Unfortunately, this redefinition is limited only to changing method bodies.
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This meant that all objects could refer to an updated class and execute new code when their methods were called, preventing the need to reload a container whenever class bytecode was changed.
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It was incorporated within the Debugger API, and allowed debuggers to update class bytecode in place, using the same class identity. In 2002, Sun introduced a technology into the Java 1.4 JVM, called HotSwap.
Since the problem is quite apparent, especially when you work with larger applications, it received some attention a long time ago. It will crash with the out of memory errors. This is why you cannot just redeploy your application in the application server again and again all day. This is very often time consuming and quite vulnerable to memory leaks. This could mean recreating the whole application object graph by reinitializing the application, the configuration state etc., or copying over the user session state. You cannot map an existing object onto a new class, so it is important to migrate the state through reloads. To reload an application, you will actually need to create a new classloader, which in turn will load the latest version of the app classes. The identity of a class is the class name and classloader identity. Once a Java class has been loaded by a classloader, it is immutable and will last as long as the classloader itself. That is, when you call mo.method() (where mo is an instance of MyObject), the JVM will call mo.getClass().getDeclaredMethod("method").invoke(mo) (this is not what the JVM actually does, but you can think of it like this). When a method is called on an object, the JVM consults the class reference and calls the method of that particular class. In the Java API this identity is represented by an instance of can access it by using the MyObject.class expression.Įvery created object gets a reference to this identity, accessible through the Object.getClass() method. The class with all its methods is loaded into memory and receives a unique identity. Simplified, you can think of a class as a collection of methods that receive “this” as the first argument. The problem with reloading Java codeĪll Java code is associated with methods contained in classes. In reality, achieving this is way more complicated than it sounds. This way, when the JVM accesses the classes or objects of the changed classes next time, new code would already be in there. It would be much faster and easier if we could just reload the classes in the JVM with the new class definitions. Building, packaging and deploying is not necessary - rather an artifact of the platform than a necessity. Two of these phases are irrelevant to implementing the changes. You typically need to build your project, either fully or partially, tear down and restart the Java process running your code and load or deploy your application again. The problem is that the latter can take quite some time, especially with the Java stack. To implement a change in the app, you first need to code it up, then run the application and verify that the changes you just implemented are actually what you wanted them to be - functionally correct and working. The same is generally true for any technology stack. When dealing with Java application development, you go through several actions over and over again.
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What is even better, JRebel supports the majority of real-world enterprise Java stacks and is easy to install into your development environment. JRebel enables developers to get more done in the same amount of time and to stay in the flow while coding. It skips the rebuild, restart and redeploy cycle common in Java development. JRebel is a productivity tool that allows developers to reload code changes instantly. How JRebel can speed up your Java application development
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