JJUG_CCC_2017_Spring2.pdf

test

1. © Works Applications Co.,Ltd. #ccc_f3 2017 May/20th, JJUG CCC 2017 Spring SpotBugs(FindBugs)ʹΑΔ େن໛ERPͷίʔυ඼࣭վળ 1
2. © Works Applications Co.,Ltd. #ccc_f3 Agenda ‣ ࣗݾ঺հ ‣ 2017೥5݄ݱࡏͷJava੩తղੳπʔϧػೳɾಈ޲ൺֱ ‣ େن໛ERPͷίʔυ඼๊࣭͕͑Δ໰୊ͱͦͷղܾ ‣ ։ൃ͍ͯ͠Δ૊৫ͱͦͷ੡඼ ‣ ߦ͍ͬͯΔ޻෉ͱࠓޙͷల๬ 2
3. © Works Applications Co.,Ltd. #ccc_f3 ͜ͷηογϣϯͰಘΒΕΔ΋ͷ ‣ େن໛։ൃʹͯӡ༻Մೳͳίʔυ඼࣭վળख๏ ‣ άϩʔόϧͰେن໛ͳJava։ൃʹ͓͍ͯඞਢͱͳΔ
 ʮίʔυ඼࣭ͷఈ্͛ʯͷ࣮ફతͳख๏ ‣ ࣾ಺FW΍ϥΠϒϥϦͷ࢖͍ํΛ޿ΊΔख๏ͱͯ͠
 ׆༻Ͱ͖Δ੩తղੳπʔϧϓϥάΠϯͷ։ൃख๏ 3
4. © Works Applications Co.,Ltd. #ccc_f3 ࣗݾ঺հ ✤ https://github.com/ KengoTODA/ ✤ ᷂ϫʔΫεΞϓϦέʔγϣϯζ
 ݚڀ։ൃΤϯδχΞ ✤ ߴߍੜͷͱ͖ʹήʔϜ࡞Γͨͯ͘
 HSP2ʹखΛग़͠ɺϑϦʔιϑτ ΢ΣΞ࡞Ոɺͦͯ͠R&Dʹ ✤ SpotBugsͷதͷਓ JVM Simulator Maven3 ebook 4
5. © Works Applications Co.,Ltd. #ccc_f3 1. 2017೥5݄ݱࡏͷ
 Java੩తղੳπʔϧػೳɾಈ޲ൺֱ 5
6. © Works Applications Co.,Ltd. #ccc_f3 ੩తղੳπʔϧͷྑ͍ͱ͜Ζ ✤ ࢖͍खʹܦݧ΍ਂ͍஌͕ࣝͳͯ͘΋ɺ ✤ ϨϏϡʔલ΍σϓϩΠલͳͲૣ͍ஈ֊Ͱɺ ✤ ໰୊ΛൃݟͰ͖Δ 6
7. © Works Applications Co.,Ltd. #ccc_f3 ൺֱର৅Java੩తղੳπʔϧ ‣ Checkstyle ‣ PMD ‣ FindBugs / SpotBugs ‣ Checker Framework ‣ Google error-prone 7
8. © Works Applications Co.,Ltd. #ccc_f3 Checkstyle ‣ ιʔείʔυղੳͳͷͰίϯύΠϧͳ͠Ͱ࣮ߦͰ͖Δ ‣ ଟ࠼ͳIDEɾϏϧυπʔϧʹରԠ ‣ ίʔσΟϯάن໿ͷ֬ೝ͕ओ໨త ‣ ϓϥάΠϯ࣮૷ʹඞཁͳ஌͕ࣝগͳ͍ ‣ http://checkstyle.sourceforge.net/ 8
9. © Works Applications Co.,Ltd. #ccc_f3 PMD ‣ ιʔείʔυղੳͳͷͰίϯύΠϧͳ͠Ͱ࣮ߦͰ͖Δ ‣ ଟ࠼ͳIDEɾϏϧυπʔϧͦͯ͠ݴޠʹରԠ ‣ CPDʢίϐϖݕग़ʣػೳ΋౥ࡌ ‣ ϓϥάΠϯ࣮૷͸ΘΓͱෳࡶ ‣ https://pmd.github.io/ 9
