为什么JSF 2.2需要花费更多时间在Wildfly上部分呈现ajax请求

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问题描述

我正在将项目从(在JBoss 4.2.3上运行的JSF 1.2，Richfaces 3.3.4)迁移到(在Wildfly 8.1.0上运行的JSF 2.2，Richfaces 4.5).在部分迁移了一些视图之后，我发现使用JSF 2的应用程序的性能很糟糕.

I am working on migrating a project from (JSF 1.2, Richfaces 3.3.4 running on JBoss 4.2.3) to (JSF 2.2, Richfaces 4.5 running on Wildfly 8.1.0). After partially migrating some views I found that the performance of the application using JSF 2 is terrible.

发送ajax请求时，我注意到了这个问题，尽管render属性指向一个outputText，但JSF 2正在呈现整个视图

I noticed this issue when an ajax request is sent, JSF 2 is rendering the whole view although the render attribute is pointing to one outputText

示例(可以从 HERE 下载)

在我的示例中，我将对JSF 1.2和2.2使用相同的代码示例.然后，我将多次单击ajax按钮，并使用Chrome检查工具测量每个请求的响应时间.

In my example I will use the same code sample for both JSF 1.2 and 2.2. Afterwards I will click on the ajax button multiple times and measure the response time for each request using chrome inspection tool.

使用JSF 1.2和Richfaces 3.3.4给出以下index1.XHTML

<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:a="http://richfaces.org/a4j">
    <head>
    </head>

    <body id="body">
        <!-- Later the outputText elements below will be included here-->
        <h:form>
            <a:commandButton value="TestBtn" reRender="output"/>
        </h:form>
        <h:outputText value="test" id="output"/>
    </body>
</html>

多次单击"TestBtn"，平均时间为15ms:

Clicking on "TestBtn" multiple times, the average time is 15ms:

使用JSF 2.2和Richfaces 4.5.0给出以下index2.XHTML

<html xmlns="http://www.w3.org/1999/xhtml"
      xmlns:h="http://java.sun.com/jsf/html"
      xmlns:a="http://richfaces.org/a4j">
    <h:head>
    </h:head>

    <h:body id="body">
        <!-- Later the outputText elements below will be included here-->
        <h:form>
            <a:commandButton value="TestBtn" render="output"/>
        </h:form>
        <h:outputText value="test" id="output"/>
    </h:body>
</html>

多次单击"TestBtn"，平均时间为18ms:

Clicking on "TestBtn" multiple times, the average time is 18ms:

好，到目前为止，一切都很好.现在，当我添加以下outputText元素时，就会出现性能问题

<h:outputText value="testingElement"/>
<h:outputText value="testingElement"/>
<h:outputText value="testingElement"/>
<h:outputText value="testingElement"/>
<h:outputText value="testingElement"/>
<h:outputText value="testingElement"/>
<h:outputText value="testingElement"/>
<h:outputText value="testingElement"/>
<h:outputText value="testingElement"/>
<h:outputText value="testingElement"/>
 ............. (300 times, of course this is just for testing purposes)

我在index1.xhtml和index2.xhtml中将这些元素添加了300次，并重复了相同的测试

I added these element 300 times in both index1.xhtml and index2.xhtml and repeated the same tests

使用index1.xhtml(JSF 1.2)的结果，我得到的平均时间为19ms

The results using index1.xhtml (JSF 1.2), I got average time of 19ms

使用index2.xhtml(JSF 2.2)的结果，我得到的平均时间为150ms(!!!!!)

The results using index2.xhtml (JSF 2.2), I got average time of 150ms (!!!!!)

比JSF 1.2慢8倍

Which is 8 times slower than JSF 1.2

有人可以解释一下为什么JSF 2比JSF 1慢吗?以及如何提高性能?

Could someone explain please why JSF 2 is slower than JSF 1? and how can I improve the performance?

更新

用tomcat服务器上的元素测试JSF 2示例，我平均得到20ms的时间.我想这个问题是从Wildfly方面引起的.

Testing out JSF 2 example with elements on a tomcat server, I got average 20ms. I guess the problem is caused from the Wildfly side.

不幸的是，我无法更改服务器.我应该找到让JSF 2在Wildfly上运行的解决方案.

Unfortuanlty I can't change servers. I should find a solution for JSF 2 to work on wildfly.

我试图升级到wildfly 8.2.0->仍然是相同的性能问题.

I tried to upgrade to wildfly 8.2.0 --> Still the same performance issue.

在谷歌搜索后我能找到的最接近的问题是这个 POST

The closest problem I could find after googling is this POST

因此我将JDK升级到jdk1.7.0_71->仍然存在相同的性能问题.

So I upgraded my JDK to jdk1.7.0_71 --> Still the same performance issue.

更新2

这是发送到Wildfly服务器的ajax请求(单击一次)的日志. (LOG)

Here is a log for an ajax request (for one click) sent to Wildfly server. (LOG)

尽管我只是重新渲染特定的ID，为什么JSF仍要构建整个视图?

Why is JSF building the whole view although I am only re-rendering a specific ID?

**注:我不知道这是JSF假定的工作方式，还是我只是在滥用它. **

** Note: I don't know if this is how JSF suppose to work or I am just misusing it. **

在此先感谢您，特法(Tefa)

Thanks in Advance,Tefa

推荐答案

我终于发现了为什么Wildfly的ajax响应仅对我缓慢.

I finally found out why the ajax response with Wildfly is slow for me only.

事实证明，此性能问题与JSF版本或mojarra版本无关.它实际上与Wildfly配置有关(需要具体说明)

在我的wildfly服务器中禁用了"org.jboss.as.weld".默认情况下，当您下载wildfly时，它已启用.这就是为什么没有人遇到任何性能问题的原因.

"org.jboss.as.weld" was disabled in my wildfly server. By default, when you download wildfly it is enabled. That's why no one was getting any performance issues.

要在Wildfly中启用/禁用焊接，只需从"{JBOSS_HOME}/standalone/configuration"(扩展名和子系统)中的standalone.xml中添加/删除以下两行:

To enable/disable weld in Wildfly just add/remove the following 2 lines from the standalone.xml found in "{JBOSS_HOME}/standalone/configuration" (the extension and the subsystem):

<extensions>
    ..............
    <extension module="org.jboss.as.weld"/>
    ..............
</extensions>
<profile>
     ..............
    <subsystem xmlns="urn:jboss:domain:weld:2.0"/>
</profile>

如果删除焊缝并尝试我在问题中提到的示例，则应该延迟ajax响应

If you remove weld and try out the example I mentioned in my question, you should have a delay in ajax responses

我不知道为什么禁用焊接会导致此问题，但这是与当前问题无关的另一个问题.

I don't know why disabling weld causing this issue but this is different question not related to this current question.

希望这可能对某人有所帮助

Hope this might help someone

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