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INTRODUCTION
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tection supported by processes enables a high degree of fault isolation a crashed native application does not immediately terminate the Java application with which it communicates over TCP/IP Sometimes, however, you may nd it necessary for a Java application to communicate with native code that resides in the same process This is when the JNI becomes useful Consider, for example, the following scenarios: The Java API might not support certain host-dependent features needed by an application An application may want to perform, for example, special le operations that are not supported by the Java API, yet it is both cumbersome and inef cient to manipulate les through another process You may want to access an existing native library and are not willing to pay for the overhead of copying and transmitting data across different processes Loading the native library in the same process is much more ef cient Having an application span multiple processes could result in unacceptable memory footprint This is typically true if these processes need to reside on the same client machine Loading a native library into the existing process hosting the application requires less system resources than starting a new process and loading the library into that process You may want to implement a small portion of time-critical code in a lowerlevel language, such as assembly If a 3D-intensive application spends most of its time in graphics rendering, you may nd it necessary to write the core portion of a graphics library in assembly code to achieve maximum performance In summary, use the JNI if your Java application must interoperate with native code that resides in the same process
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The need for Java applications to interoperate with native code has been recognized since the very early days of the Java platform The rst release of the Java platform, Java Development Kit (JDK ) release 10, included a native method interface that allowed Java applications to call functions written in other languages such as C and C++ Many third-party applications, as well as the implementation of the Java class libraries (including, for example, javalang, javaio, and javanet), relied on the native method interface to access the features in the underlying host environment Unfortunately, the native method interface in JDK release 10 had two major problems:
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First, the native code accesses elds in objects as members of C structures However, the Java virtual machine speci cation does not de ne how objects are laid out in memory If a given Java virtual machine implementation lays out objects in a way other than that assumed by the native method interface, then you have to recompile the native method libraries Second, the native method interface in JDK release 10 relies on a conservative garbage collector because native methods can get hold of direct pointers to objects in the virtual machine Any virtual machine implementation that uses more advanced garbage collection algorithms cannot support the native method interface in JDK release 10 The JNI was designed to overcome these problems It is an interface that can be supported by all Java virtual machine implementations on a wide variety of host environments With the JNI: Each virtual machine implementor can support a larger body of native code Development tool vendors do not have to deal with different kinds of native method interfaces Most importantly, application programmers are able to write one version of their native code and this version will run on different implementations of the Java virtual machine The JNI was rst supported in JDK release 11 Internally, however, JDK release 11 still uses old-style native methods (as in JDK release 10) to implement the Java APIs This is no longer the case in Java 2 SDK release 12 (formerly known as JDK release 12) Native methods have been rewritten so that they conform to the JNI standard The JNI is the native interface supported by all Java virtual machine implementations From JDK release 11 on, you should program to the JNI The oldstyle native method interface is still supported in Java 2 SDK release 12, but will not (and cannot) be supported in advanced Java virtual machine implementations in the future Java 2 SDK release 12 contains a number of JNI enhancements The enhancements are backward compatible All future evolutions of JNI will maintain complete binary compatibility
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