The document discusses the transition from Java to .NET, highlighting the differences between Java and C#, and various interoperability tools like jnbridgepro and ikvm.net. It explores Java's OOP features, web services, and the implications of using different frameworks and libraries in these ecosystems. Additionally, it addresses the economic and work conditions related to developers' mobility and skill reusability in the evolving tech landscape.

1. Life after JavaReusing code and skills in a .NET world

2. AgendaJava- OOP language vsplatformJava vs C#Components & Controls vs JavaBeansPME (Property – Method – Event) modelJUMP & J#Java – COM bridgesIKVM.net Web ServicesWSRP : Web Services for Remote Portlets

3. Java as an OOPlanguageInheritance, Polymorphism, Dynamic Class Loading, Exceptions...Great esteem and proved record at academiaMultitude of related libraries and software, mainly OpenSourceLots of new programmers introduced to the Java language during their studies

4. Java as a platformJava 1.x –command line, AWT andAppletsJava 1.2, 1.3, … = Java 2 (JFC/Swing, …)JavaSE (= Standard Edition – Desktops)JavaEE (= Enterprise Edition – Servers)JavaME (= Micro Edition – Mobiles)(Re)focus  JavaFX (Java vs JavaScript)

5. The future of Java?Change in prioritiesSun Microsystems  OracleJDeveloper vs NetBeans IDEJava Cloud, Java.net  Kenai Java.netCopyright issuesSun vs Microsoft (MSJVM)Oracle vs Google (Android Dalvik VM)No standardization by established international organisations (ISO pull-out)

6. Economics & work conditions:CompetitiveFluctuating Worker mobilityReuse:CodeSkillsFlexibility = invaluable ally

7. Java vs C#Anders Hejlsberg original author ofTurbo Pascalchief architect of DelphiJ++, WFC (Windows Foundation Classes)lead architect ofC#LINQ (Language Integrated Query)C# = Java + Object Pascal (Delphi) + VB ++

8. ComponentsUnstructured DataRecord = Structured, Addressable (Name, Pos) DataObject = Record + Methods to manipulate its dataComponent = Object + PME + Resources (Packaging) Agent = Component + (Internal) Logic / Program Loop

9. Controls / WidgetsControl / Widget = User Interface ComponentJavaBeans:Components (non visible)Controls (usually JFC/Swing /Model-ViewController [M-VC])Enterprise JavaBeans “similar” toCOM+ components (not much related to typicalJavaBeans)for J2EE

10. PME (Property-Method-Event)Properties (get/set accessors, metadata)Methods (OOP)EventsJava: initially tightly-coupled (base classes / abstract methods), later on callback interfacesVB: method signatures (WithEvents)Object Pascal / Delphi: method variablesC#: delegates

11. JUMP & J# (Microsoft)JUMPImport Java “projects” from Visual StudioConvert Java code toC#J#Java compiler  IL code, not Java bytecodeJava datatype boxingJava 1.x class library, Swing & Collections APIUp until Visual Studio 2005

12. Java – COM/.NET bridges (1)JACOB (OpenSource)COM Automation from Java via JNI wrappersjacoZoomActiveX Controls / Servers ([D]COM / Automation)J-Integra .COMDCOM wire protocol (ORPC) topure JavaJ-Integra .NET.NET Remoting wire protocolto pure Java, Visual Studio & Eclipse plugins

13. Java – COM/.NET bridges (2)COMConnectJava  COM/.NET – stateful TCP, low latencyJni4net (OpenSource)intra-process, object oriented, JNI implementationJNBridgeProVisual Studio & Eclipse plugins, shared memory, sockets, network binary protocol, HTTP/SOAPEZ JComJavaCOM/.NET, drag-drop Swing components

14. Java – COM/.NET bridges (3)Java Plug-in (JavaBeans Bridge for ActiveX)Sun/Oracle Java VM, Web Browser integration, JavaBeans ActiveX controls (typelibrary)Java C# Bridge (OpenSource)Serlializing/DeserlializingJava - C# objects, manual authorC# object or use generic JavaObject and dynamic queryCaffeine (OpenSource)Hosting JVM in .NET Runtime,JNI OOP wrapperR-JAX (pioneering, RMI/HTTP, obsolete)

15. JNBridgePro – Call Java from .NET

16. JNBridgePro – Call Java from .NET (1)

17. JNBridgePro – Call Java from .NET (2)Start Proxy Generator

18. JNBridgePro – Call Java from .NET (3)Edit Classpath

19. JNBridgePro – Call Java from .NET (4)Class Path Entries

20. JNBridgePro – Call Java from .NET (5)Load Classes

21. JNBridgePro – Call Java from .NET (6)Load Classes Progress

22. JNBridgePro – Call Java from .NET (7)Choose Proxies

23. JNBridgePro – Call Java from .NET (8)Generate Proxies

24. JNBridgePro – Call Java from .NET (9)Use the Proxies

25. JNBridgePro – Call Java from .NET (10)Call Java Methods

26. JNBridgePro – Call Java from .NET (11)Run the Program

27. JNBridgePro – Call Java from .NETVisually generate proxies: allow .Netaccess Java classesLink .NET proxy assembly to .NET development project (Add Reference)Write .NET code to access Java classes(with IntelliSense)Edit configuration - specify communications mechanism (from in-process on same machine to cross-network)Run integrated .NET and Java code (managed lifecycles)

