Hi,
It looks as though you have discovered a concurrency bug. What is
the version of your installation?
If you feel like creating an issue on 
, that would be
great. I will look in to this.
A few questions:
Does it happen more often when there are a lot of users?
Just confirming the page is in /inline/ mode and not /preview/ or
/edit/? I ask because The log shows
"h.com/xwiki/bin/preview/Project" and the failing template is
"/templates/wysiwyginput.vm".
Thanks for the report.
Caleb
Matthew Hildebrand wrote:
  I am frequently (and randomly it seems) getting a 4001
error while
 parsing velocity page /templates/wysiwyginput.vm when loading pages for
 inline-edits.
 This is happening both on fields that have wiki-syntax (2.0) content and
 fields that while able to take wiki-syntax content, have only plain
 text. (i.e. "Lengthy, detailed information as needed. A good use of this
 would be training for new application features. This will be limited to
 text. If more is needed the user should be redirected to more detailed
 help documentation.")
 If the inline-edit page is immediately hard-refreshed (<CTRL>+<F5>), the
 message usually goes away and the correct content is displayed. However,
 users often don't notice the problem until 3-5 edits later, once the
 error message output has been saved to the field. (see log messages
 below)
 The setup that I have is:
 -- Page
     -- 1 Class Object of type A w/ multiple properties (incl. several
 textarea fields)
     -- Many Class Objects of type B w/ multiple properties (incl.
 several textarea fields)
     -- Many Class Objects of type C w/ multiple properties (incl.
 several textarea fields)
 The problem has occurred for objects from all three classes, and there
 doesn't seem to be any consistency as to which class/property it happens
 to.
 The biggest thing that I can't figure out is that for one load of the
 page it's fine, then it's broken, then (without changing the underlying
 data or code) it's fine again.
 Thanks!
 --Matt
 Here is the output from the catalina.out log file:
 2010-09-09 18:12:59,874
 [
http://xwiki.internal.nwresearch.com/xwiki/bin/preview/ProjectManagemen
 t/UseCase%2DAddEditDeleteListSystemUpdateNotifications] ERROR
 internal.DefaultHTMLConverter   - Can't find descriptor for the
 component [role = [org.xwiki.rendering.renderer.BlockRenderer] hint =
 [default]]
 org.xwiki.component.manager.ComponentLookupException: Can't find
 descriptor for the component [role =
 [org.xwiki.rendering.renderer.BlockRenderer] hint = [default]]
         at
 org.xwiki.component.embed.EmbeddableComponentManager.initialize(Embeddab
 leComponentManager.java:356)
         at
 org.xwiki.component.embed.EmbeddableComponentManager.lookup(EmbeddableCo
 mponentManager.java:109)
         at
 org.xwiki.component.internal.DefaultComponentManager.lookup(DefaultCompo
 nentManager.java:85)
         at
 com.xpn.xwiki.wysiwyg.server.converter.internal.DefaultHTMLConverter.fro
 mHTML(DefaultHTMLConverter.java:104)
         at
 com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(Conversion
 Filter.java:117)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:
 68)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestor
 erFilter.java:304)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodi
 ngFilter.java:112)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
 e.java:233)
         at
 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
 e.java:191)
         at
 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
 :127)
         at
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
 :102)
         at
 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
 java:109)
         at
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2
 98)
         at
 org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:85
 2)
         at
 org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(
 Http11Protocol.java:588)
         at
 org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
         at java.lang.Thread.run(Thread.java:619)
 2010-09-09 18:12:59,890
 [
http://xwiki.internal.nwresearch.com/xwiki/bin/preview/ProjectManagemen
 t/UseCase%2DAddEditDeleteListSystemUpdateNotifications] ERROR
 filter.ConversionFilter         - Exception while parsing HTML
 java.lang.RuntimeException: Exception while parsing HTML
         at
 com.xpn.xwiki.wysiwyg.server.converter.internal.DefaultHTMLConverter.fro
 mHTML(DefaultHTMLConverter.java:110)
         at
 com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(Conversion
 Filter.java:117)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:
 68)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestor
 erFilter.java:304)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodi
 ngFilter.java:112)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
 e.java:233)
         at
 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
 e.java:191)
         at
 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
 :127)
         at
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
 :102)
         at
 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
 java:109)
         at
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2
 98)
         at
 org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:85
 2)
         at
 org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(
 Http11Protocol.java:588)
         at
 org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
         at java.lang.Thread.run(Thread.java:619)
 Caused by: org.xwiki.component.manager.ComponentLookupException: Can't
 find descriptor for the component [role =
