FULL PRODUCT VERSION :
java version "1.6.0_18"
Java(TM) SE Runtime Environment (build 1.6.0_18-b07)
Java HotSpot(TM) Client VM (build 16.0-b13, mixed mode)


FULL OS VERSION :
Red Hat Enterprise Linux AS release 4 (Nahant Update 8)
Linux adc2100591 2.6.9-89.0.0.0.1.ELxenU #1 SMP Tue May 19 04:48:26 EDT 2009 i686 i686 i386 GNU/Linux


A DESCRIPTION OF THE PROBLEM :
We run into a JDK bug that appears to be present in the JDK build 1.6.0_18-b07 that we're currently consuming in our WebLogic product stack, and the bug only seems to manifest itself in x86-based Red Hat Linux boxes.

ADF Faces/Apache Trinidad code that auto-generates CSS at runtime fails with StringIndexOutOfBoundsException because of this.  The problem goes away if we specify the JVM option -XX:-UseSSE42Intrinsics or -Djava.compiler=NONE when starting WebLogic.
  
We found a similar bug -- http://bugs.sun.com/view_bug.do?bug_id=6875866 that was apparently fixed in 6u18(b02).  So we shouldn't be running into this problem with 1.6.0_18-b07.  Also, the simple test case given in the mentioned bug does not reproduce.  Perhaps this is some edge case that the fix did not cover?
 


THE PROBLEM WAS REPRODUCIBLE WITH -Xint FLAG: Did not try

THE PROBLEM WAS REPRODUCIBLE WITH -server FLAG: Yes

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
No simple reproducible test case available.

ERROR MESSAGES/STACK TRACES THAT OCCUR :
java.lang.StringIndexOutOfBoundsException: String index out of range: -2
   at java.lang.String.substring(String.java:1937)
   at java.lang.String.substring(String.java:1904)
   at org.apache.myfaces.trinidadinternal.style.util.CSSGenerationUtils._getNSComponentSelector(CSSGenerationUtils.java:632)
   at org.apache.myfaces.trinidadinternal.style.util.CSSGenerationUtils.getNamespacedSelectors(CSSGenerationUtils.java:525)
   at org.apache.myfaces.trinidadinternal.style.cache.FileSystemStyleCache._getShortStyleClassMap(FileSystemStyleCache.java:1086)
   at org.apache.myfaces.trinidadinternal.style.cache.FileSystemStyleCache._getStyleSheetDocument(FileSystemStyleCache.java:652)
   at org.apache.myfaces.trinidadinternal.style.cache.FileSystemStyleCache._getEntry(FileSystemStyleCache.java:421)
   at org.apache.myfaces.trinidadinternal.style.cache.FileSystemStyleCache.getStyleSheetURIs(FileSystemStyleCache.java:177)
   at org.apache.myfaces.trinidadinternal.renderkit.core.xhtml.StyleSheetRenderer.encodeAll(StyleSheetRenderer.java:97)
   at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:335)
   at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:751)
   at org.apache.myfaces.trinidad.component.UIXComponentBase.__encodeRecursive(UIXComponentBase.java:1501)
   at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeAll(UIXComponentBase.java:771)
   at oracle.adfinternal.view.faces.renderkit.rich.DocumentRenderer._renderSkinStylesheet(DocumentRenderer.java:1835)
   at oracle.adfinternal.view.faces.renderkit.rich.DocumentRenderer.encodeAll(DocumentRenderer.java:781)
   at oracle.adf.view.rich.render.RichRenderer.encodeAll(RichRenderer.java:1369)
   at org.apache.myfaces.trinidad.render.CoreRenderer.encodeEnd(CoreRenderer.java:335)
   at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeEnd(UIXComponentBase.java:751)
   at org.apache.myfaces.trinidad.component.UIXComponentBase.__encodeRecursive(UIXComponentBase.java:1501)
   at org.apache.myfaces.trinidad.component.UIXComponentBase.encodeAll(UIXComponentBase.java:771)
   at javax.faces.component.UIComponent.encodeAll(UIComponent.java:942)
   at com.sun.faces.application.ViewHandlerImpl.doRenderView(ViewHandlerImpl.java:271)
   at com.sun.faces.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:202)
   at javax.faces.application.ViewHandlerWrapper.renderView(ViewHandlerWrapper.java:189)
   at org.apache.myfaces.trinidadinternal.application.ViewHandlerImpl.renderView(ViewHandlerImpl.java:193)
   at oracle.ocs.web.admin.fwk.adf.phase.RenderResponsePhaseListener.beforePhase(RenderResponsePhaseListener.java:98)
   at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl._executePhase(LifecycleImpl.java:258)
   at oracle.adfinternal.view.faces.lifecycle.LifecycleImpl.render(LifecycleImpl.java:205)
   at javax.faces.webapp.FacesServlet.service(FacesServlet.java:266)
   at weblogic.servlet.internal.StubSecurityHelper$ServletServiceAction.run(StubSecurityHelper.java:227)
   at weblogic.servlet.internal.StubSecurityHelper.invokeServlet(StubSecurityHelper.java:125)
   at weblogic.servlet.internal.ServletStubImpl.execute(ServletStubImpl.java:292)
   at weblogic.servlet.internal.TailFilter.doFilter(TailFilter.java:26)
   at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:56)
   at oracle.adfinternal.view.faces.webapp.rich.RegistrationFilter.doFilter(RegistrationFilter.java:97)


REPRODUCIBILITY :
This bug can be reproduced always.

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The Apache MyFaces Trinidad could is opensource and available at http://tinyurl.com/ydba4xk


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