Advanced Modular Development CON6821

Transcription

1 Advanced Modular Development CON6821 Mark Reinhold, Alex Buckley, Alan Bateman Java Platform Group, Oracle October 2015 Copyright 2015, Oracle and/or its affiliates. All rights reserved.

2 Sessions Prepare for JDK 9 Introduction to Modular Development Advanced Modular Development Project Jigsaw: Under the Hood Project Jigsaw Hack Session Copyright 2015, Oracle and/or its affiliates. All rights reserved. 2

3 Application Migration Copyright 2015, Oracle and/or its affiliates. All rights reserved. 3

4 Typical application JDK Copyright 2015, Oracle and/or its affiliates. All rights reserved. 4

5 Typical application java.base java.logging java.sql java.xml Copyright 2015, 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 Copyright 2015, Oracle and/or its affiliates. All rights reserved. 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 Copyright 2015, Oracle and/or its affiliates. All rights reserved. 7

8 Migrating from the top down myapp mylib jackson-core jar jacksondatabind jar jacksonannotations jar java.base java.logging java.sql java.xml Copyright 2015, Oracle and/or its affiliates. All rights reserved. 8

9 Migrating from the top down myapp requires? myapp exports? mylib requires? mylib exports? Copyright 2015, 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 Copyright 2015, Oracle and/or its affiliates. All rights reserved. 10

11 // src/mylib/-info.java mylib { requires java.base; exports com.myapp.lib.util to myapp; } Copyright 2015, Oracle and/or its affiliates. All rights reserved. 11

12 // src/myapp/-info.java myapp { requires mylib; requires java.base; requires java.sql;??? requires jackson.core?????? requires jackson.databind??? } Copyright 2015, Oracle and/or its affiliates. All rights reserved. 12

13 If only jackson-core jar jackson.core jackson.databind jacksondatabind jar jacksonannotations jar jackson.annotations Copyright 2015, Oracle and/or its affiliates. All rights reserved. 13

14 // src/myapp/-info.java myapp { requires mylib; requires java.base; requires java.sql; requires jackson.core; requires jackson.databind; } Copyright 2015, Oracle and/or its affiliates. All rights reserved. 14

15 myapp mylib jackson.core jackson.databind jackson.annotations java.base java.logging java.sql java.xml Copyright 2015, Oracle and/or its affiliates. All rights reserved. 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 Copyright 2015, 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 Copyright 2015, Oracle and/or its affiliates. All rights reserved. 17

18 Copyright 2015, Oracle and/or its affiliates. All rights reserved. 18

19 lib/jackson-core jar lib/jackson-databind jar lib/jackson-annotations jar src/myapp/-info.java src/myapp/... src/mylib/-info.java src/mylib/... $ javac -sourcepath src -mp lib -d mods... $ jar --create --file mlib/mylib.jar -C mods/mylib. $ jar --create --file mlib/myapp.jar -C mods/myapp. \ -main-class myapp.main Copyright 2015, Oracle and/or its affiliates. All rights reserved. 19

20 $ java -cp \ lib/myapp.jar:\ lib/mylib.jar:\ lib/jackson-core jar:\ lib/jackson-databind jar:\ lib/jackson-annotations jar \ myapp.main $ java -mp mlib:lib m myapp Copyright 2015, Oracle and/or its affiliates. All rights reserved. 20

21 Library Migration Copyright 2015, Oracle and/or its affiliates. All rights reserved. 21

22 Sample Scenario myapp.jar mylib.jar jackson-core jar jacksondatabind jar jacksonannotations jar java.base java.logging java.sql java.xml Copyright 2015, Oracle and/or its affiliates. All rights reserved. 22

23 Migrating from the bottom up myapp.jar mylib.jar jackson.core jackson.databind jackson.annotations java.base java.logging java.sql java.xml Copyright 2015, Oracle and/or its affiliates. All rights reserved. 23

24 Migrating from the bottom jackson.core requires? jackson.core exports? jackson.databind requires? jackson.databind exports? jackson.annotations requires? jackson.annotations exports? Copyright 2015, Oracle and/or its affiliates. All rights reserved. 24

25 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 Copyright 2015, Oracle and/or its affiliates. All rights reserved. 25

26 jackson.databind jackson.core java.sql jackson.annotations java.xml java.base Copyright 2015, Oracle and/or its affiliates. All rights reserved. 26

27 Creating the -info.java for each $ jdeps -geninfo src *.jar writing to src/jackson.annotations/-info.java writing to src/jackson.databind/-info.java writing to src/jackson.core/-info.java Copyright 2015, Oracle and/or its affiliates. All rights reserved. 27

28 // src/jackson.databind/-info.java jackson.databind { requires public java.sql; requires public java.xml; requires public jackson.annotations; requires public jackson.core; 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; } Copyright 2015, Oracle and/or its affiliates. All rights reserved. 28