10. © Works Applications Co.,Ltd. #ccc_f3 FindBugs / SpotBugs ‣ όΠτίʔυղੳͳͷͰίʔυʹͳ͍৘ใʢ਌Ϋϥεɺ
 ґଘઌɺΞϊςʔγϣϯ౳ʣ΋CLASSPATH͔Βิ׬Ͱ͖Δ ‣ ଟ࠼ͳIDEɾϏϧυπʔϧʹରԠ ‣ ͠͹Β͘։ൃ͕ࢭ·͍ͬͯͨʢ3.0.1͸2೥ऑલͷϦϦʔεʣ ‣ ϓϥάΠϯ࣮૷ʹ͸JVM΍όΠτίʔυͷ஌͕ࣝ͋Δͱྑ͍ ‣ https://spotbugs.github.io/ 10
11. © Works Applications Co.,Ltd. #ccc_f3 ࢀߟɿJSR305Ξϊςʔγϣϯͷࠓ ‣ javax.annotation ύοέʔδʹؚ·ΕΔ
 ˏNonnull ΍ˏUntaintedͳͲͷΞϊςʔγϣϯ ‣ JSR305͕Dormantͱͳͬͨޙ΋FindBugs͕഑෍͍ͯͨ͠ ‣ SpotBugsʹΑΔϝϯςφϯε༧ఆແ͠ ‣ ܕύϥϝʔλʹ࢖͏͜ͱ΋Ͱ͖ͳ͍ͷͰ
 ࠓޙԺ΍͔ʹஔ͖׵͑ΒΕ͍ͯ͘ͷͰ͸ 11
12. © Works Applications Co.,Ltd. #ccc_f3 Checker Framework ‣ Java8ͷJSR 308 (Annotations on Java Types) Λར༻͢Δ ‣ ଟ࠼ͳIDEɾϏϧυπʔϧʹରԠ ‣ JDKʹؚ·ΕΔΫϥεͷৼΔ෣͍Λσʔλϕʔεʹ࣋ͭ ‣ https://checkerframework.org/ 12
13. © Works Applications Co.,Ltd. #ccc_f3 Google error-prone ‣ ίϯύΠϧ࣌ʹղੳ͢ΔͷͰίʔυʹͳ͍৘ใ΋र͍΍͍͢ ‣ ιʔείʔυͷࣗಈमਖ਼Λ౰ॳ͔Βҙ͍ࣝͯ͠Δʁ ‣ EclipseඇରԠʢcom.sun.* ύοέʔδʹґଘͷͨΊʣ ‣ ৭ʑϞμϯͰϓϥάΠϯ࣮૷΋͠΍͍͢ ‣ GoogleࣾһҎ֎͔ΒͷPR͸ʢ࣮੷ͱͯ͠ʣड͚෇͚ͯͳ͍ ‣ http://errorprone.info/ 13 Refs: http://dl.acm.org/citation.cfm?id=2486877
14. © Works Applications Co.,Ltd. #ccc_f3 ࠓ࢖͏ͳΒͲͷπʔϧʁ 14 ʘ Target Standard Rules Note Checkstyle 7.7 AST 152 checks ŠŖũƄŎƃŞƄن໿ PMD 5.6.1 AST 287 rules (PMD Java) ଟݴޠରԠ SpotBugs 3.1.0−RC1 Bytecode 453 patterns (+9 experimentals) plugin๛෋ Checker Fw 2.1.11 AST (Compiler֦ு) 19 checkers JSR308ରԠ error-prone v2.0.19 AST (Compiler֦ு) 145 patterns (+61 experimentals) কདྷʹظ଴
15. © Works Applications Co.,Ltd. #ccc_f3 ࠓ࢖͏ͳΒͲͷπʔϧʁ ‣ ͱʹ͔͘਺Λग़͍ͨ͠ ‣ SpotBugs + Checker Framework ‣ Type AnnotationΛ࢖͑͹SpotBugsʹݟ͚ͭΒΕͳ͍໰୊΋
