1400万ユーザーのWebサービスを 15年運用して考える、 Javaである理由

Transcript

1. ϑϦϡʔגࣜձࣾ
   ླ໦ਅੜ
   !NBTBP[Jʣ ສϢʔβʔͷ8FCαʔϏεΛ
   ೥ӡ༻ͯ͠ߟ͑Δɺ
 +BWBͰ͋Δཧ༝
2. w ϑϦϡʔגࣜձࣾ
   !ژ౎
   w ࣾձਓྺ΋+BWBྺ΋೥໨
   w +BWBͱ4QSJOHͰ
   z(*3-4Λ)"11:ʹz
   ͢Δ࢓ࣄΛ͍ͯ͠·͢
   w େֶ࣌୅͸1ZUIPOͰ8FCΞϓϦΛ։ൃ
   ޷͖ͳ΋ͷ
   ษڧձͷελοϑɺϊϕϧςΟͷൃ஫ɺ͓͍͍͓͠ञ
 ϔΞΧϥʔϒϦʔνɺ୐഑ͷ഑ૹঢ়گΛோΊΔ ླ໦
   ਅੜ !NBTBP[J !2 ʘ·͓͞
   Ͱ͢ʗ w w w
3. w ࠓ೔ͷΰʔϧ
   w ࿩ͷ͖͔͚ͬ
   w ฐࣾͷαʔϏεͱٕज़બ୒ͷ࿩
   w ೔ʑͷӡ༻͔ΒΈΔ+BWBͰ͋Δཧ༝
   w ʲ͓·͚ʳ+%,ͷҠߦͷ࿩
   w ݁࿦
   w ͓͠Βͤ ࠓ೔࿩͢͜ͱ !3 ੩͔ʙʹฉ͘ΑΓ΋
 ΘʔΘʔݴ͍ͳ͕Β
 ฉ͍ͯ΋Β͑Ε͹خ͍͠Ͱ͢ʂ
4. w ࠓ೔ͷΰʔϧ
   w ࿩ͷ͖͔͚ͬ
   w ฐࣾͷαʔϏεͱٕज़બ୒ͷ࿩
   w ೔ʑͷӡ༻͔ΒΈΔ+BWBͰ͋Δཧ༝
   w ʲ͓·͚ʳ+%,ͷҠߦͷ࿩
   w ݁࿦
   w ͓͠Βͤ ࠓ೔࿩͢͜ͱ !4 ʮ೥ӡ༻ͯ͠ʯͱ͍͍ͭͭ
 ೥ϲ݄͔͠ݟͯͳ͍ͷͰ
 ௐ΂ͨ৘ใ΋͋Γ·͢
5. ࠓ೔ͷΰʔϧ
6. !6 ʮ+BWB͕దͨ͠αʔϏεͱ͸Կ͔ʯ
   ΁ͷҰͭͷղΛݟ͚ͭΔ͜ͱ
7. ࿩ͷ͖͔͚ͬ
8. w 4DBMB͕େ޷͖ͳઌഐ͕+BWBΛॻ͍͍ͯͯ೔ʑۤͦ͠͏Ͱ͋Δ
   w पғͷ༑ਓ͕ʮ+BWB͸ઈରॻ͖ͨ͘ͳ͍ʯͳͲݴ͍ͬͯͯɺ
 ͳΜ͔ͩ൵͍͠
   w ͱ͸͍͑ࣗ෼΋+BWB͕͘͢͝޷͖ͱ͍͏Θ͚Ͱ͸ͳ͍
   w ྡͷνʔϜ͸αʔόʔαΠυ,PUMJOΛݕ౼͍ͯ͠ΔΑ͏ͩʁ
   w ผͷݴޠΛݕ౼ͨ͜͠ͱ͸͋ΔΒ͍͠ɹɹɹɹɹͳͲͳͲ ࿩ͷ͖͔͚ͬ !8
9. w 4DBMB͕େ޷͖ͳઌഐ͕೔ʑۤͦ͠͏Ͱ͋Δ
   w पғͷ༑ਓ͕ʮ+BWB͸ઈରॻ͖ͨ͘ͳ͍ʯͳͲݴ͍ͬͯͯɺͳΜ͔ͩ൵ ͍͠
   w ͱ͸͍͑ࣗ෼΋+BWB͕͘͢͝޷͖ͱ͍͏Θ͚Ͱ͸ͳ͍
   w ྡͷνʔϜ͸αʔόαΠυ,PUMJOΛݕ౼͍ͯ͠ΔΑ͏ͩʁ
   w ผͷݴޠΛݕ౼ͨ͜͠ͱ͸͋ΔΒ͍͠ ࿩ͷ͖͔͚ͬ !9 ͳΜͰ+BWBΛ࢖͍ͬͯΔΜͩΖ͏ʁ +BWB͕ద͍ͯ͠Δ΋ͷͬͯͳΜͩΖ͏ʁ ഑ଐ͞ΕͨϓϩμΫτ͕+BWB͔ͩͬͨΒ
 Ҏ֎ͷཧ༝͸ͳ͍ͷͩΖ͏͔ʁ
10. w 4DBMB͕େ޷͖ͳઌഐ͕೔ʑۤͦ͠͏Ͱ͋Δ
    w पғͷ༑ਓ͕ʮ+BWB͸ઈରॻ͖ͨ͘ͳ͍ʯͳͲݴ͍ͬͯͯɺͳΜ͔ͩ൵ ͍͠
    w ͱ͸͍͑ࣗ෼΋+BWB͕͘͢͝޷͖ͱ͍͏Θ͚Ͱ͸ͳ͍
