Life after Java - Reusing Code and Skills in a .NET world / presentation at ITProDevConnections 2010 - http://www.itprodevconnections.gr

1. Life after Java Reusing code and skills in a .NET world

2. Agenda Java- OOP language vsplatform Java vs C# Components & Controls vs JavaBeans PME (Property – Method – Event) model JUMP & J# Java – COM bridges IKVM.net Web Services WSRP : Web Services for Remote Portlets

3. Java as an OOPlanguage Inheritance, Polymorphism, Dynamic Class Loading, Exceptions... Great esteem and proved record at academia Multitude of related libraries and software, mainly OpenSource Lots of new programmers introduced to the Java language during their studies

4. Java as a platform Java 1.x –command line, AWT andApplets Java 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 priorities Sun Microsystems  Oracle JDeveloper vs NetBeans IDE Java Cloud, Java.net  Kenai Java.net Copyright issues Sun vs Microsoft (MSJVM) Oracle vs Google (Android Dalvik VM) No standardization by established international organisations (ISO pull-out)

6. Economics & work conditions: Competitive Fluctuating  Worker mobility Reuse: Code Skills Flexibility = invaluable ally

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

8. Components Unstructured Data Record = Structured, Addressable (Name, Pos) Data Object = Record + Methods to manipulate its data Component = Object + PME + Resources (Packaging) Agent = Component + (Internal) Logic / Program Loop

9. Controls / Widgets Control / Widget = User Interface Component JavaBeans: 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) Events Java: initially tightly-coupled (base classes / abstract methods), later on callback interfaces VB: method signatures (WithEvents) Object Pascal / Delphi: method variables C#: delegates

11. JUMP & J# (Microsoft) JUMP Import Java “projects” from Visual Studio Convert Java code toC# J# Java compiler  IL code, not Java bytecode Java datatype boxing Java 1.x class library, Swing & Collections API Up until Visual Studio 2005

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

13. Java – COM/.NET bridges (2) COMConnect Java  COM/.NET – stateful TCP, low latency Jni4net (OpenSource) intra-process, object oriented, JNI implementation JNBridgePro Visual Studio & Eclipse plugins, shared memory, sockets, network binary protocol, HTTP/SOAP EZ JCom Java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 query Caffeine (OpenSource) Hosting JVM in .NET Runtime,JNI OOP wrapper R-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 .NET Visually generate proxies: allow .Netaccess Java classes Link .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 Java Visually generate proxies: allow Java access .NET classes Reference Java proxy .JAR file from Java development project (place in build CLASSPATH) Write Java code to access .NET classes Edit 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 Framework Mono Components: Java Virtual Machine in .NET Java class librariesin .NET Java-.NET interoperability tools

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

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

47. IKVM.net – usage scenarios Use Java libraries in.ΝΕΤ applications ikvmc = Java bytecode  .NET IL ikvmc -target:library mylib.jar mylib.dll π.χ. Apache FOP = XSL-FO processor (XML  PDF)

48. IKVM.net – usage scenarios Develop .NET applicationsin Java language ikvmc = Java bytecode  .NET IL ikvmc -target:exe myapp.jar myapp.exe

49. IKVM.net Call .NET API from Java(inIKVM.net JVM) ikvmstub = Java stubs from .NETAPI ikvmstub mscorlib.dll mscorlib.jar ikvmstub c:ibylib.dll

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

51. IKVM.netintegration Ant 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.netintegration Jar2ikvmc(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 Services Restlet (Java web framework) Expose/Consume RESTful web APIs Java 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 Portlets Portlet = interactive application component, produces markup segments, aggregated and presented inportals WSRP = interactive web servicesfocused to presentation content & apps: discoverable & pluggable

55. Web Services for Remote Portlets Why WSRPinstead of simple Web Services? Localization Mime types Portlet modes (edit, help, view, custom) Window states (minimized, maximized, solo, normal)

56. Web Services for Remote Portlets Why remoteportlets? Ease of configuration Platform independence Scalability

57. Web Services for Remote Portlets WSRP Producer Web Service Provides 1 or morePortlets Implements WSRP interfaces/operations Can provideruntime (container) fordeploying/management of>1 portlet

58. Web Services for Remote Portlets WSRP Consumer Web Service client Usually aportal Calls producer WSRP web services Provides environment to interact withportlets theProducers provide

59. Web Services for Remote Portlets Producers (.NET  WSRP) NetUnitySharePoint WSRP Producer Oracle WebCenter .NET Accelerator Consumers (WSRP  .NET) Microsoft WSRP Toolkit - SharePoint 2007 NetUnity WSRP Consumer for SharePoint NetUnity WSRP .NET Consumer

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

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

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

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

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

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

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

80. Oracle WebCenter.NET Accelerator

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