Requiring Java version 1.5 to be used for our APIs. (#1088)

Requiring Java version 1.5 to be used for our APIs. Demo is exempt from
this requirement. animal-sniffer plugin used for this.

java/carrier/pom.xml

@@ -28,6 +28,28 @@
         <targetPath>com/google/i18n/phonenumbers/carrier/testing_data</targetPath>
       </testResource>
     </testResources>
+    <plugins>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>animal-sniffer-maven-plugin</artifactId>
+        <version>1.15</version>
+        <executions>
+          <execution>
+            <phase>test</phase>
+            <goals>
+              <goal>check</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+          <signature>
+            <groupId>org.codehaus.mojo.signature</groupId>
+            <artifactId>java15</artifactId>
+            <version>1.0</version>
+          </signature>
+        </configuration>
+      </plugin>
+    </plugins>
   </build>
 
   <dependencies>

java/geocoder/pom.xml

@@ -36,6 +36,28 @@
         <targetPath>com/google/i18n/phonenumbers/timezones/testing_data</targetPath>
       </testResource>
     </testResources>
+    <plugins>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>animal-sniffer-maven-plugin</artifactId>
+        <version>1.15</version>
+        <executions>
+          <execution>
+            <phase>test</phase>
+            <goals>
+              <goal>check</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+          <signature>
+            <groupId>org.codehaus.mojo.signature</groupId>
+            <artifactId>java15</artifactId>
+            <version>1.0</version>
+          </signature>
+        </configuration>
+      </plugin>
+    </plugins>
   </build>
 
   <dependencies>

java/internal/prefixmapper/pom.xml

@@ -23,6 +23,28 @@
         <targetPath>com/google/i18n/phonenumbers/geocoding/testing_data</targetPath>
       </testResource>
     </testResources>
+    <plugins>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>animal-sniffer-maven-plugin</artifactId>
+        <version>1.15</version>
+        <executions>
+          <execution>
+            <phase>test</phase>
+            <goals>
+              <goal>check</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+          <signature>
+            <groupId>org.codehaus.mojo.signature</groupId>
+            <artifactId>java15</artifactId>
+            <version>1.0</version>
+          </signature>
+        </configuration>
+      </plugin>
+    </plugins>
   </build>
 
   <dependencies>

java/libphonenumber/pom.xml

@@ -60,6 +60,26 @@
           </execution>
         </executions>
       </plugin>
+      <plugin>
+        <groupId>org.codehaus.mojo</groupId>
+        <artifactId>animal-sniffer-maven-plugin</artifactId>
+        <version>1.15</version>
+        <executions>
+          <execution>
+            <phase>test</phase>
+            <goals>
+              <goal>check</goal>
+            </goals>
+          </execution>
+        </executions>
+        <configuration>
+          <signature>
+            <groupId>org.codehaus.mojo.signature</groupId>
+            <artifactId>java15</artifactId>
+            <version>1.0</version>
+          </signature>
+        </configuration>
+      </plugin>
     </plugins>
   </build>