Bueatiful JVM World

1. ჎ఁ࿌ ੭෧ၴ౅ ၦጄ ዾ ༘ ၰ௴ ྤ൑ఋဪ JVM ໞື
2014. 11
Darion Kim

2. ୾௴ ௛ૐ?
Darion Kim (଀጑ૺ)
ಀ࿝༺ඊቔൟ ࿨ૐ໴ ༘໐
พ
ၴᆼ ቛཅ(ቛጁၡ ཅ, God of
Integration)
hnki0104@me.com
https://www.facebook.com/
groups/serverside (၌ၦྤ๢)

3. ၦ බ໏൐ ක౷
Freshman࿝઎ ෡ᆺఁఋ.
(for YMS, JHJ)

4. ၦු JVM࿝ ఝጄ໏ ྤ
གྷ੿୾ གྷఁ࿌ ੭෧ၴ
ึ౹ၔ ࿥ૺଆხൢ …

5. ྾໵౵൝ఁఋ.
႗ఝ ࿌ഒ઎ ࿈ૺዻ
ხ ྨઔཀఁఋ.

6. ྤ൑ఋဪ JVM ໞື
ၕ ൢ୾ ย ა๗ਜ਼ ౗
໮ཀఁଆ?

7. ຫ೥౹ၔ JVMၕ ශ
ೡધ ࿈ૺዾଆဠ?

8. JVM
=
Java Virtual Machine

9. ૯ ఋၗิሽ௴ ඳჰ
ၿ ࿌ഒ઎ ࿈ૺዻధ
ೡૐဠ. ΢΢

10. ႔௴ ࿌಩઎ ࿈ૺዾ
ଆဠ?

11. ጮགྷ ይച૯ೱ
(Program) ၔ ྤໞဠ?

12. ይച૯ೱၕ ཇጌዻඓ
ይചໞ༺(Process)ਜ਼
ແໜ౛ఁఋ.

13. Ⴓధ ၴໞᎁ ໕඗ዻඓ?
ಀ༺ሙ(Disk)࿝ ၰ௴ ይച૯ೱ ኒၩ
(File)ၕ ཇጌዽఋ.
ይച૯ೱ ኒၩၦ ඈක൘(Memory) ႕
ႁ౗ඓ໏ ይചໞ༺ጷ ౗࿌ ይചໞ໏
(CPU)൐ ຫဧዽఋ.

14. ૯൜ၒച౅ ૯഍ยଆ
ဠ?
Disk
Program.exe Loading
CPU
Process
Memory

15. Process௴ Disk, File, Memory,
CPUဉ શഏ౗࿌ ၰ஫ဠ.
ૺ࿍ጄ౞ໞဠ.

16. JVM
=
Process
ၦೡધ ਜ਼ႜዽఋඓ

17. JVM౅ Process ᅧ೿
ཇጌዾ༘ ၰઔ஫ဠ.

18. ࿝ၦ~ ఋ౹ ྤགྷඓ
໏… ^^

19. java -cp ೡၦ๐೻൘ ඈၨሜ೭༺

20. Ⴓధ ၴໞᎁ ໕඗ዻඓ?
ಀ༺ሙ࿝ ၰ௴ java ይച૯ೱ࿝ ඈၨ
ሜ೭༺൐ ხႜዻ࿥ ཇጌዽఋ.
-cp စ໩ၕ ჎࿌ ೡၦ๐೻൘౅ ხႜዻ
࿥ ཇጌዽఋ.
ೡၦ๐೻൘௴ ಀആቔ൘, *.jar, *.zip ኒ
ၩ ႗ఝઠചၦఋ.

21. ૯൜ၒച౅ ૯഍ยଆ
Disk
ဠ?
java
Loading
CPU
JVM
Memory
Main.class
Main
Library
Library

22. JVM౅ Process ൬஫
ဠ.

23. ୵ଆხ ྤఁೡધ ዻ
གྷ௴ ึ౹ၔ ࿥ૺଆ
ხൢ …

24. ၴ~ ૯೻ඓ Ⴓధ ཉ౅
ၰ઎ ౹࿌ਜ਼ ยଆဠ?

