Feature/cleanup (#642)

* GIT compliance

* Simpler HashMap declaration

* Replaced usage of deprecated JsonMapper methods, removed unneeded null check

* Removed unused import

* Removed unused imports

Co-authored-by: Jim Anderson <jim.anderson@auth0.com>

EXAMPLES.md

@@ -127,4 +127,4 @@ RSAKeyProvider keyProvider = new RSAKeyProvider() {
 
 Algorithm algorithm = Algorithm.RSA256(keyProvider);
 //Use the Algorithm to create and verify JWTs.
-```
+```

LICENSE

@@ -18,4 +18,4 @@ FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-SOFTWARE.
+SOFTWARE.

lib/src/main/java/com/auth0/jwt/JWTCreator.java

@@ -7,6 +7,7 @@
 import com.fasterxml.jackson.core.JsonProcessingException;
 import com.fasterxml.jackson.databind.MapperFeature;
 import com.fasterxml.jackson.databind.ObjectMapper;
+import com.fasterxml.jackson.databind.json.JsonMapper;
 import com.fasterxml.jackson.databind.module.SimpleModule;
 
 import java.nio.charset.StandardCharsets;
@@ -31,12 +32,14 @@ public final class JWTCreator {
     private static final SimpleModule module;
 
     static {
-        mapper = new ObjectMapper();
         module = new SimpleModule();
         module.addSerializer(PayloadClaimsHolder.class, new PayloadSerializer());
         module.addSerializer(HeaderClaimsHolder.class, new HeaderSerializer());
-        mapper.registerModule(module);
-        mapper.configure(MapperFeature.SORT_PROPERTIES_ALPHABETICALLY, true);
+
+        mapper = JsonMapper.builder()
+                .configure(MapperFeature.SORT_PROPERTIES_ALPHABETICALLY, true)
+                .build()
+                .registerModule(module);
     }
 
     private JWTCreator(Algorithm algorithm, Map<String, Object> headerClaims, Map<String, Object> payloadClaims)
@@ -489,7 +492,7 @@ private static boolean validateClaim(Map<?, ?> map) {
                     return false;
                 }
 
-                if (entry.getKey() == null || !(entry.getKey() instanceof String)) {
+                if (!(entry.getKey() instanceof String)) {
                     return false;
                 }
             }

lib/src/main/java/com/auth0/jwt/algorithms/RSAAlgorithm.java

@@ -5,7 +5,6 @@
 import com.auth0.jwt.interfaces.DecodedJWT;
 import com.auth0.jwt.interfaces.RSAKeyProvider;
 
-import java.nio.charset.StandardCharsets;
 import java.security.InvalidKeyException;
 import java.security.NoSuchAlgorithmException;
 import java.security.SignatureException;

lib/src/main/java/com/auth0/jwt/impl/BasicHeader.java

@@ -37,7 +37,7 @@ class BasicHeader implements Header, Serializable {
         this.type = type;
         this.contentType = contentType;
         this.keyId = keyId;
-        this.tree = Collections.unmodifiableMap(tree == null ? new HashMap<String, JsonNode>() : tree);
+        this.tree = Collections.unmodifiableMap(tree == null ? new HashMap<>() : tree);
         this.objectReader = objectReader;
     }
 

lib/src/test/java/com/auth0/jwt/ConcurrentVerifyTest.java

@@ -10,14 +10,11 @@
 import org.junit.rules.ExpectedException;
 
 import java.security.interfaces.ECKey;
-import java.security.interfaces.ECPrivateKey;
-import java.security.interfaces.ECPublicKey;
 import java.security.interfaces.RSAKey;
 import java.util.Collections;
 import java.util.List;
 import java.util.concurrent.*;
 
-import static com.auth0.jwt.PemUtils.readPrivateKeyFromFile;
 import static com.auth0.jwt.PemUtils.readPublicKeyFromFile;
 
 //@Ignore("Skipping concurrency tests")

lib/src/test/java/com/auth0/jwt/JWTCreatorTest.java

@@ -16,9 +16,7 @@
 
 import static org.hamcrest.MatcherAssert.assertThat;
 import static org.hamcrest.Matchers.*;
-import static org.junit.Assert.assertNull;
 import static org.junit.Assert.assertTrue;
-import static org.mockito.ArgumentMatchers.eq;
 import static org.mockito.Mockito.mock;
 import static org.mockito.Mockito.when;
 

lib/src/test/java/com/auth0/jwt/algorithms/HMACAlgorithmTest.java

@@ -13,7 +13,6 @@
 import java.nio.charset.StandardCharsets;
 import java.security.InvalidKeyException;
 import java.security.NoSuchAlgorithmException;
-import java.util.Arrays;
 
 import static com.auth0.jwt.algorithms.CryptoTestHelper.asJWT;
 import static com.auth0.jwt.algorithms.CryptoTestHelper.assertSignaturePresent;

settings.gradle

@@ -8,4 +8,4 @@ pluginManagement {
 }
 
 include ':java-jwt'
-project(':java-jwt').projectDir = new File(rootProject.projectDir, '/lib')
+project(':java-jwt').projectDir = new File(rootProject.projectDir, '/lib')