DefaultConfigProperties#getMap filters entries with blank values intead of throwing

sdk-extensions/autoconfigure-spi/src/main/java/io/opentelemetry/sdk/autoconfigure/spi/ConfigProperties.java

@@ -184,7 +184,7 @@ default List<String> getList(String name, List<String> defaultValue) {
   /**
    * Returns a Map configuration property. The format of the original value must be comma-separated
    * for each key, with an '=' separating the key and value. For instance, <code>
-   * service.name=Greatest Service,host.name=localhost</code> Empty values will be removed.
+   * service.name=Greatest Service,host.name=localhost</code>. Empty values will be removed.
    *
    * @return an empty map if the property has not been configured.
    * @throws ConfigurationException for malformed map strings.

sdk-extensions/autoconfigure-spi/src/main/java/io/opentelemetry/sdk/autoconfigure/spi/internal/DefaultConfigProperties.java

@@ -9,6 +9,7 @@
 import static java.util.stream.Collectors.joining;
 
 import io.opentelemetry.api.internal.ConfigUtil;
+import io.opentelemetry.api.internal.StringUtils;
 import io.opentelemetry.sdk.autoconfigure.spi.ConfigProperties;
 import io.opentelemetry.sdk.autoconfigure.spi.ConfigurationException;
 import java.time.Duration;
@@ -209,16 +210,21 @@ public static Set<String> getSet(ConfigProperties config, String name) {
   @Override
   public Map<String, String> getMap(String name) {
     return getList(ConfigUtil.normalizePropertyKey(name)).stream()
-        .map(keyValuePair -> filterBlanksAndNulls(keyValuePair.split("=", 2)))
         .map(
-            splitKeyValuePairs -> {
-              if (splitKeyValuePairs.size() != 2) {
+            entry -> {
+              String[] split = entry.split("=", 2);
+              if (split.length != 2 || StringUtils.isNullOrEmpty(split[0])) {
                 throw new ConfigurationException(
                     "Invalid map property: " + name + "=" + config.get(name));
               }
-              return new AbstractMap.SimpleImmutableEntry<>(
-                  splitKeyValuePairs.get(0), splitKeyValuePairs.get(1));
+              return filterBlanksAndNulls(split);
             })
+        // Filter entries with an empty value, i.e. "foo="
+        .filter(splitKeyValuePairs -> splitKeyValuePairs.size() == 2)
+        .map(
+            splitKeyValuePairs ->
+                new AbstractMap.SimpleImmutableEntry<>(
+                    splitKeyValuePairs.get(0), splitKeyValuePairs.get(1)))
         // If duplicate keys, prioritize later ones similar to duplicate system properties on a
         // Java command line.
         .collect(

sdk-extensions/autoconfigure-spi/src/test/java/io/opentelemetry/sdk/autoconfigure/spi/internal/ConfigPropertiesTest.java

@@ -155,12 +155,6 @@ void uncleanMap() {
 
   @Test
   void invalidMap() {
-    assertThatThrownBy(
-            () ->
-                DefaultConfigProperties.createFromMap(Collections.singletonMap("map", "a=1,b="))
-                    .getMap("map"))
-        .isInstanceOf(ConfigurationException.class)
-        .hasMessage("Invalid map property: map=a=1,b=");
     assertThatThrownBy(
             () ->
                 DefaultConfigProperties.createFromMap(Collections.singletonMap("map", "a=1,b"))
@@ -281,7 +275,7 @@ private static Map<String, String> makeTestProps() {
     properties.put("test.double", "5.4");
     properties.put("test.boolean", "true");
     properties.put("test.list", "cat,dog,bear");
-    properties.put("test.map", "cat=meow,dog=bark,bear=growl");
+    properties.put("test.map", "cat=meow,dog=bark,bear=growl,bird=");
     properties.put("test.duration", "1s");
     return properties;
   }

sdk-extensions/autoconfigure/src/test/java/io/opentelemetry/sdk/autoconfigure/ResourceConfigurationTest.java

@@ -30,7 +30,8 @@ class ResourceConfigurationTest {
   void customConfigResource() {
     Map<String, String> props = new HashMap<>();
     props.put("otel.service.name", "test-service");
-    props.put("otel.resource.attributes", "food=cheesecake,drink=juice");
+    props.put(
+        "otel.resource.attributes", "food=cheesecake,drink=juice,animal=  ,color=,shape=square");
     props.put("otel.experimental.resource.disabled-keys", "drink");
 
     assertThat(
@@ -42,6 +43,7 @@ void customConfigResource() {
             Resource.getDefault().toBuilder()
                 .put(ResourceAttributes.SERVICE_NAME, "test-service")
                 .put("food", "cheesecake")
+                .put("shape", "square")
                 .setSchemaUrl(ResourceAttributes.SCHEMA_URL)
                 .build());
   }