Merge pull request #21 from EXIficient/after-jdk8

Make it work for JDKs that no longer contain JAXB

README.md

@@ -15,7 +15,7 @@ Currently we support the following mechanisms
 
 1. Grammars serialized to JavaSourceCode (`class com.siemens.ct.exi.grammars.persistency.Grammars2JavaSourceCode` *explorative*)
 
-2. Grammars serialized in XML (`class com.siemens.ct.exi.grammars.persistency.Grammars2X` *explorative*)
+2. ~~Grammars serialized in XML (`class com.siemens.ct.exi.grammars.persistency.Grammars2X` *explorative*)~~ not supported anymore after v1.0.4 since JAXB dependencies are no longer available in recent JDKs
 
 3. Grammars serialized in JSON (`class com.siemens.ct.exi.grammars.persistency.Grammars2JSON` *explorative*). See its use in https://github.com/EXIficient/exificient-for-json.
 

pom.xml

@@ -79,8 +79,8 @@
 
 	<properties>
 		<!-- maven-compiler-plugin configuration -->
-		<maven.compiler.source>1.5</maven.compiler.source>
-		<maven.compiler.target>1.5</maven.compiler.target>
+		<maven.compiler.source>1.8</maven.compiler.source>
+		<maven.compiler.target>1.8</maven.compiler.target>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 	</properties>
 
@@ -92,10 +92,6 @@
 				<plugin>
 					<groupId>org.apache.maven.plugins</groupId>
 					<artifactId>maven-compiler-plugin</artifactId>
-					<configuration>
-						<source>1.5</source>
-						<target>1.5</target>
-					</configuration>
 				</plugin>
 			</plugins>
 		</pluginManagement>
@@ -156,29 +152,6 @@
 					<tagNameFormat>v@{project.version}</tagNameFormat>
 				</configuration>
 			</plugin>
-			<plugin>
-				<groupId>org.codehaus.mojo</groupId>
-				<artifactId>jaxb2-maven-plugin</artifactId>
-				<version>2.4</version>
-				<executions>
-					<execution>
-						<id>exiGrammars</id>
-						<goals>
-							<goal>xjc</goal>
-						</goals>
-						<configuration>
-							<sources>
-								<source>src/main/resources/SchemaForGrammars.xsd</source>
-							</sources>
-							<packageName>com.siemens.ct.exi.grammars._2017.schemaforgrammars</packageName>
-						</configuration>
-					</execution>
-				</executions>
-				<configuration>
-					<addGeneratedAnnotation>false</addGeneratedAnnotation>
-					<locale>en</locale>
-				</configuration>
-			</plugin>
 			<plugin>
 				<artifactId>maven-assembly-plugin</artifactId>
 				<configuration>