compiling java files when one depends on a jar

Natively Compiling Java Application Class Librariesġ0.1.3 Natively Compi ling Java Application Class Libraries Oracle Database Core Java Class Libraries This sections covers the following topics:

After compilation, the loadjava utility can be used to load the statically compiled libraries into Oracle Database, which are then shared between users, processes, and sessions. This static compilation approach provides a large, consistent performance gain, regardless of the number of users or the code paths traversed on the server. If so, then the accelerator uses the machine code library instead of interpreting the deployed Java code. At run time, accelerator checks if a Java package has been natively compiled. If incorrect, then no performance gain is realized.Īn accelerator natively compiles all Java code within a Java Archive (JAR) file to native shared libraries organized by a Java package, before run time. The benefits depend on how accurately the native compiler anticipates code branches and the next instruction. Provides JVM the ability to translate Java instructions just before they are needed by the application. The following table briefly describes the native compilers: Accelerators use an Ahead-Of-Time approach for recompiling the Java classes. Most Java virtual machines (JVMs) use Just-In-Time (JIT) compilers that convert Java bytecodes to native machine instructions when methods are called. However, because the native code is stored in a shared library, it is shared among all users of the database. Use of direct field access, as opposed to accessor methodsīecause Java bytecodes were designed to be compact, natively compiled code can be considerably larger than the original bytecode. The exact speed increase is dependent on several factors, including:

Native compilation provides a speed increase ranging from two to ten times the speed of the bytecode interpretation. Without native compilation, the Java code you load to the server is interpreted and the underlying core classes upon which your code relies, such as java.lang.*, are natively compiled. For example, you can natively compile code with CPU-intensive classes. To regain some of the performance loss, you can natively compile certain classes. Translating Java bytecodes into machine instructions degrades performance. To accomplish these goals, some execution performance was sacrificed. The Java language was designed for a platform-independent and secure development model.

Compiling java files when one depends on a jar