28. JNBridgePro – Call .NET from Java

29. JNBridgePro – Call .NET from Java (1)

30. JNBridgePro – Call .NET from Java (2)Start Proxy Generator

31. JNBridgePro – Call .NET from Java (3)Add Assembly

32. JNBridgePro – Call .NET from Java (4)Assembly List Entries

33. JNBridgePro – Call .NET from Java (5)Load Classes

34. JNBridgePro – Call .NET from Java (6)Load Class Progress

35. JNBridgePro – Call .NET from Java (7)Choose Proxies

36. JNBridgePro – Call .NET from Java (8)Generate Proxies

37. JNBridgePro – Call .NET from Java (9)Use the Proxies

38. JNBridgePro – Call .NET from Java (10)Call .NET Objects

39. JNBridgePro – Call .NET from Java (11)Run the Program

40. JNBridgePro – Call .NET from JavaVisually generate proxies: allow Java access .NET classesReference Java proxy .JAR file from Java development project (place in build CLASSPATH)Write Java code to access .NET classesEdit configuration - specify communications mechanism (from in-process on same machine to cross-network)Run integrated .NET and Java code (managed lifecycles)

41. JNBridgePro – Visual Studio plugin

42. JNBridgePro – Eclipse plugin

43. JNBridgePro – Communications

44. IKVM.net (Jeroen Frijters)JavaVirtual Machine (JVM) implementation:Microsoft .NET FrameworkMonoComponents:Java Virtual Machine in .NETJava class librariesin .NETJava-.NET interoperability tools

45. IKVM.net – usage scenariosUse as typical Java Virtual Machine (JVM)Use Java libraries in .ΝΕΤ applicationsDevelop .NET applications in Java language

46. IKVM.net – usage scenariosUse as typicalJava Virtual Machine (JVM)Drop-in replacement:java -jar myapp.jarikvm -jar myapp.jar

47. IKVM.net – usage scenariosUse Java libraries in.ΝΕΤ applicationsikvmc = Java bytecode  .NET ILikvmc -target:library mylib.jarmylib.dllπ.χ. Apache FOP = XSL-FO processor (XML  PDF)

48. IKVM.net – usage scenariosDevelop .NET applicationsin Java languageikvmc = Java bytecode  .NET ILikvmc -target:exe myapp.jarmyapp.exe

49. IKVM.netCall .NET API from Java(inIKVM.net JVM)ikvmstub = Java stubs from .NETAPIikvmstub mscorlib.dll mscorlib.jarikvmstub c:\lib\mylib.dll

50. IKVM.net – integration / toolsMono (OpenSource .NET by Novell)MonoDevelop (IDE)Ant (task for ikvmc)Jar2ikvmc(folder of dependentJARs)

51. IKVM.netintegrationAnt task for ikvmc <ikvmc target="exe" out="hello.exe" home="c:/ikvm-0.36.0.11" version="1.0.0.0“ debug="true“ main="net.sf.ant-ikvmc.Hello"> <fileset dir="${build}"> <include name="**/*.class"/> </fileset> <fileset dir="${lib}"> <include name="**/*.jar"/> </fileset></ikvmc>

52. IKVM.netintegrationJar2ikvmc(folder of dependentJARs)jar2ikvmc.exe JFreeChart JFreeChart2Net.cmd ikvmc swtgraphics2d.jar -target:library ikvmc servlet.jar -target:library ikvmc junit.jar -target:library ikvmc jcommon-1.0.10.jar -target:library ikvmc gnujaxp.jar -target:library ikvmc itext-2.0.2.jar -target:library -r:gnujaxp.dllikvmc jfreechart-1.0.6.jar -target:library -r:jcommon-1.0.10.dll->-r:servlet.dll -r:gnujaxp.dll...

53. Web ServicesRestlet (Java web framework)Expose/Consume RESTful web APIsJava Web Services Stack (Metro)JAX-WS (Java API for XML Web Services)JAXB (Java Architecture for XML Binding)WSIT (Web Services Interoperability Technologies [aka Project Tango])WSIT (Tango) corresponds to WCF (Indigo)

54. Web Services for Remote PortletsPortlet = interactive application component, produces markup segments, aggregated and presented inportalsWSRP = interactive web servicesfocused to presentationcontent & apps: discoverable & pluggable

55. Web Services for Remote PortletsWhy WSRPinstead of simple Web Services?LocalizationMime typesPortlet modes (edit, help, view, custom)Window states (minimized, maximized, solo, normal)

56. Web Services for Remote PortletsWhy remoteportlets?Ease of configurationPlatform independenceScalability

57. Web Services for Remote PortletsWSRP ProducerWeb ServiceProvides 1 or morePortletsImplements WSRP interfaces/operationsCan provideruntime (container) fordeploying/management of>1 portlet

