You, me and jigsaw Tom Schindl <tom.schindl@bestsolution.at> - - PowerPoint PPT Presentation

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You, me and jigsaw Tom Schindl <tom.schindl@bestsolution.at> - - PowerPoint PPT Presentation

Mar 28, 2024 336 likes •935 views

You, me and jigsaw Tom Schindl <tom.schindl@bestsolution.at> Twitter: @tomsontom Blog: http://tomsondev.bestsolution.at Website: http://www.bestsolution.at About Tom CTO BestSolution.at Systemhaus GmbH Eclipse Committer e4

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You, me and jigsaw

Tom Schindl <tom.schindl@bestsolution.at> Twitter: @tomsontom Blog: http://tomsondev.bestsolution.at Website: http://www.bestsolution.at

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About Tom

  • CTO BestSolution.at Systemhaus GmbH
  • Eclipse Committer
  • e4
  • Platform
  • EMF
  • Project lead
  • e(fx)clipse
  • Twitter: @tomsontom
  • Blog: tomsondev.bestsolution.at
  • Corporate: http://bestsolution.at
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The target of jigsaw

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The target of jigsaw

  • Main target split of the rt.jar into smaller pieces
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The target of jigsaw

  • Main target split of the rt.jar into smaller pieces
  • Easier to maintain
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The target of jigsaw

  • Main target split of the rt.jar into smaller pieces
  • Easier to maintain
  • Avoid people from accessing internal APIs (misc.Unfafe)
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The target of jigsaw

  • Main target split of the rt.jar into smaller pieces
  • Easier to maintain
  • Avoid people from accessing internal APIs (misc.Unfafe)
  • Allow to ship stripped down JREs with applications
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The target of jigsaw

  • Main target split of the rt.jar into smaller pieces
  • Easier to maintain
  • Avoid people from accessing internal APIs (misc.Unfafe)
  • Allow to ship stripped down JREs with applications

user@system: java -listmods

java.activation@9-ea java.annotations.common@9-ea java.base@9-ea java.compact1@9-ea java.compact2@9-ea java.compact3@9-ea java.compiler@9-ea java.corba@9-ea // …

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The target of jigsaw

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The target of jigsaw

  • The 2nd target is to allow applications developers to

write modular applications

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The target of jigsaw

  • The 2nd target is to allow applications developers to

write modular applications

  • Using the Java9 modules for your code is OPTIONAL
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The target of jigsaw

  • The 2nd target is to allow applications developers to

write modular applications

  • Using the Java9 modules for your code is OPTIONAL
  • Java code not included in a module is wrapped at

runtime in an UNAMED-Module

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The target of jigsaw

  • The 2nd target is to allow applications developers to

write modular applications

  • Using the Java9 modules for your code is OPTIONAL
  • Java code not included in a module is wrapped at

runtime in an UNAMED-Module

  • Your existing application (whether OSGi based or not)

will run unmodified on Java9

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The target of jigsaw

  • The 2nd target is to allow applications developers to

write modular applications

  • Using the Java9 modules for your code is OPTIONAL
  • Java code not included in a module is wrapped at

runtime in an UNAMED-Module

  • Your existing application (whether OSGi based or not)

will run unmodified on Java9

  • (as long as you not touch into JDK internals)
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Show some source code

  • You can find out information at runtime using

Class#getModule()

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Show some source code

  • You can find out information at runtime using

Class#getModule()

public class Sample1 { public static void main(String[] args) { System.err.println( String.class + " is in Module '" + String.class.getModule().getName() + "'" ); System.err.println( javax.swing.JPanel.class + " is in Module '" + javax.swing.JPanel.class.getModule().getName() + "'" ); System.err.println( Sample1.class + " is in Module '" + Sample1.class.getModule().getName() + "'" ); } }

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Show some source code

  • You can find out information at runtime using

Class#getModule()

public class Sample1 { public static void main(String[] args) { System.err.println( String.class + " is in Module '" + String.class.getModule().getName() + "'" ); System.err.println( javax.swing.JPanel.class + " is in Module '" + javax.swing.JPanel.class.getModule().getName() + "'" ); System.err.println( Sample1.class + " is in Module '" + Sample1.class.getModule().getName() + "'" ); } } javac src/sample/Sample1.java java -cp src sample.Sample1

