Polyglot Applications with GraalVM

POLYGLOT
WITH
GRAALVM
O S C O N 2 0 1 9 / M I C H A E L H U N G E R / @ M E S I R I I

MICHAEL
HUNGER
Caretaker General,
Neo4j
Head of Neo4j Labs
Disturber of the Peace
Java Champion
(graphs)-[:ARE]->(everywhere)
Twitter & Medium: @mesirii

WRITING
ABOUT
GRAAL
SINCE
2014

WARNING:
WHIRLWIND
TOUR
DONT‘T
READ THE
CODE

POLYGLOT?
NOT EVERYONE IS A JAVA
DEVELOPER!

POLYGLOT?
We have:
• Isn‘t the JVM already polyglot?
–Scala, Groovy, Kotlin, Clojure,
Frege …
–JRuby, Jython, … L
We want:
• More languages, better
performance

WHATS IN
FOR ME?• Better JVM performance
• Maintainable JIT compiler
• Faster evolution of Java
• With Truffle Language Runtime
–Run JavaScript, Ruby, R, Python,
LLVM code efficiently on the JVM
• With Substrate VM
–Binaries for Language Runtimes
–AOT compiled native images of
your applications
Lego box

GETTING
STARTED
WHO READS THE
INSTRUCTIONS

HOW CAN
I USE IT?• Dedicated GraalVM Download
or using sdkman
gu (graal-updater) Utility
js/node, ruby, python, R runtimes
native-image tool
• Java 11 with command line flags
-XX:+UnlockExperimentalVMOptions
-XX:+EnableJVMCI -XX:+UseJVMCICompiler
https://www.graalvm.org/downloads/

JAVA 11
sdk use java 11.0.1-open
java -Diterations=3
CountUppercase
I‘m happy to be back in Portland,
OR for OSCON 2019
-XX:+UnlockExperimentalVMOptions
-XX:+UseJVMCICompiler
-Dgraal.PrintCompilation=true

GRAALVMsdk install java 19.1.0-grl
gu install R python ruby native-image
gu list
ComponentId Version Component name
-----------------------------------
graalvm 19.1.0 GraalVM Core
R 19.1.0 FastR
native-image 19.1.0 Native Image
python 19.1.0 Graal.Python
ruby 19.1.0 TruffleRuby
java –version
OpenJDK 64-Bit GraalVM CE 19.1.0 (build
25.212-b03-jvmci-20-b04, mixed mode)
Lego Instructions built

PYTHON
# graalpython fac.py 2500
import sys
def fac(n):
if n==1: return 1
else: return fac(n-1)*n
x = int(sys.argv[1])
print("Factorial for {} is {}"
.format(x,fac(x)))

LLVM
BITCODE#include <stdio.h>
int main() {
printf("Hello from
GraalVM!n");
return 0;
}
clang -c -O1 -emit-llvm hello.c
lli hello.bc

R PLOTTINGR --version:graalvm
data <- "https://raw.githubusercontent.com/selva86/datasets/master/proglanguages.csv"
library(ggplot2)
library(treemapify)
proglangs <- read.csv(data)
ggplot(proglangs,
aes(area = value, fill = parent,
label = id, subgroup = parent)) +
geom_treemap() +
geom_treemap_subgroup_border() +
geom_treemap_subgroup_text() +
geom_treemap_text()

JS POLYGLOT
node --version:graalvm
node --jvm
const BigInteger =
Java.type("java.math.BigInteger")
let a = new BigInteger("10")
.add(new BigInteger("8")
.multiply(new BigInteger("4")))
console.log(a.toString())
> 42

GRAAL
COMPILER
OPTIMIZING COMPILER
IN JAVA

VISION STATEMENT
Create an extensible, modular, dynamic,
and aggressive compiler using object-
oriented and reflective Java programming, a graph-
based and visualizable intermediate representation,
and Java snippets.
—ThomasWürthinger

G R A A L ! ?
• JIT-Compiler implemented in Java !?!
• Aggressively optimizing
–e.g. inlining POJOS/DTOS
–Inlining streams
–Speeds up many typical Java/Scala
programs
• Uses compute graph for
optimization
• New compiler interface (JVMCI)

