reduce garbage creation

h2/src/main/org/h2/message/Trace.java

@@ -300,10 +300,10 @@ public class Trace {
         if (!space) {
             buff.append(' ');
         }
-        buff.append("*/").
-            append(StringUtils.javaEncode(sql)).
-            append(StringUtils.javaEncode(params)).
-            append(';');
+        buff.append("*/");
+        StringUtils.javaEncode(sql, buff);
+        StringUtils.javaEncode(params, buff);
+        buff.append(';');
         sql = buff.toString();
         traceWriter.write(TraceSystem.INFO, module, sql, null);
     }

h2/src/main/org/h2/util/StringUtils.java

@@ -148,8 +148,13 @@ public class StringUtils {
      * @return the Java representation
      */
     public static String javaEncode(String s) {
+        StringBuilder buff = new StringBuilder(s.length());
+        javaEncode(s, buff);
+        return buff.toString();
+    }
+
+    public static void javaEncode(String s, StringBuilder buff) {
         int length = s.length();
-        StringBuilder buff = new StringBuilder(length);
         for (int i = 0; i < length; i++) {
             char c = s.charAt(i);
             switch (c) {
@@ -202,7 +207,6 @@ public class StringUtils {
                 }
             }
         }
-        return buff.toString();
     }
 
     /**