29 // src/jackson.databind/-info.java jackson.databind { requires public java.sql; requires public java.xml; requires public jackson.annotations; requires public jackson.core; 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; } Copyright 2015, Oracle and/or its affiliates. All rights reserved. 29

30 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 -sourcepath 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. Copyright 2015, Oracle and/or its affiliates. All rights reserved. 30

31 myapp.jar mylib.jar jackson.databind jackson.core jackson.annotations java.base java.logging java.sql java.xml Copyright 2015, Oracle and/or its affiliates. All rights reserved. 31

32 $ java -cp \ lib/myapp.jar:\ lib/mylib.jar:\ lib/jackson-core jar:\ lib/jackson-databind jar:\ lib/jackson-annotations jar \ myapp.main $ java -mp mlib -cp lib/myapp.jar:lib/mylib.jar -addmods jackson.databind \ myapp.main Copyright 2015, Oracle and/or its affiliates. All rights reserved. 32

33 $ java -mp mlib -cp lib/myapp.jar:lib/mylib.jar \ -addmods jackson.databind myapp.main Exception in thread "main" java.lang.reflect.inaccessibleobjectexception: Unable to make member of class app.myvalue accessible: jackson.databind does not read at sun.reflect.reflection.throwinaccessibleobjectexception(java.base@9.0/reflection.java:464) at java.lang.reflect.accessibleobject.checkcansetaccessible(java.base@9.0/accessibleobject.java:175) at java.lang.reflect.constructor.checkcansetaccessible(java.base@9.0/constructor.java:174) at java.lang.reflect.constructor.setaccessible(java.base@9.0/constructor.java:167) at com.fasterxml.jackson.databind.util.classutil.checkandfixaccess(jackson.databind/classutil.java:505) at com.fasterxml.jackson.databind.deser.impl.creatorcollector._fixaccess(jackson.databind/ CreatorCollector.java:280) at com.fasterxml.jackson.databind.deser.impl.creatorcollector.setdefaultcreator(jackson.databind/ CreatorCollector.java:155) : Copyright 2015, Oracle and/or its affiliates. All rights reserved. 33

34 jackson.databind <unnamed> jackson.core jackson.annotations java.base java.sql java.xml Copyright 2015, Oracle and/or its affiliates. All rights reserved. 34

35 package java.lang.reflect; public final class Module { } public String getname(); public boolean canread(module source); public Module addreads(module source); Copyright 2015, Oracle and/or its affiliates. All rights reserved. 35

36 Module source = clazz.getmodule(); this.getclass().getmodule().addreads(source); Copyright 2015, Oracle and/or its affiliates. All rights reserved. 36

37 jackson.databind <unnamed> jackson.core jackson.annotations java.base java.sql java.xml Copyright 2015, Oracle and/or its affiliates. All rights reserved. 37

38 Putting it all together Copyright 2015, Oracle and/or its affiliates. All rights reserved. 38

39 jackson.databind jackson.core jackson.annotations java.base java.logging java.sql java.xml Copyright 2015, Oracle and/or its affiliates. All rights reserved. 39

40 myapp mylib jackson.databind jackson.core jackson.annotations java.base java.logging java.sql java.xml Copyright 2015, Oracle and/or its affiliates. All rights reserved. 40

41 $ java -mp mlib -m myapp Copyright 2015, Oracle and/or its affiliates. All rights reserved. 41

42 Linking Copyright 2015, Oracle and/or its affiliates. All rights reserved. 42

43 $ jlink mp $JDKMODS:mlib addmods myapp output myimage $ ls myimage bin conf lib release $ ls myimage/bin myapp java keytool $ myimage/bin/java -listmods myapp mylib jackson.annotations@2.6.0 jackson.core@2.6.3 jackson.databind@2.6.3 java.base@9.0 java.logging@9.0 java.sql@9.0 java.xml@9.0 Copyright 2015, Oracle and/or its affiliates. All rights reserved. 43

44 $ myimage/bin/java -m myapp Greetings from myapp, here s some json! Copyright 2015, Oracle and/or its affiliates. All rights reserved. 44

45 $ myimage/bin/myapp Greetings from myapp, here s some json! Copyright 2015, Oracle and/or its affiliates. All rights reserved. 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 Some libraries will need changes to work as s Copyright 2015, Oracle and/or its affiliates. All rights reserved. 46

47 Go forth and modularize! Copyright 2015, Oracle and/or its affiliates. All rights reserved. 47

48 Other sessions, this room Project Jigsaw: Under the 5.30pm Project Jigsaw Hack Tuesday 8.30am Copyright 2015, Oracle and/or its affiliates. All rights reserved. 48

49 More Information OpenJDK Project Jigsaw Early Access Builds Copyright 2015, Oracle and/or its affiliates. All rights reserved. 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 2015, Oracle and/or its affiliates. All rights reserved. 50

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