25. JVM ྦᄠ࿝໏௴ ࿌
ಠၩ౹ၦ ข࿌ჲଆ
ဠ?

26. ૯೿ ဨ໓ Creatorဉ Class
ဉ Object, Instanceၡ ᅍ
ၦ൐ ྩྤ྽ ጁఁఋ.

27. Ⴓధ ၴໞᎁ ໕඗ዻඓ?
Creator = Ⴎම჎, ෡ച ࿥೻ึ ၮఁఋ.
Class(*.class)௴ Ⴎම჎ਜ਼ ൢ౷ ຄఝၮఁ
ఋ.
Class௴ Objectጷ ౛ఁఋ. = Instance
૯൥ၔ ຄఝ࿝ ແ඗എၕ ุ࿌பၒඓ ੮
ᅰਜ਼ ౛ఁఋ.

28. ૯൜ၒച౅ ૯഍ยଆ
ဠ?
Instance
Class Object
Creator

29. ၴ~ ఋགྷ Class, Object
൐ ૺ࿍ጄ჎ໞဠ.

30. ၦ႞ ႜ൥ച ྤ൑ఋ
ဪ JVM ໞືၒച ౹
࿌੣ఁఋ. ^^

31. ྤ൑ఋဪ JVM ໞື
ၕ ᆓື႕ၒച ૯഍
ฤఁఋ.

32. თဠዽ ઇၔ ༱઎
૯൝ఁఋ.

33. ႜጸዽ ૺ༜ ༺ኳၦ
พધ ཌྷၔ ึ౹ၔ ࿥
ૺଆხൢ …

34. ྤ൑ఋဪ JVM ໞື
Beautiful JVM World

35. ࿌ೡ! ྤඳઇ౅ ࿖
஫ဠ.

36. ྤఇఁఋ.
༝ၔ લཅ౹ၦ ၰཀ
ఁఋ.

37. JVM ໞື࿝௴ ੜၴ ધ၉
ၡ ࿦ዾ(Role)ၕ ਜ਼ხધ
ၰ௴ ੮ᅰਜ਼ ၰཀఁఋ.

38. ఋགྷ ዽ฀…
੮ᅰ௴ ੜၴ ધ၉ၡ ࿦
ዾ(Role)ၦ ၰཀఁఋ.

39. “ᅖႮ჎”ചཡ ຫ೥ၕ
ൢ౹഍ધ ጋఋඓ ຫ೥
ఖ઎ ൢ౹࿌྽ ዻઔ჊.

40. Ⴓధ ၴໞᎁ ໕඗ዻඓ?
ຫ೥ၕ ൢ౹഍ඓ ൽ൘, චቛ, ኖ, ఋ൘
ၡ ႜጸዽ ࿦ዾၕ ႜၡዽఋ.
ൽ൘ဉ චቛၦ ዻ୾ਜ਼ ྤఁඓ ຫ೥ၦ
ྤఁఋ.
ኖ઴ ఋ൘ਜ਼ ౞੭ਜ਼ ྤఁඓ ຫ೥ၦ ྤ
ఁఋ.

41. ૯൜ၒച౅ ໕඗ዻඓ?
ຫ೥ ૃම

42. ฀ဘ:
ဨ൘௴ OOP࿝໏ ຫ೥(੮ᅰ)ၕ
ຫ೥ఖხ ྨ઎ ແໜጁఁఋ.
ྦ૯೻ཊఁଆ?

43. ఋགྷ ༝ၔ લཅၕ
໴੭ጁఁఋ.

