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Introduction to Modular DevelopmentCON5118
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
2
2
3
1
4
5
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What is a module?
3
com.foo.bar
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What is a module?
4
com.foo.bar
com.foo.bar.alpha.Alphacom.foo.bar.alpha.AlphaFactorycom.foo.bar.beta.Betacom.foo.bar.beta.BetaBlocker:
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module com.foo.bar { }
module-info.javacom/foo/bar/alpha/Alpha.javacom/foo/bar/alpha/AlphaFactory.javacom/foo/bar/beta/Beta.javacom/foo/bar/beta/BetaBlocker.java:
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module com.foo.bar { requires com.foo.baz;} com.foo.bar
com.foo.baz
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module com.foo.app { requires com.foo.bar; requires java.sql}
com.foo.app
com.foo.bar java.sql
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com.foo.app
com.foo.bar
java.sql
com.foo.baz
java.base
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com.foo.app
com.foo.bar
java.sql
com.foo.bazjava.loggingjava.xml
java.base
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com.foo.app
java.logging
java.sql
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com.foo.app
java.logging
java.sql
package java.sql;import java.util.logging.Logger;
public class Driver { public Logger getParentLogger() { .. } :}
Driver d = …d.getParentLogger().log(…)
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com.foo.app
java.logging
java.sql
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com.foo.app
java.logging
java.sqlmodule java.sql { requires public java.logging; :}
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com.foo.app
com.foo.bar
java.sql
com.foo.bazjava.loggingjava.xml
java.base
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module com.foo.bar { exports com.foo.bar.alpha; exports com.foo.bar.beta;}
com.foo.bar.alphacom.foo.bar.beta
com.foo.bar.internal
com.foo.bar
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com.foo.app com.foo.bar
Accessibility
reads
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com.foo.app com.foo.bar
Accessibility
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public ⇏ accessible
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Platform modules
19
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$ java -listmodsjava.activation@9.0 java.annotations.common@9.0 java.base@9.0 java.compact1@9.0 java.compact2@9.0 java.compact3@9.0 java.compiler@9.0 java.corba@9.0 java.datatransfer@9.0 java.desktop@9.0 java.instrument@9.0 java.logging@9.0 java.management@9.0 java.naming@9.0 java.prefs@9.0 java.rmi@9.0 java.scripting@9.0 java.se@9.0 java.security.jgss@9.0 java.security.sasl@9.0
java.smartcardio@9.0 java.sql@9.0 java.sql.rowset@9.0 java.transaction@9.0 java.xml@9.0 java.xml.bind@9.0 java.xml.crypto@9.0 java.xml.ws@9.0 jdk.attach@9.0 jdk.charsets@9.0 jdk.compiler@9.0 jdk.crypto.ec@9.0 jdk.crypto.pkcs11@9.0 jdk.hotspot.agent@9.0 jdk.httpserver@9.0 jdk.jartool@9.0 jdk.javadoc@9.0 jdk.jcmd@9.0 jdk.jconsole@9.0 jdk.jdeps@9.0
jdk.jdi@9.0 jdk.jdwp.agent@9.0 jdk.jlink@9.0 jdk.jvmstat@9.0 jdk.localedata@9.0 jdk.management@9.0 jdk.naming.dns@9.0 jdk.naming.rmi@9.0 jdk.pack200@9.0 jdk.policytool@9.0 jdk.rmic@9.0 jdk.scripting.nashorn@9.0 jdk.sctp@9.0 jdk.security.auth@9.0 jdk.security.jgss@9.0 jdk.xml.bind@9.0 jdk.xml.dom@9.0 jdk.xml.ws@9.0 jdk.zipfs@9.0
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Compilation$ javac -d mods/com.foo.baz \ src/com.foo.baz/module-info.java \ src/com.foo.baz/com/foo/baz/Bazooka.java \ :
src/com.foo.baz/module-info.javasrc/com.foo.baz/com/foo/baz/Bazooka.java
mods/com.foo.baz/module-info.classmods/com.foo.baz/com/foo/baz/Bazooka.class
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$ java -modulepath dir1:dir2:dir3 …
module path
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src/com.foo.bar/module-info.javasrc/com.foo.bar/com/foo/bar/alpha/Alpha.java:
23
Compilation$ javac -modulepath mods -d mods/com.foo.bar \ src/com.foo.bar/module-info.java \ src/com.foo.bar/com/foo/bar/alpha/Alpha.class \ :
mods/com.foo.bar/module-info.classmods/com.foo.bar/com/foo/bar/bar/Alpha.class:
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$ java -modulepath mods -m com.foo.app/com.foo.app.MainGreetings from module com.foo.app!