    w ྡͷνʔϜ͸αʔόαΠυ,PUMJOΛݕ౼͍ͯ͠ΔΑ͏ͩʁ
    w ผͷݴޠΛݕ౼ͨ͜͠ͱ͸͋ΔΒ͍͠ ࿩ͷ͖͔͚ͬ !10 ⾠ܾͯ͠ϚαΧϦΛ౤͛ʹདྷͨͷͰ͸ͳ͍Ͱ͢
    ʮ࢖͏͔Βʹ͸ɺྑ͞Λ஌Γ͍ͨʯ
    Έͳ͞Μͷ+BWBΛબΜͩཧ༝΍
 +BWBͷ޷͖ͳͱ͜ΖͳͲ΋ͥͻฉ͖͍ͨͰ͢
11. ฐࣾͷαʔϏεͱ
 ٕज़બ୒ͷ࿩
12. w ϓϦըऔಘαʔϏε
 ϓϦϯτγʔϧػͰࡱӨͨ͠ը૾Λ
 εϚϗ΍Ψϥέʔʹμ΢ϯϩʔυ͢Δ
    w ϓϦըΛ࢖ͬͨ4/4
    w Խহ඼ͷϓϨθϯτ
    w ϓϦᝑମͷޱίϛ ฐࣾͷαʔϏε
    ϐΫτϦϯΫ !12
13. w தֶੜʙେֶੜͷ(*3-4͕λʔήοτ
 ˞(*3-4ʜࣗ෼Λ(*3-4ͱೝ͍ࣝͯ͠Δ͢΂ͯͷਓ
    w ձһ਺ສਓҎ্
    w ଔۀࣜɺϋϩ΢ΟϯɺΫϦεϚεͳͲʹ
 ΞΫηε͕૿͑Δ ฐࣾͷαʔϏε
    ϐΫτϦϯΫ !13
14. w ೥
    Ψϥέʔ޲͚αΠτΛϦϦʔε
 αʔόʔͷ࣮૷͸+BWB
    w ೥
    εϚϗ޲͚αΠτωΠςΟϒΞϓϦΛϦϦʔε
 αΠτΞϓϦͷαʔόʔ͸ͱ΋ʹ+BWB
 "OESPJEΞϓϦ΋+BWB
    w ೥ݱࡏ
    ʜ
    
 ਓͰӡ༻։ൃத ฐࣾͷαʔϏε
    ϐΫτϦϯΫ !14
15. w ೥
    Ψϥέʔ޲͚αΠτΛϦϦʔε
 αʔόʔͷ࣮૷͸+BWB
    w ೥
    εϚϗ޲͚αΠτωΠςΟϒΞϓϦΛϦϦʔε
 αΠτΞϓϦͷαʔόʔ͸ͱ΋ʹ+BWB
 "OESPJEΞϓϦ΋+BWB
    w ೥ݱࡏ
    ʜ
    
 ਓͰӡ༻։ൃத ฐࣾͷαʔϏε
    ϐΫτϦϯΫ !15 
 ࠓ΋มΘΒͣ+BWB+BWB͍ͯ͠Δʂ
16. ٕज़બ୒ͷ࿩
    +BWB !16 Ψϥέʔ޲͚αʔϏε͕+BWBͰ͋ͬͨཧ༝ ஌ݟ͕ઌ
    
    બ୒ࢶͷগͳ͞
17. w ʙ೥ࠒ
    +BWB͕ग़࢝Ίͨ࣌୅
 ιϑτ΢ΣΞ։ൃݚڀͷΑ͏ͳͱ͜Ζ
 +BWBͰԿ͔ࣄۀ͕Ͱ͖ͳ͍͔ͱ໛ࡧ
    ٕज़બ୒ͷ࿩ !17 Ψϥέʔ޲͚αʔϏε͕+BWBͰ͋ͬͨཧ༝ +BWBͰ
 Կ͔ʜ
18. ٕज़બ୒ͷ࿩ !18 Ψϥέʔ޲͚αʔϏε͕+BWBͰ͋ͬͨཧ༝ w ʙ೥ࠒ
    +BWB͕ग़࢝Ίͨ࣌୅
 +BWBͰԿ͔ࣄۀ͕Ͱ͖ͳ͍͔ͱ໛ࡧ
    w ௨৴ܥϛυϧ΢ΣΞ͕׬੒
19. ٕज़બ୒ͷ࿩ !19 Ψϥέʔ޲͚αʔϏε͕+BWBͰ͋ͬͨཧ༝ Τϯλϝ
 ͍ͨ͠ͳ w ΤϯλʔςΠϯϝϯτܥͷ͜ͱ΋͍ͨ͠ʂ
 ϓϦػͱΨϥέʔͷ௨৴ͱ͔Ͳ͏ͩΖ͏͔
20. ٕज़બ୒ͷ࿩ !20 Ψϥέʔ޲͚αʔϏε͕+BWBͰ͋ͬͨཧ༝ w ΤϯλʔςΠϯϝϯτܥͷ͜ͱ΋͍ͨ͠ʂ
    w ଞͷݴޠ΋ݕ౼ͯ͠Έͨˠબ୒ࢶ͕গͳ͍
