Top 10 Mavka review comments for Java
Digest: Top Comments for Java.
This post contains the top 10 comments in Java.
Comment 1
Bug: Potential loss of payment method information
In the getAvailablePaymentMethods method, there’s a risk of losing specific payment method information when mapping internal names to external names. If an internal payment method doesn’t have a corresponding entry in the internalToExternalPaymentMap, it’s replaced with a generic “Unknown Payment Method” string. This approach, while preventing null values, may lead to a loss of valuable information about new or uncommon payment methods.
Proposed solution: Instead of replacing unrecognized payment methods with a generic string, consider preserving the original method name while still logging a warning. This approach maintains all available information while alerting about unmapped payment methods. Here’s an example implementation:
public List<String> getAvailablePaymentMethods(String merchantId) {
return paymentGatewayClient.fetchPaymentMethods(merchantId)
.stream()
.map(method -> {
String externalName = internalToExternalPaymentMap.get(method);
if (externalName == null) {
logger.warn("Unmapped payment method encountered: {}", method);
return method; // Return the original method name
}
return externalName;
})
.collect(Collectors.toList());
}This solution ensures that all payment methods are included in the result, provides visibility into unmapped payment methods, and retains the original payment method names when no mapping exists. This approach allows for easier troubleshooting and future expansion of the payment method mapping.
Patch
@@ -25,6 +25,7 @@ import java.util.ArrayList;
import java.util.List;
import java.util.HashMap;
import java.util.stream.Collectors;
+import org.slf4j.LoggerFactory;
@Service
public class PaymentProcessingService {
@@ -32,6 +33,8 @@ public class PaymentProcessingService {
private final PaymentGatewayClient paymentGatewayClient;
private final Logger logger = LoggerFactory.getLogger(PaymentProcessingService.class);
+ private final HashMap<String, String> internalToExternalPaymentMap = new HashMap<>();
+
public PaymentProcessingService(PaymentGatewayClient paymentGatewayClient) {
this.paymentGatewayClient = paymentGatewayClient;
initializePaymentMap();
@@ -39,9 +42,21 @@ public class PaymentProcessingService {
private void initializePaymentMap() {
// Initialize the mapping
+ internalToExternalPaymentMap.put("CreditCardPayment", "Credit Card");
+ internalToExternalPaymentMap.put("MobileWalletPayment", "Mobile Wallet");
+ internalToExternalPaymentMap.put("InAppPurchase", "In-App Payment");
}
- public List<String> getAvailablePaymentMethods(String merchantId) {
- return paymentGatewayClient.fetchPaymentMethods(merchantId);
+ public List<String> getAvailablePaymentMethods(String merchantId) {
+ return paymentGatewayClient.fetchPaymentMethods(merchantId)
+ .stream()
+ .map(method -> {
+ String externalName = internalToExternalPaymentMap.get(method);
+ if (externalName == null) {
+ logger.warn("Unrecognized payment method: {}", method);
+ return "Unknown Payment Method";
+ }
+ return externalName;
+ })
+ .collect(Collectors.toList());
}
}
Comment 2
Bug: Inconsistent null handling in getter methods for formatted strings.
The getFormattedProductId() and getFormattedProductName() methods use Optional to handle null values and apply string formatting. However, getFormattedCategory() and getFormattedManufacturer() use a different approach with explicit null checks. This inconsistency can lead to confusion and potential bugs.
