removing a superclass), however, as I’ll describe it further in this post, it actually seems not to work.Īny type of further described changes could be done simply by attaching a debugger to a JVM and by using standard HCR feature present in most IDE-s.
#Jrebel alternative eclipse full version
The authors state that the full version can do more advanced operations, such as modifying class hierarchy (e.g. It’s really easy,painless and causes that every program running on JVM is able to do better HCR out of the box.ĭCEVM is precompiled for both java 1.7 and 1.8, however at the time of writing this post, the “full” version is available only for JVM 1.7. Therefore, the installation is a matter of replacing a standard JVM with DCEVM.Īfter starting the installer you simply choose which of current JVM installations you want to replace:Īs on output, you can notice that only jvm.dll-s were replaced with new ones. Instead, it’s actually a modified JVM, which could handle more of dynamic code change types. The significant difference with JRebel-like solutions is that it doesn’t work by dynamically modifying classes loaded by JVM. It solves most of the limitations of a standard JVM’s HCR.
When it comes to pure Hot Code Replace, DCEVM ( ) seems to be one of the most interesting tools. However, over the last few years things started to change and now we have a set of quite nice free tools which allow to reduce necessity of completely rebuilding and restarting our applications during development. For a long time there was no real alternative.
#Jrebel alternative eclipse software
Sure, there are commercial solutions available but as users of the Java software development ecosystem we are used to free and opensource solutions. Some containers / application servers offer kind of “hot redeploy” feature, however when it comes to replacing changed Java code, usually, it’s still necessary to restart the whole application, so it doesn’t help much in development. You cannot change a method signature, you cannot add fields, constants etc. The only thing that could be done is changing a method body. A standard JVM Hot Code Replace (HCR) doesn’t allow for too much.
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