 ᖰΓग़ͤΔՄೳੑ͕͋Δ ‣ ղੳʹ࣌ؒΛ͔͚ͨ͘ͳ͍ ‣ error-proneͰίϯύΠϧ࣌νΣοΫ ‣ PMDΛίϯύΠϥͱฒྻ࣮ߦ 15
16. © Works Applications Co.,Ltd. #ccc_f3 ࠓ࢖͏ͳΒͲͷπʔϧʁ ‣ JavaεΩϧͷߴ͍։ൃऀ͕ἧ͍ͬͯΔ ‣ Ξϊςʔγϣϯͷར༻Λଅਐ͠Checker FrameworkΛ׆༻͢Δ ‣ ఆظతͳSpotBugsͰࡉ͔͍໰୊΋ᖰΓग़͢ ‣ ։ൃऀͷJavaεΩϧʹ͹Β͖͕ͭ͋Δ ‣ CheckstyleͰ࠷௿ݶͷಡΈ΍͢͞Λ୲อ͢Δ ‣ CPDͰίϐϖʹܯࠂΛ͢Δʢઅ౓ͷ͋ΔίϐϖΛଅ͢ʣ ‣ ಈ࡞Λܰͨ͘͠PMD΍SpotBugsΛ͜·Ίʹճ͠࠷௿ݶͷϛεΛ๷͙ 16
17. © Works Applications Co.,Ltd. #ccc_f3 Agenda ‣ ࣗݾ঺հ ‣ 2017೥5݄ݱࡏͷJava੩తղੳπʔϧػೳɾಈ޲ൺֱ ‣ େن໛ERPͷίʔυ඼๊࣭͕͑Δ໰୊ͱͦͷղܾ ‣ ։ൃ͍ͯ͠Δ૊৫ͱͦͷ੡඼ ‣ ߦ͍ͬͯΔ޻෉ͱࠓޙͷల๬ 17
18. © Works Applications Co.,Ltd. #ccc_f3 2. େن໛ERPͷίʔυ඼࣭͕ ๊͑Δ໰୊ 18
19. © Works Applications Co.,Ltd. #ccc_f3 גࣜձࣾ ϫʔΫεΞϓϦέʔγϣϯζͱ͸ ✤ ERPύοέʔδͷ։ൃΛߦ͍ͬͯΔاۀ ✤ γϯΨϙʔϧɺதࠃɺΠϯυɺΞϝϦΧ౳ʹ΋ڌ఺ ✤ ίϯγϡʔϚΞϓϦͷΑ͏ͳϢʔβϏϦςΟͱ
 εϐʔυΛ࣋ͭERPʮHUEʢAI WorksʣʯΛ
 ։ൃɾఏڙ 19
20. © Works Applications Co.,Ltd. #ccc_f3 HUEͷ࣮૷ ✤ ୤RDB͢ΔͳͲ଎౓ʹͩ͜Θ͍ͬͯͯɺ ✤ MSA͠ͳ͍ͱࢮ͵ఔ౓ʹ͸ࢁ΄ͲαʔϏε͕͋Γɺ ✤ ಙౡʹݚڀॴ࡞ΔϨϕϧͰࣗવݴޠॲཧʹຊؾͰɺ ✤ 100msୡ੒ͷͨΊʹAWS LambdaΛಋೖ͢ΔͳͲ
 ৽͍͜͠ͱ΋৭ʑ΍͍ͬͯΔɻ 20
21. © Works Applications Co.,Ltd. #ccc_f3 HUEͷ࣮૷Λࢧ͑Δਓ ✤ ඇৗʹଟ࠼Ͱ௕ॴ΋ଟ͍ ✤ ౦ژɾେࡕɾνΣϯφΠɾ্ւɾγϯΨϙʔϧͳͲʹ
 ։ൃڌ఺͕෼ࢄ͍ͯ͠Δ ✤ ڭҭϨϕϧ΍ৗ͔ࣝΒͯ͠ҧ͏ ✤ ϑϩϯτΤϯυɺϑϨʔϜϫʔΫɺϞόΠϧɺػցֶशɺ
 όονɺ෼ࢄॲཧͱ͍༷ͬͨʑͳઐ໳Ո͕ڞଘ ✤ εΩϧͷͳ͍৽ਓ͕૿͑ଓ͚͍ͯΔঢ়ଶ 21
22. © Works Applications Co.,Ltd. #ccc_f3 HUEͷ࣮૷Λࢧ͑Δਓ ✤ ඇৗʹଟ࠼Ͱ௕ॴ΋ଟ͍ ✤ ౦ژɾେࡕɾνΣϯφΠɾ্ւɾγϯΨϙʔϧͳͲʹ
 ։ൃڌ఺͕෼ࢄ͍ͯ͠Δ ✤ ڭҭϨϕϧ΍ৗ͔ࣝΒͯ͠ҧ͏ ✤ ϑϩϯτΤϯυɺϑϨʔϜϫʔΫɺϞόΠϧɺػցֶशɺ
 όονɺ෼ࢄॲཧͱ͍༷ͬͨʑͳઐ໳Ո͕ڞଘ ✤ εΩϧͷͳ͍৽ਓ͕૿͑ଓ͚͍ͯΔঢ়ଶ 22 ໰ɿ ߴ଎ʹ૿͍͑ͯ͘ ։ൃऀͷΩϟονΞοϓΛ গͳ͍ίϛϡχέʔγϣϯͰ ͲͷΑ͏ʹॿ͚Δ͔ʁ
