Merge pull request eugenp#8281 from kamleshkr/BAEL-3525

glmartin · web-flow · commit 7cbea4a2585c · 2019-12-08T16:46:46.000-05:00
BAEL-3525: System.exit() vs Runtime.getRuntime().halt()
diff --git a/core-java-modules/core-java-jvm/src/main/java/com/baeldung/exitvshalt/JvmExitAndHaltDemo.java b/core-java-modules/core-java-jvm/src/main/java/com/baeldung/exitvshalt/JvmExitAndHaltDemo.java
@@ -0,0 +1,34 @@
+package com.baeldung.exitvshalt;
+
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+
+public class JvmExitAndHaltDemo {
+
+    private static Logger LOGGER = LoggerFactory.getLogger(JvmExitAndHaltDemo.class);
+
+    static {
+        Runtime.getRuntime()
+            .addShutdownHook(new Thread(() -> {
+                LOGGER.info("Shutdown hook initiated.");
+            }));
+    }
+
+    public void processAndExit() {
+        process();
+        LOGGER.info("Calling System.exit().");
+        System.exit(0);
+    }
+
+    public void processAndHalt() {
+        process();
+        LOGGER.info("Calling Runtime.getRuntime().halt().");
+        Runtime.getRuntime()
+            .halt(0);
+    }
+
+    private void process() {
+        LOGGER.info("Process started.");
+    }
+
+}
diff --git a/core-java-modules/core-java-jvm/src/test/java/com/baeldung/exitvshalt/JvmExitDemoUnitTest.java b/core-java-modules/core-java-jvm/src/test/java/com/baeldung/exitvshalt/JvmExitDemoUnitTest.java
@@ -0,0 +1,14 @@
+package com.baeldung.exitvshalt;
+
+import org.junit.Test;
+
+public class JvmExitDemoUnitTest {
+
+    JvmExitAndHaltDemo jvmExitAndHaltDemo = new JvmExitAndHaltDemo();
+
+    @Test
+    public void givenProcessComplete_whenExitCalled_thenTriggerShutdownHook() {
+        jvmExitAndHaltDemo.processAndExit();
+    }
+
+}
diff --git a/core-java-modules/core-java-jvm/src/test/java/com/baeldung/exitvshalt/JvmHaltDemoUnitTest.java b/core-java-modules/core-java-jvm/src/test/java/com/baeldung/exitvshalt/JvmHaltDemoUnitTest.java
@@ -0,0 +1,14 @@
+package com.baeldung.exitvshalt;
+
+import org.junit.Test;
+
+public class JvmHaltDemoUnitTest {
+
+    JvmExitAndHaltDemo jvmExitAndHaltDemo = new JvmExitAndHaltDemo();
+
+    @Test
+    public void givenProcessComplete_whenHaltCalled_thenDoNotTriggerShutdownHook() {
+        jvmExitAndHaltDemo.processAndHalt();
+    }
+
+}
