fixes via intellij

posthog/src/main/java/com/posthog/java/DefaultPostHogLogger.java

@@ -0,0 +1,37 @@
+package com.posthog.java;
+
+import java.util.logging.Level;
+import java.util.logging.Logger;
+
+public class DefaultPostHogLogger implements PostHogLogger {
+    private final Logger logger;
+
+    public DefaultPostHogLogger() {
+        this.logger = Logger.getLogger(PostHog.class.getName());
+    }
+
+    @Override
+    public void debug(String message) {
+        logger.fine(message);
+    }
+
+    @Override
+    public void info(String message) {
+        logger.info(message);
+    }
+
+    @Override
+    public void warn(String message) {
+        logger.warning(message);
+    }
+
+    @Override
+    public void error(String message) {
+        logger.severe(message);
+    }
+
+    @Override
+    public void error(String message, Throwable throwable) {
+        logger.log(Level.SEVERE, message, throwable);
+    }
+}

posthog/src/main/java/com/posthog/java/HttpSender.java

@@ -15,12 +15,12 @@
 import okhttp3.Response;
 
 public class HttpSender implements Sender {
-    private String apiKey;
-    private String host;
-    private OkHttpClient client;
-    private int maxRetries;
-    private Duration initialRetryInterval;
-    private PostHogLogger logger;
+    private final String apiKey;
+    private final String host;
+    private final OkHttpClient client;
+    private final int maxRetries;
+    private final Duration initialRetryInterval;
+    private final PostHogLogger logger;
 
     public static class Builder {
         // required
@@ -34,6 +34,7 @@ public static class Builder {
 
         // optional
         private Duration initialRetryInterval = Duration.ofMillis(500);
+        private PostHogLogger logger = new DefaultPostHogLogger();
 
         public Builder(String apiKey) {
             this.apiKey = apiKey;
@@ -61,9 +62,6 @@ public Builder logger(PostHogLogger logger) {
         }
 
         public HttpSender build() {
-            if (this.logger == null) {
-                this.logger = new DefaultPostHogLogger();
-            }
             return new HttpSender(this);
         }
     }
@@ -181,17 +179,15 @@ public JSONObject post(String route, String distinctId) {
             response = call.execute();
 
             if (response.isSuccessful()) {
-                JSONObject responseJSON = new JSONObject(response.body().string());
-
-                return responseJSON;
+                return new JSONObject(response.body().string());
             }
 
             if (response.code() >= 400 && response.code() < 500) {
                 logger.error("Error calling API: " + response.body().string());
                 return null;
             }
         } catch (IOException e) {
-            e.printStackTrace();
+            logger.error("Error calling API", e);
         } finally {
             if (response != null) {
                 response.close();

posthog/src/main/java/com/posthog/java/PostHog.java

@@ -9,10 +9,10 @@
 import org.json.JSONObject;
 
 public class PostHog {
-    private QueueManager queueManager;
+    private final QueueManager queueManager;
     private Thread queueManagerThread;
-    private Sender sender;
-    private PostHogLogger logger; 
+    private final Sender sender;
+    private final PostHogLogger logger;
 
     private static abstract class BuilderBase {
         protected QueueManager queueManager;

posthog/src/main/java/com/posthog/java/PostHogLogger.java

@@ -0,0 +1,13 @@
+package com.posthog.java;
+
+/**
+ * Allows you to inject a logger to the PostHog library
+ * We configure the DefaultPostHogLogger if one is not provided
+ */
+public interface PostHogLogger {
+    void debug(String message);
+    void info(String message);
+    void warn(String message);
+    void error(String message);
+    void error(String message, Throwable throwable);
+}