This bug is to record an issue reportd by a customer to fix a performance degradation in JAXP xml transformations in JDK 5U14 as was caused by the bug fix: 6537909.
When ported the fix for 6537909 to jdk5, changes made in the fix for 6490921 since it was the basis for 6537909 and it's not in jdk5. However, the fix in 6490921 has a flaw. It meant to reuse the XMLReader instance, but ended up not. The problem was discovered when we worked other performance improvement which eventually led to jdk performance release 6u6.