The Free Javaws Implementation in IcedTea Omair Majid Associate - - PowerPoint PPT Presentation

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the free javaws implementation in icedtea
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The Free Javaws Implementation in IcedTea Omair Majid Associate - - PowerPoint PPT Presentation

Sep 29, 2022 210 likes •711 views

The Free Javaws Implementation in IcedTea Omair Majid Associate Software Engineer Red Hat 2011-02-05 1 Overview of the Talk Background about JNLP Netx's Architecture Recent developments in Netx Future 2 Background 3 What's

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The Free Javaws Implementation in IcedTea

Omair Majid Associate Software Engineer Red Hat 2011-02-05

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Overview of the Talk

  • Background about JNLP
  • Netx's Architecture
  • Recent developments in Netx
  • Future
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Background

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What's the name again?

  • Java Network Launching Protocol
  • Java Web Start
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Overview of JNLP

A way to run Java applications securely without installing them

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Running JNLPs - Hyperlinks

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Running JNLPs – Command Line

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The Standard

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Other Resources

  • Java Deployment Documentation
  • http://download.oracle.com/javase/6/docs/technotes/guides/jweb/

deployment_advice.html#deployingApplications

  • Existing JNLP Applications
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JNLP Application

XML File Jars

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JNLP File Example

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Demo

  • Show JNLP File
  • Show Code
  • Run
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Netx

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  • What Is It?
  • Architecture
  • Components in Depth
  • Netx and the Plugin
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Netx

  • Originally at http://jnlp.sourceforge.net/netx/
  • Last updated in 2003
  • Designed as a library
  • About 18k lines of Java
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Netx

  • Imported into IcedTea in 2008
  • The default javaws implementation in most

distributions

  • About 27k lines of code
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Overall Architecture

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Overall Architecture

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Parser

Parses a JNLP (an XML file) and converts it into a set of java objects

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JNLPFile InformationDesc ResourcesDesc ApplicationDesc JARDesc

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Parser

  • The main class is net.sourceforge.jnlp.Parser
  • Most of the code is under net.sourceforge.jnlp
  • Elements are named <element>Desc
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Parser

Uses (in-tree) NanoXML to parse

... and lives with the consequences

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ClassLoader

JNLPClassLoader Application Bootstrap ClassLoader

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ClassLoaders - Lazy

Download Jars only when needed

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ClassLoader - Security

Along with loading classes, associates permissions with them

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Cache

  • Recall that applications are not installed
  • File are cached in ~/.icedtea/cache/
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Cache - Downloading

  • Multiple threads spawned
  • Each file goes through multiple states to arrive at
  • Error
  • Or Downloaded
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Verifier

Verifier Keystore

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Services

Allow unsigned applications to break the sandbox (securely)

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Services

Access to Files

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Services - Integration

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Secure GUI

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Security Manager

  • Custom security manager
  • Allows some permissions
  • Custom policy can be defined
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Security/ClassLoader/Verifier Demo

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Service Demo

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Netx and the Plugin

The plugin relies on Netx for most

  • f its non browser functionality
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Plugin in the component framework

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Recent Developments in Netx

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Versioned/Packed Jars – Sever Side

  • Server-side
  • content-encoding
  • version-id
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Versioned/Packed Jars – Client Side

test.jar test__V1.56.3.0x0.pack.gz test.jar

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Support for deployment.properties

  • Allows configuring almost every part of netx
  • Described at
  • http://download.oracle.com/javase/6/docs/technotes/gui

des/deployment/deployment-guide/contents.html

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Deployment.properties

  • Located at ~/.icedtea/deployment.properties
  • Key-value pairs in the standard properties

file format

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Proxy Support

  • Read proxy settings from deployment.properites
  • Or Firefox's preferences
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Custom Policies

  • Possible to sandbox trusted applications
  • Possible to grant untrusted applications some

permissions

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TagSoup-based Parser

  • Instead of a XML parser, use a html parser
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The Future

  • Better compatibility
  • Implement missing JNLP API services
  • Use libproxy
  • Better system integration
  • Stuff Deepak mentioned...
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Questions