    w "QBDIF
    5PNDBU
    Ͱͭ͘ΔΑ͏ͳ΋ͷ 1FSM
    "QBDIF "QBDIF
 5PNDBU +BWB
    
21. ٕज़બ୒ͷ࿩ !21 Ψϥέʔ޲͚αʔϏε͕+BWBͰ͋ͬͨཧ༝ w ΤϯλʔςΠϯϝϯτܥͷ͜ͱ΋͍ͨ͠ʂ
    w ଞͷݴޠ΋ݕ౼ͯ͠Έͨˠબ୒ࢶ͕গͳ͍
    w "QBDIF
    5PNDBU
    Ͱͭ͘ΔΑ͏ͳ΋ͷ
    w ࣾ಺ʹ+BWBͷ஌ݟ͕ཷ·͍ͬͯΔͳʜ 1FSM
    "QBDIF "QBDIF
 5PNDBU +BWB
    
22. ٕज़બ୒ͷ࿩ !22 Ψϥέʔ޲͚αʔϏε͕+BWBͰ͋ͬͨཧ༝ w ΤϯλʔςΠϯϝϯτܥͷ͜ͱ΋͍ͨ͠ʂ
    w ଞͷݴޠ΋ݕ౼ͯ͠Έͨˠબ୒ࢶ͕গͳ͍
    w "QBDIF
    5PNDBU
    Ͱͭ͘ΔΑ͏ͳ΋ͷ
    w ࣾ಺ʹ+BWBͷ஌ݟ͕ཷ·͍ͬͯΔͳʜ +BWB
     ஌ݟ͕ઌ
    
    બ୒ࢶͷগͳ͞
    Ͱ+BWBʹ
23. ٕज़બ୒ͷ࿩ !23 ҆ఆ
    ͱ
    લ਎αʔϏεɺ+7. εϚϗ޲͚αʔϏε͕+BWBʹͳͬͨཧ༝
24. w ʙ೥ͷϦϦʔεʹ޲͚ٕͯज़ݕ౼Λ͢Δ
 +BWBʹݶΒͣଞͷݴޠ΍ϑϨʔϜϫʔΫ΋ݕ౼
    w ֶशίετ͕Ͳͷ͘Β͍ͳͷ͔
    w ϑϨʔϜϫʔΫͷ҆ఆ౓߹͍ɹɹͳͲͳͲ ٕज़બ୒ͷ࿩ !24 εϚϗ޲͚αʔϏε͕+BWBʹͳͬͨཧ༝ 4 1MBZ +BWB ʜ 1)1 4DBMB
25. w ʙ೥ͷϦϦʔεʹ޲͚ٕͯज़ݕ౼Λ͢Δ
 +BWBʹݶΒͣଞͷݴޠ΍ϑϨʔϜϫʔΫ΋ݕ౼
    w ࣾ಺ࢿ࢈͸׆༻͍ͨ͠ͷͰ+7.ݴޠ͕ྑ͍
 Ψϥέʔ޲͚αʔϏεͰ։ൃͨ͠ϥΠϒϥϦͳͲ ٕज़બ୒ͷ࿩ !25 εϚϗ޲͚αʔϏε͕+BWBʹͳͬͨཧ༝ 4 1MBZ +BWB ʜ 1)1 4DBMB
26. w ʙ೥ͷϦϦʔεʹ޲͚ٕͯज़ݕ౼Λ͢Δ
 +BWBʹݶΒͣଞͷݴޠ΍ϑϨʔϜϫʔΫ΋ݕ౼
    w ࣾ಺ࢿ࢈͸׆༻͍ͨ͠ͷͰ+7.ݴޠ͕ྑ͍
 Ψϥέʔ޲͚αʔϏεͰ։ൃͨ͠ϥΠϒϥϦͳͲ
    w 1MBZͱ4DBMBͷ૊Έ߹Θ͕ͤ҆ఆ͍ͯ͠ͳ͍࣌ظ ٕज़બ୒ͷ࿩ !26 εϚϗ޲͚αʔϏε͕+BWBʹͳͬͨཧ༝ 4 1MBZ +BWB ʜ 1)1 4DBMB
27. w ʙ೥ͷϦϦʔεʹ޲͚ٕͯज़ݕ౼Λ͢Δ
 +BWBʹݶΒͣଞͷݴޠ΍ϑϨʔϜϫʔΫ΋ݕ౼
    w ࣾ಺ࢿ࢈͸׆༻͍ͨ͠ͷͰ+7.ݴޠ͕ྑ͍
 Ψϥέʔ޲͚αʔϏεͰ։ൃͨ͠ϥΠϒϥϦͳͲ
    w 1MBZͱ4DBMBͷ૊Έ߹Θ͕ͤ҆ఆ͍ͯ͠ͳ͍࣌ظ ٕज़બ୒ͷ࿩ !27 εϚϗ޲͚αʔϏε͕+BWBʹͳͬͨཧ༝ 4 1MBZ +BWB
     ʜ 1)1 4DBMB ҆ఆ
    ͱ
    લ਎αʔϏεɺ+7.
