blocks|key|1558710|text|看看DCEVM，它是对HotSpot+VM的修改，允许在运行时进行无限的类重新定义。您可以在运行时添加/删除字段和方法，以及更改类的超类型。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1558711|原始站点上提供的二进制文件仅限于Java6u25和Java7的早期版本。该项目已在Github上派生，并支持Java7和8的最新版本。该维护者为Window/Linux上的32/64位虚拟机提供二进制文件。从Java11开始，该项目移动到了一个新的GitHub存储库，现在还为OS提供了二进制文件。|1558712|DCEVM是为Debian和Ubuntu打包的，它可以方便地与OpenJDK集成，并且可以通过java+-dcevm调用。包的名称取决于默认JDK的版本：|style|CODE|1558713|1558714|Debian7&8和Ubuntu15.04：openjdk-7-jre-dcevm|unordered-list-item|1558715|Debian+9和Ubuntu16.04：openjdk-8-jre-dcevm|1558716|Debian+10和Ubuntu19.04：openjdk-11-jre-dcevm|1558717|1558718|entityMap|0|LINK|mutability|MUTABLE|url|http://ssw.jku.at/dcevm|1|https://github.com/dcevm/dcevm|2|https://github.com/HotswapProjects/openjdk-jdk11-dcevm|3|https://packages.qa.debian.org/o/openjdk-7-jre-dcevm.html|4|https://packages.qa.debian.org/o/openjdk-8-jre-dcevm.html|5|https://packages.qa.debian.org/o/openjdk-11-jre-dcevm.html^0|2|5|0|0|15|6|1|3G|6|2|0|1B|B|0|0|M|J|3|0|L|J|4|0|M|K|5|0|0^^$0|@$1|2|3|4|5|6|7|1A|8|@]|9|@$A|1B|B|1C|1|1D]]|C|$]]|$1|D|3|E|5|6|7|1E|8|@]|9|@$A|1F|B|1G|1|1H]|$A|1I|B|1J|1|1K]]|C|$]]|$1|F|3|G|5|6|7|1L|8|@$A|1M|B|1N|H|I]]|9|@]|C|$]]|$1|J|3|-4|5|6|7|1O|8|@]|9|@]|C|$]]|$1|K|3|L|5|M|7|1P|8|@]|9|@$A|1Q|B|1R|1|1S]]|C|$]]|$1|N|3|O|5|M|7|1T|8|@]|9|@$A|1U|B|1V|1|1W]]|C|$]]|$1|P|3|Q|5|M|7|1X|8|@]|9|@$A|1Y|B|1Z|1|20]]|C|$]]|$1|R|3|-4|5|6|7|21|8|@]|9|@]|C|$]]|$1|S|3|-4|5|6|7|22|8|@]|9|@]|C|$]]]|T|$U|$5|V|W|X|C|$Y|Z]]|10|$5|V|W|X|C|$Y|11]]|12|$5|V|W|X|C|$Y|13]]|14|$5|V|W|X|C|$Y|15]]|16|$5|V|W|X|C|$Y|17]]|18|$5|V|W|X|C|$Y|19]]]]

Take a look at <a href="http://ssw.jku.at/dcevm" rel="nofollow noreferrer">DCEVM</a>, 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 <a href="https://github.com/dcevm/dcevm" rel="nofollow noreferrer">Github</a> 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 <a href="https://github.com/HotswapProjects/openjdk-jdk11-dcevm" rel="nofollow noreferrer">GitHub</a> 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 <code>java -dcevm</code>. The name of the package depends on the version of the default JDK:
<ul>
<li>Debian 7&amp;8 and Ubuntu 15.04 : <a href="https://packages.qa.debian.org/o/openjdk-7-jre-dcevm.html" rel="nofollow noreferrer">openjdk-7-jre-dcevm</a></li>
<li>Debian 9 and Ubuntu 16.04 : <a href="https://packages.qa.debian.org/o/openjdk-8-jre-dcevm.html" rel="nofollow noreferrer">openjdk-8-jre-dcevm</a></li>
<li>Debian 10 and Ubuntu 19.04 : <a href="https://packages.qa.debian.org/o/openjdk-11-jre-dcevm.html" rel="nofollow noreferrer">openjdk-11-jre-dcevm</a></li>
</ul>

blocks|key|5409937|text|Hotswap+Agent是对DCEVM的扩展，它支持许多Java框架(重载Spring+bean定义、Hibernate实体映射、记录器级别设置等)。|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|5409938|还有很多关于如何为Java1.7设置DCEVM和编译的二进制文件的文档。|5409939|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/HotswapProjects/HotswapAgent^0|0|D|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

