Use native methods to expand the Java environment The JNI provides a recorded and reinforced requirements that allows applications published in other 'languages' to be known as from Java. ➢
Contacting Java from a software published in another terminology is also known as embedding, and the process needs an knowledge of the Invocation API. ➢
The JNI also provides a way for applications published in other 'languages' to call Java. ➢
Before you get too strong into our conversation, you can be provided with some qualifications on how local techniques proved helpful prior to the launch of the JNI. In short, before JDK 1.1 local techniques were difficult to use because: 
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The requirements did not interface to the Java Virtual Machine (VM) at playback for icon search. It was believed that signs would be in an include computer file and collected in at compile-time. Unfortunately, this is not the way item surroundings work with powerful connecting. This strategy also designed a chance for out-of-date resource information, and avoided powerful changes to principles at playback.
Java Environment
The interface for embedding was unexplained. There was no assistance for pinning (preventing garbage collection and activity of Java objects). Java post were transformed to suggestions without assistance for large personality places, making internationalization difficult. The nomenclature was really complicated.
Why do I need to use the JNI?
The conventional Java category collections do not assistance the platform-dependent functions essential to the applying. You might need to set some device-specific qualities under system control, or accessibility a device-specific API. You already have a collection published in another terminology, and wish to make it available for Java system code through the JNI.
JNI DIAGRAM
What does JNI allow me to do? Make, examine, and upgrade (including arrays and strings).
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Java
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If you are using the Invocation API for embedding you can take a two-dimensional range of post and successfully pass it to the Java system. If your C system is called from Java, you can make and come back an range of drifts or an range of post that will be recognized by the Java contacting technique.
Contact Java techniques âž”
The ability to a Java technique from C/C++ or Assembler is essential to the Invocation API. These JNI features allow us to fixed and non-static Java techniques with justifications. Capture and toss exclusions
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Good developers increase and catch exclusions. Using C/C++ or Assembler local program code to increase exclusions makes for more easy to understand programs.
Fill sessions and obtain category details âž”
A foreign-language system can demand details about the category being packed. Execute playback type verifying
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The factors are examined at playback, not statically as they were in the earlier implementation.
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