    Ͱ+BWBʹ
28. w ೥
    Ψϥέʔ޲͚αΠτΛϦϦʔε
 ஌ݟ͕ઌ
    
    બ୒ࢶͷগͳ͞
    ͔Β+BWBʹ
    w ೥
    εϚϗ޲͚αΠτωΠςΟϒΞϓϦΛϦϦʔε
 ҆ఆ
    ͱ
    લ਎αʔϏεɺ+7.
    ͔Β+BWBʹ ٕज़બ୒ͷ࿩
    ·ͱΊ !28 ݴޠ࢓༷Ͱ͸ͳ͍෦෼͕ओͳཧ༝
29. ೔ʑͷӡ༻͔ΒΈΔ
 +BWBͰ͋Δཧ༝
30. !30  ݴޠͷϢʔβʔ͕ଟ͍
     ੩తܕ෇͚ίϯύΠϥ͕ڧྗͰ͋Δ
     ྫ֎Λ໌֬ʹॲཧͰ͖Δ
31. !31  ݴޠͷϢʔβʔ͕ଟ͍
     ੩తܕ෇͚ίϯύΠϥ͕ڧྗͰ͋Δ
     ྫ֎Λ໌֬ʹॲཧͰ͖Δ
32. Ϣʔβʔ਺ͷগͳ͍ݴޠ΍ϑϨʔϜϫʔΫΛ࢖͍ͬͯͨࠒ
    w ࣅͨ͜ͱΛ͍ͯ͠Δਓ͕ډͳ͍
    w ຊ΋هࣄ΋͋Μ·Γͳ͍
    ࠔ͔ͬͯΒղܾ·Ͱ͕ԕ͔ͬͨ ݴޠͷϢʔβʔ͕ଟ͍
     !32 ͍ͬͺ͍ͭΒ͍
33. Ͱ΋+BWBͳΒ
    
    w ࣅͨ͜ͱΛ͍ͯ͠Δਓ͕୔ࢁډΔ
    w ຊ΋هࣄ΋୔ࢁ͋Δ
    ࠔͬͯ΋ௐ΂Ε͹ॿ͔Δ཰͕ߴ͍
    ٯʹ৘ใʹຒ΋Εͯ͠·͏͜ͱ΋͋Δ ݴޠͷϢʔβʔ͕ଟ͍
     !33 ͭΒ͘ͳ͍ʂ
34. ϝϯςφϯε͞Ε͍ͯΔ΋ͷ͕ଟ͘ɺ࢖͍ଓ͚ΒΕΔ҆৺͕͋Δ
    w ϥΠϒϥϦɺϑϨʔϜϫʔΫͳͲ
    w ࢖͏ਓ͕ډΔ͠ɺίϛοτ͢Δਓ͕͍Δ
    େن໛ͳαʔϏεͱͯ͠͸҆৺ͯ͠࢖͑Δ͜ͱ͕خ͍͠
    ⾠
    ར༻͢Δ͚ͩͰͳ͘ίϛοτ͍͖ͯ͠·͠ΐ͏ͱ͍͏࿩ ݴޠͷϢʔβʔ͕ଟ͍
     !34
35. ࣾ಺֎໰ΘͣਓతϦιʔε͕५୔Ͱ͋Δ
    w ଞ෦ॺͱਓΛߦ͖དྷͰ͖Δ
    w શ͘ҟͳΔ੡඼Λ࡞Δ෦ॺͱٕज़ަྲྀ͕Ͱ͖Δ
 ᝒମͷ૊ΈࠐΈιϑτ΢ΣΞͷνʔϜͳͲ
    w ࣾ֎Ͱ΋ਓΛݟ͚ͭ΍͍͢
    w ++6(
    $$$ͱ͔΋ָ͍͋ͬͯ͠☺
 ݴޠͷϢʔβʔ͕ଟ͍
     !35
36. !36  ݴޠͷϢʔβʔ͕ଟ͍
     ੩తܕ෇͚ίϯύΠϥ͕ڧྗͰ͋Δ
     ྫ֎Λ໌֬ʹॲཧͰ͖Δ
37. +BWB͸੩తܕ෇͚ݴޠ
 ɹɹɹίϯύΠϧ࣌ʹܕνΣοΫΛͯ͘͠ΕΔ
    ྫ͑͹ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !37
38. ϥΠϒϥϦଆͰ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !38 
 public interface VegetableService { /** * ݱࡏͷ०ͷ໺ࡊΛฦ͢ * @return */ Vegetable getInSeason(List<Vegetable> vegetables); }
39. ར༻ଆͰ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !39 
 public class KithenController { @Resource VegetableService vegetableService; @RequestMapping(path = "/recommend") public ModelAndView recommendMenu() { List<Vegetable> vegetables = refrigeratorService.findVegetables(); Vegetable vegetable = vegetableService.getInSeason(vegetables); //ฦ͖ͬͯͨ໺ࡊͰ͓͢͢ΊͷݙཱΛߟ͑Δ… return new ModelAndView("/reccomend.html"); } }
40. ར༻ଆͰ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !40 
