Issue

Our application is running very slowly (i.e. poor performance), with many threads suck like this when viewing thread dumps:

"ajp-/10.1.2.40:8009-750" daemon prio=10 tid=0x000000004100a000 nid=0x5fb5 waiting for monitor entry [0x00007ff39881b000]
   java.lang.Thread.State: BLOCKED (on object monitor)
    at java.util.Vector.size(Vector.java:268)
    - waiting to lock <0x0000000405c469b8> (a java.util.Vector)
    at org.apache.xerces.impl.xpath.regex.Op$UnionOp.size(Unknown Source)
    at org.apache.xerces.impl.xpath.regex.RegularExpression.matchString(Unknown Source)
        ...
    at org.apache.xerces.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.parsers.XML11Configuration.parse(Unknown Source)
    at org.apache.xerces.jaxp.validation.StreamValidatorHelper.validate(Unknown Source)
    at org.apache.xerces.jaxp.validation.ValidatorImpl.validate(Unknown Source)
    at javax.xml.validation.Validator.validate(Validator.java:127)
        ...