58. Web Services for Remote PortletsWSRP ConsumerWeb Service clientUsually aportalCalls producer WSRP web servicesProvides environment to interact withportlets theProducers provide

59. Web Services for Remote PortletsProducers (.NET  WSRP)NetUnitySharePoint WSRP ProducerOracle WebCenter .NET AcceleratorConsumers (WSRP  .NET)Microsoft WSRP Toolkit - SharePoint 2007NetUnity WSRP Consumer for SharePointNetUnity WSRP .NET Consumer

60. References (1)C# andJava comparison (Wikipedia)http://en.wikipedia.org/wiki/Comparison_of_C_Sharp_and_JavaAnders Hejlsberg (Wikipedia)http://en.wikipedia.org/wiki/Anders_HeljsbergJava ISO pull-out (ECMA fast track to ISO)http://www.crn.com/news/channel-programs/18806978/sun-drops-iso-java-standards-effort-for-good.htmOracle vs Google Android (Dalvik VM)http://www.businessweek.com/news/2010-08-13/oracle-says-google-android-violates-its-java-patents.htmlReferences (2)Java Native Interface (JNI)http://download.oracle.com/javase/6/docs/technotes/guides/jni/spec/jniTOC.htmlJACOBhttp://sourceforge.net/projects/jacob-projectjacoZoomhttp://www.infozoom.de/en_jacoZoom.shtmlJ-Integrahttp://j-integra.intrinsyc.comReferences (3)COMConnecthttp://sourceforge.net/projects/comconnectjni4nethttp://jni4net.sourceforge.netJNBridgeProhttp://www.jnbridge.com

61. http://www.jnbridge.com/jnbpro.htmEZ JComhttp://www.ezjcom.com

62. http://www.ezjcom.com/java.net.htmlReferences (4)Java Plug-in (JavaBeans Bridge for ActiveX)http://www.oracle.com/technetwork/java/index-jsp-141438.html

63. http://download.oracle.com/javase/1.4.2/docs/guide/beans/axbridge/developerguide/index.html

64. http://download.oracle.com/javase/1.4.2/docs/guide/beans/axbridge/developerguide/examples.htmlJava C# Bridgehttp://java-cs-bridge.sourceforge.netCaffeinehttp://caffeine.berlios.de/site

65. http://www.codeproject.com/KB/dotnet/Espresso.aspx

66. http://lsd.luminis.nl/java-net-interoperability/References (5)IKVM.nethttp://www.ikvm.net

67. http://sourceforge.net/apps/mediawiki/ikvm

68. http://ant-ikvmc.sourceforge.net

69. http://code.google.com/p/jar2ikvmc JDK, JavaFX SDK & NetBeans IDEhttp://www.oracle.com/technetwork/java/index.html

70. http://www.java.com (Java Runtime)References (6).NET Framework & Visual Studio IDEhttp://www.microsoft.com/net

71. http://msdn.microsoft.com/en-us/vstudio/default.aspx

72. http://www.microsoft.com/express

73. http://msdn.microsoft.com/en-us/library/ff649514.aspxMono & MonoDevelop IDEhttp://www.mono-project.comhttp://monodevelop.comEclipse Platform & IDEhttp://www.eclipse.orgReferences (7)Restlet (RESTful web framework for Java)http://www.restlet.orgJava Web Services Stack (Metro)http://www.oracle.com/technetwork/java/index-jsp-137004.htmlhttp://jax-ws.java.net (JAX-WS / JSR 224)https://jaxb.dev.java.net (JAXB/ JSR 222)http://wsit.java.net (WSIT)http://policy.dev.java.net (WS-Policy)http://xwss.dev.java.net (WS-Security)http://netbeans.org/images_www/articles/interviews/wsit-netbeans-plugin.htmlJava Portlet Specificationhttp://en.wikipedia.org/wiki/JSR_168/References (8)WSRP (Web Services for Remote Portlets)http://en.wikipedia.org/wiki/Web_Services_for_Remote_Portlets

74. http://www.ibm.com/developerworks/webservices/library/ws-wsrp

75. https://wsrp.dev.java.net

76. http://www.oasis-open.org/committees/tc_home.php?wg_abbrev=wsrp

77. http://www.oasis-open.org/committees/download.php/3343/oasis-200304-wsrp-specification-1.0.pdf

78. http://www.oasis-open.org/committees/download.php/21178/wsrp-primer-1.0.html

79. http://www.oasis-open.org/committees/download.php/11774/wsrp-faq-draft-0.30.htmlReferences (9)WSRP Toolkit for SharePoint 2007http://code.msdn.microsoft.com/WSRPToolkitNetUnity SharePoint & .NET WSRP Consumershttp://www.netunitysoftware.com/Home.aspx

80. Oracle WebCenter.NET Accelerator

81. http://blogs.oracle.com/fusionecm/2010/05/webcenter_net_accelerator_-_mi.html