Solution: Standardize the null handling approach across
Patch
@@ -1,15 +1,18 @@
-import com.fasterxml.jackson.annotation.JsonIgnore;
-import com.fasterxml.jackson.annotation.JsonProperty;
-import com.golfmore.morebox.server.util.ReportUtil;
+import com.example.utils.StringFormatter;
import lombok.AllArgsConstructor;
import lombok.Builder;
import lombok.Data;
import lombok.NoArgsConstructor;
-import lombok.experimental.Accessors;
-import java.math.BigDecimal;
-import java.util.ArrayList;
-import java.util.List;
+import java.util.Optional;
-import static com.golfmore.morebox.server.util.ReportUtil.formatAmount;
-import static java.util.Objects.isNull;
+@Data
+@Builder
+@NoArgsConstructor
+@AllArgsConstructor
+public class ProductInfo {
+ private String productId;
+ private String productName;
+ private String category;
+ private String manufacturer;
-@Data
-@Builder
-@NoArgsConstructor
-@AllArgsConstructor
-public class TransactionalReportRequestDTO {
- private TransactionalData requestDTO;
-
- public TransactionalReportRequestDTO getRequestDTO() {
- return requestDTO;
+ public String getFormattedProductId() {
+ return Optional.ofNullable(productId)
+ .map(StringFormatter::truncate)
+ .orElse("");
}
- @Accessors(chain = true)
- @Data
- @NoArgsConstructor
- static public class TransactionalData {
- private String resource;
- private String clubName;
- private String name;
- private String categoryName;
- private BigDecimal amount;
-
- @JsonIgnore
- public String getAmountAsString() {
- return formatAmount(amount);
- }
-
- public String getResource() {
- String result = ReportUtil.cutLongStrings(resource);
- if (isNull(result)) {
- return "";
- }
- return result;
- }
-
- public String getClubName() {
- String result = ReportUtil.cutLongStrings(clubName);
- if (isNull(result)) {
- return "";
- }
- return result;
- }
-
- public String getName() {
- String result = ReportUtil.cutLongStrings(name);
- if (isNull(result)) {
- return "";
- }
- return result;
- }
+ public String getFormattedProductName() {
+ return Optional.ofNullable(productName)
+ .map(StringFormatter::truncate)
+ .orElse("");
+ }
- public String getCategoryName() {
- String result = ReportUtil.cutLongStrings(categoryName);
- if (isNull(result)) {
- return "";
- }
- return result;
- }
+ public String getFormattedCategory() {
+ if (category == null) return "";
+ return StringFormatter.truncate(category);
+ }
+
+ public String getFormattedManufacturer() {
+ if (manufacturer == null) return "";
+ return StringFormatter.truncate(manufacturer);
}
}
Comment 3
Issue: Unnecessary duplicate hide() invocation in dismissActiveNotification() function
In the dismissActiveNotification() method, there’s an unnecessary second call to hide() the notification popup. The popup is already hidden within the try block, but there’s another hide() call right after the catch block.
Fix: Eliminate the redundant hide() call following the catch block. The corrected code should be:
if (currentNotification.getPopup() != null
&& currentNotification.getPopup().isVisible()
&& currentNotification.getPopup().getOwner() != null) {
try {
currentNotification.getPopup().hide();
} catch (RuntimeException ex) {
LOGGER.warn("Failed to close notification: {}", currentNotification.getId(), ex);
}
// Remove this line:
// currentNotification.getPopup().hide();
} else {
LOGGER.debug("No visible popup for notification ID: {}", currentNotification.getId());
}This modification ensures that the hide() method is invoked only once and avoids potential complications that might occur from trying to hide a popup that has already been hidden.
Patch
@@ -45,7 +45,7 @@ public class NotificationCenter {
dismissActiveNotification();
}
- private void dismissActiveNotification() {
+ private synchronized void dismissActiveNotification() {
if (notifications.isEmpty()) {
return;
}
@@ -59,9 +59,14 @@ private void dismissActiveNotification() {
if (currentNotification.getPopup() != null
&& currentNotification.getPopup().isVisible()
&& currentNotification.getPopup().getOwner() != null) {
+ try {
+ currentNotification.getPopup().hide();
+ } catch (RuntimeException ex) {
+ LOGGER.warn("Failed to close notification: {}", currentNotification.getId(), ex);
+ }
currentNotification.getPopup().hide();
} else {
- LOGGER.debug("No visible popup for notification: {}", currentNotification);
+ LOGGER.debug("No visible popup for notification ID: {}", currentNotification.getId());
}
notifications.remove(currentNotification);
Comment 4
Bug: Potential endless loop in extractValidPacket() function
The modified code introduces a risk of an infinite loop in the extractValidPacket() function when the rawData list contains invalid data that doesn’t meet the VALID_PACKET_SIZE criteria. The while loop continuously removes elements and trims the data without verifying if the rawData size has fallen below VALID_PACKET_SIZE.
Fix:
Update the while loop condition to also check if the rawData size remains greater than or equal to VALID_PACKET_SIZE:
while (rawData.size() >= VALID_PACKET_SIZE) {
List<Byte> chunk = rawData.subList(0, VALID_PACKET_SIZE);
if (isPacketValid(chunk)) {
return List.copyOf(chunk);
}
LOG.warn("Chunk {} is invalid, searching for next chunk", chunk);
rawData.removeFirst();
removeLeadingJunkData();
if (rawData.size() < VALID_PACKET_SIZE) {
break;
}
}This change ensures that the loop will terminate if the rawData size becomes less than VALID_PACKET_SIZE, preventing an endless loop scenario.
