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..., wait, notify and notifyAll are dened as native methods. 4.6 Class loading The Java programming language denes times at which new classes should be loaded and their initialization code be executed =-=[16]-=-. What happens if class loading or initialization is attempted by the JVM while executing within a CCR? There are two options: Thesrst is to consider that such operations are performed in the context ...

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...those patterns to generate permissions for actual files in the expected way. 6 The Java class loader used to fetch those bytes can also be involved in determining the protection domain of those bytes =-=[13]-=-. Since new class loaders can be created at runtime, protection domains can be created dynamically, thereby helping to overcome the static nature of policy files. For a permission P , invoking the che...

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...compiled against, like those provided by Jiazzi with a unit's signature, type checking during class loader linking is implemented in the JVM with incremental whole-program analysis (using constraints =-=[17]-=-) and runtime checks (e.g., checking that abstract methods are implemented when invoked). Currently, component-based programs in Jiazzi must use a combination of Jiazzi and class loader linking. Many ...

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...ecessarily hard to write asynchronous code. In contrast, KaffeOS [7] does provide isolation for applications running on the same virtual machine. However, while KaffeOS builds on nested class loaders =-=[68]-=- to isolate the code of different applications, it still requires extensive modifications to the underlying virtual machine and, as a result, is not portable. Furthermore, while KaffeOS does allow for...

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...equently, at runtime, our browser code has twice the memory footprint, and it is very hard for the two loaded versions to interoperate. Furthermore, if our browser interacts with the class loader API =-=[19]-=-, it will need to use class Class and hiding it using import will not be possible. We may also wish to use the browser to observe source code outside of a running virtual machine. The problems mention...

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...Ò� Ò�Ñ� �ÝØ��℄ � �ÒØ Ó�� �ÒØ Ð�Ò � ÔÖÓØ� Ø�� ÚÓ�� Ö�×ÓÐÚ��Ð�×× �Ð�×× � � Figure 4: Java VM class loader The JVM resolves references to a class during runtime using a mechanism called the class loader =-=[31]-=-. A class loader is responsible for locating the definition of a class, which takes the form of a class file, and loading it into the JVM. A class in Java is, thus, defined by both its name and the cl...

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...spects of the Kaffe implementation that affect the performance that we can achieve with our KaffeOS prototype. 3.1 Namespaces Separate namespaces are provided in Java through the use of class loaders =-=[26]-=-. A class loader is an object that acts as a name server for classes. We use the Java class loading mechanism to provide KaffeOS processes with different namespaces. This use of Java class loaders is ...

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...ame to be associated with different class types at different points in time. Recall that a Java class type is uniquely determined by the combination of a class loader and a fully qualified class name =-=[18]. In-=- response to changes in the deployment directory, JBoss instantiates class loaders to dynamically define new class types, which may correspond to “new versions” of previously defined class types. ...