23. © Works Applications Co.,Ltd. #ccc_f3 ͳͥSpotBugs͔ ✤ ࣾ಺ͷਓࡐͱࢿ࢈ ✤ ಺෦࣮૷ʹ໌Δ͍ෳ਺ͷ։ൃऀ ✤ ϓϥάΠϯ࣮૷ܦݧͷ஝ੵ ✤ Eclipse࿈ܞ ✤ HUE͸EclipseΛඪ४IDEͱ͍ͯ͠Δ ✤ Java8αϙʔτ ✤ FindBugs 3.0.1͸Lambdaͷѻ͍ʹ
 ໰୊͕͋Δ 23
24. © Works Applications Co.,Ltd. #ccc_f3 Agenda ‣ ࣗݾ঺հ ‣ 2017೥5݄ݱࡏͷJava੩తղੳπʔϧػೳɾಈ޲ൺֱ ‣ େن໛ERPͷίʔυ඼๊࣭͕͑Δ໰୊ͱͦͷղܾ ‣ ։ൃ͍ͯ͠Δ૊৫ͱͦͷ੡඼ ‣ ߦ͍ͬͯΔ޻෉ͱࠓޙͷల๬ 24
25. © Works Applications Co.,Ltd. #ccc_f3 3. HUE͕ߦ͍ͬͯΔ޻෉ͱ ࠓޙͷల๬ 25
26. © Works Applications Co.,Ltd. #ccc_f3 աڈͷࣦഊ ✤ σϑΥϧτઃఆͷ··FindBugs΍CheckstyleΛ
 ϩʔΧϧϏϧυ΍ϓϨϚʔδϏϧυʹಋೖ͠ɺ
 ੜ࢈ੑΛେ͖͘Լ͛ͨ ✤ ϓϨϚʔδϏϧυ͕1͔͔࣌ؒۙͬͯ͘͠·ͬͨ ✤ mvn -Dfindbugs.skip ΍ <findbugs.skip>true
 </findbugs.skip> ͕౰ͨΓલʹͳͬͯ͠·ͬͨ 26
27. © Works Applications Co.,Ltd. #ccc_f3 աڈͷࣦഊ ✤ σϑΥϧτઃఆͷ··FindBugsΛEclipseʹಋೖ͠ɺ
 ੜ࢈ੑΛେ͖͘Լ͛ͨ ✤ ϫʔΫεϖʔεʹ10Λ௒͑ΔϓϩδΣΫτΛৗ࣌༻ ҙͯ͠։ൃ͢Δਓ͕ଟ͔ͬͨ ✤ Eclipse PluginʹύϑΥʔϚϯε্ͷ͕ܽؕ͋ͬͨ 27
28. © Works Applications Co.,Ltd. #ccc_f3 ͦ΋ͦ΋ɺ ✤ MSAΛ໨ࢦ͍ͯ͠Δͷʹ૊৫ԣஅͳղੳ͸ඞཁ͔ʁ ✤ ֤αʔϏε։ൃऀ͕޷͖ʹ΍Ε͹͍͍ͷͰ͸ʁ ✤ ࣏ࣗͰ͖Δ׆ಈΛ։ൃޮ཰Λ௿Լͤͯ͞·Ͱ
 ԣஅతʹ΍Δʁ 28
29. © Works Applications Co.,Ltd. #ccc_f3 MSAͰ૊৫ԣஅͳղੳ͸ඞཁ͔ʁ ✤ ඞཁ ✤ ੩తղੳ͸nice to haveͰ͸ͳ͘must to have ✤ ͦΕͧΕҟͳΔਓࡐɾ޻਺Λ͍࣋ͬͯΔͷͰ
 ׬શʹ࣏ࣗʹ೚ͤΔͱ͍࣮ͭࢪ͞ΕΔͷ͔ෆ໌ྎ ✤ ։ൃޮ཰ΛԼ͛ͳ͍ํ๏Λ୳͢ඞཁ͕͋Δ 29
30. © Works Applications Co.,Ltd. #ccc_f3 ༏ઌ౓ ໢ཏੑ ʢϝϦοτʣ ࣦഊΛ౿·͑ͯ ✤ ։ൃޮ཰ʹଥڠ͠ͳ͍ ✤ ۃྗ։ൃऀͷ೔ৗۀ຿Λ
 ϒϩοΫ͠ͳ͍ख๏Λ୳͢ ✤ ޮ཰௿ԼΛೲಘͤ͞ΒΕΔ
 Ձ஋Λग़͢ ✤ ͪΌΜͱத਎Λཧղͯ͠࢖͏ ✤ ݁ہ͸όονϓϩάϥϜͳͷͰ
 ׳Εͨख๏ͰϓϩϑΝΠϧՄೳ ։ൃޮ཰ ʢೲಘʣ 30
