diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
new file mode 100644
index 0000000..f1ac78e
--- /dev/null
+++ b/.github/workflows/build.yml
@@ -0,0 +1,37 @@
+name: SonarCloud
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+    types: [opened, synchronize, reopened]
+jobs:
+  build:
+    name: Build and analyze
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 0  # Shallow clones should be disabled for a better relevancy of analysis
+      - name: Set up JDK 11
+        uses: actions/setup-java@v1
+        with:
+          java-version: 11
+      - name: Cache SonarCloud packages
+        uses: actions/cache@v1
+        with:
+          path: ~/.sonar/cache
+          key: ${{ runner.os }}-sonar
+          restore-keys: ${{ runner.os }}-sonar
+      - name: Cache Gradle packages
+        uses: actions/cache@v1
+        with:
+          path: ~/.gradle/caches
+          key: ${{ runner.os }}-gradle-${{ hashFiles('**/*.gradle') }}
+          restore-keys: ${{ runner.os }}-gradle
+      - name: Build and analyze
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}  # Needed to get PR information, if any
+          SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
+        run: ./gradlew build sonarqube --info
+
diff --git a/build.gradle b/build.gradle
index 10c88ad..8e45d37 100644
--- a/build.gradle
+++ b/build.gradle
@@ -1,6 +1,15 @@
 plugins {
     id "java-library"
     id "com.github.johnrengelman.shadow" version "2.0.3" apply false
+    id "org.sonarqube" version "3.5.0.2730"
+}
+
+sonarqube {
+  properties {
+    property "sonar.projectKey", "viveknittmca_java-timeseries"
+    property "sonar.organization", "viveknittmca"
+    property "sonar.host.url", "https://sonarcloud.io"
+  }
 }
 
 compileJava {
diff --git a/timeseries/src/main/java/com/github/signaflo/data/visualization/Plots.java b/timeseries/src/main/java/com/github/signaflo/data/visualization/Plots.java
index c9209ce..0ab159a 100644
--- a/timeseries/src/main/java/com/github/signaflo/data/visualization/Plots.java
+++ b/timeseries/src/main/java/com/github/signaflo/data/visualization/Plots.java
@@ -99,8 +99,9 @@ public static void plot(final TimeSeries timeSeries, final String title, final S
             residualSeries.setXYSeriesRenderStyle(XYSeries.XYSeriesRenderStyle.Scatter);
             residualSeries.setMarker(new Circle()).setMarkerColor(Color.RED);
 
-            JPanel panel = new XChartPanel<>(chart);
             JFrame frame = new JFrame(title);
+            JPanel panel = new XChartPanel<>(chart);
+            
             frame.setDefaultCloseOperation(JFrame.DISPOSE_ON_CLOSE);
             frame.add(panel);
             frame.pack();
@@ -116,8 +117,9 @@ public static void plot(final TimeSeries timeSeries, final String title, final S
      * @param k the maximum lag to include in the acf plot.
      */
     public static void plotAcf(TimeSeries timeSeries, final int k) {
-        final double[] acf = timeSeries.autoCorrelationUpToLag(k);
         final double[] lags = new double[k + 1];
+        final double[] acf = timeSeries.autoCorrelationUpToLag(k);
+        
         for (int i = 1; i < lags.length; i++) {
             lags[i] = i;
         }