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Editorial Team
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Asked: 2026-06-07T09:14:37+00:00

I am learning OSGi framework. What i found that Bundles consists of .class files

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I am learning OSGi framework. What i found that Bundles consists of .class files and manifest file. Now suppose I have two bundles A and B and bundle B depends on bundle A’s service. So while compiling bundle B i have to keep Bundle A’s service class in the classpath of bundle B or have to keep it(Bundle A’s service) inside bundle B so that compiler can compile. Now if we are doing so then how modularity is achieved and how the two bundles are independent. Please help.
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1 Answer

  1. Editorial Team

    Use interfaces!!

    You have in interface I. Class A implements I and therefore depends on it, both at compile time and at runtime. Class B uses an instance of I, which it obtains as an OSGi Service. Therefore B depends on I at compile time and at runtime.

    Therefore neither A nor B has direct knowledge of each other. Implementation code is hidden, only the interface is visible and shared. And that’s how modularity is achieved.

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