Replace StringBuffer with StringBuilder

Signed-off-by: Jonathan Coustick <jonathan.coustick@payara.fish>

impl/src/main/java/com/sun/el/parser/AstCompositeExpression.java

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021 Payara Services Ltd.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0, which is available at
@@ -37,7 +38,7 @@ public Class getType(EvaluationContext ctx) throws ELException {
 
     @Override
     public Object getValue(EvaluationContext ctx) throws ELException {
-        StringBuffer sb = new StringBuffer(16);
+        StringBuilder sb = new StringBuilder(16);
         Object obj = null;
         if (this.children != null) {
             for (int i = 0; i < this.children.length; i++) {

impl/src/main/java/com/sun/el/parser/AstLiteralExpression.java

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021 Payara Services Ltd.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0, which is available at
@@ -46,7 +47,7 @@ public void setImage(String image) {
             return;
         }
         int size = image.length();
-        StringBuffer buf = new StringBuffer(size);
+        StringBuilder buf = new StringBuilder(size);
         for (int i = 0; i < size; i++) {
             char c = image.charAt(i);
             if (c == '\\' && i + 1 < size) {

impl/src/main/java/com/sun/el/parser/AstString.java

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021 Payara Services Ltd.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0, which is available at
@@ -55,7 +56,7 @@ public void setImage(String image) {
             return;
         }
         int size = image.length();
-        StringBuffer buf = new StringBuffer(size);
+        StringBuilder buf = new StringBuilder(size);
         for (int i = 0; i < size; i++) {
             char c = image.charAt(i);
             if (c == '\\' && i + 1 < size) {

impl/src/main/java/com/sun/el/parser/ParseException.java

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021 Payara Services Ltd.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0, which is available at
@@ -139,7 +140,7 @@ public String getMessage() {
      * string literal.
      */
     protected String add_escapes(String str) {
-        StringBuffer retval = new StringBuffer();
+        StringBuilder retval = new StringBuilder();
         char ch;
         for (int i = 0; i < str.length(); i++) {
             switch (str.charAt(i)) {

impl/src/main/java/com/sun/el/parser/TokenMgrError.java

@@ -1,5 +1,6 @@
 /*
  * Copyright (c) 1997, 2018 Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2021 Payara Services Ltd.
  *
  * This program and the accompanying materials are made available under the
  * terms of the Eclipse Public License v. 2.0, which is available at
@@ -50,7 +51,7 @@ public class TokenMgrError extends Error {
      * Replaces unprintable characters by their espaced (or unicode escaped) equivalents in the given string
      */
     protected static final String addEscapes(String str) {
-        StringBuffer retval = new StringBuffer();
+        StringBuilder retval = new StringBuilder();
         char ch;
         for (int i = 0; i < str.length(); i++) {
             switch (str.charAt(i)) {