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POHow to verify that a .jar or a class has been already loaded by the ClassLoader in Java
 

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  1. POHow to verify that a .jar or a class has been already loaded by the ClassLoader in Java
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    <p>.. i have an application (a .war) which have a plugin system where each pluggable plugin is a .jar with its .jar dependencies. And in the webapp, via an admin web interface, the plugins are loaded by using the ClassLoader which "loads" the .jar and its dependencies. But the problem is that, for example, 2 plugins A and B may have one or more common dependencies (commons-io.jar, commons-collection.jar, ...) ... so normally i should not load more that once the .jar which are already loaded by another plugin, or which was already present in the webapp itself -> WEB-INF/lib/ So, i would like to know if there's a way for not loading another time a .jar which was already loaded via the webapp or another plugin If possible, how must i do it !</p> <p>Actually, whatever the solution that is available, i just want to avoid classloader issues.</p> <p>NOTE: each plugin is a .zip file which have into it the following architecture</p> <p>plugin-name/</p> <pre><code> - code/ - A.class - B.class - ... - lib/ - commons-io.jar - log4j.jar - .... - description.xml - version.txt </code></pre> <p>each .class file in the directory code/ are loaded by the classloader, each .jar in the lib/ directory of the plugin is also loaded.</p> <p>But normally, i should not re-load the classes present in the .jar "commons-io.jar" if ever it was already present ...</p> <p>I hope i've been clear enough, thanks in advance for paying attention and helping.</p>
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    1. COIs it possible that two plugins will require different versions of the same dependency? Or is this not a concern?
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    2. COyes it is possible that 2 plugins have different versions of the same dependency
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