Sign Up to our social questions and Answers Engine to ask questions, answer people’s questions, and connect with other people.
Login to our social questions & Answers Engine to ask questions answer people’s questions & connect with other people.
Lost your password? Please enter your email address. You will receive a link and will create a new password via email.
Please briefly explain why you feel this question should be reported.
Please briefly explain why you feel this answer should be reported.
Please briefly explain why you feel this user should be reported.
I am looking into integrating a JRE into a C++ application via JNI.
What is the overhead of holding a large number of references to Java objects within the C++ application (global references in JNI parlance)?
Are there any problems I should be aware of with this approach (other than the obvious, such as manually deallocating the references)?
(a) the overhead is the same as if you were doing it from Java. You are preventing the objects from being garbage-collected.
(b) Holding object references across JNI calls can be fatal to the JVM unless you do it correctly. You need to read carefully the section on Global and Local References in the JNI specification. You also need to consider using Weak References instead of global ones.