Configuration property axis.xml.reuseParsers not documented - significant
performance boost
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Key: AXIS-2179
URL: http://issues.apache.org/jira/browse/AXIS-2179
Project: Apache Axis
Type: Bug
Components: Documentation
Versions: 1.2.1
Environment: JDK 1.5
Reporter: Eric Johnson
After noticing a performance bottleneck around creating new SAX parsers, I
noticed that the code creates a new one from the factory each time.
Digging into the code, I discovered that the XMLUtils.java class has some
static initialization to reuse parsers - cool - except the feature isn't in any
documentation that I could find, and it is turned off by default.
Before starting Tomcat, I did an "export
JAVA_OPTS=-Daxis.xml.reuseParsers=true", and got a 1.5-1.6 ms improvement, on
average for *each* SOAP invocation.
That's a huge improvement, as far as I'm concerned.
Being slightly unfamiliar with commons-discovery, I couldn't figure out how to
set this property except by using JVM-wide system properties. It would be
great to have documentation on that too.
Of course, it would be neat if the default for this functionality was *true*,
and the option was spurious, but I cannot tell immediately why that would be
unsafe. Barring that, documentation is essential.
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