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1 NAIST-IS-MT
2 ( )
3 (OSS) (Log4j, Slf4j, Commons logging, Logback), NAIST-IS-MT , i
4 Analysis of Version Selecting on Open Source Software Library Keisuke Fujino Abstract The principle aim of this paper was to provide a reliable guideline for software developers who want to use the open source software library. They should not always use the latest versions. For example, quality is important in the large scale systems. In the previous study, most popular version is recommended based on the wisdom of the crowds. However, there is the example that many users downgrade after reporting bugs in the library which they are using. Therefore, the wisdom of crowds is not always reliable when they select library. In this paper, to provide a reliable guideline, I investigate the version selection through the case study of 4 Java logging libraries (Log4j, Slf4j, Commons logging, and Logback) from the initial release to plateau. From the results, users select different version in the soon after initial release, but many users will come to use same version after a certain time. Therefore, after version selection of users converged, the wisdom of crowds is available to select version. In addition, I clear the extreme trend version increases as soon as the bug fixing curve begins to converge. Keywords: Open Source Software, Software Library, Bug Fixing Curve, Software Reliability Growth Model, The Wisdom of Crowds Master s Thesis, Graduate School of Information Science, Nara Institute of Science and Technology, NAIST-IS-MT , March 13, ii
5 1. Keisuke Fujino, Akinori Ihara, Kiyoshi Honda, Hironori Washizaki, and Ken-ichi Matsumoto, Toward Monitoring Bugs-Fixing Process After the Releases in Open Source Software, In Proceedings of the 6th International Workshop on Empirical Software Engineering in Practice (IWESEP 2014), November OSS. 21 (FOSE2014) pp iii
6 Research Questions iv
7 v
8 1 POM.xml slf4j : log4j logback commons logging slf4j log4j logback commons logging B 31 vi
9 OSS 1 Google Chrome Mozilla Firefox OSS [1] OSS OSS [2] OSS [3] The Wisdom of Crowds [4] 1
10 4 Java Logging Framework slf4j, log4j, commons logging, logback Research Questions 1 2
11 Research Question RQ1: OSS RQ2:
12 OSS Java Java Community Process 1 Web GWT 2 Spring 3 Hibernate 4 HTML SSH [2] 1 OSS 2.2 OSS
13 [3] ( ) [5] Web / Web 5
14 3. Github OSS OSS Java MAVEN 5 MAVEN Project Object Model POM MAVEN POM 1 depedency dependency groupid : artfactid : version : 5 6
15 1 POM.xml groupid artfactid MAVEN Repository MAVEN Mileva [6] AKTARI AKTARI Mileva Mileva Mileva
16 1 Log4j Commons Logging Logback Slf4j MAVEN Popular Category Logging Framework 4 SLF4J API Module Apache Log4j Logback Classic module ApacheCommons Logging Apache Software Foundation Apache OSS 1999 Apache Log4j 2002 Apache Commons Logging Log4j SLF4J API Module Logback Classic module Log4j Apache Software Foundation Github OSS MAVEN
17 2 OSS POM Github 2 POM 2 log4j POM POM log4j log4j Ver1.0 Ver POM POM Ver Ver Ver POM Ver1.0 Ver Ver Ver1.0 Ver1.1 POM POM 9
18 :59 Github OSS 4 Logging Framework SLF4J API Module Apache Log4j Logback Classic Module Apache Commons Logging A 2 B 1 Logback 3 1 SLF4J API Module 3 A Ver Ver
19 Log4j Compiler Assisted Localization (CAL10N) 8 Open Service Gateway initiative (OSGi) 9 Ver B 2 Ver Ver Ver Ver % Apache Log4j 4 A Ver1.2.8 Ver Ver Ver Appender Ver B 2 Ver % Ver Ver Ver Logback Classic Module logback 3 5 A Ver Ver1.0.9 Ver1.1.2 Apache Commons Logging 6 A Ver1.0.4 Ver1.1 8 ResourceBundle Java 9 Java 11
20 Ver B Ver % Ver Ver1.1.3 Ver1.2 Ver1.1.1 Ver OSS [7] (IPA) OSS 5 OSS [8] Web OSS Web 12
21 3 slf4j : 13
22 4 log4j 14
23 5 logback 15
24 6 commons logging 16
25 4. Research Question 4.1 OSS [7] Mileva AKTARI [6] IPA [8] 4 OSS RQ1: OSS [9] OSS 17
26 7 Bugzilla 10 RedMine 11 Jira 12 BTS: Bug Tracking System BTS
27 4.3 [10] BTS Jira Jira Status RESOLVED CLOSED Resolution FIXED
28 2 1 Commons Year Slf4j Log4j Logback Logging Total
29 A ( B ) 80% % 50% 40% 50% 80% Slf4J API Module 8 A 21
30 2 Ver1.6.1 B 80% 1 Ver % Ver1.6.1 Ver1.6.4 Ver1.7.2 Ver1.7.5 Apache Log4 9 A 60% Ver B % Ver Ver Ver Logback Classic Module 10 A B Ver B 80% logback 3 Ver1.0.9 Ver
31 Apache Commons Logging % Commons Logging Status 11 A Ver1.0.4 ver1.1 Ver % B 80% Ver1.1.1 Ver1.1.1 B slf4j log4j commons logging OSS OSS (1) (2) slf4j log4j commons logging 3 (1) 3 23
32 [5] 24
33 8 slf4j 25
34 9 log4j 26
35 10 logback 27
36 11 commons logging 28
37 (SRGM:Software Reliability Growth Model) [11] NHPP:Non-Homogeneous Pois-son Process [12][13] [14] 29
38 [10] RQ2 RQ2: 5.2 slf4j log4j 3 2 B B ) B slf4j log4j B B B 3 B 2 5 B 100% 30
39 3 B slf4j 90 (106%) 96 (98%) 101 (103%) 102 (104%) 98 (100% log4j 799 (274%) 815 (265%) 932 (269%) 1053 (297%) 358 (100% B B log4j slf4j % (B ) B slf4j % log4j % B 12 B slf4j 90% log4j 274% B slf4j 96% 102% 100% log4j % B 3 slf4j log4j 3 6 B 5.4 slf4j log4j slf4j 12 31
40 % 8 B B B 98 log4j slf4j slf4j B slf4j S 9 2 log4j 32
41 High Impact Bug [15][16] High Impact Bug High Impact Bug OSS 33
42 5 log4j 5.3 B 34
43 7. 35
44
45 Department of Computer Science and Software Engineering at Concordia University Emad Shihab 4 37
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