diff --git a/pom.xml b/pom.xml
index b25d6d0..6192bc7 100644
--- a/pom.xml
+++ b/pom.xml
@@ -170,16 +170,16 @@
             <artifactId>bcprov-jdk18on</artifactId>
             <version>1.77</version>
         </dependency>
-        <dependency>
-            <groupId>info.picocli</groupId>
-            <artifactId>picocli</artifactId>
-            <version>4.5.2</version>
-        </dependency>
         <dependency>
             <groupId>commons-io</groupId>
             <artifactId>commons-io</artifactId>
             <version>2.11.0</version>
             <scope>test</scope>
         </dependency>
+        <dependency>
+            <groupId>info.picocli</groupId>
+            <artifactId>picocli</artifactId>
+            <version>4.5.2</version>
+        </dependency>
     </dependencies>
 </project>
diff --git a/src/main/java/sg/edu/ntu/sce/sands/crypto/BasicCommand.java b/src/main/java/sg/edu/ntu/sce/sands/crypto/BasicCommand.java
index 0aa1a6a..37f043e 100644
--- a/src/main/java/sg/edu/ntu/sce/sands/crypto/BasicCommand.java
+++ b/src/main/java/sg/edu/ntu/sce/sands/crypto/BasicCommand.java
@@ -77,7 +77,6 @@ public void validateFileOutput() {
     }
 
     static abstract class ForcibleCommand extends BasicCommand {
-
         @Option(names = { "-f", "--force" }, description = "Enables overwriting. Disabled by default")
         void setForceOverwrite(boolean forceFlag) {
             this.overwriteEnabled = forceFlag;
diff --git a/src/main/java/sg/edu/ntu/sce/sands/crypto/DCPABETool.java b/src/main/java/sg/edu/ntu/sce/sands/crypto/DCPABETool.java
index c18c795..d67442f 100644
--- a/src/main/java/sg/edu/ntu/sce/sands/crypto/DCPABETool.java
+++ b/src/main/java/sg/edu/ntu/sce/sands/crypto/DCPABETool.java
@@ -45,7 +45,6 @@
 	},
 	footer = {"","Run COMMAND --help for more information on a command."})
 public class DCPABETool implements Runnable {
-
 	@Spec CommandSpec commandSpec;
 
 	@Option(names = {"--version", "-V"}, versionHelp = true, description = "print version information and exit")
diff --git a/src/test/java/sg/edu/ntu/sce/sands/crypto/DCPABEToolTest.java b/src/test/java/sg/edu/ntu/sce/sands/crypto/DCPABEToolTest.java
index a057898..1ffcecc 100644
--- a/src/test/java/sg/edu/ntu/sce/sands/crypto/DCPABEToolTest.java
+++ b/src/test/java/sg/edu/ntu/sce/sands/crypto/DCPABEToolTest.java
@@ -11,10 +11,10 @@
 import java.io.PrintStream;
 import java.io.PrintWriter;
 import java.nio.file.Files;
-import java.nio.file.Path;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
+import java.util.Objects;
 import java.util.stream.Stream;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
@@ -43,7 +43,7 @@ public static void beforeAll() throws Exception {
         gpFile = Files.createTempFile("dcpabe", "gp").toFile();
         cmd = new CommandLine(new DCPABETool());
         cmd.execute("gsetup", "-f", gpFile.getPath());
-        resFile = new File(DCPABEToolTest.class.getResource("/testResource.txt").toURI());
+        resFile = new File(Objects.requireNonNull(DCPABEToolTest.class.getResource("/testResource.txt")).toURI());
     }
 
     @BeforeEach