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Show some source code

  • You can find out information at runtime using

Class#getModule()

public class Sample1 { public static void main(String[] args) { System.err.println( String.class + " is in Module '" + String.class.getModule().getName() + "'" ); System.err.println( javax.swing.JPanel.class + " is in Module '" + javax.swing.JPanel.class.getModule().getName() + "'" ); System.err.println( Sample1.class + " is in Module '" + Sample1.class.getModule().getName() + "'" ); } } user@system: java sample.Sample1

class java.lang.String is in Module 'java.base' class javax.swing.JPanel is in Module 'java.desktop' class sample.Sample1 is in Module 'null'

javac src/sample/Sample1.java java -cp src sample.Sample1

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Anantomy of a Java9 Module

  • Module information is encoded in a java file named module-

info.java/.class

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Anantomy of a Java9 Module

  • Module information is encoded in a java file named module-

info.java/.class

OSGi

Manifest-Version: 1.0 Bundle-ManifestVersion: 2 Bundle-SymbolicName: myfoobar Require-Bundle: com.foo, com.bar Export-Package: com.mybar, com.myfoo

MANIFEST.MF

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Anantomy of a Java9 Module

  • Module information is encoded in a java file named module-

info.java/.class

OSGi

Manifest-Version: 1.0 Bundle-ManifestVersion: 2 Bundle-SymbolicName: myfoobar Require-Bundle: com.foo, com.bar Export-Package: com.mybar, com.myfoo

MANIFEST.MF

module myfoobar{ requires com.foo; requires com.bar; exports com.mybar; exports com.myfoo; }

Java9 module module-info.java

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Anantomy of a Java9 Module

  • Things to take a way
  • Java9 modules use the OSGi-Require-Bundle strategy to

express dependencies

  • Java9 modules explicitly have to export packages like

OSGi to make them accessible

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Show some source code

  • Build a module
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Show some source code

  • Build a module

module BasicModule { }

module-info.java

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Show some source code

  • Build a module

module BasicModule { }

module-info.java

javac -modulepath ../mods -d ../mods/BasicModule src/module-info.java src/sample/Sample1.java java -modulepath ../mods -m BasicModule/sample.Sample1

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Show some source code

  • Build a module

module BasicModule { }

module-info.java

javac -modulepath ../mods -d ../mods/BasicModule src/module-info.java src/sample/Sample1.java java -modulepath ../mods -m BasicModule/sample.Sample1

src/sample/Sample1.java:9: error: package javax.swing does not exist System.err.println( javax.swing.JPanel.class ^ src/sample/Sample1.java:11: error: package javax.swing does not exist + javax.swing.JPanel.class.getModule().getName() +"'" ); ^ 2 errors class java.lang.String is in Module 'java.base' Exception in thread "main" java.lang.IllegalAccessError: class sample.Sample1 (in module BasicModule) cannot access class javax.swing.JPanel (in module java.desktop) because module BasicModule does not read module java.desktop at sample.Sample1.main(BasicModule/Sample1.java:9)

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Show some source code

  • Build a module

module BasicModule { }

module-info.java

javac -modulepath ../mods -d ../mods/BasicModule src/module-info.java src/sample/Sample1.java java -modulepath ../mods -m BasicModule/sample.Sample1

src/sample/Sample1.java:9: error: package javax.swing does not exist System.err.println( javax.swing.JPanel.class ^ src/sample/Sample1.java:11: error: package javax.swing does not exist + javax.swing.JPanel.class.getModule().getName() +"'" ); ^ 2 errors class java.lang.String is in Module 'java.base' Exception in thread "main" java.lang.IllegalAccessError: class sample.Sample1 (in module BasicModule) cannot access class javax.swing.JPanel (in module java.desktop) because module BasicModule does not read module java.desktop at sample.Sample1.main(BasicModule/Sample1.java:9) class java.lang.String is in Module 'java.base' class javax.swing.JPanel is in Module 'java.desktop' class sample.Sample1 is in Module ‚BasicModule'