44. ሜ೭༺ചధ(Classloader)
Beautiful JVM World
Classloader

45. Ⴓధ ၴໞᎁ ໕඗ዻඓ?
ሜ೭༺ചధ(Classloader)
࿦ዾ : JVM ၮૐ࿝໏ ሜ೭༺౹ၕ ചಉ
ዽఋ.
JVM ໞືၡ ༘බၿ ࿦ዾ

46. ૯൜ၒച౅ ໕඗ዻඓ?
Beautiful JVM World
Class
Classloader
Class
Class
Class Class

47. ചಉౘ ሜ೭༺௴ ੮
ᅰጷ ౙ༘ ၰཀఁఋ.

48. Ⴓధ ၴໞᎁ ໕඗ዻඓ?
Car a = new Car();
Car : ሜ೭༺
a : ੮ᅰ

49. ૯൜ၒച౅ ໕඗ዻඓ?
Beautiful JVM World
Class
Classloader
Car
Class
Class Class
a

50. ੮ᅰ൐ ࿥೻੭ ແໜ
ዻඓ

51. Ⴓధ ၴໞᎁ ໕඗ዻඓ?
Car a = new Car();
Car b = new Car();
House c = new House();
Food d = new Food();

52. ૯൜ၒച౅ ໕඗ዻඓ
Beautiful JVM World
Class
Classloader
Car
Class
Food House
a
b
c
d

53. ੮ᅰਜ਼ ඳዽఝച ൣ
ၦ ແໜ౗ඓ ࿌಩઎
ౙଆဠ?

54. ૯൜ၒച౅ ໕඗ዻඓ
Beautiful JVM World
Class
Classloader
Car
Object
Class
Object
Food House
a
b
c
d
Object
Object
Object
Object
Object
Object
Object
Object Object
Object
Object
Object
Object
Object
Object

55. JVM ໞືၡ ੮ᅰ ෘ
౅ਜ਼ ႙႙ ைྤჵఁ
ఋ.

56. ૯೻ఋਜ਼ …

57. ၦഄ઎ ౗ఋਜ਼ …

58. OOME(OutOf MemoryError)

59. ዻხൢ ႜື႕ၨ ື
ጼ࿝໏௴ OOMEਜ਼ ෧
ແዻხ ྨཀఁఋ.

60. ဒ ૯೾ଆဠ?

61. ವ ዻ୾ၡ ༝ၔ લ
ཅၕ ໴੭ጁఁఋ.

62. Garbage Collector
Beautiful JVM World
Class
Classloader
Car
Object
Class
Object
Food House
a
b
c
d
Object
Object
Object
Object
Object
Object Object
Object
Object
Object
finalize
Object
Object
Object
finalize
finalize
finalize
finalize
finalize
finalize finalize

63. Ⴓధ ၴໞᎁ ໕඗ዻඓ?
Garbage Collection : ੮ᅰਜ਼ ధ ၦື ᅒ
Ⴎਜ਼ ࿖ఋધ ንถ(finalize)ౘ ઠဨ
Garbage Collector࿝ ၡጄ ጭᆖ౛ఁఋ.
ყ ੮ᅰ൐ JVM ໞື࿝໏ ໴ඔ གྷሥఁ
ఋ.

64. ૯൜ၒച౅ ໕඗ዻඓ?
Beautiful JVM World
Class
Classloader
Object
Class
Food House
d
Object
Object Object
Object
Object
Object
Object
Object
Object
Car finalized

65. WAS(Web Application Server)
=
JVM
ၦೣ ແੜၔ ጄพ໮୾ဠ?

66. ൬ཀఁఋ.
WAS౅J2EE ༺ኳၕ ა
༘ዽ JVMၮఁఋ.

67. ૯൜ၒച౅ ໕඗ዻඓ?
Beautiful JVM World
AServlet
Classloader
FoodServlet House.jsp
Car.jsp
a
b
c
d
BServlet

68. JVM ໞືၔ ጃື
ྤ൑ఖૺൢ ዾଆဠ?

69. ႗ఝ ྤఇఁఋ.

70. Ⴎම჎ဉ Ⴎම჎ၡ ᆵ
ૐึ౹ၔ ุ໷ዽ ሜ೭
༺൐ ൢ౹༘ၰཀఁఋ.

