Provide a SymbolTable with SoftReferences to avoid OutOfMemoryErrors
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Key: XERCESJ-1214
URL: http://issues.apache.org/jira/browse/XERCESJ-1214
Project: Xerces2-J
Issue Type: New Feature
Components: Other
Reporter: Peter McCracken
Assigned To: Peter McCracken
Priority: Minor
Fix For: 2.9.0
The standard org.apache.xerces.util.SymbolTable keeps strong references to its
String symbols, and provides no mechanism to eliminate symbolsonce added.
Although this is fine for most situations, if a SymbolTable is expected to have
a long lifetime and parse many dissimilar documents, or to parse documents
containing many different unique strings (possibly because of artificially
generated prefixes), then the SymbolTable can cause an OutOfMemoryError.
An alternate SymbolTable should be provided that keeps SoftReferences to its
symbols, so that OutOfMemoryErrors will never happen. The overhead of using
SoftReferences means that this should not become the default SymbolTable, but
it would be useful as an option for people encountering the above parsing
scenarios.
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