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EAR File Portability

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Is the EAR file expected to be portable according to J2EE specs? In other words, can I deploy an EAR file constructed by WebSphere's Application Assembly tool into WebLogic?
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No. It is not portable, each vendor had its own deployment descriptor.
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Well, the EAR file should be portable as far as development and application assembly is concerned. But will not be deployable as is in a different application server.
Some of the server specific configuration files shall have to be added / modified, the resource manager settings will be different and so on ..
For example if I have simpleGUI.ear in JBoss, I need to have the JBoss specific configuration file jboss.xml, whereas in Weblogic it will be welogic-ejb-jar.xml & weblogic-rdbms something .xml, for ATG J2EEDynamoSpecifier.xml.
But as far as I know, the application will not have to be rebuilt
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