 [org.xwiki.rendering.renderer.BlockRenderer] hint = [default]]
         at
 org.xwiki.component.embed.EmbeddableComponentManager.initialize(Embeddab
 leComponentManager.java:356)
         at
 org.xwiki.component.embed.EmbeddableComponentManager.lookup(EmbeddableCo
 mponentManager.java:109)
         at
 org.xwiki.component.internal.DefaultComponentManager.lookup(DefaultCompo
 nentManager.java:85)
         at
 com.xpn.xwiki.wysiwyg.server.converter.internal.DefaultHTMLConverter.fro
 mHTML(DefaultHTMLConverter.java:104)
         ... 22 more
 org.xwiki.velocity.XWikiVelocityException: Failed to evaluate content
 with id [/templates/wysiwyginput.vm]
         at
 org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci
 tyEngine.java:200)
         at
 org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci
 tyEngine.java:156)
         at
 com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRendere
 r.java:116)
         at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1791)
         at com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:154)
         at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:224)
         at com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115)
         at
 org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr
 ocessor.java:431)
         at
 org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
 236)
         at
 org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
         at
 org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:617)
         at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:290)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:129)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(Conversion
 Filter.java:152)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:
 68)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestor
 erFilter.java:304)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodi
 ngFilter.java:112)
         at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235)
         at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206)
         at
 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
 e.java:233)
         at
 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
 e.java:191)
         at
 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
 :127)
         at
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
 :102)
         at
 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
 java:109)
         at
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2
 98)
         at
 org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:85
 2)
         at
 org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(
 Http11Protocol.java:588)
         at
 org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
         at java.lang.Thread.run(Thread.java:619)
 Caused by: org.apache.velocity.exception.VelocityException: Reference
 evaluation threw an exception at /templates/wysiwyginput.vm[line 57,
 column 7]
         at
 org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReferen
 ce.java:481)
         at
 org.apache.velocity.runtime.parser.node.ASTAndNode.evaluate(ASTAndNode.j
 ava:104)
         at
 org.apache.velocity.runtime.parser.node.ASTExpression.evaluate(ASTExpres
 sion.java:62)
         at
 org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState
 ment.java:85)
         at
 org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72
 )
         at
 org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState
 ment.java:87)
         at
 org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.jav
 a:336)
         at
 org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci
 tyEngine.java:191)
         ... 39 more
 Caused by: java.util.ConcurrentModificationException
         at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)
         at java.util.HashMap$EntryIterator.next(HashMap.java:834)
         at java.util.HashMap$EntryIterator.next(HashMap.java:832)
         at java.util.AbstractMap.toString(AbstractMap.java:485)
         at
 org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReferen
 ce.java:477)
         ... 46 more
 Here is the output that displays in the field:
 Error number 4001 in 4: Error while parsing velocity page
 /templates/wysiwyginput.vm Wrapped Exception: Failed to evaluate content
 with id [/templates/wysiwyginput.vm] (% id="xwikierror1" style="display:
 none;" %) ((( (% class="xwikierror" %) {{{Error number 4001 in 4: Error
 while parsing velocity page /templates/wysiwyginput.vm Wrapped
 Exception: Failed to evaluate content with id
 [/templates/wysiwyginput.vm] com.xpn.xwiki.XWikiException: Error number
 4001 in 4: Error while parsing velocity page /templates/wysiwyginput.vm
 Wrapped Exception: Failed to evaluate content with id
 [/templates/wysiwyginput.vm] at
 com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRendere
 r.java:122) at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1791) at
 com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:154) at
 com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:224) at
 com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115) at
 org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr
 ocessor.java:431) at
 org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
 236) at
 org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
 at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at
 javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:290) at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206) at
