Require Java 17+

.github/workflows/test.yml

@@ -9,7 +9,7 @@ jobs:
       matrix:
         distribution: ['zulu']
         os: [ubuntu-latest, windows-latest, macos-latest]
-        version: [ 11, 17, 21, 22 ]
+        version: [ 17, 21, 24 ]
     steps:
       - uses: actions/checkout@v5
         with:

CHANGELOG.md

@@ -1,6 +1,11 @@
 CHANGELOG
 =========
 
+4.0.0
+------------------
+
+* Java 17 or greater is now required.
+
 3.2.0 (2025-05-28)
 ------------------
 

README.md

@@ -120,8 +120,8 @@ public class Lookup {
 }
 ```
 
-You can also use the reader object to iterate over the database. 
-The `reader.networks()` and `reader.networksWithin()` methods can 
+You can also use the reader object to iterate over the database.
+The `reader.networks()` and `reader.networksWithin()` methods can
 be used for this purpose.
 
 ```java
@@ -207,7 +207,7 @@ specific to this reader, please [contact MaxMind support](https://www.maxmind.co
 
 ## Requirements  ##
 
-This API requires Java 11 or greater.
+This API requires Java 17 or greater.
 
 ## Contributing ##
 

pom.xml

@@ -147,9 +147,9 @@
                 <artifactId>maven-compiler-plugin</artifactId>
                 <version>3.14.0</version>
                 <configuration>
-                    <release>11</release>
-                    <source>11</source>
-                    <target>11</target>
+                    <release>17</release>
+                    <source>17</source>
+                    <target>17</target>
                 </configuration>
             </plugin>
             <plugin>

sample/Benchmark.java

@@ -45,7 +45,7 @@ private static void bench(Reader r, int count, int seed) throws IOException {
         for (int i = 0; i < count; i++) {
             random.nextBytes(address);
             InetAddress ip = InetAddress.getByAddress(address);
-            Map t = r.get(ip, Map.class);
+            Map<String, Object> t = r.get(ip, Map.class);
             if (TRACE) {
                 if (i % 50000 == 0) {
                     System.out.println(i + " " + ip);

src/main/java/com/maxmind/db/CHMCache.java

@@ -13,7 +13,7 @@ public class CHMCache implements NodeCache {
     private static final int DEFAULT_CAPACITY = 4096;
 
     private final int capacity;
-    private final ConcurrentHashMap<CacheKey, DecodedValue> cache;
+    private final ConcurrentHashMap<CacheKey<?>, DecodedValue> cache;
     private boolean cacheFull = false;
 
     /**
@@ -36,7 +36,7 @@ public CHMCache(int capacity) {
     }
 
     @Override
-    public DecodedValue get(CacheKey key, Loader loader) throws IOException {
+    public DecodedValue get(CacheKey<?> key, Loader loader) throws IOException {
         DecodedValue value = cache.get(key);
         if (value == null) {
             value = loader.load(key);

src/main/java/com/maxmind/db/CacheKey.java

@@ -6,61 +6,9 @@
  * of the value.
  *
  * @param <T> the type of value
+ * @param offset the offset of the value in the database file
+ * @param cls the class of the value
+ * @param type the type of the value
  */
-public final class CacheKey<T> {
-    private final int offset;
-    private final Class<T> cls;
-    private final java.lang.reflect.Type type;
-
-    CacheKey(int offset, Class<T> cls, java.lang.reflect.Type type) {
-        this.offset = offset;
-        this.cls = cls;
-        this.type = type;
-    }
-
-    int getOffset() {
-        return this.offset;
-    }
-
-    Class<T> getCls() {
-        return this.cls;
-    }
-
-    java.lang.reflect.Type getType() {
-        return this.type;
-    }
-
-    @Override
-    public boolean equals(Object o) {
-        if (o == null) {
-            return false;
-        }
-
-        CacheKey other = (CacheKey) o;
-
-        if (this.offset != other.offset) {
-            return false;
-        }
-
-        if (this.cls == null) {
-            if (other.cls != null) {
-                return false;
-            }
-        } else if (!this.cls.equals(other.cls)) {
-            return false;
-        }
-
-        if (this.type == null) {
-            return other.type == null;
-        }
-        return this.type.equals(other.type);
-    }
-
-    @Override
-    public int hashCode() {
-        int result = offset;
-        result = 31 * result + (cls == null ? 0 : cls.hashCode());
-        result = 31 * result + (type == null ? 0 : type.hashCode());
-        return result;
-    }
+public record CacheKey<T>(int offset, Class<T> cls, java.lang.reflect.Type type) {
 }

src/main/java/com/maxmind/db/CachedConstructor.java

@@ -3,37 +3,10 @@
 import java.lang.reflect.Constructor;
 import java.util.Map;
 
-final class CachedConstructor<T> {
-    private final Constructor<T> constructor;
-    private final Class<?>[] parameterTypes;
-    private final java.lang.reflect.Type[] parameterGenericTypes;
-    private final Map<String, Integer> parameterIndexes;
-
-    CachedConstructor(
-        Constructor<T> constructor,
-        Class<?>[] parameterTypes,
-        java.lang.reflect.Type[] parameterGenericTypes,
-        Map<String, Integer> parameterIndexes
-    ) {
-        this.constructor = constructor;
-        this.parameterTypes = parameterTypes;
-        this.parameterGenericTypes = parameterGenericTypes;
-        this.parameterIndexes = parameterIndexes;
-    }
-
-    Constructor<T> getConstructor() {
-        return this.constructor;
-    }
-
-    Class<?>[] getParameterTypes() {
-        return this.parameterTypes;
-    }
-
-    java.lang.reflect.Type[] getParameterGenericTypes() {
-        return this.parameterGenericTypes;
-    }
-
-    Map<String, Integer> getParameterIndexes() {
-        return this.parameterIndexes;
-    }
+record CachedConstructor<T>(
+    Constructor<T> constructor,
+    Class<?>[] parameterTypes,
+    java.lang.reflect.Type[] parameterGenericTypes,
+    Map<String, Integer> parameterIndexes
+) {
 }

src/main/java/com/maxmind/db/CtrlData.java

@@ -1,31 +1,4 @@
 package com.maxmind.db;
 
-final class CtrlData {
-    private final Type type;
-    private final int ctrlByte;
-    private final int offset;
-    private final int size;
-
-    CtrlData(Type type, int ctrlByte, int offset, int size) {
-        this.type = type;
-        this.ctrlByte = ctrlByte;
-        this.offset = offset;
-        this.size = size;
-    }
-
-    public Type getType() {
-        return this.type;
-    }
-
-    public int getCtrlByte() {
-        return this.ctrlByte;
-    }
-
-    public int getOffset() {
-        return this.offset;
-    }
-
-    public int getSize() {
-        return this.size;
-    }
+record CtrlData(Type type, int ctrlByte, int offset, int size) {
 }