Primitive types are - boolean, byte, short, int, long, char, float, and double. All the classes, enums, arrays are reference types and inherit from.
In java, every object is either a primitive type or reference.
#Java reflection nested field code#
This can be a serious security threat and cause your application to behave abnormally. Security Issues - Using reflection we can access part of code that we are not supposed to access, for example we can access private fields of a class and change it’s value.This can cause you application to fail at runtime because of security manager. Security Restrictions - Reflection requires runtime permissions that might not be available for system running under security manager.Poor Performance - Since java reflection resolve the types dynamically, it involves processing like scanning the classpath to find the class to load, causing slow performance.We should not use reflection in normal programming where we already have access to the classes and interfaces because of following drawbacks. The list is endless and they all use java reflection because all these frameworks have no knowledge and access of user defined classes, interfaces, their methods etc. Eclipse auto completion of method names.Tomcat web container to forward the request to correct module by parsing their web.xml files and request URI.Spring - dependency injection, read more at Spring Dependency Injection.JUnit - uses reflection to parse annotation to get the test methods and then invoke it.Some of the frameworks that use java reflection are: Reflection in Java is a very powerful concept and it’s of little use in normal programming but it’s the backbone for most of the Java, J2EE frameworks. We can also use reflection to instantiate an object, invoke it’s methods, change field values. Using java reflection we can inspect a class, interface, enum, get their structure, methods and fields information at runtime even though class is not accessible at compile time. Reflection in Java is one of the advance topic of core java. Java Reflection provides ability to inspect and modify the runtime behavior of application.
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