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Advanced Modular DevelopmentCON6821
Mark Reinhold, Alex Buckley, Alan BatemanJava Platform Group, OracleOctober 2015
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Sessions
Prepare for JDK 9
Introduction to Modular Development
Advanced Modular Development
Project Jigsaw: Under the Hood
Project Jigsaw Hack Session
3
2
2
1
4
5
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Application Migration
3
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Typical application
4
JAR JAR
JAR
JARJAR
JAR JAR
JAR
JARJAR JAR
JAR
JDK
JAR JAR
JAR
JARJAR
JAR
JAR
JARJAR
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Typical application
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JAR JAR
JAR
JAR
JAR
JARJAR JAR
JARJAR JAR
JAR
JARJAR
JAR
JARJAR
modulejava.base
modulejava.logging
modulejava.sql
modulejava.xml
JAR
JAR
JAR
JAR
JAR
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jackson-databind-2.6.3.jar
myapp.jar
modulejava.base
modulejava.logging
mylib.jar
modulejava.xml
modulejava.sql
jackson-annotations-2.6.0.jarjackson-core-2.6.3.jar
SampleScenario
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$ java -cp \ lib/myapp.jar:\ lib/mylib.jar:\ lib/jackson-core-2.6.3.jar:\ lib/jackson-databind-2.6.3.jar:\ lib/jackson-annotations-2.6.0.jar\ myapp.Main
Running my application
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jackson-databind-2.6.3.jar
modulemyapp
modulemylib
jackson-annotations-2.6.0.jarjackson-core-2.6.3.jar
Migrating from the top down
modulejava.base
modulejava.logging
modulejava.xml
modulejava.sql
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Migrating from the top down
• module myapp requires?• module myapp exports?
• module mylib requires?• module mylib exports?
9
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$ jdeps -s lib/myapp.jar lib/mylib.jar myapp.jar -> lib/jackson-core-2.6.3.jar myapp.jar -> lib/jackson-databind-2.6.3.jar myapp.jar -> mylib.jar myapp.jar -> java.base myapp.jar -> java.sql mylib.jar -> java.base
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// src/mylib/module-info.java module mylib { requires java.base; exports com.myapp.lib.util to myapp; }
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// src/myapp/module-info.java module myapp { requires mylib; requires java.base; requires java.sql; ??? requires jackson.core ??? ??? requires jackson.databind ??? }
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If only …
jackson-databind-2.6.3.jar
jackson-core-2.6.3.jar
jackson-annotations-2.6.0.jar
modulejackson.core
modulejackson.databind
modulejackson.annotations
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// src/myapp/module-info.java module myapp { requires mylib; requires java.base; requires java.sql; requires jackson.core; requires jackson.databind; }
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modulejackson.databind
modulemyapp
modulejava.base
modulejava.logging
modulemylib
modulejava.xml
modulejava.sql
modulejackson.annotations
modulejackson.core
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Automatic modules
• “Real” modules• No changes to someone else’s JAR file :-)• Module name derived from JAR file name• Exports all its packages• Requires all other modules
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modulemyapp
modulemylib
modulejackson.databind
modulejackson.annotations
modulejackson.core
modulejava.xml
modulejava.sql
modulejava.logging
modulejava.base
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lib/jackson-core-2.6.3.jar lib/jackson-databind-2.6.3.jar lib/jackson-annotations-2.6.0.jar
src/myapp/module-info.java src/myapp/...
src/mylib/module-info.java src/mylib/...
$ javac -modulesourcepath 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
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$ java -mp mlib:lib —m myapp
$ java -cp \ lib/myapp.jar:\ lib/mylib.jar:\ lib/jackson-core-2.6.3.jar:\ lib/jackson-databind-2.6.3.jar:\ lib/jackson-annotations-2.6.0.jar \ myapp.Main
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Library Migration
21
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jackson-databind-2.6.3.jar
myapp.jar
modulejava.base
modulejava.logging
mylib.jar
modulejava.xml
modulejava.sql
jackson-annotations-2.6.0.jarjackson-core-2.6.3.jar
SampleScenario
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modulejackson.databind
myapp.jar
modulejava.base
modulejava.logging
mylib.jar
modulejava.xml
modulejava.sql
modulejackson.annotations
modulejackson.core
Migrating from the bottom up
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Migrating from the bottom
• module jackson.core requires?• module jackson.core exports?• module jackson.databind requires?• module jackson.databind exports?• module jackson.annotations requires?• module jackson.annotations exports?