31. © Works Applications Co.,Ltd. #ccc_f3 ௐࠪɿͳͥFindBugs͸஗͍ͷ͔ʁ ✤ 10਺೥લͷৗࣝʹ΋ͱ͍࣮ͮͨ૷ ʢSpotBugs 3.1.0-RC1Ͱղফʣ ✤ MapΛ࢖ͬͨ String#intern() ૬౰ͷࣗલॲཧ ✤ ListΠϯελϯεΛ࢖͍·Θͨ͢Ίͷܭࢉॲཧ ✤ Eclipse GUIΛසൟʹߋ৽͗͢͠Δ ʢSpotBugs 3.1.0-RC2Ͱղফʣ ✤ ղੳର৅͕มΘΔͨͼʹUIΛߋ৽ ✤ γϯάϧεϨουʢίΞΛ࢖͍੾Εͳ͍ʣ 31
32. © Works Applications Co.,Ltd. #ccc_f3 ௐࠪɿ؀ڥมߋͰߴ଎ԽͰ͖Δʁ ✤ ΄΅Ͱ͖ͳ͍ ✤ FindBugs͸CPU bound͕ͩγϯάϧεϨουͳόον ✤ ෳ਺ίΞΛ৯͍੾͍ͬͯΔͷ͸JITίϯύΠϥͷεϨου
 ʢ-XX:CICompilerCountͰ૿ݮՄ͕ͩ଎౓ʹ΄΅د༩ͳ͠ʣ ✤ OOME΍GC stormΛى͜͞ͳ͍ఔ౓ͷϝϞϦΛ༩͑Ε͹
 ͋ͱ͸CPUίΞ૿΍ͯ͠΋ϝϞϦ૿΍ͯ͠΋มԽͳ͠ 32
33. © Works Applications Co.,Ltd. #ccc_f3 ௐࠪɿGuava v19.0ղੳͷϚΠΫϩϕϯν ʢ4 CPU coresʣ 33 128m 256m 512m 1g 2
 (Default) OOME 18.2s 18.0s 18.2s 3 OOME 19.2s 18.2s 18.0s 4 OOME 24.8s 24.7s 23.6s -XX:CICompilerCount -Xmx & -Xms refs: https://github.com/spotbugs/spotbugs/pull/128
34. © Works Applications Co.,Ltd. #ccc_f3 ௐࠪɿGuava v19.0ղੳͷϚΠΫϩϕϯν ʢ2 CPU coresʣ 34 2g Default 26.0s G1GC 28.7s G1GC + UseStringDeduplication 29.1s GCઃఆʢJava8ʣ -Xmx & -Xms refs: https://github.com/spotbugs/spotbugs/pull/128
35. © Works Applications Co.,Ltd. #ccc_f3 ௐࠪɿઃఆͰfindbugs-maven-pluginΛ ߴ଎Խ͢Δʹ͸ ✤ onlyAnalyzeͰର৅ΫϥεΛ࡟Γɺ
 visitorsͰར༻DetectorΛ࡟Δ͜ͱͰߴ଎ʹͳΔ ✤ ൃݟ͍ͨ͠όάʹ༏ઌ౓Λ͚ͭΔ͜ͱ͕؊ཁ ✤ ExcludeFilterͰର৅ϑΝΠϧΛ࡟ͬͯ΋଎͘ͳΒͳ͍ ✤ Filter͸ॲཧͷ݁Ռʹରͯ͠Өڹ͢ΔͨΊ 35
36. © Works Applications Co.,Ltd. #ccc_f3 Ҏ্Λ౿·͑ͯ 36
37. © Works Applications Co.,Ltd. #ccc_f3 ํ਑ ✤ ଎౓ॏࢹͷૈ͍ղੳͱɺ໢ཏੑॏࢹͷղੳΛ૊Έ߹Θ ͤΔ ✤ ϓϨϚʔδϏϧυͰ͸มߋ͞ΕͨΫϥε͚ͩΛղੳ ✤ र͍࿙ΕΔ໰୊͸೔࣍ͷղੳͰൃݟɾใࠂ 37
