Advanced Modular Development

Transcription

1 Advanced Modular Development Alan Bateman Alex Buckley Java Platform Group, Oracle September 2016 Copyright 2016, Oracle and/or its affiliates. All rights reserved.

2 Sessions Prepare for JDK 9 Introduction to Modular Development Advanced Modular Development Modules and Services Project Jigsaw: Under The Hood #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 2

3 Application Migration #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 3

4 Typical application JDK #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 4

5 Typical application java.base java.logging java.sql java.xml #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 5

6 Sample Scenario myapp.jar mylib.jar jackson-core jar jacksondatabind jar jacksonannotations jar java.base java.logging java.sql java.xml 6

7 Running my application $ java -cp \ lib/myapp.jar:\ lib/mylib.jar:\ lib/jackson-core jar:\ lib/jackson-databind jar:\ lib/jackson-annotations jar\ myapp.main 7

8 Migrating from the top down myapp mylib jackson-core jar jacksondatabind jar jacksonannotations jar java.base java.logging java.sql java.xml 8

9 Migrating from the top down myapp requires? myapp exports? mylib requires? mylib exports? #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 9

10 $ jdeps -s lib/myapp.jar lib/mylib.jar myapp.jar -> lib/jackson-core jar myapp.jar -> lib/jackson-databind jar myapp.jar -> mylib.jar myapp.jar -> java.base myapp.jar -> java.sql mylib.jar -> java.base 10

11 // src/mylib/-info.java mylib { requires java.base; exports com.myapp.lib.util to myapp; } 11

12 // src/myapp/-info.java myapp { requires mylib; requires java.base; requires java.sql;??? requires jackson.core?????? requires jackson.databind??? } 12

13 If only jackson-core jar jackson.core jacksondatabind jar jackson.databind jacksonannotations jar jackson.annotations 13

14 // src/myapp/-info.java myapp { requires mylib; requires java.base; requires java.sql; requires jackson.core; requires jackson.databind; } 14

15 myapp mylib jackson.core jackson.databind jackson.annotations java.base java.logging java.sql java.xml 15

16 Automatic s Real s No changes to someone else s file :-) Module name derived from file name Exports all its packages Requires all other s #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 16

17 myapp mylib jackson.databind jackson.core jackson.annotations java.base java.logging java.sql java.xml 17

18 myapp mylib jackson.databind import com.fasterxml.jackson.databind.objectmapper;... ObjectMapper mapper = new ObjectMapper(); MyValue value = mapper.readvalue("{\"name\":\"bob\", \"age\":13}", MyValue.class); 18

19 // src/myapp/-info.java weak myapp { requires mylib; requires java.base; requires java.sql; requires jackson.core; requires jackson.databind; } 19

20 myapp mylib jackson.databind jackson.core jackson.annotations java.base java.logging java.sql java.xml 20

21 21

22 $ javac ---path lib ---source-path src -d mods lib/jackson-core jar lib/jackson-databind jar lib/jackson-annotations jar src/myapp/-info.java src/myapp/... src/mylib/-info.java src/mylib/... $ jar --create --file mlib/mylib.jar -C mods/mylib. $ jar --create --file mlib/myapp.jar -C mods/myapp. \ --main-class myapp.main #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 22

23 $ java -cp \ lib/myapp.jar:\ lib/mylib.jar:\ lib/jackson-core jar:\ lib/jackson-databind jar:\ lib/jackson-annotations jar \ myapp.main $ java ---path mlib:lib m myapp 23

24 Library Migration #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 24

25 Sample Scenario myapp.jar mylib.jar jackson-core jar jacksondatabind jar jacksonannotations jar java.base java.logging java.sql java.xml 25

26 Migrating from the bottom up myapp.jar mylib.jar jackson.core jackson.databind jackson.annotations java.base java.logging java.sql java.xml 26

27 Migrating from the bottom jackson.core requires? jackson.core exports? jackson.databind requires? jackson.databind exports? jackson.annotations requires? jackson.annotations exports? #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 27

28 Requires? $ jdeps -s lib/jackson*.jar jackson-annotations jar -> java.base jackson-core jar -> java.base jackson-databind jar -> lib/jackson-annotations jar jackson-databind jar -> lib/jackson-core jar jackson-databind jar -> java.base jackson-databind jar -> java.sql jackson-databind jar -> java.xml #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 28

29 jackson.databind jackson.core java.sql jackson.annotations java.xml java.base 29

30 Creating the -info.java for each $ jdeps -gen--info src *.jar writing to src/jackson.annotations/-info.java writing to src/jackson.databind/-info.java writing to src/jackson.core/-info.java #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 30

