generates runtime javadoc jar now with dot generation for PredictionContext

runtime/Java/pom.xml

@@ -16,6 +16,11 @@
 	<name>ANTLR 4 Runtime</name>
 	<description>The ANTLR 4 Runtime</description>
 
+	<properties>
+		<!-- Assumes dot is in the system path, or specified for the build. -->
+		<dot.path>dot</dot.path>
+	</properties>
+
 	<build>
 		<sourceDirectory>src</sourceDirectory>
 		<plugins>
@@ -31,13 +36,39 @@
 					</execution>
 				</executions>
 			</plugin>
+			<plugin>
+				<groupId>us.bryon</groupId>
+				<artifactId>graphviz-maven-plugin</artifactId>
+				<version>1.0</version>
+				<executions>
+					<execution>
+						<goals>
+							<goal>dot</goal>
+						</goals>
+						<configuration>
+							<dot>${dot.path}</dot>
+							<destdir>${project.build.directory}/apidocs</destdir>
+							<output>svg</output>
+						</configuration>
+					</execution>
+				</executions>
+			</plugin>
 			<plugin> <!-- create javadoc jar -->
 				<groupId>org.apache.maven.plugins</groupId>
 				<artifactId>maven-javadoc-plugin</artifactId>
 				<version>2.10.4</version>
 				<configuration>
 					<javadocVersion>1.7</javadocVersion>
+					<failOnError>false</failOnError>
 				</configuration>
+				<executions>
+					<execution>
+						<id>attach-javadocs</id>
+						<goals>
+							<goal>jar</goal>
+						</goals>
+					</execution>
+				</executions>
 			</plugin>
 			<plugin>
 				<groupId>org.antlr</groupId>