 public class KithenController { @Resource VegetableService vegetableService; @RequestMapping(path = "/recommend") public ModelAndView recommendMenu() { List<Vegetable> vegetables = refrigeratorService.findVegetables(); Vegetable vegetable = vegetableService.getInSeason(vegetables); //ฦ͖ͬͯͨ໺ࡊͰ͓͢͢ΊͷݙཱΛߟ͑Δ… return new ModelAndView("/reccomend.html"); } } ०ͷ໺ࡊͬͯ
 Ұݸ͡Όͳ͍Αͳ
41. ϥΠϒϥϦଆͰ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !41 
 public interface VegetableService { /** * ݱࡏͷ०ͷ໺ࡊΛฦ͢ * @return */ List<Vegetable> getInSeason(List<Vegetable> vegetables); }
42. ར༻ଆͰ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !42 
 public class KithenController { @Resource VegetableService vegetableService; @RequestMapping(path = "/recommend") public ModelAndView recommendMenu() { List<Vegetable> stockVegetables = refrigeratorService.findVegetables(); List<Vegetable> vegetables = vegetableService.getInSeason(stockVegetables); //ฦ͖ͬͯͨ໺ࡊͰ͓͢͢ΊͷݙཱΛߟ͑Δ… return new ModelAndView("/reccomend.html"); } }
43. ར༻ଆͰ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !43 
 public class KithenController { @Resource VegetableService vegetableService; @RequestMapping(path = "/recommend") public ModelAndView recommendMenu() { List<Vegetable> stockVegetables = refrigeratorService.findVegetables(); List<Vegetable> vegetables = vegetableService.getInSeason(stockVegetables); //ฦ͖ͬͯͨ໺ࡊͰ͓͢͢ΊͷݙཱΛߟ͑Δ… return new ModelAndView("/reccomend.html"); } }  ίϯύΠϧ
 Τϥʔ
44. ಉ͘͡ར༻ଆͰ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !44 public class ShoppingController { @Resource VegetableService vegetableService; @RequestMapping(path = "/market") public ModelAndView market() { List<Vegetable> vegetables = specialPriceService.findVegetables(); Vegetable vegetable = vegetableService.getInSeason(vegetables); //ฦ͖ͬͯͨ०ͷ໺ࡊΛͲ΍͜΍… return new ModelAndView("/market.html"); } } ͸Θʔ͍͢·ͤΜ
 ͦͬͪ΋࢖ͬͯͨ
