First commit

.gitignore

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+## IDEA ##
+.idea/
+out/
+*.iml
+*.ipr
+*.iws
+*.ids
+
+## ECLIPSE ##
+.settings/
+bin/
+.classpath
+.project
+
+## GRADLE ##
+.gradle/
+build/
+gradle/
+gradlew
+gradlew.bat
+
+## MAVEN ##
+target/
+
+## OTHER ##
+lib/
+

pom.xml

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+<?xml version="1.0" encoding="UTF-8"?>
+<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>ru.dmitriymx.reactjs</groupId>
+    <artifactId>reactjs-example</artifactId>
+    <version>0.1-SNAPSHOT</version>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <java.version>1.8</java.version>
+    </properties>
+
+    <dependencies>
+    </dependencies>
+
+    <build>
+        <finalName>${project.artifactId}-${project.version}</finalName>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.5.1</version>
+                <configuration>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
+                    <encoding>${project.build.sourceEncoding}</encoding>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>2.15</version>
+                <configuration>
+                    <argLine>-Dfile.encoding=${project.build.sourceEncoding}</argLine>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+</project>

src/main/java/ru/dmitriymx/reactjs/JsTools.java

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+/*
+ * DmitriyMX <mail@dmitriymx.ru>
+ * 2017-03-06
+ */
+package ru.dmitriymx.reactjs;
+
+import javax.script.Invocable;
+import javax.script.ScriptEngine;
+import javax.script.ScriptEngineManager;
+import javax.script.ScriptException;
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.net.URL;
+import java.net.URLConnection;
+import java.util.function.Function;
+
+public class JsTools {
+    private static ScriptEngine engine;
+
+    public static ScriptEngine getScriptEngine() {
+        if (engine == null) {
+            engine = new ScriptEngineManager().getEngineByName("nashorn");
+            try {
+                engine.eval("var global = this;");
+                engine.eval("var console = {}; console.debug = print; " +
+                        "console.warn = print; console.log = print; console.info = print;");
+            } catch (ScriptException e) {
+                e.printStackTrace();
+                engine = null;
+            }
+        }
+        return engine;
+    }
+
+    public static void loadJsFromUrl(String url) throws IOException, ScriptException {
+        URL _url = new URL(url);
+        URLConnection connection = _url.openConnection();
+        InputStreamReader reader = new InputStreamReader(connection.getInputStream());
+        getScriptEngine().eval(reader);
+        reader.close();
+    }
+
+    public static void loadJsFromClasspath(String path) throws ScriptException, IOException {
+        InputStreamReader reader = new InputStreamReader(Sample1.class.getResourceAsStream(path));
+        getScriptEngine().eval(reader);
+        reader.close();
+    }
+
+    public static Object invokeFunction(String functionName, Object... args) {
+        try {
+            return ((Invocable) getScriptEngine()).invokeFunction(functionName, args);
+        } catch (ScriptException | NoSuchMethodException e) {
+            throw new RuntimeException(e);
+        }
+    }
+
+    public static <T> T invokeFunction(String functionName, Function<Object, T> converter, Object... args) {
+        return converter.apply(invokeFunction(functionName, args));
+    }
+}

src/main/java/ru/dmitriymx/reactjs/Sample1.java

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+/*
+ * DmitriyMX <mail@dmitriymx.ru>
+ * 2017-03-06
+ */
+package ru.dmitriymx.reactjs;
+
+import static ru.dmitriymx.reactjs.JsTools.*;
+
+import javax.script.ScriptException;
+import java.io.IOException;
+
+public class Sample1 {
+    public static void main(String[] args) {
+        try {
+            log("Load js");
+            loadJsFromUrl("https://cdnjs.cloudflare.com/ajax/libs/react/15.4.2/react.min.js");
+            loadJsFromUrl("https://cdnjs.cloudflare.com/ajax/libs/react/15.4.2/react-dom-server.min.js");
+            loadJsFromClasspath("/app.js");
+
+            log("Call function");
+            String result = invokeFunction("renderOnServer", String::valueOf);
+
+            log("Result:\n%s", result);
+        } catch (ScriptException | IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private static void log(String format, Object... objects) {
+        System.err.printf(format+"\n", objects);
+    }
+}

src/main/resources/app.js

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+
+
+function renderOnServer() {
+    return ReactDOMServer.renderToString(
+        React.createElement("h2", null, "Hello world")
+    );
+}
+
+function renderOnClient() {
+    ReactDOM.render(
+        React.createElement("h2", null, "Hello world"),
+        document.getElementById('app')
+    );
+}