https://bz.apache.org/bugzilla/show_bug.cgi?id=69429
Bug ID: 69429
Summary: Memory optimization to
AstMethodParameters.getParameters()
Product: Tomcat 9
Version: 9.0.x
Hardware: PC
Status: NEW
Severity: normal
Priority: P2
Component: Jasper
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: -----
Created attachment 39925
--> https://bz.apache.org/bugzilla/attachment.cgi?id=39925&action=edit
Patch
TestELParserPerformance.testExpressions() reveals an optimization to
AstMethodParameters.getParameters(), source code below:
public Object[] getParameters(EvaluationContext ctx) {
List<Object> params = new ArrayList<>();
for (int i = 0; i < this.jjtGetNumChildren(); i++) {
params.add(this.jjtGetChild(i).getValue(ctx));
}
return params.toArray(new Object[0]);
}
Reflective EL expressions with no parameters have this.jjtGetNumChildren == 0,
which is only tested after a new ArrayList<> has been allocated. An additional
Object[0] is allocated for return.
An early check of this.jjtGetNumChildren will eliminate these allocations for
reflective expressions with zero parameters. This behavior is similar to the
fast path implemented on https://bz.apache.org/bugzilla/show_bug.cgi?id=69381.
Patch file attached.
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