Java reflection performance improvement code#
Consequently, reflective operations have slower performance than their non-reflective counterparts, and should be avoided in sections of code which are called frequently in performance-sensitive applications. By creating and reusing delegates, you can optimize your reflection code multiple times. But what does 'acceptable' really mean This is the question I asked when commenting on a performance review that advised to replace code based on. How would you improve performance of a Java application Pool valuable system resources like threads, database connections, socket connections etc. Older Java versions had huge performance overhead, while it seems that newer versions bring it in the acceptable range. Method Parameter Reflection (RFE: JDK-8004841): You can obtain the names of the formal parameters of any method or constructor with the method.
Quoting Java's documentation on reflection:īecause reflection involves types that are dynamically resolved, certain Java virtual machine optimizations can not be performed. In Java, it’s widely admitted that reflection - usage of the java.reflect API, comes at a high cost in terms of performance. Looking up a class via reflection is, by magnitude, more expensive. To use class information, it is important to search less class, field, method, caching, and to generate proxy classes. See the table of contents for my other blog posts from the conference This presentation is a lot of live coding with this kata.
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