https://bz.apache.org/bugzilla/show_bug.cgi?id=63235
Bug ID: 63235
Summary: Defer potentially expensive
Charset.availableCharsets() call
Product: Tomcat 9
Version: 9.0.16
Hardware: PC
OS: Mac OS X 10.1
Status: NEW
Severity: normal
Priority: P2
Component: Catalina
Assignee: dev@tomcat.apache.org
Reporter: pw...@pivotal.io
Target Milestone: -----
The `org.apache.tomcat.util.buf.B2CConverter` class includes a static
`encodingToCharsetCache` map populated in a static initializer by calling
`Charset.availableCharsets()`.
This is quite an expensive operation and it may be unnecessary as calls to
`B2CConverter.getCharset` often use the standard `UTF-8` charset. Some local
testing shows that if we don't create the cache then we save 157 classes from
being loaded and improve startup time.
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