45. ʮ͍΍͍΍ͦΕ͸ͳ͍ʯʮͦΜͳ͠ΐͬͺ͍ϛεʜʯ
 ʮͦ΋ͦ΋ͦΜͳमਖ਼ͷ࢓ํʜʯ
 ͱࢥ͍·͕͢
    w ٸ͍Ͱमਖ਼͍ͯ͠Δͱ͖
    w σʔλΞΫηε૚ʙϓϨθϯςʔγϣϯ૚·ͰҰؾʹ͔͍͍ͯΔͱ͖
    w ϥΠϒϥϦ΋·ͱΊͯॻ͍ͯΔͱ͖
    ͳͲɺҊ֎΍ͬͯ͠·͏ɻ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !45
46. ʜઌఔͷίʔυΛϦϦʔε͔ͯ͠Βϲ݄ޙʜ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !46
47. ϥΠϒϥϦଆͰ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !47 
 public interface VegetableService { /** * ݱࡏͷ०ͷ໺ࡊΛฦ͢ * @return */ List<Vegetable> getInSeason(List<Vegetable> vegetables); }
48. ϥΠϒϥϦଆͰ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !48 
 public interface VegetableService { /** * ݱࡏͷ०ͷ໺ࡊΛฦ͢ * @return */ List<Vegetable> getInSeason(List<Vegetable> vegetables) throws NoVegetablesException; } ۭͳΒ
 ྫ֎ʹͨ͘͠
 ͳ͖ͬͯͨ
49. ར༻ଆͰ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !49 
 List<Vegetable> vegetables = vegetableService.getInSeason(stockVegetables); 
 try { List<Vegetable> vegetables = vegetableService.getInSeason(stockVegetables); } catch (NoVegetablesException e) { e.printStackTrace(); } ,JUDIFO$POUSPMMFSͱ 4IPQQJOH$POUSPMMFSͰ
 ࢖͚ͬͯͨͬͳʙ
50. ར༻ଆͰ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !50 
 List<Vegetable> vegetables = vegetableService.getInSeason(stockVegetables); 
 try { List<Vegetable> vegetables = vegetableService.getInSeason(stockVegetables); } catch (NoVegetablesException e) { e.printStackTrace(); }  ίϯύΠϧ
 Τϥʔ
51. ػೳ௥Ճ͞Ε͍ͯͨʂ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !51 public class FlyerController { @Resource VegetableService vegetableService; @RequestMapping(path = "/available") public ModelAndView availableFlyerView() { List<Vegetable> vegetables = specialPriceService.findVegetables(); Vegetable vegetable = vegetableService.getInSeason(vegetables); //ฦ͖ͬͯͨ०ͷ໺ࡊΛͲ΍͜΍… return new ModelAndView(“/available.html"); } } Θʔ͓
 ͦͬͪ΋࢖ͬͯͨ
52. ͪ͜Β΋ʮͦΜͳ͜ͱ͋Δʁʯͱࢥ͏͔΋͠Ε·ͤΜ͕
