K-Flakes # 2010-9: Approaches to interoperate java libraries with .Net application

Approaches to interoperate java libraries with .Net application 


Following can be the way to interoperate java libraries and .Net.

  1. In-proc Approach
The In-proc approach works by bringing together the .Net VM and Java VM into one process. The Java procedure calls .Net procedure via common area, like shared memory or through a communication channel. This approach is very efficient and optimized, but very complex underneath.

1.    Dynamically linking of Java libraries into .Net application.
IKVM.NET is an ongoing open-source project that translates Java bytecodes to MSIL as needed at runtime. IKVM.NET should allow any Java code to run on the .NET platform.

-        Open source project, available free of cost even for commercial usages (As per license agreement)
-        The most developed 3rd party API for Java-.Net interoperability.

Cons:
-        We need to test it thoroughly, as the project is still under development.
-        While online community support is available, there is no commercial support.

2.    JNI.NET (http://caffeine.berlios.de/site/index.html)
-        This is also an open source project, freely available.
-        We can consider this one among In-proc call, as its Beta version release is more promising than IKVM.NET.
-        Its architect is different and less complex as compared to IKVM.Net.
-        The beta version was released in 2004, so need to check if it works fine with Java 5 features.


3.    CodeMesh JuggerNet (http://www.codemesh.com/)  and JNBridge (http://www.jnbridge.com)
This is a commercial product with similar functionality to JNI.NET.


  1. Out-proc Approach
The Out-proc approach allows two different processes talk with each other through a channel understood by both the system. E.g. Java and .Net can communicate together using xml messages.

1.    Webservices
Web services are intended to provide a standards-based mechanism for allowing cross-platform components to interoperate.

- Web services are designed for loosely coupled interactions that are infrequent and coarse-grained: therefore they're not appropriate for applications that require frequent and fine-grained calls between Java and .NET classes.

- If you need to expose a rich interface for a large number of Java classes and objects, or you need to allow the .NET client process to create Java objects through the standard constructor (new) mechanism, Web services won't work.

- Web services use a SOAP-based communications mechanism that's inherently slower than alternative binary communications mechanisms.

- Web services are also not well-suited for passing custom objects between Java and .NET as parameters and return values.

  1. RPC (Remote Procedure Calls) with CORBA

The CORBA architecture provides us with common platform for remote procedure call between heterogeneous systems. However the java implementation of CORBA is freely available, very few .Net implementation are available.

    1. CORBA for .Net functionality is commercially available through MiddCor from MiddTec.
    2. Remoting.Corba (http://sourceforge.net/projects/remoting-corba/) is an open source project that aims to bring CORBA to .NET. It's still in beta phase.

  1. Using a shared database and messaging queue
This is a workaround alternative for designing applications in .Net and Java, which works together. On a broad level, one process put data/object into a middle layer (a database or messaging queue); while other process consume the data and vice-versa.

-        The approach is one of the simplest, but may not be suitable in many cases.
-        Requires additional middleware system, which will incur additional cost.


  1. Other Approaches

    1. Using Visual J#

-        .NET supports development of systems using multiple languages concurrently. One way to support Java/.NET interoperability is to translate the Java code directly into .NET's MSIL (Microsoft Intermediate Language) rather than into Java bytecodes.

-        Unfortunately, J# a significant limitation: it's legally limited to the Java supported by JDK 1.1.4 plus JDK1.2's collection classes. When the Java code you need uses more advanced features, including just about any J2EE feature such as EJBs or servlets, J# isn't a good choice.
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We forget that the water cycle and the life cycle are one.

Friends... I know this is an unusual post w.r.t the goal of this forum. But through this post, I would like to spread awareness about the current water problem across Globe, and I would term it as 'Slow-Coming Global Disaster'.

If we dont awake now, may be our next generation would find it difficult to see their next generation.
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We forget that the water cycle and the life cycle are one. – Jacques Cousteau

The biggest users of water on the islands are homes & tourist accommodations. Now some places in the US have no choice but to watch their water consumption because of drought. Here are some easy to follow tips to save water and money.

Kitchen Tips
1.      Soak pots and pans before washing. When washing dishes by hand, fill one sink or basin with soapy water.
2.      Fill the basin or a pan with water to wash fruits and vegetables.
3.      Keep a pitcher of water in the refrigerator rather than running tap water until it is cool enough to drink.
4.      When buying a new dishwasher, consider purchasing a water-saving model.
5.      Wash only full loads in the dishwasher.
Bathroom Tips
1.      Replace older, larger-use toilets with the newer ultra-low flush models.
2.      Do NOT use the toilet to dispose of paper, facial tissues, or cigarettes. Take a five-minute shower.
3.      Install a low-flow showerhead. It can save about half the amount of water you typically use in the shower, while still providing a refreshing, cleansing shower.
4.      Turn the tap water off while brushing your teeth,  shaving, or washing your face.
5.      If the toilet flush handle frequently sticks in the flush position, letting water run constantly, replace or adjust it.
Laundry Room Tips
1.      When buying a new clothes washer, consider purchasing a water-saving model. New horizontal axis models can save up to 40 percent of the water used by a conventional model.
2.      Wash only full loads in the clothes washer. 
Outdoor Tips
1.      Don't overwater your landscape. It can cause yellowing leaves or poor plant health.
2.      Using a running hose to wash your car can waste about 400 litres of water. Using a bucket with a sponge plus a trigger nozzle on the hose will save you about 300 of those litres.
3.      If you own a pool, be sure to use a pool cover when it's not in use. This will cut down on evaporation losses and will keep it cleaner and warmer.

Using some of these tips will surely save some water and hopefully some cash in the process.
Contents are compiled from different resources. Respective copyrights are acknowledged.
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