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JNBridge Updates Interoperability Tool


Java programs now can call .NET code directly

By Jennifer deJong
May 1, 2004 — 
Making it easier for developers to build applications that include both Java and .NET code, Boulder, Colo.-based JNBridge LLC announced last month version 2.0 of JNBridgePro.

New to 2.0 is the ability for Java programs to call .NET code directly, said JNBridge's CTO, Wayne Citrin. In the previous version, 1.4, programs created in .NET languages could call Java code, and Java could respond via callbacks-a scenario Citrin described as "one-and-a-half-way bridging." By contrast, 2.0 allows programs to make calls in both directions, at the same time. ".NET and Java are total partners" he said.

Until recently, the demand for Java programs to call .NET was relatively small, noted Citrin. But as .NET matures, a heterogeneous environment is the reality. "Software developers are creating new products that interface with both Java and .NET," he said.

JNBridgePro looks at the .NET code the Java developer wants to call-or the Java code the .NET developer wants to call-and automatically generates the code required to create the linkage, said Citrin.

It creates corresponding objects, where the .NET object looks like the Java object, and vice versa.

JNBridgePro is not integrated with the Java IDE used by the developer or with Visual Studio .NET, noted Citrin. "It is a side-by-side tool," he said.

Also new to 2.0 is the ability of .NET clients to discover more information about whom they are communicating with. "Am I talking to Java server A or Java server B?" asked Citrin. "The new version shows this."

In addition, 2.0 provides better garbage collection capabilities. "The developer no longer has to know that [Java and .NET have] different garbage collection mechanisms," said Citrin. When a .NET object is collected, the corresponding Java object is automatically collected, too.

JNBridgePro competes with Ja.NET, from Intrinsyc Software International Inc., in Vancouver, British Columbia. Both products use .NET Remoting, an object-oriented architecture for developing distributed applications, as the technical foundation. But JNBridgePro hides the technical details from the developer, said Citrin. For instance, when creating an object in Ja.NET, developers must specify the URL for the remote object to which it corresponds. In JNBridgePro, this isn't necessary. "It encapsulates the details of locating the remote object," said Citrin.

JNBridgePro standard edition, which supports J2SE, costs US$495 per developer, plus $95 for each desktop on which the application is deployed. The enterprise edition costs $2,495 per developer, plus $995 per server, or per 10 desktops on which the application is deployed.


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