This plugin provides advanced on-the-fly duplicated code inspections for IntelliJ IDEA (aka clone detection).
See plugin on JetBrains repository: link
Main features
- Supports detection of
- exact clones
- clones with renamed variables/types/etc.
- clones with gaps
- Can analyze industry-size projects (with millions lines of code)
- Works on-the-fly, right as you type
- Provides duplicated code comparison
- Supports both Java and Kotlin (with more languages on the way)
NB! The plugin requires an additional JVM memory of up to 500 Mb per 1
General usage instructions
Inspections
The plugin provides duplicated code inspection after the initial project indexing is complete: use Alt + Enter to see all duplicated fragments.
Settings
Use File | Settings to setup plugin.
NB! Changes to the settings may cause a full reindexing of the current project
Comparision with other tools
| Tool | Commercial | On-the-fly | Recall | Scalability |
|---|---|---|---|---|
| IntelliJ IDEA Ultimate (action) | yes | no | excellent | acceptable |
| IntelliJ IDEA Ultimate (inspection) | yes | yes | acceptable | excellent |
| IDEA clone plugin | no | yes | good | good |
Tested projects
The plugin has been used to analyze several popular Java projects.
| Project | Time | Memory | Clones found |
|---|---|---|---|
| JetBrains MPS | 220 s | 960 Mb | 8109 |
| Android Framework Base | 145 s | 666 Mb | 5055 |
| JetBrains IntelliJ IDEA | 221 s | 1279 Mb | 5178 |
| Apache Hadoop | 54 s | 400 Mb | 1753 |
| Spring Framework | 35 s | 284 Mb | 746 |
| Consulo | 86 s | 517 Mb | 2275 |
| Apache CloudStack | 44 s | 530 Mb | 2875 |
| Apache Camel | 31 s | 371 Mb | 1992 |
Time - time required to do the initial indexing
Memory - total memory used by IntelliJ IDEA after full project indexing
Parameters used
Configuration
CPU i5-760 lynfield (4 core, 2.8 Ghz)
JVM options:
-ea -Xms256m --Xmx4000m