31 // src/jackson.databind/-info.java jackson.databind { requires transitive jackson.annotations; requires transitive jackson.core; requires java.logging; requires transitive java.sql; requires transitive java.xml; exports com.fasterxml.jackson.databind; exports com.fasterxml.jackson.databind.annotation; exports com.fasterxml.jackson.databind.cfg; exports com.fasterxml.jackson.databind.deser; exports com.fasterxml.jackson.databind.deser.impl; exports com.fasterxml.jackson.databind.jsontype; exports com.fasterxml.jackson.databind.jsontype.impl; exports com.fasterxml.jackson.databind.; exports com.fasterxml.jackson.databind.node; exports com.fasterxml.jackson.databind.ser; exports com.fasterxml.jackson.databind.ser.impl; exports com.fasterxml.jackson.databind.ser.std; exports com.fasterxml.jackson.databind.type; exports com.fasterxml.jackson.databind.util; } 31

32 // src/jackson.databind/-info.java jackson.databind { requires transitive jackson.annotations; requires transitive jackson.core; requires java.logging; requires transitive java.sql; requires transitive java.xml; exports com.fasterxml.jackson.databind; exports com.fasterxml.jackson.databind.annotation; exports com.fasterxml.jackson.databind.cfg; exports com.fasterxml.jackson.databind.deser; exports com.fasterxml.jackson.databind.deser.impl; exports com.fasterxml.jackson.databind.jsontype; exports com.fasterxml.jackson.databind.jsontype.impl; exports com.fasterxml.jackson.databind.; exports com.fasterxml.jackson.databind.node; exports com.fasterxml.jackson.databind.ser; exports com.fasterxml.jackson.databind.ser.impl; exports com.fasterxml.jackson.databind.ser.std; exports com.fasterxml.jackson.databind.type; exports com.fasterxml.jackson.databind.util; } 32

33 src/jackson.core/-info.java src/jackson.core/... src/jackson.databind/-info.java src/jackson.databind/... src/jackson.annotations/-info.java src/jackson.annotations/... $ javac ---source-path src -d mods $(find src -name *.java ) 33

34 $ javac ---source-path src -d mods... $ jar --create --file mlib/jackson-core jar \ --version C mods/jackson.core. $ jar --create --file mlib/jackson-databind jar \ --version C mods/jackson.databind. $ jar --create --file mlib/jackson-annotations jar \ --version C mods/jackson.annotations. 34

35 myapp.jar mylib.jar jackson.databind jackson.core jackson.annotations java.base java.logging java.sql java.xml 35

36 $ java -cp \ lib/myapp.jar:\ lib/mylib.jar:\ lib/jackson-core jar:\ lib/jackson-databind jar:\ lib/jackson-annotations jar \ myapp.main 36

37 $ java -cp \ lib/myapp.jar:\ lib/mylib.jar:\ lib/jackson-core jar:\ lib/jackson-databind jar:\ lib/jackson-annotations jar \ myapp.main $ java ---path mlib \ --add-s jackson.databind \ -cp lib/myapp.jar:lib/mylib.jar myapp.main 37

38 Putting it all together #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 38

39 jackson.databind jackson.core jackson.annotations java.base java.logging java.sql java.xml 39

40 myapp mylib jackson.databind jackson.core jackson.annotations java.base java.logging java.sql java.xml 40

41 $ ls -1 mlib myapp.jar mylib.jar jackson-core jar jackson-databind jar jackson-annotations jar $ java ---path mlib -m myapp 41

42 Linking #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 42

43 $ jlink ---path $JDKMODS:mlib --add-s myapp \ --compress=2 --strip-debug -output myimage $ du -ks myimage myimage $ ls myimage/bin myapp java keytool $ myimage/bin/java --list-s myapp mylib jackson.annotations@2.6.2 jackson.core@2.6.2 jackson.databind@2.6.2 java.base@9 java.logging@9 java.sql@9 java.xml@9 43

44 $ myimage/bin/java -m myapp Greetings from myapp, here s some json! 44

45 $ myimage/bin/myapp Greetings from myapp, here s some json! 45

46 Summary Freedom to adopt s at your own pace Modularize your application before its libraries Modularize libraries independently Different kinds of s Explicit vs. automatic Strong vs. weak #JavaOne #Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 46

47 Go forth and modularize! 47

48 Other sessions, mostly this room Prepare for JDK 9: 2.30pm Introduction to Modular Development: 3pm Modules and Services: 11.00am, 2.30pm Project Jigsaw: Under The Hood: 4pm Project Jigsaw Hack Session: 8.30am #JavaOne Jigsaw Copyright 2016, Oracle and/or its affiliates. All rights reserved. 48

49 More Information OpenJDK Project Jigsaw Early Access Builds 49

50 Safe Harbor Statement The preceding is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions. The development, release, and timing of any features or functionality described for Oracle s products remains at the sole discretion of Oracle. Copyright 2016, Oracle and/or its affiliates. All rights reserved. 50

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