GRAALVM
BOX OF JOY
GRAAL ❤ TRUFFLE ❤ SUBSTRATE

GraalVM is a high-performance,
embeddable, polyglotVirtual Machine for
running applications written in JavaScript,
Python, Ruby, R, JVM-based languages like
Java, Scala, Kotlin, and LLVM-based
languages such as C and C++.
Additionally, GraalVM allows efficient
interoperability between programming
languages and compiling Java applications
ahead-of-time into native executables for
faster startup time and lower memory
overhead. https://github.com/oracle/graal/releases
BIGGER ON
THE INSIDE

• Collection of Research Projects
– TruffleRuby / FastR
• Maxine (Research)VM in Java
• „A Joke?“
• „Java-on-Java“ John Rose
– Project Metropolis
• Power Combo:
– Substrate-VM
– Truffle
– Graal Compiler
– AOT Compilation
HISTORY

GRAALVM
• Oracle Labs Project
• Versions
– 19.1.1 (quarterly release)
• Integrated
– JVM 1.8.x
– Node.js 10.x / ECMAScript 2019
– LLVM bitcode runtime
• Supports
– Truffle Runtime
– Language Packs (via gu)
– Native Image AOT
• Editions
– Community (GPL v2 w/ CP-Exception
– Enterprise (faster, sandboxing, commercial
support)
– Oracle Database Engine

NATIVE IMAGE
MACHINE CODE BABY

NATIVE
IMAGE
• Aggressive Ahead of time compilation (AOT)
• Extremely fast startup time
• Small binary executables for current OS
• Class initialization during build
• For FaaS, Commandline
• Microservices: Micronaut, Helidon, Quarkus,
Spring (soon)
• No classloading / class metadata
• Limitations:
– no reflection, no later classloading, no initializer
dynamics
– Slow build
https://medium.com/graalvm/lightweight-cloud-native-java-applications-
35d56bc45673

TRUFFLE
L A N G U A G E R U N T I M E

TRUFFLE
• Language Runtime
• API & Type system
• Implement language constructs
• Annotated Java Methods
– Tooling,Testing
• Generic or specialized operations

TRUFFLE
GRAAL• Integrates with Graal Compiler
• Partial Evaluation
• Optimize special cases based on
steady state assumption
• Deoptimize (trap) on failed
assumptions

SAMPLE
LANGUAGE
T R U F F L E E X A M P L E L A N G U A G E

TRUFFLE: ADDITION-NODE (SL)
@NodeInfo(shortName = "+")
public abstract class SLAdditionNode extends SLBinaryNode {
@Fallback
protected Object typeError(Object left, Object right) {
throw SLException.typeError(this, left, right); }
@Specialization(rewriteOn = ArithmeticException.class)
protected long add(long left, long right) {
return Math.addExact(left, right);
}
@Specialization @TruffleBoundary
protected SLBigNumber add(SLBigNumber left, SLBigNumber right) {
return new SLBigNumber(left.getValue().add(right.getValue()));
}
@Specialization(guards = "isString(left, right)") @TruffleBoundary
protected String add(Object left, Object right) {
return left.toString() + right.toString();
}
protected boolean isString(Object a, Object b) {…}

JAVASCRIP
T
• Main target language via graaljs
• Replacement for Rhino/Nashorn
• EcmaScript 2019 & Node.js
(10.15.2) compat
• 90% of 95k npm packages
• Graaljs can run slowly w/o Graal
• ScriptEngine support
• org.graalvm.js:js/js-scriptengine
https://www.graalvm.org/docs/reference-manual/languages/js/

GRAAL
PYTHON
• Early stage support Python 3.7
• Goal: „SciPy“ support
• No python debugger, but
GraalVMs
https://www.graalvm.org/docs/reference-manual/languages/python/

FAST-R
• Compatible with GNU R (3.5.1)
• Much faster than other R
implementations
• R/Rscript
• Install packages (e.g. ggplot2, Shiny)
• Minimal: graphics package
• Compatibility checker
• Tools (debugger, profiler)
• Java based Graphics
https://www.graalvm.org/docs/reference-manual/languages/r/

TRUFFLE
RUBY
• Initial research project
• Quite complete coverage (2.6.2)
incl. c-extensions
• Parallel threads
• Faster than MRI/JRuby (up to 31x)
• Recent: fibers
• Missing: suspend, continuation, fork
https://www.graalvm.org/docs/reference-manual/languages/ruby/

