I’m deploying a Hybris application, which uses Jawr, to a Tomcat server. At start-up, JawrServlet throws a StackOverflow error.
It’s hard to reproduce the error, but it always happens during the processing of CSSServlet. Shortly after this is logged:
[JawrRequestHandler] Initializing jawr config for request handler named CSSServlet
This is how that Servlet is configured in my web.xml:
<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>
And here’s a part of my console’s log where the error happens:
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)
In my CSS I had this class definition that might have been causing the problem:
So I changed it to:
And it worked again.
But it’s hard to be absolutely sure. When the name of the class is really long, the error doesn’t Always happen. The whole problem is a fantastic mind twist if you ask me.
My advice is, have a look in your CSS and see if you have long class names and try to redeploy the application without those CSS classes.