java - Is DocumentBuilder thread safe? - Stack Overflow
See the comments section for other questions about the same matter. Short answer for your question: no, it's not ok to put these classes in a singleton. Neither DocumentBuilderFactory nor DocumentBuilder are guaranteed to be thread safe. If you have several threads parsing XML, make sure each thread has its own version of DoumentBuilder. You only need one of them per thread since you can reuse a DocumentBuilder after you reset it.
EDIT A small snippet to show that using same DocumentBuilder is bad. With java 1.6_u32 and 1.7_u05 this code fails with org.xml.sax.SAXException: FWK005 parse may not be called while parsing. Uncomment synchronization on builder, and it works fine:
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