ConcurrentModificationException in JspConfig.findJspProperty

Issue

• We have a jsp-config in our web.xml and see the following ConcurrentModificationException sometimes when JSPs are compiled:

java.util.ConcurrentModificationException 
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:372) 
at java.util.AbstractList$Itr.next(AbstractList.java:343) 
at org.apache.jasper.compiler.JspConfig.findJspProperty(JspConfig.java:303) 
at org.apache.jasper.compiler.Compiler.generateJava(Compiler.java:112) 
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:333) 
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:313) 
at org.apache.jasper.compiler.Compiler.compile(Compiler.java:300) 
at org.apache.jasper.JspCompilationContext.compile(JspCompilationContext.java:585) 
at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:312) 
at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:322)