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- Update SDK and ACS versions - New article how to setup ATS in alfresco community - New troubleshooting section about configuring ATS
29 lines
2.2 KiB
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29 lines
2.2 KiB
Markdown
---
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Title: Hot reloading
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Added: v3.0.0
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Last reviewed: 2019-10-18
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---
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# Hot reloading
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Hot reloading in a Java project is the ability to avoid the infamous _change > restart and wait > check_ development lifecycle. This allows you to modify
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your application's code, and view the changes without having to restart Alfresco Content Services / Alfresco Share. You can potentially gain significant
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savings in development time that would otherwise be wasted rebuilding the Docker images and restarting the Docker containers.
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Hot reloading is a well known behaviour in several other languages (C# for example), and the most practical and fast lifecycle like Save&Reload should be
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possible. Hot reloading is the key to enabling [Rapid Application Development (RAD)](https://en.wikipedia.org/wiki/Rapid_application_development) and
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[Test Driven Development (TDD)](https://en.wikipedia.org/wiki/Test-driven_development).
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Since the Java 1.4 JVM, the Debugger API allowed debuggers to update class bytecode in place, using the same class identity. This meant that all objects
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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
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changed. All modern IDEs support it, including Eclipse, IntelliJ IDEA, and NetBeans. Since Java 5, this functionality has also been available directly to
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Java applications through the [Instrumentation API](http://docs.oracle.com/javase/6/docs/technotes/guides/instrumentation/index.html).
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In the Alfresco development lifecycle hot reloading is possible as in every other Java project (and with the same limitations). You can manage a project
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created with the Alfresco SDK using hot reloading through two different tools:
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* [JRebel](jrebel.md)
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* [HotSwapAgent](hotswap-agent.md)
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Both have advantages and disadvantages, so it's up to you to make the right choice for your needs. [JRebel](https://zeroturnaround.com/software/jrebel/) is a
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commercial product while [HotSwapAgent](http://hotswapagent.org/index.html) is open source. Both products can reload classes and web resources. However,
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JRebel is more powerful than HotSwapAgent and can also reload changes to the Spring XML context files, for example.
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