fix: Parse string environment variables into numbers

src/main/java/io/supertokens/utils/ConfigMapper.java

@@ -98,17 +98,29 @@ public class ConfigMapper {
             if (targetType == String.class) {
                 return value.getAsString();
             } else if (targetType == Integer.class || targetType == int.class) {
-                if (value.getAsDouble() == (double) value.getAsInt()) {
+                if (value.isJsonPrimitive() && value.getAsJsonPrimitive().isString()) {
+                    return Integer.parseInt(value.getAsString());
+                } else if (value.getAsDouble() == (double) value.getAsInt()) {
                     return value.getAsInt();
                 }
             } else if (targetType == Long.class || targetType == long.class) {
-                if (value.getAsDouble() == (double) value.getAsLong()) {
+                if (value.isJsonPrimitive() && value.getAsJsonPrimitive().isString()) {
+                    return Long.parseLong(value.getAsString());
+                } else if (value.getAsDouble() == (double) value.getAsLong()) {
                     return value.getAsLong();
                 }
             } else if (targetType == Double.class || targetType == double.class) {
-                return value.getAsDouble();
+                if (value.isJsonPrimitive() && value.getAsJsonPrimitive().isString()) {
+                    return Double.parseDouble(value.getAsString());
+                } else {
+                    return value.getAsDouble();
+                }
             } else if (targetType == Float.class || targetType == float.class) {
-                return value.getAsFloat();
+                if (value.isJsonPrimitive() && value.getAsJsonPrimitive().isString()) {
+                    return Float.parseFloat(value.getAsString());
+                } else {
+                    return value.getAsFloat();
+                }
             } else if (targetType == Boolean.class || targetType == boolean.class) {
                 // Handle boolean conversion from strings like "true", "false"
                 return handleBooleanConversion(value, fieldName);

src/test/java/io/supertokens/test/ConfigMapperTest.java

@@ -292,4 +292,37 @@ public class ConfigMapperTest {
             }
         }
     }
+
+    @Test
+    public void testNumericStringParsing() throws Exception {
+        // Test parsing of numeric strings from environment variables
+        
+        // integer from string
+        {
+            JsonObject config = new JsonObject();
+            config.addProperty("int_property", "12345");
+            assertEquals(12345, ConfigMapper.mapConfig(config, DummyConfig.class).int_property);
+        }
+        
+        // long from string
+        {
+            JsonObject config = new JsonObject();
+            config.addProperty("long_property", "9876543210");
+            assertEquals(9876543210L, ConfigMapper.mapConfig(config, DummyConfig.class).long_property);
+        }
+        
+        // double from string
+        {
+            JsonObject config = new JsonObject();
+            config.addProperty("double_property", "123.456");
+            assertEquals(123.456, ConfigMapper.mapConfig(config, DummyConfig.class).double_property, 0.001);
+        }
+        
+        // float from string
+        {
+            JsonObject config = new JsonObject();
+            config.addProperty("float_property", "98.76");
+            assertEquals(98.76f, ConfigMapper.mapConfig(config, DummyConfig.class).float_property, 0.001);
+        }
+    }
 }