module name main class
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com.foo.app
com.foo.bar
java.sql
java.base
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com.foo.app
com.foo.bar
java.sql
com.foo.bazjava.loggingjava.xml
java.base
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[Resolve] Root module com.foo.app located[Resolve] (file:///d/mods/com.foo.app/)[Resolve] Module com.foo.bar located, required by com.foo.app[Resolve] (file:///d/mods/com.foo.bar/)[Resolve] Module java.base located, required by com.foo.app[Resolve] (jrt:/java.base)[Resolve] Module java.sql located, required by com.foo.app[Resolve] (jrt:/java.sql)[Resolve] Module com.foo.baz located, required by com.foo.bar[Resolve] (file:///d/mods/com.foo.baz/)[Resolve] Module java.logging located, required by java.sql[Resolve] (jrt:/java.logging)[Resolve] Module java.xml located, required by java.sql[Resolve] (jrt:/java.xml)[Resolve] Resolve completed[Resolve] com.foo.app[Resolve] com.foo.bar[Resolve] com.foo.baz[Resolve] java.base[Resolve] java.logging[Resolve] java.sql[Resolve] java.xmlGreetings from module com.foo.app!
$ java -Xdiag:resolver -mp mods -m com.foo.app/com.foo.app.Main
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Packaging as modular JAR
$ jar --create --file mlib/app.jar \ --main-class com.foo.app.Main \ -C mods/com.foo.app .
mods/com.foo.app/module-info.classmods/com.foo.app/com/foo/app/Main.class:
module-info.classcom/foo/app/Main.class:
app.jar
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$ jar --file mlib/app.jar -p
Name: com.foo.appRequires: com.foo.bar java.base [ MANDATED ] java.sqlMain class: com.foo.app.Main
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$ java -mp mlib:mods -m com.foo.appGreetings from module com.foo.app!
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classpath
$ java -cp mlib/baz.jar:app.jar \ com.foo.app.Main
module-info.classcom/foo/baz/Bazooka.class:
com.foo.baz (mlib/baz.jar)
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module path
$ java -mp mlib -m myappmodule-info.classcom/foo/baz/Bazooka.class:
com.foo.baz (mlib/baz.jar)
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classpath and module path
$ java -mp mlib -addmods com.foo.baz \ -cp app.jar com.foo.app.Main
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Linking
jlink
modular run-timeimage
bin conf …
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Linking
$ jlink --modulepath $JDKMODS --addmods java.base --output myimage
$ myimage/bin/java -listmodsjava.base@9.0
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Linking
$ jlink --modulepath $JDKMODS:$MYMODS --addmods com.foo.app --output myimage
$ myimage/bin/java -listmodsjava.base@9.0java.logging@9.0java.sql@9.0java.xml@9.0com.foo.appcom.foo.barcom.foo.baz
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Summary
• Introduced basic concepts• Introduced basic command lines to compile, run, package and link
37
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Other sessions, this room
• Advanced Modular Development @ 2.30pm• Project Jigsaw: Under the Hood @ 5.30pm• Project Jigsaw Hack Session @ Tuesday 8.30am
38
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More Information
OpenJDK Project Jigsaw page, this has links to all the JEPs
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.
40
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src/com.foo.app/module-info.javasrc/com.foo.app/com/foo/app/Main/javasrc/com.foo.bar/module-info.javasrc/com.foo.bar/com/foo/bar/alpha/Alpha.javasrc/com.foo.baz/module-info.javasrc/com.foo.baz/com/foo/baz/Bazooka.java
:
42
Multi-module compilation
$ javac -modulesourcepath src -d mods $(find src -name “*.java”)
mods/com.foo.app/module-info.classmods/com.foo.app/com/foo/app/Main.classmods/com.foo.baz/module-info.classmods/com.foo.baz/com/foo/baz/Bazooka.classmods/com.foo.bar/module-info.classmods/com.foo.bar/com/foo/bar/bar/Alpha.class:
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Testing
$ javac -cp lib/junit.jar -mp mods -d testclasses \ test/com/foo/bar/alpha/test/AlphaTest.java
$ java -cp lib/junit.jar:testclasses -mp mods -addmods com.foo.bar \ org.junit.runner.JUnitCore com.foo.bar.alpha.test.AlphaTest
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Testingcom.foo.bar
exportedpackages
notexported
testclasses
testclasses
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Testing
com.foo.bar
test classes
junit.jar
org.junit.Assertorg.junit.Test:
-XaddReads
-Xmodule/-Xpatch
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Testing
$ javac -cp lib/junit.jar -mp mods -d testmods/com.foo.bar -Xmodule:com.foo.bar \ test/com.foo.bar/com/foo/bar/alpha/AlphaTest.java
$ java -cp lib/junit.jar -mp mods -addmods com.foo.bar \ -Xpatch:testmods -XaddReads:com.foo.bar=ALL-UNNAMED \ org.junit.runner.JUnitCore com.foo.bar.alpha.AlphaTest
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