Java reflection performance improvement10/29/2022 ![]() Note: To see a specific case study, watch AWS re:Invent 2019: Best practices for AWS Lambda and Java. Remove method breakpoints and consider using the. To optimize your Java Lambda function’s performance, you can implement one or more of the best practices outlined in this article. Method breakpoints will slow down debugger a lot because of the JVM design, they are expensive to evaluate. Consequently, reflective operations have slower performance than their non-reflective counterparts. Because reflection involves types that are dynamically resolved, certain JVM optimizations can’t be performed. ![]() Java reflection performance improvement code#The Java Reflection API allows Java code to discover information about other classes, interfaces, fields, and methods, and then operate on their underlying values. Currently, Apache Flink uses reflection to serialize Plain Old Java Objects (POJOs). the lambda support and performance improvements in other JVM languages, such as JRuby). In order to measure the gains of performance, I used the ever-awesome JMH (Java Microbenchmark Harness), which will likely be part of the JDK 12.As you may know, results are bound to the platform, so for reference I’ll be utilizing a single 1圆 i5-8600K 3.6GHz and Linux x8664 as well as Oracle JDK 8u191 and GraalVM EE 1.0.0-rc9. ![]() We use two methods for this purpose as described below before moving ahead as follows: Method 1: getDeclaredMethod (): It creates an object of the method to be. We can invoke a method through reflection if we know its name and parameter types. This delay can cause a high number of input-output (I/O) operations, which results in higher duration latencies for first invocations in a Lambda execution environment. Reflection was introduced in Java 1.1 (circa February 1997). The getMethods () method is used to get the public methods of the class to which an object belongs. This feature is extremely powerful and has no equivalent in other conventional languages such as C, C++, Fortran, or Pascal. ![]() To reduce memory usage, the JVM delays initializing a Java class library until the library is first called in an application. Java reflection is useful because it supports dynamic retrieval of information about classes and data structures by name, and allows for their manipulation within an executing Java program. Java virtual machine (JVM) lazy class loading There are two main factors that can contribute to high latency in a Java Lambda function: ![]()
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