38. © Works Applications Co.,Ltd. #ccc_f3 ॏ͘໢ཏੑͷߴ͍ղੳʢ֓ཁʣ ✤ Jenkins + SonarQubeͰ։ൃ͕׆ൃͰͳ͍࣌ؒଳʹ࣮ࢪ ✤ ॏେͰͳ͍Ϩϕϧͷϧʔϧ΋ؚΊ࣮ͯࢪ ✤ ։ൃऀ͕͍ͭͰ΋ΞΫηεͰ͖ΔSonarQubeΛఏڙ ✤ Readme΍ϓϩδΣΫτҰཡϖʔδʹBadgeΛදࣔ͠
 ҰཡੑͱSonarQube΁ͷಋઢΛ֬อ 38
39. © Works Applications Co.,Ltd. #ccc_f3 ॏ͘໢ཏੑͷߴ͍ղੳʢ݁Ռʣ ✤ 50ͷϓϩδΣΫτ͔Β3,000ͷ໰୊Λݟ͚ͭɺ
 1ϲ݄Ͱ͏ͪ900Λղফͨ͠ ✤ String.format() ΍ logger.info() ͷϑΥʔϚοτҟৗ ✤ ϚϧνεϨουϓϩάϥϛϯάΞϯνύλʔϯ 39
40. © Works Applications Co.,Ltd. #ccc_f3 ૉૣ͘ૈ͍ղੳʢ֓ཁʣ ✤ ॏେͳ໰୊Λத৺ʹௐࠪ ✤ ಠࣗMavenϓϥάΠϯͰfindbugs-maven-pluginΛ ϥοϓ ✤ มߋ͞Εͨ.javaϑΝΠϧҰཡ͔Βߋ৽͞ΕͨՄೳੑ ͷ͋ΔclassϑΝΠϧͷҰཡΛSpotBugsʹ౉͢ 40
41. © Works Applications Co.,Ltd. #ccc_f3 ૉૣ͘ૈ͍ղੳʢ݁Ռʣ ✤ SpotBugsʹ͔͔Δ࣌ؒΛฏۉ93ˋ࡟ݮ ✤ େ͖ͳϦϙδτϦͰ΋1෼Ҏ಺ʹղੳΛऴ͑ΒΕΔ
 ✤ र͍͖Εͳ͍໰୊͸ඞͣग़Δ ✤ ྫɿˏNonNullΛΠϯλϑΣʔεʹ௥Ճͨ͠৔߹ 41
42. © Works Applications Co.,Ltd. #ccc_f3 ࠓޙͷల๬ ✤ ͞Βʹଟ͘ͷϦϙδτϦ΁ͷಋೖ ✤ Type AnnotationΛஈ֊తʹಋೖ͢Δ ✤ ٕज़ʹͩ͜ΘΓͷڧ͍ɺڞ௨Ϟδϡʔϧ։ൃऀʹ
 ڠྗΛґཔ͢Δ 42
43. © Works Applications Co.,Ltd. #ccc_f3 4. ࣾ಺FWࢧԉͷͨΊͷ SpotBugsϓϥάΠϯ࣮૷ํ๏ 43
44. © Works Applications Co.,Ltd. #ccc_f3 5. ·ͱΊ 44
45. © Works Applications Co.,Ltd. #ccc_f3 େن໛։ൃʹ͓͚Δίʔυ඼࣭վળ ✤ ϓϩδΣΫτͷ਺ͱن໛͕େ͖͍MSAͰ͸ӡ༻ͷ
 ೉౓্͕͕Δ ✤ ֤αʔϏε։ൃऀ͕੩తղੳπʔϧͷϝϦοτΛ
 ڗडͰ͖Δ؀ڥͷߏங͕ඞཁ 45
46. © Works Applications Co.,Ltd. #ccc_f3 େن໛։ൃʹ͓͚Δίʔυ඼࣭վળ ✤ FindBugs/SpotBugsͷΫηΛཧղ͢Ε͹
 େن໛։ൃͰ΋αΫαΫར༻Ͱ͖Δ ✤ ύϥϝʔλͷมߋͰ࣮ߦϧʔϧͱର৅ίʔυΛ
 ߜΓࠐΉɺࠩ෼ղੳͱόον࣮ߦΛ෼͚Δ 46
47. © Works Applications Co.,Ltd. #ccc_f3 େن໛։ൃʹ͓͚Δίʔυ඼࣭վળ ✤ SpotBugsϓϥάΠϯΛ։ൃ͢Ε͹ࣾ಺ϑϨʔϜϫʔΫ ݻ༗ͷ໰୊΋੩తղੳπʔϧͰൃݟͰ͖Δ ✤ ࣮૷ʹ͸ඞͣ͠΋JVM΍όΠτίʔυͷ஌ࣝ͸ඞཁ ͱ͠ͳ͍ 47
48. © Works Applications Co.,Ltd. #ccc_f3 6. ࠾༻৘ใ 48