<a href="https://github.com/HotswapProjects/HotswapAgent">Hotswap Agent</a> 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.

blocks|key|1562461|text|DCEVM支持增强的类重新定义，并可用于当前的JDK7和JDK8。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1562462|https://github.com/dcevm/dcevm/releases|offset|length|1562463|HotswapAgent是一个免费的JRebel替代品，在各种框架中都支持DCEVM。|1562464|http://hotswapagent.org/|1562465|entityMap|0|LINK|mutability|MUTABLE|url|1^0|0|0|13|0|0|0|0|O|1|0^^$0|@$1|2|3|4|5|6|7|R|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|S|8|@]|9|@$D|T|E|U|1|V]]|A|$]]|$1|F|3|G|5|6|7|W|8|@]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|J|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|K|$L|$5|M|N|O|A|$P|C]]|Q|$5|M|N|O|A|$P|I]]]]

DCEVM supports enhanced class redefinitions and is available for current JDK7 and JDK8.

<a href="https://github.com/dcevm/dcevm/releases" rel="noreferrer">https://github.com/dcevm/dcevm/releases</a>

HotswapAgent is an free JRebel alternative and supports DCEVM in various Frameworks.

<a href="http://hotswapagent.org/" rel="noreferrer">http://hotswapagent.org/</a>

blocks|key|3992080|text|由Spring+guys开发，用于Grails重新加载，但也适用于Java：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|3992081|https://github.com/SpringSource/spring-loaded|offset|length|3992082|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|19|0|0^^$0|@$1|2|3|4|5|6|7|M|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|N|8|@]|9|@$D|O|E|P|1|Q]]|A|$]]|$1|F|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|G|$H|$5|I|J|K|A|$L|C]]]]

By the Spring guys, used for Grails reloading but works with Java too:

<a href="https://github.com/SpringSource/spring-loaded" rel="noreferrer">https://github.com/SpringSource/spring-loaded</a>

blocks|key|1881928|text|我写了一篇关于DCEVM的文章：Spring-mvc+%2B+Velocity+%2B+DCEVM|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1881929|我认为这是值得的，因为我的环境运行起来没有任何问题。|1881930|entityMap|0|LINK|mutability|MUTABLE|url|http://ssw.jku.at/dcevm/|1|https://mufumbo.wordpress.com/2012/02/02/spring-mvc-velocity-dcevm/^0|7|5|0|G|T|1|0|0^^$0|@$1|2|3|4|5|6|7|P|8|@]|9|@$A|Q|B|R|1|S]|$A|T|B|U|1|V]]|C|$]]|$1|D|3|E|5|6|7|W|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|X|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]|N|$5|I|J|K|C|$L|O]]]]

I have written an article about <a href="http://ssw.jku.at/dcevm/" rel="nofollow noreferrer">DCEVM</a>: <a href="https://mufumbo.wordpress.com/2012/02/02/spring-mvc-velocity-dcevm/" rel="nofollow noreferrer">Spring-mvc + Velocity + DCEVM</a> 

I think it's worth it, since my environment is running without any problems.

blocks|key|1882011|text|我一直致力于一个开源项目，它允许您在热交换允许的基础上对类进行热替换：https://github.com/fakereplace/fakereplace|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1882012|它可能对你有用，也可能不起作用，但任何反馈都是值得感谢的。|1882013|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/fakereplace/fakereplace^0|Z|16|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@$A|O|B|P|1|Q]]|C|$]]|$1|D|3|E|5|6|7|R|8|@]|9|@]|C|$]]|$1|F|3|-4|5|6|7|S|8|@]|9|@]|C|$]]]|G|$H|$5|I|J|K|C|$L|M]]]]

I have been working on an open source project that allows you to hot replace classes over and above what hot swap allows: <a href="https://github.com/fakereplace/fakereplace" rel="noreferrer">https://github.com/fakereplace/fakereplace</a>