24
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Requires?
25
$ jdeps -s lib/jackson*.jar jackson-annotations-2.6.0.jar -> java.base jackson-core-2.6.3.jar -> java.base jackson-databind-2.6.3.jar -> lib/jackson-annotations-2.6.0.jar jackson-databind-2.6.3.jar -> lib/jackson-core-2.6.3.jar jackson-databind-2.6.3.jar -> java.base jackson-databind-2.6.3.jar -> java.sql jackson-databind-2.6.3.jar -> java.xml
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jackson.databind
jackson.core java.sql
jackson.annotations java.xml
java.base
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Creating the module-info.java for each module
27
$ jdeps -genmoduleinfo src *.jar writing to src/jackson.annotations/module-info.java writing to src/jackson.databind/module-info.java writing to src/jackson.core/module-info.java
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// src/jackson.databind/module-info.java module 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.module; 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; }
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// src/jackson.databind/module-info.java module 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.module; 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; }
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src/jackson.core/module-info.java src/jackson.core/...
src/jackson.databind/module-info.java src/jackson.databind/...
src/jackson.annotations/module-info.java src/jackson.annotations/...
$ javac -modulesourcepath src -d mods ...
$ jar --create --file mlib/jackson.core-2.6.3.jar \ —-module-version 2.6.3 -C mods/jackson.core .
$ jar --create --file mlib/jackson.databind-2.6.3.jar \ —-module-version 2.6.3 -C mods/jackson.databind .
$ jar --create --file mlib/jackson.annotations-2.6.0.jar \ —-module-version 2.6.0 -C mods/jackson.annotations .
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modulejackson.databind
modulejava.logging
modulejava.sql
modulejackson.core
modulejackson.annotations
myapp.jar mylib.jar
modulejava.base
modulejava.xml
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$ java -mp mlib -cp lib/myapp.jar:lib/mylib.jar -addmods jackson.databind \ myapp.Main
$ java -cp \ lib/myapp.jar:\ lib/mylib.jar:\ lib/jackson-core-2.6.3.jar:\ lib/jackson-databind-2.6.3.jar:\ lib/jackson-annotations-2.6.0.jar \ myapp.Main
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$ 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: module jackson.databind does not read <unnamed module @6536e911> 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) :
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jackson.databind
jackson.core
java.sqljackson.annotations
java.xml
<unnamed>
java.base
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package java.lang.reflect;
public final class Module {
public String getName();
public boolean canRead(Module source); public Module addReads(Module source);
… }
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Module source = clazz.getModule();this.getClass().getModule().addReads(source);
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jackson.databind
jackson.core
jackson.annotations
<unnamed>
java.sql java.xmljava.base
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Putting it all together
38
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modulejackson.databind
modulejava.logging
modulejava.sql
modulejackson.core
modulejackson.annotations
modulejava.base
modulejava.xml
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modulejackson.databind
modulejava.logging
modulejava.sql
modulejackson.core
modulejackson.annotations
modulejava.base
modulejava.xml
modulemyapp
modulemylib
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$ java -mp mlib -m myapp
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Linking
42
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$ 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
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$ myimage/bin/java -m myapp Greetings from myapp, here’s some json!
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$ myimage/bin/myapp Greetings from myapp, here’s some json!
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Summary
• Freedom to adopt modules at your own pace• Modularize your application before its libraries• Modularize libraries independently
• Different kinds of modules• Explicit vs. automatic
• Some libraries will need changes to work as modules
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Go forth and modularize!
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Other sessions, this room
• Project Jigsaw: Under the Hood @ 5.30pm• Project Jigsaw Hack Session @ Tuesday 8.30am
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More Information
OpenJDK Project Jigsaw
http://openjdk.java.net/projects/jigsaw/
mailto:jigsaw-dev@openjdk.java.net
Early Access Builds
https://jdk9.java.net/jigsaw/
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Safe Harbor StatementThe 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.
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