rename akka-docs dir to docs (#62)

docs/src/test/java/jdocs/config/ConfigDocTest.java

@@ -0,0 +1,70 @@
+/*
+ * Copyright (C) 2009-2022 Lightbend Inc. <https://www.lightbend.com>
+ */
+
+package jdocs.config;
+
+// #imports
+import org.apache.pekko.actor.typed.ActorSystem;
+import org.apache.pekko.actor.typed.Behavior;
+import org.apache.pekko.actor.typed.javadsl.Behaviors;
+import com.typesafe.config.Config;
+import com.typesafe.config.ConfigFactory;
+
+// #imports
+import org.apache.pekko.actor.testkit.typed.javadsl.ActorTestKit;
+
+public class ConfigDocTest {
+
+  private Behavior<Void> rootBehavior = Behaviors.empty();
+
+  public void customConfig() {
+    // #custom-config
+    Config customConf = ConfigFactory.parseString("akka.log-config-on-start = on");
+    // ConfigFactory.load sandwiches customConfig between default reference
+    // config and default overrides, and then resolves it.
+    ActorSystem<Void> system =
+        ActorSystem.create(rootBehavior, "MySystem", ConfigFactory.load(customConf));
+    // #custom-config
+
+    ActorTestKit.shutdown(system);
+  }
+
+  public void compileOnlyPrintConfig() {
+    // #dump-config
+    ActorSystem<Void> system = ActorSystem.create(rootBehavior, "MySystem");
+    system.logConfiguration();
+    // #dump-config
+  }
+
+  public void compileOnlySeparateApps() {
+    // #separate-apps
+    Config config = ConfigFactory.load();
+    ActorSystem<Void> app1 =
+        ActorSystem.create(rootBehavior, "MyApp1", config.getConfig("myapp1").withFallback(config));
+    ActorSystem<Void> app2 =
+        ActorSystem.create(
+            rootBehavior,
+            "MyApp2",
+            config.getConfig("myapp2").withOnlyPath("akka").withFallback(config));
+    // #separate-apps
+  }
+
+  public ActorSystem createConfiguredSystem() {
+    // #custom-config-2
+    // make a Config with just your special setting
+    Config myConfig = ConfigFactory.parseString("something=somethingElse");
+    // load the normal config stack (system props,
+    // then application.conf, then reference.conf)
+    Config regularConfig = ConfigFactory.load();
+    // override regular stack with myConfig
+    Config combined = myConfig.withFallback(regularConfig);
+    // put the result in between the overrides
+    // (system props) and defaults again
+    Config complete = ConfigFactory.load(combined);
+    // create ActorSystem
+    ActorSystem system = ActorSystem.create(rootBehavior, "myname", complete);
+    // #custom-config-2
+    return system;
+  }
+}