Use StringBuilder instead of StringBuffer (#10154)

2 files changed, 2 insertions, 2 deletions

diff --git a/buildhelpers/src/main/java/com/vaadin/buildhelpers/CompileTheme.java b/buildhelpers/src/main/java/com/vaadin/buildhelpers/CompileTheme.java
index 1c6b02268c..4cb5d70019 100644
--- a/buildhelpers/src/main/java/com/vaadin/buildhelpers/CompileTheme.java
+++ b/buildhelpers/src/main/java/com/vaadin/buildhelpers/CompileTheme.java
@@ -91,7 +91,7 @@ public class CompileTheme {
     private static void processSassTheme(String themeFolder, String themeName,
             String variant, String version) throws Exception {
 
-        StringBuffer cssHeader = new StringBuffer();
+        StringBuilder cssHeader = new StringBuilder();
 
         String stylesCssDir = themeFolder + File.separator + themeName
                 + File.separator;
diff --git a/buildhelpers/src/main/java/com/vaadin/buildhelpers/ManifestWriter.java b/buildhelpers/src/main/java/com/vaadin/buildhelpers/ManifestWriter.java
index fec19a4d05..c82303e3e1 100644
--- a/buildhelpers/src/main/java/com/vaadin/buildhelpers/ManifestWriter.java
+++ b/buildhelpers/src/main/java/com/vaadin/buildhelpers/ManifestWriter.java
@@ -26,7 +26,7 @@ import java.util.Date;
 import java.util.jar.Manifest;
 
 public class ManifestWriter {
-    StringBuffer buffer = new StringBuffer();
+    StringBuilder buffer = new StringBuilder();
 
     public ManifestWriter() {
     }