Patch
@@ -42,12 +42,16 @@ private List<Byte> extractValidPacket() {
return List.copyOf(rawData);
}
if (dataLength > VALID_PACKET_SIZE) {
- List<Byte> chunk = rawData.subList(0, VALID_PACKET_SIZE);
- if (isPacketValid(chunk)) {
- return List.copyOf(chunk);
+ while(rawData.size() >= VALID_PACKET_SIZE) {
+ List<Byte> chunk = rawData.subList(0, VALID_PACKET_SIZE);
+ if (isPacketValid(chunk)) {
+ return List.copyOf(chunk);
+ }
+ LOG.warn("Chunk {} is invalid, searching for next chunk", chunk);
+ rawData.removeFirst();
+ removeLeadingJunkData();
}
- LOG.warn("Response is invalid, clearing buffer");
- clearBuffer();
+ LOG.warn("No valid chunks found in data");
}
return List.of();
}
Comment 5
Bug: The getJobName() and getEndpoint() methods are implemented to always return null. This could lead to problems with the PushGatewayConfig interface implementation, potentially causing unexpected behavior or errors when these methods are invoked.
Solution: These methods should be properly implemented based on your application’s requirements. For instance:
@Override
public String getJobName() {
return "prometheus-push-job";
}
@Override
public String getEndpoint() {
// Implement logic to return the appropriate endpoint
// For example:
return "http://prometheus-pushgateway:9091";
}Make sure to adjust the implementation to match your specific configuration needs and monitoring setup.
Patch
@@ -2,6 +2,7 @@
import com.example.utils.ServerInfoUtils;
import io.prometheus.client.CollectorRegistry;
+import io.prometheus.client.exporter.PushGatewayConfig;
import lombok.Getter;
import org.springframework.boot.actuate.metrics.export.prometheus.PrometheusPushGatewayManager;
import org.springframework.boot.context.properties.ConfigurationProperties;
@@ -14,7 +15,7 @@ import javax.validation.constraints.NotBlank;
@Configuration
@ConfigurationProperties(prefix = "monitoring.metrics.export.prometheus")
@Validated
-public class MonitoringSetup {
+public class MonitoringSetup implements PushGatewayConfig {
@NotBlank
private String deploymentStage;
@@ -24,15 +25,30 @@ public class MonitoringSetup {
@Bean
PrometheusPushGatewayManager.PushGatewayManagerCustomizer metricsCustomTags() {
return manager -> manager.groupingKey()
- .commonLabels(
- "deployment", deploymentStage,
- "datacenter", datacenter,
- "server", getServerId());
+ .commonLabels(
+ "deployment", deploymentStage,
+ "datacenter", datacenter,
+ "server", getServerId());
+ }
+
+ @Override
+ public boolean isEnabled() {
+ return !"test".equalsIgnoreCase(deploymentStage);
}
private String getServerId() {
String serverId = ServerInfoUtils.getServerId();
return (serverId != null) ? serverId : "unknown-server";
+ }
+
+ @Override
+ public String getJobName() {
+ return null;
+ }
+ @Override
+ public String getEndpoint() {
+ return null;
}
}
Comment 6
Issue: The WAIT_TIME constant is set to 1000 milliseconds, but the comment indicates it should be 1 second.
Fix: Update the WAIT_TIME constant to 1000 milliseconds to match the comment:
private static final long WAIT_TIME = 1000; // Wait time in milliseconds (1 second)
Patch
@@ -0,0 +1,59 @@
+package org.example.network.middleware;
+
+import org.framework.http.NetworkRequest;
+import org.framework.http.client.NetworkRequestExecution;
+import org.framework.http.client.NetworkRequestInterceptor;
+import org.framework.http.client.NetworkResponse;
+import org.framework.stereotype.Service;
+import org.framework.web.client.ConnectionException;
+
+import java.io.IOException;
+
+@Service
+public class ReconnectionMiddleware implements NetworkRequestInterceptor {
+
+ private static final int MAX_TRIES = 3; // Maximum number of connection attempts
+ private static final long WAIT_TIME = 1000; // Wait time in milliseconds (1 second)
+
+ @Override
+ public NetworkResponse intercept(NetworkRequest request, byte[] payload, NetworkRequestExecution execution) throws IOException {
+ int tryCount = 0;
+ while (true) {
+ try {
+ // Attempt to execute the request
+ NetworkResponse response = execution.execute(request, payload);
+
+ // Check if response status code indicates server error
+ if (response.getStatusCode().isServerError()) {
+ tryCount++;
+ if (tryCount >= MAX_TRIES) {
+ // If maximum tries reached, return the last response
+ return response;
+ }
+ waitBeforeRetry(tryCount, response.getStatusCode().toString());
+ } else {
+ return response; // Return response if it's not a server error
+ }
+
+ } catch (IOException | ConnectionException ex) {
+ tryCount++;
+ if (tryCount >= MAX_TRIES) {
+ // If maximum tries reached, rethrow the exception
+ throw ex;
+ }
+ waitBeforeRetry(tryCount, ex.getMessage());
+ }
+ }
+ }
+
+ private void waitBeforeRetry(int tryCount, String reason) throws IOException {
+ // Log the attempt and reason for retry
+ System.out.println("Try " + tryCount + " failed due to: " + reason + ", retrying...");
+ try {
+ Thread.sleep(WAIT_TIME); // Wait before retrying
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ throw new IOException("Thread was interrupted", e);
+ }
+ }
+}
Comment 7
Issue: The reconnection mechanism doesn’t implement a progressive delay, which is generally recommended for retry strategies to prevent overloading the server.