LLVM
• LLVM 6.0.0 Bitcode
• Via Sulong a LLVM implementation
in Java via Truffle
• Can use native libraries
• lli to execute LLVM Bitcode
• Sandbox in GraalVM Enterprise
– sandbox libraries
– virtualize syscalls
– memory on managed heap
https://medium.com/graalvm/safe-and-sandboxed-execution-of-
native-code-f6096b35c360

POLYGLOT
DO WHAT YOU WANT
THURSDAY

TRUFFLE
• Based on Truffle Implementations
of dynamic languages
• Joint underlying API / Typesystem
• Context
– eval
– bind
– invoke
• Source
• Value.*
docs.oracle.com/en/graalvm/enterprise/19/sdk/org/graalvm/polyglot/Context.html

VALUE
• The „Any“ type across languages
– Scalar
– List/Array
– Host/Proxy Object w/ Members
– Function/Invoke/Executable
• Provides some semantics and
conversions
• Removes need for (de)serialization
• Thread safety depends on language
support
docs.oracle.com/en/graalvm/enterprise/19/sdk/org/graalvm/polyglot/Value.html

CAPABILITIES
Polyglot support: --polyglot
Eval
• Polyglot.eval("python","21*2")
• polyglot.eval(language="ruby",
file="./my_ruby_file.rb")
Export / Import
• polyglot.import_value(„name“)
• Polyglot.export_value(„name“,value)
• ctx.getBindings.put/getMember(name,value)
Object Access
• Object.size() / call / invoke
• Object[name] /
• Via Value.*

JAVA INTEROP
JVM Support: --jvm Flag
Import
Java.import “java.util.UUID“
java.type("java.math.BigInteger")
from java.util import ArrayList
Helpers
• isFunction / isObject / isSymbol / isNull
/ instance_of
Access
• allow<Host/Native/Polyglot/*>Access

POLYGLOT EXAMPLE (1)
// gu install ruby python R
// groovy PolyTest1.groovy
@Grab("org.graalvm.sdk:graal-sdk:19.1.0")
import org.graalvm.polyglot.*
ctx = Context.newBuilder().allowAllAccess(true).build()
ctx.eval("js", "print('Hello JavaScript!');")
ctx.eval("R", "print('Hello R!');");
ctx.eval("ruby", "puts 'Hello Ruby!'");
ctx.eval("python", "print('Hello Python!')");

POLYGLOT EXAMPLE (PYTHON-JAVA)
import java
generic = java.type('org.testcontainers.containers.GenericContainer')
container = generic('nginx')
container.setExposedPorts([80])
container.start();
print('%s:%s' % (container.getContainerIpAddress(),
container.getMappedPort(80)));
https://medium.com/graalvm/using-testcontainers-from-a-node-js-application-3aa2273bf3bb

POLYGLOT EXAMPLE (C)
#include <stdio.h>
#include <curl/curl.h>
long request() {
CURL *curl = curl_easy_init();
long response_code = -1;
if(curl) {
CURLcode res;
curl_easy_setopt(curl, CURLOPT_URL, "http://example.com");
res = curl_easy_perform(curl);
if(res == CURLE_OK) {
curl_easy_getinfo(curl, CURLINFO_RESPONSE_CODE, &response_code);
}
curl_easy_cleanup(curl);
}
return response_code;
}

POLYGLOT EXAMPLE (JAVA+C-LLVM)
// clang -c -O1 -emit-llvm use-curl.c && groovy CurlTest.groovy
@Grab("org.graalvm.sdk:graal-sdk:1.9.10")
import org.graalvm.polyglot.*
polyglot = Context.newBuilder()
.allowAllAccess(true)
.option("llvm.libraries", "/usr/lib/libcurl.dylib")
.build()
source = Source
.newBuilder("llvm", new File("use-curl.bc"))
.build()
result = polyglot.eval(source)
responseValue = result.getMember("request").execute()
responseCode = responseValue.asLong()
print(responseCode)

R+PYTHON
pycode <-
‚
library polyglot
PI=polyglot.import("PI")
def area(radius):
return 2*radius*PI
area
'
export("PI",pi)
area <- eval.polyglot("python",pycode)
print(area(5))

