增加jetbrains.annotations.NotNull注释

pom.xml

@@ -78,6 +78,12 @@
             <groupId>com.fasterxml.jackson.core</groupId>
             <artifactId>jackson-databind</artifactId>
         </dependency>
+        <dependency>
+            <groupId>org.jetbrains</groupId>
+            <artifactId>annotations</artifactId>
+            <version>13.0</version>
+            <scope>compile</scope>
+        </dependency>
     </dependencies>
 
     <build>

src/main/java/co/jp/app/service/JwtService.java

@@ -5,6 +5,7 @@ import io.jsonwebtoken.security.Keys;
 import io.jsonwebtoken.security.SignatureException;
 import java.util.function.Function;
 
+import org.jetbrains.annotations.NotNull;
 import org.slf4j.Logger;
 import org.slf4j.LoggerFactory;
 import org.springframework.beans.factory.annotation.Value;
@@ -29,6 +30,7 @@ public class JwtService {
     @Value("${jwt.token-expiration-ms}")
     private long tokenExpirationMs;
 
+    @org.jetbrains.annotations.NotNull
     private Key getSignKey() {
         byte[] keyBytes = Base64.getDecoder().decode(secretKey);
         return Keys.hmacShaKeyFor(keyBytes);
@@ -46,7 +48,7 @@ public class JwtService {
         }
     }
 
-    public <T> T extractClaim(String token, Function<Claims, T> claimsResolver) {
+    public <T> T extractClaim(String token, @NotNull Function<Claims, T> claimsResolver) {
         final Claims claims = extractAllClaims(token);
         return claimsResolver.apply(claims);
     }
@@ -60,7 +62,7 @@ public class JwtService {
                 .getBody();
     }
 
-    public String generateToken(UserDetails userDetails) {
+    public String generateToken(@NotNull UserDetails userDetails) {
         Map<String, Object> claims = new HashMap<>();
         return createToken(claims, userDetails.getUsername());
     }