Fix: Implement a progressive delay by updating the waitBeforeRetry method:
private void waitBeforeRetry(int tryCount, String message) throws IOException {
log.error("Try {} failed due to: {}, reconnecting...", tryCount, message);
try {
long waitTime = DELAY * (long) Math.pow(2, tryCount - 1);
Thread.sleep(waitTime);
} catch (InterruptedException e) {
Thread.currentThread().interrupt();
throw new IOException("Thread was interrupted", e);
}
}Patch
@@ -1,61 +1,61 @@
+package com.example.network.interceptor;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpRequest;
+import org.springframework.http.client.ClientHttpRequestExecution;
+import org.springframework.http.client.ClientHttpRequestInterceptor;
+import org.springframework.http.client.ClientHttpResponse;
+import org.springframework.stereotype.Component;
+import org.springframework.web.client.ResourceAccessException;
+
+import java.io.IOException;
+
+@Component
+@Slf4j
+public class ReconnectHandler implements ClientHttpRequestInterceptor {
+
+ private static final int MAX_TRIES = 3; // Maximum number of reconnection attempts
+ private static final long DELAY = 1000; // Initial delay in milliseconds (1 second)
+
+ @Override
+ public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
+ int tryCount = 0;
+ while (true) {
+ try {
+ // Attempt to execute the request
+ ClientHttpResponse result = execution.execute(request, body);
+
+ // Check if result status code is 5xx
+ if (result.getStatusCode().is5xxServerError()) {
+ tryCount++;
+ if (tryCount >= MAX_TRIES) {
+ // If maximum attempts reached, return the last result
+ return result;
+ }
+ waitBeforeRetry(tryCount, result.getStatusCode().toString());
+ } else {
+ return result; // Return result if it's not a server error
+ }
+
+ } catch (IOException | ResourceAccessException ex) {
+ tryCount++;
+ if (tryCount >= MAX_TRIES) {
+ // If maximum attempts reached, rethrow the exception
+ throw ex;
+ }
+ waitBeforeRetry(tryCount, ex.getMessage());
+ }
+ }
+ }
+
+ private void waitBeforeRetry(int tryCount, String message) throws IOException {
+ // Log the attempt and reason for reconnection
+ log.error("Try {} failed due to: {}, reconnecting...", tryCount, message);
+ try {
+ Thread.sleep(DELAY); // Wait before retrying
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ throw new IOException("Thread was interrupted", e);
+ }
+ }
+}
Comment 8
Issue: Potential endless loop in the intercept method Fix: Include a condition to exit the loop when the maximum number of attempts is reached. Update the for loop in the intercept method:
for (int tryCount = 1; tryCount <= RETRY_LIMIT; tryCount++) {
// ... existing code ...
