancer | BaseHandlerStd.javaBaseHandlerStd.java |
23:91 (59%)19:87 (59%) | view |
Duplicated Units
The list of top 20 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 45 | x 5 | aws-lightsail-alarm/src/.../amazon/lightsail/alarmaws-lightsail-database/s...azon/lightsail/databaseaws-lightsail-loadbalanc.../lightsail/loadbalanceraws-lightsail-loadbalanc...dbalancertlscertificateaws-lightsail-bucket/src...amazon/lightsail/bucket | BaseHandlerStd.javaBaseHandlerStd.javaBaseHandlerStd.javaBaseHandlerStd.javaBaseHandlerStd.java |
49:116 49:116 49:116 49:116 49:116 | view |
| 45 | x 2 | aws-lightsail-instance/s...azon/lightsail/instanceaws-lightsail-disk/src/m...e/amazon/lightsail/disk | BaseHandlerStd.javaBaseHandlerStd.java |
53:120 53:120 | view |
| 18 | x 2 | aws-lightsail-instance/s...nstance/helpers/handleraws-lightsail-disk/src/m...il/disk/helpers/handler | AddOnsHandler.javaAddOnsHandler.java |
50:68 47:65 | view |
| 12 | x 2 | aws-lightsail-alarm/src/...l/alarm/helpers/handleraws-lightsail-alarm/src/...l/alarm/helpers/handler | AlarmHandler.javaAlarmHandler.java |
36:48 106:118 | view |
| 12 | x 2 | aws-lightsail-loadbalanc...alancer/helpers/handleraws-lightsail-loadbalanc...alancer/helpers/handler | LoadBalancerHandler.javaLoadBalancerHandler.java |
42:54 103:115 | view |
| 12 | x 2 | aws-lightsail-loadbalanc...ificate/helpers/handleraws-lightsail-loadbalanc...ificate/helpers/handler | LoadBalancerTlsCertificateHandler.javaLoadBalancerTlsCertificateHandler.java |
34:46 105:117 | view |
| 11 | x 2 | aws-lightsail-instance/s...stance/helpers/resourceaws-lightsail-disk/src/m...l/disk/helpers/resource | AddOns.javaAddOns.java |
146:162 151:167 | view |
| 11 | x 3 | aws-lightsail-instance/s...stance/helpers/resourceaws-lightsail-disk/src/m...l/disk/helpers/resourceaws-lightsail-database/s...tabase/helpers/resource | Instance.javaDisk.javaDatabase.java |
200:211 156:167 173:184 | view |
| 11 | x 2 | aws-lightsail-instance/s...azon/lightsail/instanceaws-lightsail-disk/src/m...e/amazon/lightsail/disk | Translator.javaTranslator.java |
175:189 127:141 | view |
| 10 | x 2 | aws-lightsail-instance/s...stance/helpers/resourceaws-lightsail-disk/src/m...l/disk/helpers/resource | AddOns.javaAddOns.java |
173:183 178:188 | view |
| 10 | x 2 | aws-lightsail-loadbalanc...lancer/helpers/resourceaws-lightsail-bucket/src...bucket/helpers/resource | LoadBalancer.javaBucket.java |
192:202 196:206 | view |
| 9 | x 5 | aws-lightsail-instance/s...stance/helpers/resourceaws-lightsail-disk/src/m...l/disk/helpers/resourceaws-lightsail-database/s...tabase/helpers/resourceaws-lightsail-loadbalanc...lancer/helpers/resourceaws-lightsail-bucket/src...bucket/helpers/resource | Tags.javaTags.javaTags.javaTags.javaTags.java |
63:72 58:67 59:68 59:68 59:68 | view |
| 8 | x 2 | aws-lightsail-alarm/src/.../amazon/lightsail/alarmaws-lightsail-alarm/src/.../amazon/lightsail/alarm | Translator.javaTranslator.java |
25:33 83:91 | view |
| 7 | x 2 | aws-lightsail-alarm/src/.../alarm/helpers/resourceaws-lightsail-alarm/src/.../alarm/helpers/resource | Alarm.javaAlarm.java |
27:34 37:44 | view |
| 7 | x 2 | aws-lightsail-instance/s...azon/lightsail/instanceaws-lightsail-disk/src/m...e/amazon/lightsail/disk | Translator.javaTranslator.java |
199:206 151:158 | view |
| 7 | x 2 | aws-lightsail-database/s...tabase/helpers/resourceaws-lightsail-database/s...tabase/helpers/resource | Database.javaDatabase.java |
88:95 97:104 | view |
| 7 | x 2 | aws-lightsail-loadbalanc...lancer/helpers/resourceaws-lightsail-bucket/src...bucket/helpers/resource | Instance.javaInstance.java |
33:40 33:40 | view |
| 7 | x 2 | aws-lightsail-bucket/src...bucket/helpers/resourceaws-lightsail-bucket/src...bucket/helpers/resource | Bucket.javaBucket.java |
142:149 151:158 | view |
| 6 | x 8 | aws-lightsail-alarm/src/...l/alarm/helpers/handleraws-lightsail-instance/s...nstance/helpers/handleraws-lightsail-disk/src/m...il/disk/helpers/handleraws-lightsail-database/s...atabase/helpers/handleraws-lightsail-loadbalanc...alancer/helpers/handleraws-lightsail-loadbalanc...ificate/helpers/handleraws-lightsail-staticip/s...taticip/helpers/handleraws-lightsail-bucket/src.../bucket/helpers/handler | ResourceHandler.javaResourceHandler.javaResourceHandler.javaResourceHandler.javaResourceHandler.javaResourceHandler.javaResourceHandler.javaResourceHandler.java |
28:35 28:35 28:35 28:35 28:35 28:35 28:35 28:35 | view |
| 6 | x 2 | aws-lightsail-loadbalanc...lancer/helpers/resourceaws-lightsail-bucket/src...bucket/helpers/resource | Instance.javaInstance.java |
47:53 47:53 | view |