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Anantomy of a Java9 Module

  • Is it really based on Require-Bundle????
  • Yep it is
  • Is that a problem
  • Yep IMHO it is
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The Require-Bundle problem

pre Java9 world

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The Require-Bundle problem

pre Java9 world

guava-19.jar lib-a.jar lib-b.jar

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The Require-Bundle problem

pre Java9 world

guava-19.jar lib-a.jar lib-b.jar

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The Require-Bundle problem

pre Java9 world

guava-19.jar lib-a.jar lib-b.jar myApp.jar

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The Require-Bundle problem

Java9 world

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The Require-Bundle problem

Java9 world

lib-a.jmod lib-b.jmod myApp.jmod

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The Require-Bundle problem

Java9 world

lib-a.jmod lib-b.jmod myApp.jmod google.guava-19.jmod

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The Require-Bundle problem

Java9 world

lib-a.jmod lib-b.jmod myApp.jmod com.google.guava-19.jmod google.guava-19.jmod

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Java9 Module and Reflection

  • OSGi modularity is built on Classloaders
  • Java9 modularity is built on the VM
  • Suppose the following situation

Module A

export bar

Module B

export foo

Module C

requires ModuleA & ModuleB

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Java9 Module and Reflection

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Java9 Module and Reflection

import serializer.Serializer; import sample.Sample1; public class User { public static void main(String[] args) { System.err.println("VALUE: " + Serializer.createInstance(Sample1.class)); } }

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Java9 Module and Reflection

import serializer.Serializer; import sample.Sample1; public class User { public static void main(String[] args) { System.err.println("VALUE: " + Serializer.createInstance(Sample1.class)); } } public class Serializer { public static <T> T createInstance(Class<T> clazz) { try { java.lang.reflect.Constructor<?> c = clazz.getDeclaredConstructors()[0]; c.setAccessible(true); return (T)c.newInstance(); } catch( Throwable t ) { throw new RuntimeException(t); } } }

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Java9 Module and Reflection

import serializer.Serializer; import sample.Sample1; public class User { public static void main(String[] args) { System.err.println("VALUE: " + Serializer.createInstance(Sample1.class)); } } public class Serializer { public static <T> T createInstance(Class<T> clazz) { try { java.lang.reflect.Constructor<?> c = clazz.getDeclaredConstructors()[0]; c.setAccessible(true); return (T)c.newInstance(); } catch( Throwable t ) { throw new RuntimeException(t); } } }

Produces a runtime exception

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Java9 Module and Reflection

import serializer.Serializer; import sample.Sample1; public class User { public static void main(String[] args) { System.err.println("VALUE: " + Serializer.createInstance(Sample1.class)); } } public class Serializer { public static <T> T createInstance(Class<T> clazz) { try { java.lang.reflect.Constructor<?> c = clazz.getDeclaredConstructors()[0]; c.setAccessible(true); return (T)c.newInstance(); } catch( Throwable t ) { throw new RuntimeException(t); } } }

Produces a runtime exception

public class Serializer { public static <T> T createInstance(Class<T> clazz) { try { Serializer.class.getModule().addReads( clazz.getModule() ); java.lang.reflect.Constructor<?> c = clazz.getDeclaredConstructors()[0]; c.setAccessible(true); return (T)c.newInstance(); } catch( Throwable t ) { throw new RuntimeException(t); } } }

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Java9 Module and Reflection

import serializer.Serializer; import sample.Sample1; public class User { public static void main(String[] args) { System.err.println("VALUE: " + Serializer.createInstance(Sample1.class)); } } public class Serializer { public static <T> T createInstance(Class<T> clazz) { try { java.lang.reflect.Constructor<?> c = clazz.getDeclaredConstructors()[0]; c.setAccessible(true); return (T)c.newInstance(); } catch( Throwable t ) { throw new RuntimeException(t); } } }

Produces a runtime exception

public class Serializer { public static <T> T createInstance(Class<T> clazz) { try { Serializer.class.getModule().addReads( clazz.getModule() ); java.lang.reflect.Constructor<?> c = clazz.getDeclaredConstructors()[0]; c.setAccessible(true); return (T)c.newInstance(); } catch( Throwable t ) { throw new RuntimeException(t); } } }

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Java9 Module and Reflection

import serializer.Serializer; import sample.Sample1; public class User { public static void main(String[] args) { System.err.println("VALUE: " + Serializer.createInstance(Sample1.class)); } } public class Serializer { public static <T> T createInstance(Class<T> clazz) { try { java.lang.reflect.Constructor<?> c = clazz.getDeclaredConstructors()[0]; c.setAccessible(true); return (T)c.newInstance(); } catch( Throwable t ) { throw new RuntimeException(t); } } }