}
return execution.execute(request, body); // Perform one final attempt if all retries failPatch
@@ -0,0 +1,51 @@
+package org.example.network.interceptor;
+
+import lombok.extern.slf4j.Slf4j;
+import org.springframework.http.HttpRequest;
+import org.springframework.http.client.ClientHttpRequestExecution;
+import org.springframework.http.client.ClientHttpRequestInterceptor;
+import org.springframework.http.client.ClientHttpResponse;
+import org.springframework.stereotype.Component;
+import org.springframework.web.client.ResourceAccessException;
+
+import java.io.IOException;
+
+@Component
+@Slf4j
+public class ReconnectInterceptor implements ClientHttpRequestInterceptor {
+
+ private static final int RETRY_LIMIT = 3; // Maximum number of retry attempts
+ private static final long DELAY = 1000; // Delay time in milliseconds (1 second)
+
+ @Override
+ public ClientHttpResponse intercept(HttpRequest request, byte[] body, ClientHttpRequestExecution execution) throws IOException {
+ for (int tryCount = 1;; tryCount++) {
+ try {
+ ClientHttpResponse result = execution.execute(request, body);
+
+ if (!result.getStatusCode().is5xxServerError() || tryCount == RETRY_LIMIT) {
+ return result;
+ }
+
+ waitBeforeRetry(tryCount, result.getStatusCode().toString());
+
+ } catch (IOException | ResourceAccessException ex) {
+ if (tryCount == RETRY_LIMIT) {
+ throw ex;
+ }
+ waitBeforeRetry(tryCount, ex.getMessage());
+ }
+ }
+ }
+
+ private void waitBeforeRetry(int tryCount, String reason) throws IOException {
+ log.error("Try {} failed because of: {}, attempting again...", tryCount, reason);
+ try {
+ Thread.sleep(DELAY); // Pause before retrying
+ } catch (InterruptedException e) {
+ Thread.currentThread().interrupt();
+ throw new IOException("Thread was interrupted during retry delay", e);
+ }
+ }
+}
Comment 9
Issue: Unnecessary UserInfo object creation in extractEmailFromToken method
In the extractEmailFromToken method, a UserInfo object is created but only its email field is used. This is inefficient and can be simplified to improve code clarity and performance.
Resolution:
Remove the UserInfo object creation and directly return the email extracted from the token payload. This simplification will make the code more focused on its primary task of extracting the email.
Patch
@@ -97,39 +97,23 @@ public class AuthServiceImpl implements AuthService {
private String extractEmailFromToken(String authToken) {
try {
- String[] tokenParts = authToken.split("\\.");
- byte[] payloadBytes = Base64.getDecoder().decode(tokenParts[1]);
- String payload = new String(payloadBytes, StandardCharsets.UTF_8);
-
- JsonNode jsonPayload = objectMapper.readTree(payload);
- UserInfo userInfo = new UserInfo();
+ String[] parts = authToken.split("\\.");
+ byte[] decodedPayload = Base64.getDecoder().decode(parts[1]);
+ String payloadJson = new String(decodedPayload, StandardCharsets.UTF_8);
+
+ JsonNode payloadNode = objectMapper.readTree(payloadJson);
try {
- userInfo.setFirstName(jsonPayload.get("given_name").asText());
- } catch (Exception e) {
- logger.warn("Failed to extract 'given_name' from token payload. Using default. Reason: {}", e.getMessage());
- userInfo.setFirstName("DefaultFirstName");
- }
- try {
- userInfo.setLastName(jsonPayload.get("family_name").asText());
- } catch (Exception e) {
- logger.warn("Failed to extract 'family_name' from token payload. Using default. Reason: {}", e.getMessage());
- userInfo.setLastName("DefaultLastName");
- }
- try {
- userInfo.setEmail(jsonPayload.get("email").asText());
+ return payloadNode.get("email").asText();
} catch (Exception e) {
logger.warn("Failed to extract 'email' from token payload. Using default. Reason: {}", e.getMessage());
- userInfo.setEmail("default@example.com");
}
-
- return userInfo.getEmail();
} catch (Exception e) {
logger.error("Failed to decode token or extract user information. Token: {}. Reason: {}", authToken, e.getMessage());
- return null;
}
+
+ throw new AuthenticationException("Failed to extract email from token: " + authToken);
}
private String generateAuthToken() {
// Implementation details...
}
}
Comment 10
Issue: The @RequiredArgsConstructor annotation on both CustomerInfo and PersonName classes is not functioning as intended because there are no final fields in either class. This will cause Lombok to generate a default no-argument constructor instead of a constructor with required parameters.
Fix: Either remove the @RequiredArgsConstructor annotation from both classes, or declare the fields as final if they should be immutable. If a no-argument constructor is necessary, replace @RequiredArgsConstructor with @NoArgsConstructor.
Patch
@@ -0,0 +1,20 @@
+package org.example.customer.api.model;
+
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.RequiredArgsConstructor;
+
+@Getter
+@RequiredArgsConstructor
+public class CustomerInfo {
+ private String contactEmail;
+ private PersonName personName;
+
+ @Getter
+ @RequiredArgsConstructor
+ public static class PersonName {
+ private String givenName;
+ private String familyName;
+
+ }
+}
