In 2.3 HEAD I get a ConcurrentModificationException exception when removing parameter data from DynamicURI. Current DynamicURI (1.16) uses an ArrayList for pathInfo & queryString. Before version 1.11 a Vector was used. ArrayList is not threadsafe.
Stacktrace from my log file:
2003-03-29 21:08:43,864 ERROR org.apache.turbine.util.DynamicURI - Could not remove showAs
java.util.ConcurrentModificationException
at java.util.AbstractList$Itr.checkForComodification(AbstractList.java:444)
at java.util.AbstractList$Itr.next(AbstractList.java:421)
at org.apache.turbine.util.DynamicURI.remove(DynamicURI.java:668)
at org.apache.turbine.util.DynamicURI.removePathInfo(DynamicURI.java:725)
at ibanx.turbine.tools.LinkTool.setPathInfo(LinkTool.java:259)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
Snippet from ArrayList Javadoc:
<snip>
Note that this implementation is not synchronized. If multiple threads access an ArrayList instance concurrently, and at least one of the threads modifies the list structurally, it must be synchronized externally. (A structural modification is any operation that adds or deletes one or more elements, or explicitly resizes the backing array; merely setting the value of an element is not a structural modification.)
</snip>
One way to reproduce this behaviour is by using the following snippet in a velocity template:
$link.addPathInfo("test","x").removePathInfo("test")
An exception is thrown in the logfile.
Bart
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