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  3. JPMS

JPMS

What every Java developer should know about the Java Module System

Hendrik Ebbers (Open Elements GmbH)
Karsten Thoms (itemis AG)

With version 9 the new module system became part of Java. Since Java 11 is the new LTS version many developers want to migrate to this new version and will be faced with modules.

In this session we will give an introduction to modules for application and library developers. We will give an introduction to the module-info syntax and discuss what are the differences between named modules and automatic modules.

Attendees will learn how they can modularize existing applications and libraries step by step.

Experience level: 
Intermediate

Java & JDT
Java & JDT

Modularity is more evolved than invented

Todor Boev (Software AG)

In this talk we will follow a single rule to gradually discover the design principles at the root of most modular runtimes: OSGi, java modules, even microservices. We will contend that the degree to which a software system is committed to following this rule drives it's final shape in a way similar to natural evolution. We believe this will help software professionals understand why their modular applications exhibit certain traits like the particular distribution of complexity between modules.

Experience level: 
Beginner

OSGi
OSGi

Taming the Hydra: The Labors with Multi-Release JAR Files

Werner Keil (Self Employed)
Otavio Santana (Self-employed)

Although Multi-Release JAR files were introduced with Java 9 at the same time as Jigsaw (JPMS), this feature has been overshadowed by others, especially Jigsaw, JShell or even the Platform Logging API. This could be part of the reason why most of the popular build tools and also major IDEs don't really support it out of the box even more than 3 years after it was introduced. A lack that affects both the creation of a multi-release JAR file and using it in your application.

Experience level: 
Beginner

Java & JDT
Java & JDT

Puzzling out Java's Project Jigsaw

Theresa Mammarella (IBM)

While modularity isn't exactly new (ehem... OSGi), the introduction of Jigsaw (JPMS) in Java 9 moved the concept to the front of developers minds. But while migrating to Java 9+ brings some challenges, it's not actually necessary to write modules. So why care about modularity if the classpath is still good enough? Can modularity bring any practical value to your applications? In this session I'll discuss why you should consider leveraging JPMS in designing new Java applications and highlight some practical knowledge and resources to get you started.

Experience level: 
Beginner

Java & JDT
Java & JDT

Building OSGi Projects with Bnd in Maven

Raymond Auge (Liferay Inc.)
Tim Ward (Kentyou)

The OSGi Alliance via enroute.osgi.org and bndtools.org teams have spent a number of years focused on improving support for OSGi development in Maven. This talk will demonstrate the latest innovations demonstrating features such as quick setup, minimal configuration, use of bundle annotations, BOM support, integration testing, assembly and running, live coding, dual OSGi/JPMS library development.

Experience level: 
Intermediate

OSGi

OSGi and Java 9+

BJ Hargrave (IBM)

Java 9 introduced the Java Platform Module System (JPMS) as a way to modularize the Java platform and it can be also be used by developers to modularize their own applications, although JPMS lack a number of important features for software running on the Java platform.

As people look to support the latest versions of the Java platform, changes introduced in Java 9 related to JPMS led to the needs for some features in the OSGi Core specification. OSGi framework implementations like Eclipse Equinox and Apache Felix and tools like Bnd were updated to support these new features.

Experience level: 
Beginner

OSGi

Meld OSGi Bundles with Java Modules

Udo Hafermann (Software AG)
Todor Boev (Software AG)

The Java Platform Module System delegates the job of selecting a consistent pool of modules to an external party.
The OSGi Resolver happens to be a tool for selecting a consistent set of resources. Any resources. Even JPMS modules. All we need to do is encode their dependencies properly. An interesting consequence of this is that now JPMS modules can also be selected as dependencies to other kinds of resources. Even OSGi bundles...

Experience level: 
Intermediate

OSGi

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