    w େ͖ͳ࣮૷ ϲ݄Ҏ্͔͔ΔͳͲ Λ͍ͯ͠Δͱ͖
    w ಉ͡ϓϩμΫτʹରͯͦ͠Μͳ࣮૷͕ฒߦͰ૸Δঢ়گͷͱ͖
    ͳͲ΍͸Γ΍ͬͯ͠·͏৔໘͕͋Δɻ ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !52
53. ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗ !53 ࡉ͔͍ϛε͸ಈ͔͢લʹؾ͚ͮΔ΄͏͕
 Ұͭͣͭண࣮ʹ࣮૷ΛਐΊΒΕΔͷͰ
 ॻ͖͸͡Ί͔Β׬ྃ·Ͱ͕ૣ͍
    ͱ͸͍͑*%&͕ݡ͘ར༻ՕॴΛ୳ͤͨΓ͢ΔͷͰ
 ίϯύΠϥΛ௨ͣ͞ͱ΋ؾ͚ͮΔͱ΋͍͏
54. !54  ݴޠͷϢʔβʔ͕ଟ͍
     ੩తܕ෇͚ίϯύΠϥ͕ڧྗͰ͋Δ
     ྫ֎Λ໌֬ʹॲཧͰ͖Δ
55. Ϣʔβʔ͕ສਓ͍Δͱʮكͳҟৗܥʯׂ͕ͱΑ͘ൃੜ͢Δ
    ྫ֎Λ໌֬ʹॲཧͰ͖Δ !55 //΄΅ى͜Γ͑ͳ͍͕… if(hoge.isEmpty()) { return new Collections.emptyList(); }
56. Ϣʔβʔ͕ສਓ͍Δͱʮكͳҟৗܥʯׂ͕ͱΑ͘ൃੜ͢Δ
    w ࣮૷࣌఺Ͱ͸ຊ౰ʹك͕ͩͬͨଞͷػೳ௥ՃͰى͖΍͘͢ͳͬͨ
    w ϦϦʔε͔ͯ͠Β݁ߏك͡Όͳ͍ͳͱൃ֮ɹͳͲͳͲ
    ྫ֎Λ໌֬ʹॲཧͰ͖Δ !56
57. Ϣʔβʔ͕ສਓ͍Δͱʮكͳҟৗܥʯׂ͕ͱΑ͘ൃੜ͢Δ
    ྫ֎Λ໌֬ʹॲཧͰ͖Δ !57 //΄΅ى͜Γ͑ͳ͍͕… if(hoge.isEmpty()) { return new Collections.emptyList(); } ى͜ΔΜ͔ʜ
58. Ϣʔβʔ͕ສਓ͍Δͱʮكͳҟৗܥʯׂ͕ͱΑ͘ൃੜ͢Δ
    
 ͜͏͍͏ಛघέʔεʹରͯ͠ɺ
 ࣗ෼͕ͨͪѻ͍΍͍͢ྫ֎Λఆٛͯ͠ॲཧΛଅͤΔͷ͸ར఺ ྫ֎Λ໌֬ʹॲཧͰ͖Δ !58 //΄΅ى͜Γ͑ͳ͍͕… if(hoge.isEmpty()) { return throw new HogeIsEmptyException(); } ྫ֎ʹͨͬͨ͠ ΄͏͕͍ͳ
59. !59  ݴޠͷϢʔβʔ͕ଟ͍
     ੩తܕ෇͚ίϯύΠϥ͕ڧྗͰ͋Δ
     ྫ֎Λ໌֬ʹॲཧͰ͖Δ
60. !60  ݴޠͷϢʔβʔ͕ଟ͍
     ੩తܕ෇͚ίϯύΠϥ͕ڧྗͰ͋Δ
     ྫ֎Λ໌֬ʹॲཧͰ͖Δ
     Ћ
61. ศརͳ΋ͷ͕୔ࢁ͋Γɺ։ൃεϐʔυ͕ૣ͍
    w *%&͕ڧྗ
 ϦϑΝΫλϦϯάҰͭͰ΋ݡ͍ػೳ͕උΘ͍ͬͯΔ΋ͷ͕͋Δ
 ิ׬͕ڧྗɺ$POWFSU5P,PUMJOͱ͔·Ͱ͋Δ
 ॻ͘εϐʔυ͕ૣ͘ͳΔ
    w ඪ४ϥΠϒϥϦ͕ॆ࣮͍ͯ͠Δ
 ϥΠϒϥϦΛ୳͕࣌ؒ͢ݮΔͷͰ࣮૷ʹूதͰ͖Δ ʲ Ћʳ
 ։ൃ؀ڥ͕ڧྗͳ࿩ !61
62. ศརͳ΋ͷ͕୔ࢁ͋Γɺ։ൃεϐʔυ͕ૣ͍
    ॳ৺ऀͰ΋ʮ·ͣಈ͘΋ͷʯ͕ग़དྷ্͕Δ·Ͱ͕ૣ͍
    w ࠔͬͨˠͰָ͖͍ͨ͠
    ͕ૣ͍
    w ࣗ৴ͱ͔Ϟνϕʔγϣϯʹ௚݁͢Δ ʲ Ћʳ
    ։ൃ؀ڥ͕ڧྗͳ࿩ !62
63. ʲ͓·͚ʳ
 +%,ͷҠߦͷ࿩
64. w ϐΫτϦϯΫͰ͸0SBDMF
    +%,
    Λ࢖͍ͬͯͨ +%,ͷҠߦ !64 0SBDMF
    +%,
    ʙ̇
65. w ϐΫτϦϯΫͰ͸0SBDMF
    +%,
    Λ࢖͍ͬͯͨ
    w 0SBDMFͷαϙʔτϙϦγʔ͕มΘͬͨ
 ࣮ӡ༻Ͱ࢖͑Δ+%,
    ͸೥݄·Ͱ
 Ҿ͖ଓ͖࢖͏ʹ͸ܖ໿͕ඞཁ
 ͦΕ΋೥ؒͰαϙʔτऴྃͷ༧ఆ
 +%,
    Ҏ߱΋ಉ͘͡ܖ໿͕ඞཁ
    w Կ͔͠ΒରԠΛ͠ͳͯ͘͸ͳΒͳ͍ঢ়گ +%,ͷҠߦ !65 αϙʔτ ऴΘΔΑʂ 
66. ߟ͑ΒΕΔબ୒ࢶ͸͍͔ͭ͘
    w 0SBDMF
    +%,
    Ͱܖ໿͢Δ
    w 0SBDMF
    +%,
    Ͱܖ໿͢Δ
    w ֤ࣾஂମͷ+%,ʹҠߦ͢Δ
    w ͍ͬͦଞͷݴޠʹͯ͠͠·͏ +%,ͷҠߦ !66
67. ߟ͑ΒΕΔબ୒ࢶ͸͍͔ͭ͘
    w 0SBDMF
