Redeploy alternatives to JRebel

Question

JRebel allows for newly compiled code to be redeployed without restarting the application   I am wondering if there are any alternative  free     The  FAQ page answers this question  but I am sure it s biased towards JRebel   This question was asked a year ago on this site  but I am bringing it back up to see if anyone has any new information   On a side note  I really like JRebel  but if there is a free alternative  I am willing to try it   One additional note  I am working on an open source project  and they offer free one year licenses to people who can prove they are on an open source project   Which works great for me  www kuali org   but I won t be on that project forever

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By the Spring guys  used for Grails reloading but works with Java too   https   github com SpringSource spring-loaded

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Hotswap Agent is an extension to DCEVM which supports many Java frameworks  reload Spring bean definition  Hibernate entity mapping  logger level setup          There is also lot of documentation how to setup DCEVM and compiled binaries for Java 1 7

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You might want to take a look this      HotSwap support  the object-oriented architecture of the Java HotSpot VM enables advanced features such as on-the-fly class redefinition  or  HotSwap   This feature provides the ability to substitute modified code in a running application through the debugger APIs  HotSwap adds functionality to the Java Platform Debugger Architecture  enabling a class to be updated during execution while under the control of a debugger  It also allows profiling operations to be performed by hotswapping in versions of methods in which profiling code has been inserted    For the moment  this only allows for newly compiled method body to be redeployed without restarting the application  All you have to do is to run it with a debugger  I tried it in Eclipse and it works splendidly   Also  as Emmanuel Bourg mentioned in his answer  JEP 159   there is hope to have support for the addition of supertypes and the addition and removal of methods and fields   Reference  Java Whitepaper 135217   Reliability  Availability and Serviceability

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I have been working on an open source project that allows you to hot replace classes over and above what hot swap allows  https   github com fakereplace fakereplace  It may or may not work for you  but any feedback is appreciated

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I have written an article about DCEVM  Spring-mvc   Velocity   DCEVM   I think it s worth it  since my environment is running without any problems

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DCEVM supports enhanced class redefinitions and is available for current JDK7 and JDK8   https   github com dcevm dcevm releases  HotswapAgent is an free JRebel alternative and supports DCEVM in various Frameworks   http   hotswapagent org

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Take a look at DCEVM  it s a modification of the HotSpot VM that allows unlimited class redefinitions at runtime  You can add remove fields and methods and change the super types of a class at runtime  The binaries available on the original site are limited to Java 6u25 and to early versions of Java 7  The project has been forked on Github and supports recent versions of Java 7 and 8  The maintainer provides binaries for 32 64 bits VMs on Windows Linux  Starting with Java 11 the project moved to a new GitHub repository and now also provides binaries for OS X  DCEVM is packaged for Debian and Ubuntu  it s conveniently integrated with OpenJDK and can be invoked with java -dcevm  The name of the package depends on the version of the default JDK   Debian 7 amp 8 and Ubuntu 15 04   openjdk-7-jre-dcevm Debian 9 and Ubuntu 16 04   openjdk-8-jre-dcevm Debian 10 and Ubuntu 19 04   openjdk-11-jre-dcevm

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JRebel is free  Don t buy it  Select the  free  option  radio button  on the  buy  page  Then select  Social   After you sign up  you will get a fully functional JRebel license key  You can then download JRebel or use the key in your IDEs embedded version  The catch   yes  there is a catch   you have to allow them to post on your behalf  advertise  once a month on your FB timeline or Twitter account  I gave them my twitter account  no biggie  I never use it and no one I know really uses it  So save  260

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