It may or may not work for you, but any feedback is appreciated

blocks|key|1882188|text|你可能想看看这个：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1882189|Java支持：|1882190|+HotSwap+VM的面向对象的体系结构支持一些高级特性，比如动态重定义类，即"HotSwap“。此功能提供了通过调试器API替换正在运行的应用程序中修改的代码的功能。HotSwap向Java+Platform+Debugger+Architecture添加了功能，支持在调试器控制下的执行期间更新类。它还允许通过在已插入分析代码的方法版本中进行热交换来执行分析操作。|blockquote|offset|length|style|BOLD|1882191|1882192|1882193|目前，这只允许在不重新启动应用程序的情况下重新部署新编译的方法体。您所要做的就是使用调试器运行它。我在Eclipse中试过了，它工作得很好。|1882194|此外，正如Emmanuel+Bourg在他的回答(JEP+159)中提到的那样，有希望支持添加超类型以及添加和删除方法和字段。|1882195|参考：Java+Whitepaper+135217:++Reliability,+Availability+and+Serviceability|1882196|entityMap|0|LINK|mutability|MUTABLE|url|http://openjdk.java.net/jeps/159|1|http://www.oracle.com/technetwork/java/whitepaper-135217.html#ras^0|0|0|42|13|0|0|0|0|1Y|0|0|1R|P|7|0|0|0|20|3|1X|1|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|14|8|@$G|15|H|16|I|J]]|9|@]|A|$]]|$1|K|3|-4|5|6|7|17|8|@]|9|@]|A|$]]|$1|L|3|-4|5|6|7|18|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|19|8|@$G|1A|H|1B|I|J]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1C|8|@$G|1D|H|1E|I|J]]|9|@$G|1F|H|1G|1|1H]]|A|$]]|$1|Q|3|R|5|6|7|1I|8|@$G|1J|H|1K|I|J]]|9|@$G|1L|H|1M|1|1N]]|A|$]]|$1|S|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]]|T|$U|$5|V|W|X|A|$Y|Z]]|10|$5|V|W|X|A|$Y|11]]]]

You might want to take a look this:

<blockquote>
 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.
</blockquote>

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 (<a href="http://openjdk.java.net/jeps/159" rel="nofollow">JEP 159</a>), there is hope to have support for the addition of supertypes and the addition and removal of methods and fields.

Reference:
<a href="http://www.oracle.com/technetwork/java/whitepaper-135217.html#ras" rel="nofollow">Java Whitepaper 135217: 
Reliability, Availability and Serviceability</a>

blocks|key|1882128|text|JRebel是免费的。别买了。选择“购买”页面上的“免费”选项(单选按钮)。然后选择“社交”。注册后，您将获得一个功能齐全的JRebel许可证密钥。然后，您可以下载JRebel或在您的IDE嵌入式版本中使用该密钥。你必须允许他们每月在你的FB时间表或Twitter账户上代表你张贴(广告)一次。我把我的twitter账号给了他们，没什么大不了的，我从来没用过它，我认识的人也没有真正用过它。所以节省260美元吧。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1882129|entityMap^0|0^^$0|@$1|2|3|4|5|6|7|D|8|@]|9|@]|A|$]]|$1|B|3|-4|5|6|7|E|8|@]|9|@]|A|$]]]|C|$]]

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.

JRebel allows for newly compiled code to be redeployed without restarting the application. I am wondering if there are any alternative (free?). The <a href="http://zeroturnaround.com/jrebel/faq/#3" rel="noreferrer">FAQ</a> 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.

Redeploy alternatives to JRebel

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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JRebel允许在不重新启动应用程序的情况下重新部署新编译的代码。我想知道是否有其他选择(免费？)。页面回答了这个问题，但我确信它偏向于JRebel。这个问题是一年前在这个网站上提出的，但我现在把它带回来看看是否有人有任何新的信息。顺便说一句，我真的很喜欢JRebel，但如果有免费的替代方案，我愿意尝试一下。另外要注意的是，我正在从事一个开源项目，他们为那些可以证明他们在开源项目上的人提供免费的一

问重新部署JRebel的替代方案
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