49. © Works Applications Co.,Ltd. #ccc_f3 ੈքΛ໨ࢦ͢ΤϯδχΞΛ ืू͍ͯ͠·͢ 49
50. © Works Applications Co.,Ltd. #ccc_f3 ۩ମతͳ࿩Λฉ͖͍ͨํ΁ ✤ ൃදޙʹࢲʹฉ͖ʹདྷ͍ͯͩ͘͞ʂ ✤ CIɺMSAɺϚΠάϨʔγϣϯɺ։ൃϓϩηεɺ
 ଟڌ఺։ൃ͸ઐ໳ͳͷͰ৭ʑ͓࿩Ͱ͖·͢. ✤ ೔ຊۈ຿Ͱ͸ͳ͍ͷͰɺ೔ຊڌ఺ݻ༗ͷ࿩͸
 ͋·Γ౴͑ΒΕͳ͍͔΋͠Ε·ͤΜɻ 50
51. © Works Applications Co.,Ltd. #ccc_f3 Thank you! ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ 51
52. © Works Applications Co.,Ltd. #ccc_f3 7. ࢀߟࢿྉ 52
53. © Works Applications Co.,Ltd. #ccc_f3 ࢀߟ৘ใ ‣ ιʔείʔυͷ඼࣭޲্ͷͨΊͷޮՌతͰޮ཰తͳ
 ίʔυϨϏϡʔ ‣ https://www.slideshare.net/MoriharuOhzu/ ss-9224836 53
54. © Works Applications Co.,Ltd. #ccc_f3 ࢀߟ৘ใ ‣ ϥϜμࣜ΍ετϦʔϜ API ΍৽͍͠೔࣌ API ͚ͩ ͡Όͳ͍ʂ
 Java8 ͷλΠϓɾΞϊςʔγϣϯ͋ͷख͜ͷख ‣ http://waman.hatenablog.com/entry/ 2014/05/08/063959 54
55. © Works Applications Co.,Ltd. #ccc_f3 ࢀߟ৘ใ ‣ Type Annotation for Static Program Analysis ‣ https://www.slideshare.net/skrb/type-annotation- for-static-program-analysis 55
56. © Works Applications Co.,Ltd. #ccc_f3 ࢀߟ৘ใ ✤ G1: from garbage collector to waste management consultant ✤ https://blogs.oracle.com/java-platform-group/ g1%3a-from-garbage-collector-to-waste- management-consultant 56
57. © Works Applications Co.,Ltd. #ccc_f3 ࢀߟ৘ใ ✤ G1 GC ͓͞Β͍ͱ #jjug_ccc Ͱൃදͨ͠࿩ ✤ http://cco.hatenablog.jp/entry/ 2015/12/01/011223 57
58. © Works Applications Co.,Ltd. #ccc_f3 ࢀߟ৘ใ ✤ The Google FindBugs fixit ✤ http://dl.acm.org/citation.cfm?id=1831738 58