src/java.base/share/classes/jdk/internal/org/objectweb/asm/util/TraceSignatureVisitor.java

@@ -68,11 +68,11 @@
  * @author Eugene Kuleshov
  * @author Eric Bruneton
  */
 public final class TraceSignatureVisitor extends SignatureVisitor {
 
-    private final StringBuffer declaration;
+    private final StringBuilder declaration;
 
     private boolean isInterface;
 
     private boolean seenFormalParameter;
 

@@ -80,13 +80,13 @@
 
     private boolean seenParameter;
 
     private boolean seenInterface;
 
-    private StringBuffer returnType;
+    private StringBuilder returnType;
 
-    private StringBuffer exceptions;
+    private StringBuilder exceptions;
 
     /**
      * Stack used to keep track of class types that have arguments. Each element
      * of this stack is a boolean encoded in one bit. The top of the stack is
      * the lowest order bit. Pushing false = *2, pushing true = *2+1, popping =

@@ -104,14 +104,14 @@
     private String separator = "";
 
     public TraceSignatureVisitor(final int access) {
         super(Opcodes.ASM5);
         isInterface = (access & Opcodes.ACC_INTERFACE) != 0;
-        this.declaration = new StringBuffer();
+        this.declaration = new StringBuilder();
     }
 
-    private TraceSignatureVisitor(final StringBuffer buf) {
+    private TraceSignatureVisitor(final StringBuilder buf) {
         super(Opcodes.ASM5);
         this.declaration = buf;
     }
 
     @Override

@@ -173,18 +173,18 @@
             seenParameter = false;
         } else {
             declaration.append('(');
         }
         declaration.append(')');
-        returnType = new StringBuffer();
+        returnType = new StringBuilder();
         return new TraceSignatureVisitor(returnType);
     }
 
     @Override
     public SignatureVisitor visitExceptionType() {
         if (exceptions == null) {
-            exceptions = new StringBuffer();
+            exceptions = new StringBuilder();
         } else {
             exceptions.append(", ");
         }
         // startType();
         return new TraceSignatureVisitor(exceptions);