Avoid false type warnings in DeclarativeConfigPropertyUtil.toMap

api/incubator/src/main/java/io/opentelemetry/api/incubator/config/DeclarativeConfigPropertyUtil.java

@@ -62,25 +62,33 @@ private static Object resolveValue(
   @Nullable
   private static Object getString(
       String key, DeclarativeConfigProperties declarativeConfigProperties) {
-    return declarativeConfigProperties.getString(key);
+    return declarativeConfigProperties.isString(key)
+        ? declarativeConfigProperties.getString(key)
+        : null;
   }
 
   @Nullable
   private static Object getBoolean(
       String key, DeclarativeConfigProperties declarativeConfigProperties) {
-    return declarativeConfigProperties.getBoolean(key);
+    return declarativeConfigProperties.isBoolean(key)
+        ? declarativeConfigProperties.getBoolean(key)
+        : null;
   }
 
   @Nullable
   private static Object getLong(
       String key, DeclarativeConfigProperties declarativeConfigProperties) {
-    return declarativeConfigProperties.getLong(key);
+    return declarativeConfigProperties.isLong(key)
+        ? declarativeConfigProperties.getLong(key)
+        : null;
   }
 
   @Nullable
   private static Object getDouble(
       String key, DeclarativeConfigProperties declarativeConfigProperties) {
-    return declarativeConfigProperties.getDouble(key);
+    return declarativeConfigProperties.isDouble(key)
+        ? declarativeConfigProperties.getDouble(key)
+        : null;
   }
 
   @Nullable

api/incubator/src/test/java/io/opentelemetry/api/incubator/config/DeclarativeConfigPropertyUtilTest.java

@@ -0,0 +1,57 @@
+/*
+ * Copyright The OpenTelemetry Authors
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+package io.opentelemetry.api.incubator.config;
+
+import static org.assertj.core.api.Assertions.assertThat;
+
+import com.google.common.collect.ImmutableMap;
+import io.github.netmikey.logunit.api.LogCapturer;
+import io.opentelemetry.common.ComponentLoader;
+import io.opentelemetry.sdk.autoconfigure.declarativeconfig.YamlDeclarativeConfigProperties;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+import org.junit.jupiter.api.Test;
+import org.junit.jupiter.api.extension.RegisterExtension;
+
+class DeclarativeConfigPropertyUtilTest {
+
+  @RegisterExtension
+  LogCapturer logCapturer =
+      LogCapturer.create().captureForType(YamlDeclarativeConfigProperties.class);
+
+  @Test
+  void toMap_doesNotLogTypeWarnings() {
+    Map<String, Object> properties = new HashMap<>();
+    properties.put("string_key", "value");
+    properties.put("bool_key", true);
+    properties.put("int_key", 1);
+    properties.put("double_key", 0.25);
+    properties.put("map_key", Collections.singletonMap("ratio", 0.25));
+    properties.put("string_list_key", Arrays.asList("a", "b"));
+    properties.put(
+        "structured_list_key", Collections.singletonList(Collections.singletonMap("k", false)));
+    DeclarativeConfigProperties config =
+        YamlDeclarativeConfigProperties.create(
+            properties, ComponentLoader.forClassLoader(getClass().getClassLoader()));
+
+    Map<String, Object> result = DeclarativeConfigProperties.toMap(config);
+
+    assertThat(result)
+        .containsExactlyInAnyOrderEntriesOf(
+            ImmutableMap.<String, Object>builder()
+                .put("string_key", "value")
+                .put("bool_key", true)
+                .put("int_key", 1L)
+                .put("double_key", 0.25)
+                .put("map_key", ImmutableMap.of("ratio", 0.25))
+                .put("string_list_key", Arrays.asList("a", "b"))
+                .put("structured_list_key", Collections.singletonList(ImmutableMap.of("k", false)))
+                .build());
+    assertThat(logCapturer.getEvents()).isEmpty();
+  }
+}