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
- 10% duplication:
- 51,360 cleaned lines of cleaned code (without empty lines, comments, and frequently duplicated constructs such as imports)
- 5,374 duplicated lines
- 7,968 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
src/main/core-impl (1%)
--> src/main/user-impl (<1%)
238
7 file pairs
details...
src/main/core-api (<1%)
--> src/main/core-impl (<1%)
103
2 file pairs
details...
src/main/protocol-impl (<1%)
--> src/main/user-impl (<1%)
56
5 file pairs
details...
| From Component --> To Component |
Duplicated Lines |
File Pairs | Details |
|---|---|---|---|
| src/main/core-impl (1%) --> src/main/user-impl (<1%) |
238 | 7 file pairs | details... |
| src/main/core-api (<1%) --> src/main/core-impl (<1%) |
103 | 2 file pairs | details... |
| src/main/protocol-impl (<1%) --> src/main/user-impl (<1%) |
56 | 5 file pairs | details... |
Longest Duplicates
The list of 20 longest duplicates.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 29 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc |  DatabaseMetaDataUsingInfoSchema.javaDatabaseMetaDataUsingInfoSchema.java |
666:702 (3%)957:992 (3%) | view |
| 24 | x 2 | src/main/core-api/java/com/mysql/cj/logsrc/main/core-api/java/com/mysql/cj/log | Jdk14Logger.javaStandardLogger.java |
98:221 (32%)105:228 (26%) | view |
| 22 | x 2 | src/main/protocol-impl/j...com/mysql/cj/protocol/asrc/main/protocol-impl/j...com/mysql/cj/protocol/a | MysqlBinaryValueDecoder.javaMysqlBinaryValueDecoder.java |
51:82 (14%)89:120 (14%) | view |
| 21 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbc/resultsrc/main/user-impl/java/com/mysql/cj/jdbc/result | ResultSetImpl.javaResultSetImpl.java |
1117:1146 (1%)1221:1250 (1%) | view |
| 21 | x 2 | src/main/core-api/java/com/mysql/cj/protocolsrc/main/core-api/java/com/mysql/cj/protocol | InternalTime.javaInternalTimestamp.java |
47:83 (60%)51:87 (52%) | view |
| 21 | x 2 | src/main/core-impl/java/com/mysql/cjsrc/main/core-impl/java/com/mysql/cj | ClientPreparedQueryBindings.javaClientPreparedQueryBindings.java |
650:676 (3%)752:778 (3%) | view |
| 20 | x 2 | src/main/user-impl/java/com/mysql/cj/xdevapisrc/main/user-impl/java/com/mysql/cj/xdevapi | DocResultBuilder.javaRowResultBuilder.java |
64:93 (64%)67:96 (55%) | view |
| 20 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | DatabaseMetaDataUsingInfoSchema.javaDatabaseMetaDataUsingInfoSchema.java |
357:380 (2%)435:458 (2%) | view |
| 18 | x 2 | src/main/user-impl/java/com/mysql/cj/xdevapisrc/main/user-impl/java/com/mysql/cj/xdevapi | StreamingDocResultBuilder.javaStreamingRowResultBuilder.java |
61:88 (60%)64:91 (56%) | view |
| 18 | x 2 | src/main/protocol-impl/j...com/mysql/cj/protocol/xsrc/main/protocol-impl/j...com/mysql/cj/protocol/x | XProtocolDecoder.javaXProtocolDecoder.java |
89:110 (9%)126:147 (9%) | view |
| 18 | x 2 | src/main/core-impl/java/com/mysql/cj/conf/urlsrc/main/core-impl/java/com/mysql/cj/conf/url | ReplicationConnectionUrl.javaReplicationDnsSrvConnectionUrl.java |
71:92 (30%)75:96 (25%) | view |
| 17 | x 2 | src/main/core-impl/java/com/mysql/cj/resultsrc/main/core-impl/java/com/mysql/cj/result | SqlTimestampValueFactory.javaSqlTimestampValueFactory.java |
143:166 (20%)173:196 (20%) | view |
| 17 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | DatabaseMetaDataUsingInfoSchema.javaDatabaseMetaDataUsingInfoSchema.java |
706:727 (2%)996:1017 (2%) | view |
| 16 | x 2 | src/main/protocol-impl/j...ql/cj/protocol/a/resultsrc/main/protocol-impl/j...ql/cj/protocol/a/result | BinaryBufferRow.javaTextBufferRow.java |
85:108 (11%)61:84 (30%) | view |
| 16 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | BlobFromLocator.javaBlobFromLocator.java |
294:324 (4%)362:392 (4%) | view |
| 16 | x 2 | src/main/core-api/java/com/mysql/cjsrc/main/core-api/java/com/mysql/cj | MysqlType.javaMysqlType.java |
722:737 (3%)767:782 (3%) | view |
| 15 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | DatabaseMetaData.javaDatabaseMetaData.java |
2548:2573 (<1%)2662:2687 (<1%) | view |
| 15 | x 2 | src/main/core-api/java/com/mysql/cjsrc/main/user-impl/java/com/mysql/cj/jdbc | ParseInfo.javaStatementImpl.java |
535:558 (5%)2032:2055 (1%) | view |
| 15 | x 2 | src/main/core-impl/java/com/mysql/cjsrc/main/core-impl/java/com/mysql/cj | ClientPreparedQueryBindings.javaServerPreparedQueryBindings.java |
160:180 (2%)197:218 (4%) | view |
| 14 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | DatabaseMetaData.javaDatabaseMetaData.java |
1335:1357 (<1%)4195:4217 (<1%) | view |
Duplicated Units
The list of top 20 duplicated units.
