Revert "use add-opens to allow serialization of java.time.Duration"

This reverts commit d1feef2.

Author: diegomarquezp

google-cloud-logging/src/main/java/com/google/cloud/logging/LogEntry.java

@@ -34,6 +34,7 @@
 import com.google.logging.v2.LogEntrySourceLocation;
 import com.google.logging.v2.LogName;
 import java.io.Serializable;
+import java.time.Duration;
 import java.time.Instant;
 import java.util.HashMap;
 import java.util.Map;
@@ -612,6 +613,14 @@ public JsonElement serialize(
     }
   }
 
+  static final class DurationSerializer implements JsonSerializer<Duration> {
+    @Override
+    public JsonElement serialize(
+        Duration src, java.lang.reflect.Type typeOfSrc, JsonSerializationContext context) {
+      return new JsonPrimitive(src.toString());
+    }
+  }
+
   static final class SourceLocationSerializer implements JsonSerializer<SourceLocation> {
     @Override
     public JsonElement serialize(
@@ -649,6 +658,7 @@ public StructuredLogFormatter(StringBuilder builder) {
       checkNotNull(builder);
       this.gson =
           new GsonBuilder()
+              .registerTypeAdapter(Duration.class, new DurationSerializer())
               .registerTypeAdapter(Instant.class, new InstantSerializer())
               .registerTypeAdapter(SourceLocation.class, new SourceLocationSerializer())
               .registerTypeAdapter(HttpRequest.RequestMethod.class, new RequestMethodSerializer())

pom.xml

@@ -197,38 +197,6 @@
             <ignoredUnusedDeclaredDependencies>org.objenesis:objenesis</ignoredUnusedDeclaredDependencies>
           </configuration>
         </plugin>
-        <plugin>
-          <groupId>org.apache.maven.plugins</groupId>
-          <artifactId>maven-jar-plugin</artifactId>
-          <executions>
-            <execution>
-              <id>default-jar</id>
-              <phase>package</phase>
-              <goals>
-                <goal>jar</goal>
-              </goals>
-              <configuration>
-                <archive>
-                  <manifestEntries>
-                    <!-- This manifest entry is ignored by java 8.
-                    It allows inter-module access when Gson serializes
-                    the private variables of java.time.Duration -->
-                    <Add-Opens>java.base/java.time=ALL-UNNAMED</Add-Opens>
-                  </manifestEntries>
-                </archive>
-              </configuration>
-            </execution>
-          </executions>
-        </plugin>
-        <plugin>
-          <groupId>org.apache.maven.plugins</groupId>
-          <artifactId>maven-surefire-plugin</artifactId>
-          <configuration>
-            <!-- This arg line allows inter-module access when Gson serializes
-            the private variables of java.time.Duration -->
-            <argLine>--add-opens java.base/java.time=ALL-UNNAMED</argLine>
-          </configuration>
-        </plugin>
       </plugins>
     </pluginManagement>
   </build>