71. ළ౅ ක്ધ ൢ౷ ሜ
೭༺ਜ਼ ᆊધၡ ุ໷
ዽ ሜ೭༺ၮఁఋ.

72. ุ໷ዽ ሜ೭༺ၡ ၡጄ ແໜ
ౘ ੮ᅰ౹ၦ JVM ໞືၕ
෥౵གྷ ࿌ხഀ઎ ጁఁఋ.

73. ࿌಩઎ ጄછጄ྽ ዻ
୾ဠ?

74. ይചኒၩൟ(Profiling)
ၕ ጄ྽ጁఁఋ.

75. ይചኒၩൟၕ ዻ഍ඓ
ሜ೭༺ചధဉ ᆵጄႦ
྽ ጁఁఋ.

76. Ⴓధ ၴໞᎁ ໕඗ዻඓ?
ဨ൘௴ ሜ೭༺ചధၡ ࿦ዾၕ ྩધ ၰཀఁఋ.
ሜ೭༺ചధ࿝ Hook Class൐ ႕ဧጁఁఋ.
ይചኒၩൟ ఝື ሜ೭༺ਜ਼ ചಉౙ ಕ ஀ྤᅘ࿌ ᆬႜ
ചჯၕ ཉ࿌௉ཀఁఋ.
ይചኒၩ ᆬႜၕ ༘ጌጁఁఋ. (ex:ඈ໴౵ ༘ጌགྷ੝ ᆬ
ႜ)
ይചኒၩൟ ఝື ሜ೭༺௴ ၴཅ࿝ ච໵࿝ ཉ࿌௉ၔ
ചჯၕ ၨხዻხ ජዻધ ዀ໴ဉ ౏ၩዻ઎ ጺ౏ጁఁఋ.

77. Hooking Class

78. ૯൜ၒച౅ ໕඗ዻඓ?
Beautiful JVM World
AServlet
Classloader
FoodServlet House.jsp
Crazy.jsp
maddest-a
maddest-b
c
d
BServlet
hook Profiler

79. ุ໷ዽ ሜ೭༺࿝໏ ແ
ໜౘ ੮ᅰ௴ ጭጹ, ႖ႉ,
ൠൠพఋ౅ ඳ໙ཀఁఋ.

80. ၦ ྤ൑ఋဪ JVM ໞື࿝
Memory Leak, Infinite Loop
ၡ ྭໞዅ൐ ጸຮགྷሥఁఋ.

81. છ૑࿟ ྤ൑ఋဪ JVM ໞື
࿝ OutOfMemoryError,
Process of Hanging઴ ੪ၔ Ⴖ
൥ၕ ਜ਼Ⴆఋ ვఁఋ.

82. JVM Ⴖ൥…

83. ૯೭໏ ይചኒၩൟၒച ဴ
ၨ ሜ೭༺ ෟ ੮ᅰ൐ ᅗྤ
႞੿ጄ྽ ዻ௴ ઇၮఁఋ.

84. ᅗྤ໏ ෥౵གྷ
႞੿ዻೡ~!

85. ይചኒၩൟၦ ࿌഍
ါઇ ੪ၒགྷ჊?

86. APM (Application
Performance Management)
໸ള໩ၕ ૐ൯ዻ࿥ ຫဧዻ
གྷඓ ੝ఎጁఁఋ.

87. ඳഭച ዻཇ഍ඓ JDK࿝ ዅ
ጀౘ JConsoleၦ୾ VisualVM
ၕ ຫဧዻགྷඓ ౛ఁఋ.

88. Ⴓధ ችጷౘ ይചኒၩൟၕ
ဴዻགྷඓ Java
Instrumentation ૺฅၕ ຫဧ
ዻ࿥ ૐጢዻགྷඓ ౛ఁఋ.

89. ྤ൑ఋဪ JVMໞືၔ
ဨ൘ਜ਼ ෥౵གྷ ᆓૐጄ
྽ ౗௴ ໞືၮఁఋ.

90. ၦື ၌ၦྤ๢࿰ཀఁఋ.