| Size | # | Folders | Files | Lines | Code |
|---|---|---|---|---|---|
| 22 | x 2 | src/main/core-impl/java/com/mysql/cj/resultsrc/main/core-impl/java/com/mysql/cj/result | SqlTimestampValueFactory.javaSqlTimestampValueFactory.java |
142:169 172:199 | view |
| 19 | x 2 | src/main/user-impl/java/com/mysql/cj/xdevapisrc/main/user-impl/java/com/mysql/cj/xdevapi | RowResultBuilder.javaDocResultBuilder.java |
71:94 68:91 | view |
| 19 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/core-api/java/com/mysql/cj | StatementImpl.javaParseInfo.java |
2032:2056 535:559 | view |
| 16 | x 2 | src/main/user-impl/java/com/mysql/cj/xdevapisrc/main/user-impl/java/com/mysql/cj/xdevapi | StreamingDocResultBuilder.javaStreamingRowResultBuilder.java |
66:86 69:89 | view |
| 16 | x 2 | src/main/core-impl/java/com/mysql/cj/conf/urlsrc/main/core-impl/java/com/mysql/cj/conf/url | LoadBalanceDnsSrvConnectionUrl.javaLoadBalanceConnectionUrl.java |
106:123 98:115 | view |
| 14 | x 2 | src/main/core-impl/java/com/mysql/cj/resultsrc/main/core-impl/java/com/mysql/cj/result | UtilCalendarValueFactory.javaUtilCalendarValueFactory.java |
113:128 131:146 | view |
| 13 | x 2 | src/main/user-impl/java/com/mysql/cj/xdevapisrc/main/user-impl/java/com/mysql/cj/xdevapi | FindStatementImpl.javaSelectStatementImpl.java |
106:119 95:108 | view |
| 13 | x 2 | src/main/user-impl/java/com/mysql/cj/xdevapisrc/main/user-impl/java/com/mysql/cj/xdevapi | FindStatementImpl.javaSelectStatementImpl.java |
127:140 116:129 | view |
| 13 | x 2 | src/main/core-impl/java/com/mysql/cj/conf/urlsrc/main/core-impl/java/com/mysql/cj/conf/url | XDevApiConnectionUrl.javaXDevApiDnsSrvConnectionUrl.java |
128:141 93:106 | view |
| 12 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbc/jmxsrc/main/user-impl/java/com/mysql/cj/jdbc/jmx | ReplicationGroupManager.javaLoadBalanceConnectionGroupManager.java |
46:59 50:63 | view |
| 12 | x 2 | src/main/core-api/java/com/mysql/cj/utilsrc/main/core-api/java/com/mysql/cj/util | TimeUtil.javaTimeUtil.java |
192:205 207:220 | view |
| 11 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | CallableStatementWrapper.javaCallableStatementWrapper.java |
80:91 1796:1807 | view |
| 11 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | CallableStatementWrapper.javaCallableStatementWrapper.java |
94:105 1810:1821 | view |
| 11 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | CallableStatementWrapper.javaCallableStatementWrapper.java |
500:511 1838:1849 | view |
| 11 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | CallableStatementWrapper.javaCallableStatementWrapper.java |
514:525 1852:1863 | view |
| 11 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | CallableStatementWrapper.javaCallableStatementWrapper.java |
528:539 1866:1877 | view |
| 11 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | CallableStatementWrapper.javaCallableStatementWrapper.java |
768:780 1588:1599 | view |
| 11 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | CallableStatementWrapper.javaCallableStatementWrapper.java |
783:794 1602:1613 | view |
| 11 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | CallableStatementWrapper.javaCallableStatementWrapper.java |
811:822 1908:1919 | view |
| 11 | x 2 | src/main/user-impl/java/com/mysql/cj/jdbcsrc/main/user-impl/java/com/mysql/cj/jdbc | CallableStatementWrapper.javaCallableStatementWrapper.java |
839:850 1616:1627 | view |