    +%,
    Ͱܖ໿͢Δ
    w 0SBDMF
    +%,
    Ͱܖ໿͢Δ
    w ֤ࣾஂମͷ+%,ʹҠߦ͢Δ
    w ͍ͬͦଞͷݴޠʹͯ͠͠·͏ +%,ͷҠߦ !67 ͙͢ʹରԠ͢Δͷ͸೉͍͠ ͙͢ʹରԠ͢Δͷ͸೉͍͠ ͳ͔ͳ͔ͷֹۚʹͳΓͦ͏ʜ ͳ͔ͳ͔ͷֹۚʹͳΓͦ͏ʜ
68. w ͻͱ·ͣ"EPQU0QFO+%,
    ʹҠߦ͢Δ͜ͱʹ
    w खॱʹಛผͳ͜ͱ͸ͳ͍
    w ΞϓϦέʔγϣϯ͔Β"EPQU0QFO+%,
    Λࢀর͢ΔΑ͏ʹ͢Δ
    w ςετ؀ڥͰϏϧυɺϢχοτςετ͕௨Δ͔νΣοΫ
    w ϲ݄΄Ͳςεταʔόʔʹஔ͍ͯΞϓϦέʔγϣϯΛ৮Γ͓ͨ͢
    w όά౳Έ͋ͨΒͳ͚Ε͹ϦϦʔε +%,ͷҠߦ !68 ࠓίί
69. ࠓޙ
    w վΊͯͲͷ+%,ʹ͢Δͷ͔
    w +BWBͷόʔδϣϯ΋Ͳ͏͢Δͷ͔
    ͳͲΛݕ౼ͯ͠௥ͬͯରԠΛ͍ͯ͘͠༧ఆ
    +%,ͷҠߦ !69
70. ͱɺ͞Βͬͱ࿩͕͓ΘΓ·͕ͨ͠
    +%,ͷҠߦ !70
71. w ରԠ͢ΔதͰɺ+BWBࣗମʹର͢ΔࠔΓ͝ͱ͸ಛʹແ͔ͬͨ
    w ਓͰ೰·ͳͯ͘΋ɺੈքதͷਓͷҙݟ͕ಘΒΕΔ
    w 0SBDMFҎ֎ʹ΋+%,ͷఏڙऀ͕͍Δ
    w ݟ͔ͭͬͨ՝୊͸ࣾ಺ͷ໰୊͹͔Γ
    w ৽͍͠όʔδϣϯʹ͙͢ʹରԠͰ͖ͳ͍ঢ়گΞʔΩςΫνϟ +%,ͷҠߦ !71
72. ݁࿦
73.  ྺ࢙తܦҢ
 ࣾ಺ʹઌʹ஌ݟ͕͋ͬͨɺଞͷબ୒ࢶͷͳ͞
     ݴޠͷϢʔβʔ͕ଟ͍
     ੩తܕ෇͚ͰίϯύΠϥ͕ڧྗͰ͋Δ
     ྫ֎Λ໌֬ʹॲཧͰ͖Δ ϐΫτϦϯΫ͕+BWBͰ͋Δཧ༝ !73
74. !74 ʮ+BWB͕దͨ͠αʔϏεͱ͸Կ͔ʯ
75. !75 w Ϣʔβʔ਺͕ଟ͘ɺن໛͕େ͖͍αʔϏε
    w ίϛοτ͢Δϝϯόʔ͕มԽ͠΍͍͢ɺ
 ͍ͭ୭͕Ͳ͜Λ৮Δ͔ಡΊͳ͍αʔϏε
76. !76 w Ϣʔβʔ਺͕ଟ͘ɺن໛͕େ͖͍αʔϏε
    w ίϛοτ͢Δϝϯόʔ͕มԽ͠΍͍͢ɺ
 ͍ͭ୭͕Ͳ͜Λ৮Δ͔ಡΊͳ͍αʔϏε Έͳ͞Μͷ͝ҙݟ΋
 ͥͻฉ͖͍ͨͰ͢ʂ
77. !77 ϐΫτϦϯΫ͸+BWBͰΑ͔ͬͨʁ
78. !78 :&4
79. w ୭͕Ͳ͜Λ͍ͭ৮Δ͔Θ͔Βͳ͍ঢ়ଶ
 গͳ͘ͱ΋νʔϜ͸ίʔυΛ৮ΔڪΕ͕͋ΔϓϩμΫτ
 ͪΐͪ͜ΐ͜ଞ෦໳͔Βਓ͕དྷͨΓνʔϜฤ੒͕มΘͬͨΓ͢Δ
 ͳͷͰ
    w ੩తܕ෇͚Ͱ͋Δ͜ͱͰࣗ෼ͷ஌Βͳ͍ͱ͜Ζ΋ͳΔ΂҆͘શʹ͠΍͍͢
    w ଞ෦ॺ΋+BWBྺͷ͋Δਓ͕ଟ͍ͷͰߦ͖དྷ͠΍͍͢ ϐΫτϦϯΫ͕+BWBͰ͋Δཧ༝ !79
80. w Ϣʔβ਺͕ສਓ͍ΔͰ͔͍αʔϏεͰ͋Δ
 ίϯύΠϧஈ֊Ͱ͔ͬ͠ΓνΣοΫͨ͠΋ͷΛੈʹग़ͤΔͷ͸͍ͩ͡
 ϥΠϒϥϦͳͲ΋ϝϯς͞ΕͯΔ΋ͷ͕͔ͭ͑Δͷ͸خ͍͠
 ҆શͳαʔϏεΛఏڙ͠΍͍͢
    w ίʔυͷϘϦϡʔϜɺաڈͷࢿ࢈΋͔ͳΓͰ͔͍
 աڈͷࢿ࢈ͱ͍͏ҙຯͰ͸+7.ݴޠͰ͋Ε͹׆༻Ͱ͖Δ ϐΫτϦϯΫ͕+BWBͰ͋Δཧ༝ !80
81. ͓͠Βͤ
82. ͓஌Βͤͦͷ̍ !82 Ұॹʹಇ͘ϝϯόʔΛืूதͰ͢ɻ
    ΤϯδχΞืूதʂ
83. ͓஌Βͤͦͷ̍ !83 w ژ౎Ӻɹెา෼
    w ΧϯϑΝϨϯε͸ࣾඅͰʂ
 ަ௨අ॓ധඅࢀՃඅ͓څྉ
    ग़·͢
    w ࣾ಺Ͱͷษڧձ΋͍Ζ͍Ζ
    w ৄ͘͠͸ͪ͜Β ΤϯδχΞืूதʂ
84. ͓஌Βͤͦͷ !84 ژ౎%FW͔;͐
    w ژ౎Ӻલ
    ʙ
    w ςʔϚ͸৭ʑ
    w ίʔώʔɺ࠙਌ձ෇͖
    w ৄ͘͠͸DPOOQBTTͰʂ ษڧձ΍ͬͯΔͷͰདྷ͍ͯͩ͘͞ʂ
85. ͓஌Βͤͦͷ !85 ొஃऀ΋ืूதͰ͢ʂ
    $G1ग़͔ͨͬͨ͠3FKFDUͩͬͨ
 ࣗ෼͕Έͨηογϣϯ·ͱΊ
 ͳͲͳͲͳΜͰ΋͟͝Εʂ
86. ສϢʔβʔͷ8FCαʔϏεΛ
 ೥ӡ༻ͯ͠ߟ͑Δɺ+BWBͰ͋Δཧ༝
    ϑϦϡʔגࣜձࣾ
    ླ໦ਅੜ
    !NBTBP[Jʣ ͝ਗ਼ௌ͋Γ͕ͱ͏͍͟͝·ͨ͠ʂ