JAVA+R
@Value(value = "classpath:plot.R") private Resource rSource;
@Autowired private Function<DataHolder, String> plotFunction;
@Bean
Function<DataHolder, String> getPlotFunction(@Autowired Context ctx) {
Context ctx = Context.newBuilder().allowAllAccess(true).build();
Source source = Source.newBuilder("R", rSource.getURL()).build();
return ctx.eval(source).as(Function.class);
}
@RequestMapping(value = "/load", produces = "image/svg+xml")
public synchronized ResponseEntity<String> load() {
HttpHeaders responseHeaders = new HttpHeaders();
responseHeaders.set("Refresh", "1");
double load = getOperatingSystemMXBean().getSystemLoadAverage();
String svg = plotFunction.apply(new DataHolder(load));
return new ResponseEntity<String>(svg,responseHeaders,HttpStatus.OK);
}

POLYGLOT EXAMPLE (JAVA+R)
library(ggplot2)
data <<- numeric(100)
function(dataHolder) {
svg()
data <<-
c(data[2:100],dataHolder$value)
plot <- ggplot(data=
data.frame(systemLoad=data,
time =-99:0),
aes(x=time, y=systemLoad, group=1)) +
geom_line(color="orange") +
expand_limits(x=0, y=0)
print(plot)
svg.off()
}

POLYGLOT SHELL
Context context = Context.newBuilder().allowAllAccess(true).build();
Set<String> languages = context.getEngine().getLanguages().keySet();
out.println("Shell for " + languages + ":");
String language = languages.iterator().next();
while (true) {
out.print(language + "> ");
String line = input.readLine();
if (line == null) break;
else if (languages.contains(line)) language = line;
else {
Source source = Source.newBuilder(language, line, "<shell>")
.interactive(true).buildLiteral();
context.eval(source);
}
}

POLYGLOT
OPTIONS
Print GraalVM version information and exit.
--version:graalvm
Print GraalVM version information and continue execution.
--show-version:graalvm
Start with Debugger
--inspect
Run using the native launcher with limited Java access
--native
Run on the JVM with Java access.
--jvm
Run with all other guest languages accessible.
--polyglot
Pass options to the host VM
--vm.[option]
Options for all installed languages, tools, host VM
--help:languages,tools,vm,expert
Internal options for debugging language impl and tools.
--help:internal

TOOLING
MAKING OUR LIFES EASIER

EXTENDING
DATABASES
MORE POWER TO THE
MACHINE

WHY?
• Allow “programmatic“ extensions
• Move processing to data, avoid network
transfers
• Not just procedures in
– PL/SQL
– Java
• Reuse existing code
– public packages (e.g. validators, data
science, visualization)
– domain specific code
• Because you can!

EXTENDING
DATABASES• „Multilingual Engine“
– native library integration
• Available from Oracle Labs
• For Oracle and MySQL
• Deploy custom functions in JavaScript,
R, Python with dbjs
dbjs deploy -u <user> -p <pass>
-c localhost:1521/ORCLCDB <package>
• Create statically and call from SQL
https://www.graalvm.org/docs/examples/mle-oracle/

SQL FUNCTION IN JAVASCRIPT
CREATE OR REPLACE JAVASCRIPT SOURCE NAMED "hello.js" AS
module.exports.greet = function(a) { return "Hello " + a; };
CREATE OR REPLACE FUNCTION greet(a IN VARCHAR2) RETURN VARCHAR2 AS
LANGUAGE JAVASCRIPT NAME 'hello.js.greet(a string) return string‘;
SELECT greet('GraalVM') FROM DUAL;
Hello GraalVM

NEO4J
(GRAPHS)-[:ARE]->(EVERYWHERE)

NEO4J IN
A TWEET@Neo4j is an open-source native
graph database designed to store,
manage and query highly connected
data efficiently with the Cypher
Query Language.
It runs transactional and analytic
workloads, supports visualization
and is extendable with custom
functions.
neo4j.com/developer

NEO4J
• Runs on the JVM
• Full Stack database
• Declarative Graph Query
Language
• Binary Protocol
• Drivers for most languages
• Visual Browser
• Integrations like GraphQL, Kafka
• Custom Procedures and Functions