Produces a runtime exception

public class Serializer { public static <T> T createInstance(Class<T> clazz) { try { Serializer.class.getModule().addReads( clazz.getModule() ); java.lang.reflect.Constructor<?> c = clazz.getDeclaredConstructors()[0]; c.setAccessible(true); return (T)c.newInstance(); } catch( Throwable t ) { throw new RuntimeException(t); } } } mark.reinhold at oracle.com mark.reinhold at oracle.com Tue Mar 1 17:42:05 UTC 2016 Previous message: Preparing for EDR: Issue summary Next message: SO files in module images and SELinux Messages sorted by: [ date ] [ thread ] [ subject ] [ author ] Issue summary [1]: Having to add read edges dynamically just to enable reflection is painful, and could slow migration and adoption. Consider relaxing the access model so that reflection does not require, or perhaps simply assumes, readability. Proposal: Adopt the second alternative suggested in the summary. Revise the core reflection APIs (java.lang.reflect) to assume that any module that contains code that invokes a reflective operation can read the module that defines the types that are the subject of that operation. As a consequence, most code that uses reflection will not have to take the trouble to add readability edges manually. Code of this form that was previously added to the prototype implementation will be removed. This proposal does weaken the fidelity story a tiny bit, in the sense that you'll be able to do more at run time than you can in earlier phases, but that seems a worthwhile tradeoff in order to ease migration.

  • Mark
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Final step package up

  • Constructing your custom Java-Install is called linking
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Final step package up

  • Constructing your custom Java-Install is called linking

user@host: jlink --modulepath ../../jmods:../mods/ --addmods Serializer,User --output myimage

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Final step package up

  • Constructing your custom Java-Install is called linking

user@host: jlink --modulepath ../../jmods:../mods/ --addmods Serializer,User --output myimage user@host: myimage/bin/java -listmods BasicModule Serializer User java.base@9-ea java.datatransfer@9-ea java.desktop@9-ea java.prefs@9-ea java.xml@9-ea

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Final step package up

  • Constructing your custom Java-Install is called linking

user@host: jlink --modulepath ../../jmods:../mods/ --addmods Serializer,User --output myimage user@host: myimage/bin/java -listmods BasicModule Serializer User java.base@9-ea java.datatransfer@9-ea java.desktop@9-ea java.prefs@9-ea java.xml@9-ea user@host: myimage/bin/java user.User

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So what’s a .jmod file?

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So what’s a .jmod file?

  • jmod is the deployment unit for Java9 modules
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So what’s a .jmod file?

  • jmod is the deployment unit for Java9 modules
  • the format of jmod is NOT fixed
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So what’s a .jmod file?

  • jmod is the deployment unit for Java9 modules
  • the format of jmod is NOT fixed
  • what’s guaranteed is that jmods can be read using NIO.2
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So what’s a .jmod file?

  • jmod is the deployment unit for Java9 modules
  • the format of jmod is NOT fixed
  • what’s guaranteed is that jmods can be read using NIO.2

class JModSample { public static void main(String[] args) throws Exception { FileSystem fs = FileSystems.newFileSystem(Paths.get( "…/jmods/java.activation.jmod" ), null); Path root = fs.getPath("/"); Files.walkFileTree(root, new SimpleFileVisitor<Path>() { public FileVisitResult visitFile(Path file, BasicFileAttributes attrs) throws IOException { System.err.println("Found: " + file); return FileVisitResult.CONTINUE; } }); } }

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e4 and Java9 Modules

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e4 and Java9 Modules

  • e4 & OSGi applications run unmodified on Java9
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e4 and Java9 Modules

  • e4 & OSGi applications run unmodified on Java9
  • Could e4 ditch OSGi in favor of Java9 modules
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e4 and Java9 Modules

  • e4 & OSGi applications run unmodified on Java9
  • Could e4 ditch OSGi in favor of Java9 modules
  • Short them no
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e4 and Java9 Modules

  • e4 & OSGi applications run unmodified on Java9
  • Could e4 ditch OSGi in favor of Java9 modules
  • Short them no
  • Midterm probably - we (BestSolution) are looking at

that doing that for e4 on JavaFX

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e4 and Java9 Modules

  • e4 & OSGi applications run unmodified on Java9
  • Could e4 ditch OSGi in favor of Java9 modules
  • Short them no
  • Midterm probably - we (BestSolution) are looking at

that doing that for e4 on JavaFX

  • Biggest stumbling block was/is the OSGi-Service-

Registry