 com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:129) at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235) at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206) at
 com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(Conversion
 Filter.java:152) at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235) at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206) at
 com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:
 68) at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235) at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206) at
 com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestor
 erFilter.java:304) at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235) at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206) at
 com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodi
 ngFilter.java:112) at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235) at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206) at
 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
 e.java:233) at
 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
 e.java:191) at
 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
 :127) at
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
 :102) at
 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
 java:109) at
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2
 98) at
 org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:85
 2) at
 org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(
 Http11Protocol.java:588) at
 org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
 at java.lang.Thread.run(Thread.java:619) Wrapped Exception:
 org.apache.velocity.exception.VelocityException: Reference evaluation
 threw an exception at /templates/wysiwyginput.vm[line 57, column 7] at
 org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReferen
 ce.java:481) at
 org.apache.velocity.runtime.parser.node.ASTAndNode.evaluate(ASTAndNode.j
 ava:104) at
 org.apache.velocity.runtime.parser.node.ASTExpression.evaluate(ASTExpres
 sion.java:62) at
 org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState
 ment.java:85) at
 org.apache.velocity.runtime.parser.node.ASTBlock.render(ASTBlock.java:72
 ) at
 org.apache.velocity.runtime.parser.node.ASTIfStatement.render(ASTIfState
 ment.java:87) at
 org.apache.velocity.runtime.parser.node.SimpleNode.render(SimpleNode.jav
 a:336) at
 org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci
 tyEngine.java:191) at
 org.xwiki.velocity.internal.DefaultVelocityEngine.evaluate(DefaultVeloci
 tyEngine.java:156) at
 com.xpn.xwiki.render.XWikiVelocityRenderer.evaluate(XWikiVelocityRendere
 r.java:116) at com.xpn.xwiki.XWiki.evaluateTemplate(XWiki.java:1791) at
 com.xpn.xwiki.web.Utils.parseTemplate(Utils.java:154) at
 com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:224) at
 com.xpn.xwiki.web.XWikiAction.execute(XWikiAction.java:115) at
 org.apache.struts.action.RequestProcessor.processActionPerform(RequestPr
 ocessor.java:431) at
 org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:
 236) at
 org.apache.struts.action.ActionServlet.process(ActionServlet.java:1196)
 at org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:414)
 at javax.servlet.http.HttpServlet.service(HttpServlet.java:617) at
 javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:290) at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206) at
 com.xpn.xwiki.web.ActionFilter.doFilter(ActionFilter.java:129) at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235) at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206) at
 com.xpn.xwiki.wysiwyg.server.filter.ConversionFilter.doFilter(Conversion
 Filter.java:152) at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235) at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206) at
 com.xpn.xwiki.plugin.webdav.XWikiDavFilter.doFilter(XWikiDavFilter.java:
 68) at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235) at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206) at
 com.xpn.xwiki.web.SavedRequestRestorerFilter.doFilter(SavedRequestRestor
 erFilter.java:304) at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235) at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206) at
 com.xpn.xwiki.web.SetCharacterEncodingFilter.doFilter(SetCharacterEncodi
 ngFilter.java:112) at
 org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica
 tionFilterChain.java:235) at
 org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt
 erChain.java:206) at
 org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv
 e.java:233) at
 org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv
 e.java:191) at
 org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java
 :127) at
 org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java
 :102) at
 org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.
 java:109) at
 org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:2
 98) at
 org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:85
 2) at
 org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(
 Http11Protocol.java:588) at
 org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
 at java.lang.Thread.run(Thread.java:619) Caused by:
 java.util.ConcurrentModificationException at
 java.util.HashMap$HashIterator.nextEntry(HashMap.java:793) at
 java.util.HashMap$EntryIterator.next(HashMap.java:834) at
 java.util.HashMap$EntryIterator.next(HashMap.java:832) at
 java.util.AbstractMap.toString(AbstractMap.java:485) at
 org.apache.velocity.runtime.parser.node.ASTReference.evaluate(ASTReferen
 ce.java:477) ... 46 more }}} )))
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