OSCON CONFERENCE GRAPH
https://github.com/neo4j-examples/oscon-graph

TALK RECOMMENDATION
// top 10 talks (that I‘ve not see)
// that peers who like the same talks I did also liked
MATCH (me:User {name:“Michael“})
-[:FAVORITED]->(:Event)<-[:FAVORITED]-(peer:User)
-[:FAVORITED]->(reco:Event)
WHERE NOT (me)-[:FAVORITED]->(reco)
RETURN reco.name, count(*) AS freq
ORDER BY freq DESC LIMIT 10

NEO4J
CUSTOM
PROCEDURES
P U T YO U R S M A RT S I N T H E DATA B A S E

NEO4J
CUSTOM
FUNCTIONS• Annotated Java Methods
• Loaded at startup
• Computation or Aggregation
with Functions
• Data processing & streaming with
Procedures
• Accessible from Cypher Query
Language

CUSTOM FUNCTION
@UserFunction
@Description(„Generates an UUID“)
public String uuid() {
return UUID.randomUUID().toString();
}
CREATE (:Event {id: uuid(),
name:“Graph Algorithms“ });

POLYGLOT
FUNCTIONS
U S I N G T R U F F L E A P I S & G R A A L V M

POLYGLOT
FUNCTIONS
• Using Truffle API
• Declare + invoke function with
params, or
• Execute code with bindings
1. Use Context to run polyglot code
2. Use Cypher to declare dynamic
language functions
3. Install language files from directory
4. Store code in db to restore at
restart / in cluster

EVAL CODE
A D H O C E X E C U T I O N

EVAL CODE PROCEDURE
@Procedure(„scripts.execute“)
public Object executeCode(String lang, String code,
Map<String,Object> props) {
Context ctx =
Context.newBuilder().allowAllAccess(true).build();
Bindings bindings = ctx.getBindings();
props.forEach(bindings::putMember);
bindings.putMember("label",
ctx.eval("js", "s => org.neo4j.graphdb.Label.label(s)"));
bindings.putMember("db", graphDatabase);
return ctx.eval(lang, code).asHostObject();
}

EVAL CODE
CALL scripts.execute('
Java.import "org.neo4j.graphdb.Label
db = Polyglot.import("db")
props = db.findNode(Label.label("Event"),
"name",“OSCON")
.getAllProperties().entrySet().toArray()
Polyglot.as_enumerable(props)
.map{|e| "#{e.getKey()} -> #{e.getValue()}"}
.join(",")
',{},'ruby')

REGISTER
FUNCTIONS
DY N A M I C A L LY

INSTALL FUNCTION (2)
Context ctx =
Context.newBuilder().allowAllAccess(true).build()
@Procedure(„scripts.register“)
public void registerFunction(String lang,
String name, String code) {
Value function = ctx.eval(lang, code);
ctx.getBindings(lang)
.putMember(name, function);
}

INVOKE EXISTING FUNCTION (2)
@UserFunction(„scripts.run“)
public Object executeFun(String lang,
String name, Object…args) {
return ctx.getBindings(lang)
.getMember(name)
.execute(params).asHostObject();
}

REGISTER NATIVE FUNCTION (2)
@UserFunction
public void registerFunction(String code, String name, String lang) {
ctx.getBindings(lang).putMember(name, ctx.eval(code));
procedures.register(new BasicUserFunction(signature(name)) {
@Override
public AnyValue apply(org.neo4j.proc.Context c, AnyValue[] input) {
return resultOf(context.getBindings(lang).getMember(name)
.execute(paramsFor(input)));
}
});
}

SCRIPT
DIRECTORY
A U TO L O A D S C R I P T F I L E S

SOURCE WATCHER
watchService = FileSystems.getDefault().newWatchService();
pathName = new File(scriptsDir, target.getDirName())
pathToWatch = getTargetPath(pathName);
pathToWatch.register(watchService,
ENTRY_CREATE,ENTRY_DELETE, ENTRY_MODIFY);
public void run() {
WatchKey watchKey;
while ((watchKey = watchService.take()) != null) {
for (WatchEvent<?> event : watchKey.pollEvents())
updateScript(event.kind(), event.context());
}
}

