Using Java Reflection you can get information about the class fields and get and set field values at run time. In Java Reflection API there is a class java.lang.reflect.Field that has methods for accessing field’s type, field’s modifier and setting and getting values of a field. Table of contents Getting…
In this post we’ll see how to invoke getters and setters using reflection in Java. For calling get() and set() methods of a class there are two ways in Java. 1. Using PropertyDescriptor class. 2. Search for get and set methods of the class and call it. Using PropertyDescriptor class…
In this post we’ll discuss the Serialization proxy pattern which is a more secure way to serialize an object by serializing a proxy object instead. Table of contents Need for serialization proxy pattern readResolve() and writeReplace() methods in Java Serialization proxy pattern Java example Need for serialization proxy pattern Serialization…
When your class implements Serializable interface, object serialization is automatic where you just need to call writeObject() and readObject() methods for serialization and deserialization. If you want to customize the serialization process with you having more control then you can use Externalizable interface in Java. Table of contents Externalizable interface…
When a class implements a Serializable interface you would have noticed this warning “The serializable class xxxx does not declare a static final serialVersionUID field of type long”. In this post we’ll see what is this serialVersionUID field and what is its significance with respect to serialization in Java. Table…
Serialization in Java is the process of converting state of the object into a byte stream and the reverse process of deserialization converts that byte stream (serialized form of object) back into a copy of the object. Because of this ability to persist an object, provided by serialization in Java,…
In this post we’ll see two of the interesting features of the concurrent API, Callable and Future in Java. Table of contents Callable in Java Callable interface Running a Callable task using ExecutorService Java Callable and Future example Future in Java Callable and Future example Callable in Java Consider a…
In this post we’ll discuss about java.lang.NoClassDefFoundError and how to fix it. When is NoClassDefFoundError in Java thrown NoClassDefFoundError in Java is thrown when a class is present at compile time but at runtime when the JVM or a ClassLoader instance tries to load in the definition of a class…
ClassNotFoundException in Java is thrown if an application tries to load a class but the class with the specified name is not found. java.lang.ClassNotFoundException ClassNotFoundException in Java is a checked exception which means it subclasses from Exception class (not from RuntimeException). This exception is thrown if you try to load…
In this post we’ll discuss about java.lang.UnsupportedClassVersionError and how to fix it. When is UnsupportedClassVersionError in Java thrown UnsupportedClassVersionError is thrown when the Java Virtual Machine attempts to read a class file whose major and minor version numbers are not supported by the current JVM version. To understand it better…
