Jawr CSSServlet抛出StackOverflowError

Question

我正在将一个使用Jawr的Hybris应用程序部署到Tomcat服务器。在启动时，JawrServlet抛出StackOverflow错误。

很难重现这个错误，但它总是发生在CSSServlet的处理过程中。在此记录后不久：

[JawrRequestHandler] Initializing jawr config for request handler named CSSServlet

下面是Servlet在我的web.xml中的配置方式：

     <servlet>
        <servlet-name>CSSServlet</servlet-name>
        <servlet-class>net.jawr.web.servlet.JawrServlet</servlet-class>

        <!-- Location in classpath of the config file -->
        <init-param>
            <param-name>configLocation</param-name>
            <param-value>/jawrsetup.properties</param-value>
            <!--<param-value>/jawrTEST.properties</param-value>-->
        </init-param>
        <init-param>
            <param-name>type</param-name>
            <param-value>css</param-value>
        </init-param>
        <init-param>
            <param-name>mapping</param-name>
            <param-value>/jawr-css</param-value>
        </init-param>
        <load-on-startup>1</load-on-startup>
    </servlet>

这是我的控制台日志中发生错误的一部分：

INFO   | jvm 1    | main    | 2013/01/29 11:20:16.081 | 11:20:16,036 [WrapperSimpleAppMain] DEBUG [Base64PostProcessorCssImageUrlRewriter] Skip encoding image resource : url('/images/bk-ruby/pause.png')
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.082 | 11:20:16,036 [WrapperSimpleAppMain] DEBUG [Base64PostProcessorCssImageUrlRewriter] Skip encoding image resource : url('/images/bk-ruby/pause-ie.png')
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.082 | 11:20:16,036 [WrapperSimpleAppMain] DEBUG [Base64PostProcessorCssImageUrlRewriter] Skip encoding image resource : url('/images/bk-ruby/left-hover.png')
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.087 | 11:20:16,036 [WrapperSimpleAppMain] DEBUG [Base64PostProcessorCssImageUrlRewriter] Skip encoding image resource : url('/images/bk-ruby/left-hover-ie.png')
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.087 | 11:20:16,036 [WrapperSimpleAppMain] DEBUG [Base64PostProcessorCssImageUrlRewriter] Skip encoding image resource : url('/images/bk-ruby/right-hover.png')
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.087 | 11:20:16,045 [WrapperSimpleAppMain] DEBUG [Base64PostProcessorCssImageUrlRewriter] Skip encoding image resource : url('/images/bk-ruby/right-hover-ie.png')
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.092 | 11:20:16,045 [WrapperSimpleAppMain] DEBUG [Base64PostProcessorCssImageUrlRewriter] Skip encoding image resource : url('/images/bk-ruby/play-hover.png')
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.092 | 11:20:16,045 [WrapperSimpleAppMain] DEBUG [Base64PostProcessorCssImageUrlRewriter] Skip encoding image resource : url('/images/bk-ruby/play-hover-ie.png')
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.092 | 11:20:16,045 [WrapperSimpleAppMain] DEBUG [Base64PostProcessorCssImageUrlRewriter] Skip encoding image resource : url('/images/bk-ruby/pause-hover.png')
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.093 | 11:20:16,045 [WrapperSimpleAppMain] DEBUG [Base64PostProcessorCssImageUrlRewriter] Skip encoding image resource : url('/images/bk-ruby/pause-hover-ie.png')
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.097 | 11:20:16,045 [WrapperSimpleAppMain] DEBUG [Base64PostProcessorCssImageUrlRewriter] Skip encoding image resource : url('/images/bg.png')
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.098 | 11:20:16,046 [WrapperSimpleAppMain] DEBUG [Base64PostProcessorCssImageUrlRewriter] Skip encoding image resource : url("/images/content-bg.png")
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.098 | 11:20:16,057 [WrapperSimpleAppMain] INFO  [Base64ImageEncoderPostProcessor] Base64 Postprocessing done
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.098 | 11:20:16,058 [WrapperSimpleAppMain] DEBUG [AbstractChainedResourceBundlePostProcessor] postprocessing bundle:/bundles/dmlights.css
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.198 | Jan 29, 2013 11:20:16 AM org.apache.catalina.core.ApplicationContext log
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.198 | SEVERE: StandardWrapper.Throwable
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.198 | java.lang.StackOverflowError
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.198 |     at java.util.regex.Pattern$LazyLoop.match(Unknown Source)
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.198 |     at java.util.regex.Pattern$GroupTail.match(Unknown Source)
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.198 |     at java.util.regex.Pattern$CharProperty.match(Unknown Source)
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.198 |     at java.util.regex.Pattern$Ques.match(Unknown Source)
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.198 |     at java.util.regex.Pattern$GroupHead.match(Unknown Source)
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.198 |     at java.util.regex.Pattern$LazyLoop.match(Unknown Source)
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.198 |     at java.util.regex.Pattern$GroupTail.match(Unknown Source)
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.198 |     at java.util.regex.Pattern$CharProperty.match(Unknown Source)
INFO   | jvm 1    | main    | 2013/01/29 11:20:16.198 |     at java.util.regex.Pattern$Ques.match(Unknown Source)

Answer 1

在我的CSS中，我有这样一个类定义，它可能导致了这个问题：

.our-price-indicated-pdp-acessories,
.our-price-indicated-cart-dropdown
{
    color: #6E6E6E;
    font-size: 11px;
    line-height: 15px;
    font-weight: bold;
    text-align: center;
}

因此，我将其更改为：

.our-priceind-pdpa,
.our-priceind-cartdrop{
    color: #6E6E6E;
    font-size: 11px;
    line-height: 15px;
    font-weight: bold;
    text-align: center;
}

而且它又起作用了。

但很难绝对确定。当类的名称非常长时，错误并不总是发生。如果你问我，整个问题是一个奇妙的心理扭曲。

我的建议是，看一看你的CSS，看看你是否有很长的类名，并尝试重新部署没有这些CSS类的应用程序。

Answer 2

我使用的是Jawr 3.3.3和Bootstrap 3.1.0，也遇到过同样的问题。解决方案是在bootstrap.css ie中做一个小的“修正”。更改：

a[href]:after {
    content: " (" attr(href) ")";
}
abbr[title]:after {
    content: " (" attr(title) ")";
}

至：

a[href]:after {
    content: " \0028" attr(href) "\0029";
}
abbr[title]:after {
    content: " \0028" attr(title) "\0029";
}

请注意，唯一改变的是开始和结束括号(以及它们的css代码副本)。

这样，语义保持不变，但jawr不会失败。:) (我很确定这是一个正则表达式造成的..)