If thread limit is set to N, N+1 requests can be processed simmultaneousely. Every time the limit is crossed a new thread is created for the N+1st request and is destroyed after the processing is finished.

Proposed patch:

Index: /var/opt/apachews/trunk/common/src/main/java/org/apache/xmlrpc/util/ThreadPool.java
===================================================================
--- /var/opt/apachews/trunk/common/src/main/java/org/apache/xmlrpc/util/ThreadPool.java (revision 720508)
+++ /var/opt/apachews/trunk/common/src/main/java/org/apache/xmlrpc/util/ThreadPool.java (working copy)
@@ -153,7 +153,7 @@
         * might consider to use the {@link #addTask(ThreadPool.Task)} method instead.
         */
        public synchronized boolean startTask(Task pTask) {
- if (maxSize != 0 && runningThreads.size() > maxSize) {
+ if (maxSize != 0 && runningThreads.size() >= maxSize) {
                        return false;
                }
         Poolable poolable;