DateFormat.getDateTimeInstance() is very expensive, we can cache it to improve
performance
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Key: WW-3581
URL: https://issues.apache.org/jira/browse/WW-3581
Project: Struts 2
Issue Type: Improvement
Components: Core Actions
Affects Versions: 2.2.1
Reporter: Xiaoming Shi
Priority: Critical
In the file
./struts-2.2.1/src/xwork-core/src/main/java/com/opensymphony/xwork2/validator/AnnotationValidationConfigurationBuilder.java
line:547
DateFormat.getDateTimeInstance() is called 3 times for each function call of
"parseDateString"
We can add a class field to store the instances to improve performance.
Similar code can be found in
(./struts-2.2.1/src/xwork-core/src/main/java/com/opensymphony/xwork2/conversion/impl/XWorkBasicConverter.java
line: 323)
(Similar to the Appache Bug
https://issues.apache.org/bugzilla/show_bug.cgi?id=48778 )
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