Upgrade to Java 11 (#743)

Author: lintool

.travis.yml

@@ -9,7 +9,7 @@ before_install:
 install: true
 dist: trusty
 jdk:
-  - oraclejdk8
+  - oraclejdk11
 script:
   - mvn clean package appassembler:assemble
   - find target/appassembler/bin/ -type f -exec sed -i 's/-Xmx.*G/-Xmx2G/g' {} \;

pom.xml

@@ -76,12 +76,12 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.7.0</version>
+        <version>3.8.1</version>
         <configuration>
-          <source>1.8</source>
-          <target>1.8</target>
-          <testSource>1.8</testSource>
-          <testTarget>1.8</testTarget>
+          <source>11</source>
+          <target>11</target>
+          <testSource>11</testSource>
+          <testTarget>11</testTarget>
           <showDeprecation>true</showDeprecation>
           <compilerArgument>-Xlint:unchecked</compilerArgument>
         </configuration>
@@ -123,7 +123,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-javadoc-plugin</artifactId>
-        <version>3.0.1</version>
+        <version>3.1.0</version>
         <executions>
           <execution>
             <id>attach-javadocs</id>
@@ -139,7 +139,7 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-shade-plugin</artifactId>
-        <version>3.1.0</version>
+        <version>3.2.1</version>
         <executions>
           <execution>
             <!-- default is to bind to package phase: we override and not create fatjar unless explicitly
@@ -179,12 +179,12 @@
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-source-plugin</artifactId>
-        <version>3.0.1</version>
+        <version>3.1.0</version>
       </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>
         <artifactId>maven-deploy-plugin</artifactId>
-        <version>2.8.2</version>
+        <version>3.0.0-M1</version>
       </plugin>
       <plugin>
         <groupId>org.apache.maven.plugins</groupId>