BAEL-812: List of Rules Engines in Java (#2319)

* spring beans DI examples

* fix-1: shortening examples

* List of Rules Engines in Java

* BAEL-812: Openl-Tablets example added

* BAEL-812: artifacts names changed

easy-rules/pom.xml

@@ -0,0 +1,15 @@
+<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>com.baeldung.easyrules</groupId>
+	<artifactId>easy-rules</artifactId>
+	<version>1.0.0-SNAPSHOT</version>
+
+	<dependencies>
+		<dependency>
+			<groupId>org.jeasy</groupId>
+		    <artifactId>easy-rules-core</artifactId>
+		    <version>3.0.0</version>
+		</dependency>
+	</dependencies>
+</project>

easy-rules/src/main/java/com/baeldung/easyrules/HelloWorldRule.java

@@ -0,0 +1,20 @@
+package com.baeldung.easyrules;
+
+import org.jeasy.rules.annotation.Action;
+import org.jeasy.rules.annotation.Condition;
+import org.jeasy.rules.annotation.Rule;
+
+@Rule(name = "Hello World rule", description = "Always say hello world")
+public class HelloWorldRule {
+
+    @Condition
+    public boolean when() {
+        return true;
+    }
+
+    @Action
+    public void then() throws Exception {
+        System.out.println("hello world");
+    }
+
+}

easy-rules/src/main/java/com/baeldung/easyrules/Launcher.java

@@ -0,0 +1,21 @@
+package com.baeldung.easyrules;
+
+import org.jeasy.rules.api.Facts;
+import org.jeasy.rules.api.Rules;
+import org.jeasy.rules.api.RulesEngine;
+import org.jeasy.rules.core.DefaultRulesEngine;
+
+public class Launcher {
+    public static void main(String... args) {
+        // create facts
+        Facts facts = new Facts();
+
+        // create rules
+        Rules rules = new Rules();
+        rules.register(new HelloWorldRule());
+
+        // create a rules engine and fire rules on known facts
+        RulesEngine rulesEngine = new DefaultRulesEngine();
+        rulesEngine.fire(rules, facts);
+    }
+}