IMPLEMENT SCRIPT FUNCTION (1)
public class ScriptFunction implements CallableUserFunction {
private final UserFunctionSignature signature;
private final String name;
private final String sourceCode;
private transient volatile Source source;
public ScriptFunction(String language, String name, String sourceCode) {
this.name = name;
this.sourceCode = sourceCode;
this.source = Source.newBuilder(this.language, this.sourceCode, this.name).build();
this.signature = generateSignature();
}
private UserFunctionSignature generateSignature() {
final QualifiedName qualifiedName = new QualifiedName(Arrays.asList("scripts", "fn"), name);
final List<FieldSignature> input = IntStream.range(0, numberOfArguments);
.mapToObj(i -> FieldSignature.inputField("p" + i, NTAny, DefaultParameterValue.nullValue(NTAny)))
.collect(toList());
return new UserFunctionSignature(qualifiedName, input, NTAny, null, new String[0], null, false);
}

@Override
public AnyValue apply(Context ctx, AnyValue[] input) throws ProcedureException {
try (org.graalvm.polyglot.Context context = PolyglotContext.newInstance()) {
GraphDatabaseAPI db = ctx.get(Context.DATABASE_API);
Log log = ctx.get(Context.DEPENDENCY_RESOLVER).resolveDependency(LogService.class)
.getUserLog(ScriptFunction.class);
Value bindings = context.getPolyglotBindings();
bindings.putMember("db", db);
bindings.putMember("log", log);
Value langBindings = context.getBindings(language);
langBindings.putMember(name, context.eval(source));
return resultFor(langBindings.getMember(name).invoke(input));
}
}

private AnyValue resultFor(Value result) {
if (result.isNull()) {
return null;
}
if (result.isNumber()) {
return ValueUtils.asAnyValue(result.asDouble());
}
if (result.isBoolean()) {
return ValueUtils.asAnyValue(result.asBoolean());
}
if (result.isHostObject()) {
return ValueUtils.asAnyValue(result.asHostObject());
}
return ValueUtils.asAnyValue(result.asString());
}

NEXT
STEPS• Better bi-directional conversions
• Handle Isolation / Threading
• Integrate with Python / R ~
– Graph processing / algorithms
– Data Science / ML / graph_net
– Large Scale Plotting
– Investigate GraphBlas (C-Library)
• Allow installing packages (e.g npm)
• Move into Neo4j Labs library

THE GOOD
• It works!
– All the languages
– JVM Interop
– Polyglot Interop
• Continuous improvements by the
Oracle Team
• Lots of great docs & articles
• Adding those database extensions
was really easy

THE BAD
• Python support still preliminary
• Too many polyglot indirections are
costly
• Interop a bit kludgy
• Error messages not that helpful
• No automatic mapping of
collection types (map/hash/dict)
and (list/collection) – only for
arrays

MORE• graalvm.org
• graalvm.org/docs
• medium.com/graalvm
~/graalvm-ten-things-12d9111f307d
• github.com/oracle/graal
• graalvm.org/docs/reference-manual/compatibility –
package compat checker
• youtu.be/a-XEZobXspo – 3hr deep dive
• neo4j.com/developer
• r.neo4j.com/algo-book
• github.com/neo4j-contrib/neo4j-script-procedures
Twitter & Medium: @mesirii

Graphs in AI and ML
Alicia Frame, Senior Data Scientist, Neo4j
Jake Graham, Lead Product Manager for AI and Graph Analytics
Intro to Neo4j for Developers
Jennifer Reif, Developer Relations Engineer, Neo4j
Neo4j Bolt Driver Architecture Now and inThe Future
Nigel Small,Tech Lead for Neo4j Drivers team
GRANDstack: Graphs ALL the Way Down
William Lyon, Software Engineer, Neo4j Labs
All-new SDN-RX: Reactive Spring Data Neo4j
Gerrit Meier, Software Engineer, Neo4j
Graph Embeddings
Alicia Frame, Senior Data Scientist, Neo4j
Graph ModelingTips andTricks
Max De Marzi, Field Engineer and Graph Expert, Neo4j
APOC Pearls -The bestTips andTricks
Michael Hunger, Director of Neo4j Labs
Visualizing Graph Data in JavaScript
Will Lyon, Software Engineer, Neo4j Labs
Creating a Data Marvel (Comics) with Spring and Neo4j
Jennifer Reif, Developer Relations Engineer, Neo4j
Keynote and Announcements
Emil Eifrem, CEO and Co-Creator of Neo4j
October 10
8am NYC, 1pm London, 530pm Mumbai

THANK YOU!
QUESTIONS IN HALLWAY

Polyglot Applications with GraalVM

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