Add Java 11 test configs

.kokoro/continuous/java11.cfg

@@ -0,0 +1,7 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+  key: "TRAMPOLINE_IMAGE"
+  value: "gcr.io/cloud-devrel-kokoro-resources/java11"
+}

.kokoro/presubmit/java11.cfg

@@ -0,0 +1,7 @@
+# Format: //devtools/kokoro/config/proto/build.proto
+
+# Configure the docker image for kokoro-trampoline.
+env_vars: {
+  key: "TRAMPOLINE_IMAGE"
+  value: "gcr.io/cloud-devrel-kokoro-resources/java11"
+}

README.md

@@ -222,7 +222,7 @@ Java Version | Status
 ------------ | ------
 Java 7 | [![Kokoro CI](https://storage.googleapis.com/cloud-devrel-public/java/badges/google-api-java-client/java7.svg)](https://storage.googleapis.com/cloud-devrel-public/java/badges/google-api-java-client/java7.html)
 Java 8 | [![Kokoro CI](https://storage.googleapis.com/cloud-devrel-public/java/badges/google-api-java-client/java8.svg)](https://storage.googleapis.com/cloud-devrel-public/java/badges/google-api-java-client/java8.html)
-Java 10 | [![Kokoro CI](https://storage.googleapis.com/cloud-devrel-public/java/badges/google-api-java-client/java10.svg)](https://storage.googleapis.com/cloud-devrel-public/java/badges/google-api-java-client/java10.html)
+Java 11 | [![Kokoro CI](https://storage.googleapis.com/cloud-devrel-public/java/badges/google-api-java-client/java11.svg)](https://storage.googleapis.com/cloud-devrel-public/java/badges/google-api-java-client/java11.html)
 
 ## Dependencies
 This library is built on top of two common libraries, also built by Google, and also designed to

google-api-client/src/main/java/com/google/api/client/googleapis/services/AbstractGoogleClientRequest.java

@@ -173,12 +173,24 @@ private static ApiClientVersion getDefault() {
 
     private static String getJavaVersion() {
       String version = System.getProperty("java.version");
-      // Java 9 doesn't report a semver here: instead it's something like 9-Debian+0-x-y
-      if (version.startsWith("9")) {
-        return "9.0.0";
-      } else {
-        return formatSemver(version);
+      if (version == null) {
+        return null;
       }
+
+      // Try parsing the full semver
+      String formatted = formatSemver(version, null);
+      if (formatted != null) {
+        return formatted;
+      }
+
+      // Some java versions start with the version number and may contain extra info
+      // e.g. Java 9 reports something like 9-Debian+0-x-y while Java 11 reports "11"
+      Matcher m = Pattern.compile("^(\\d+)[^\\d]?").matcher(version);
+      if (m.find()) {
+        return m.group(1) + ".0.0";
+      }
+
+      return null;
     }
 
     private static String formatName(String name) {
@@ -187,6 +199,10 @@ private static String formatName(String name) {
     }
 
     private static String formatSemver(String version) {
+      return formatSemver(version, version);
+    }
+
+    private static String formatSemver(String version, String defaultValue) {
       if (version == null) {
         return null;
       }
@@ -196,7 +212,7 @@ private static String formatSemver(String version) {
       if (m.find()) {
         return m.group(1);
       } else {
-        return version;
+        return defaultValue;
       }
     }
   }

pom.xml

@@ -326,7 +326,7 @@
         <plugin>
           <groupId>org.apache.maven.plugins</groupId>
           <artifactId>maven-javadoc-plugin</artifactId>
-          <version>2.9.1</version>
+          <version>3.0.1</version>
           <executions>
             <execution>
               <id>attach-javadocs</id>
@@ -386,7 +386,7 @@
       <plugin>
         <artifactId>maven-javadoc-plugin</artifactId>
         <configuration>
-          <additionalparam>-Xdoclint:none</additionalparam>
+          <doclint>none</doclint>
         </configuration>
         <executions>
           <execution>