A.ttl

@base          <http://example.org/> .
@prefix rdf:   <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rel:   <http://www.perceive.net/schemas/relationship/> .
@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .
@prefix foaf:  <http://xmlns.com/foaf/0.1/> .

<#spiderman>  a      foaf:Person ;
        rel:enemyOf  <#green-goblin> ;
        foaf:name    "Человек-паук"@ru , "Spiderman" .

<#green-goblin>  a   foaf:Person ;
        rel:enemyOf  <#spiderman> ;
        foaf:name    "Green Goblin" .

B.ttl

@prefix rdf:  <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rel:  <http://www.perceive.net/schemas/relationship/> .
@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .
@prefix foaf:  <http://xmlns.com/foaf/0.1/> .

<#spiderman>  foaf:name  "Человек-паук"@ru ;
        foaf:name    "Spiderman" ;
        rdf:type     foaf:Person ;
        rel:enemyOf  <#green-goblin> .

<#green-goblin>  foaf:name  "Green Goblin" ;
        rdf:type     foaf:Person ;
        rel:enemyOf  <#spiderman> .

C.ttl

@prefix rdf:   <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rel:   <http://www.perceive.net/schemas/relationship/> .
@prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .
@prefix foaf:  <http://xmlns.com/foaf/0.1/> .
@prefix base:  <http://example.org/> .

<http://example.org/#spiderman>
        a            foaf:Person ;
        rel:enemyOf  <http://example.org/#green-goblin> ;
        foaf:name    "Человек-паук"@ru , "Spiderman" .

<http://example.org/#green-goblin>
        a            foaf:Person ;
        rel:enemyOf  <http://example.org/#spiderman> ;
        foaf:name    "Green Goblin" .

ggoblin.ttl

@base <http://example.org/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix rel: <http://www.perceive.net/schemas/relationship/> .

<#green-goblin>
    rel:enemyOf <#spiderman> ;
    a foaf:Person ;    # in the context of the Marvel universe
    foaf:name "Green Goblin" .

<#spiderman>
    rel:enemyOf <#green-goblin> ;
    a foaf:Person ;
    foaf:name "Spiderman", "Человек-паук"@ru .

JenaBug.java

// Jena version related information mentioned in pom.xml

package mwa_jenabug;

import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

import org.apache.jena.rdf.model.Model;
import org.apache.jena.rdf.model.ModelFactory;
import org.apache.jena.riot.RDFDataMgr;
import org.apache.jena.riot.RDFFormat;
import org.apache.jena.riot.RDFWriter;

public class JenaBug {
	
	public static Model read_rdfxml(String filename, String base) {
		Model m = ModelFactory.createDefaultModel();
		InputStream in = null;
		
		try {
			in = (InputStream) new FileInputStream(filename);
			m.read(in, base, "RDF/XML");
			in.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		return m;
	}

	public static Model read_rdfttl(String filename, String base) {
		Model m = ModelFactory.createDefaultModel();
		InputStream in = null;
		
		try {
			in = (InputStream) new FileInputStream(filename);
			m.read(in, base, "TTL");
			in.close();
		} catch (FileNotFoundException e) {
			e.printStackTrace();
		} catch (IOException e) {
			e.printStackTrace();
		}
		
		return m;
	}

	public static int write_as_ttlA(Model m, String filename, String base) {
		OutputStream tout = null;
		try {
			tout = (OutputStream) new FileOutputStream(filename);

			m.write(tout, "TURTLE", base);
			if(tout != null) {
				tout.close();
			}
		} catch (IOException e) {
			e.printStackTrace();
			return 1;
		} 
		return 0;
	}

	public static int write_as_ttlB(Model m, String filename, String base) {
		OutputStream tout = null;
		try {
			tout = (OutputStream) new FileOutputStream(filename);

			RDFWriter.create()
					 .source(m)
					 .format(RDFFormat.TURTLE_BLOCKS)
					 .base(base)
					 .output(tout);
			if(tout != null) {
				tout.close();
			}
		} catch (IOException e) {
			e.printStackTrace();
			return 1;
		} 
		return 0;
	}
	

	public static int write_as_ttlC(Model m, String filename, String base) {
		OutputStream tout = null;
		try {
			tout = (OutputStream) new FileOutputStream(filename);
			// no option to specify base !
			// moreover adding "base" in the prefix namespace doesn't help
			m.setNsPrefix("base", base);
			RDFDataMgr.write((OutputStream) tout, m, RDFFormat.TTL);
			if(tout != null) {
				tout.close();
			}
		} catch (IOException e) {
			e.printStackTrace();
			return 1;
		} 
		return 0;
	}
	
	/**
	 * TTL
	 * TURTLE
	 * TURTLE_PRETTY work fine
	 * 
	 * 
	 * TURTLE_FLAT
	 * TURTLE_BLOCKS don't output base
	 */
	public static void main(String[] args) {
		String base = "http://example.org/";
		Model m = read_rdfttl("./ggoblin.ttl", base);
		write_as_ttlA(m, "./example07_A.ttl", base);
		write_as_ttlB(m, "./example07_B.ttl", base);
		write_as_ttlC(m, "./example07_C.ttl", base);
	}
}

pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>
  <groupId>mwa_jenabug</groupId>
  <artifactId>mwa_jenabug</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <build>
    <sourceDirectory>src</sourceDirectory>
    <plugins>
      <plugin>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.8.0</version>
        <configuration>
          <source>1.8</source>
          <target>1.8</target>
        </configuration>
      </plugin>
    </plugins>
  </build>
  <dependencies>
  	<dependency>
  		<groupId>org.apache.jena</groupId>
  		<artifactId>apache-jena-libs</artifactId>
  		<version>3.14.0</version>
  		<type>pom</type>
  	</dependency>
  </dependencies>
</project>