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Figure 10.1 This diagram shows the major components of the J2EE class loader architecture, which takes advantage of loaders to enable deploying multiple enterprise applications into a single virtual machine. Each EAR file gets a separate loader; the application has a single EJB class loader; and each WAR file gets a loader of its own, which delegates to the EJB loader.
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separate class loader. Next, the application has a single EJB class loader, which delegates to the EAR class loader parent. All EJB in an EAR file are loaded through the same EJB class loader. Last, each web application or WAR file gets its own class loader, which delegates to the EJB class loader. The container loads classes stored in the ejb-jar or WAR files in their respective class loaders. JARs referenced in the Class-Path attribute in the MANIFEST.MF file of the EJB or WAR files are loaded in the EAR class loader. Essentially, a J2EE application shares all classes stored in referenced JAR files between all components of the J2EE application. EJB share the same class loader and thus the same classes as well. This means that two EJBs in the same application cannot have different versions of the same class file. If you need two versions of the same class, you must deploy them in separate EARs and access each via its remote interfaces. WARs, on the other hand, have dedicated class loaders. Two WAR files can have different versions of the same third-party JAR file stored in the lib directory (If the WAR file references the JAR in its Class-Path attribute, the JAR will be loaded into the EAR class loader and thus will be visible to both web applications.) Why would we want to share classes Sharing classes may or may not be desirable. If two components have unique copies of the same class, they cannot pass by reference. Trying to cast a class instance from one component to the next will result in a ClassCastException or even a ClassNotFoundException if the class isn t visible to the component s class loader. The only way to pass instances back and forth between two components is through serialization. Using a remote interface implicitly has this effect. On the other hand, having separate copies of a class can be desirable as well. If two components share the same class, they also share that class s static state. For example, in the case of the GoF Singleton pattern, both components would share the same instance. If you don t need or desire components to share the same instance, you should deploy them separately.
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10.2 Antipattern: System Loaded Application Classes
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Because deployment associated with class loaders is complex, you may be tempted to take the easy way out. When you put all classes on the global classpath, you are asking the system to load everything through the system class loader. However, don t take the path of least resistance. Storing application classes on the system classpath can lead to development and deployment problems and can often skirt real issues. First, as long as an instance of a class is present, that instance references its class, which in turn references its class loader. If a third-party library loaded through the system class path holds onto an instance of an application class, the EAR loader for that application can never get collected. If you try to hot deploy your application, the container would simply throw away the old EAR class loader and create a new one, and the third-party JAR would keep our loader from getting garbage collected. Essentially, you load two instances of your application at the same time. Each time you redeploy, the process will repeat until you run out of memory or another limited resource. Secondly, during development, if you make a change to a class loaded through the system class loader, you have to restart the entire application server. Restarting an application server can take many seconds and even minutes. If you develop and deploy frequently, these delays can add up quickly.
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