add new core-java-os module

core-java-9/README.md

@@ -9,7 +9,6 @@
 - [Java 9 Convenience Factory Methods for Collections](http://www.baeldung.com/java-9-collections-factory-methods) 
 - [New Stream Collectors in Java 9](http://www.baeldung.com/java9-stream-collectors)
 - [Java 9 CompletableFuture API Improvements](http://www.baeldung.com/java-9-completablefuture)
-- [Java 9 Process API Improvements](http://www.baeldung.com/java-9-process-api)
 - [Introduction to Java 9 StackWalking API](http://www.baeldung.com/java-9-stackwalking-api)
 - [Introduction to Project Jigsaw](http://www.baeldung.com/project-jigsaw-java-modularity)
 - [Java 9 Optional API Additions](http://www.baeldung.com/java-9-optional)
@@ -25,7 +24,6 @@
 - [Iterate Through a Range of Dates in Java](https://www.baeldung.com/java-iterate-date-range)
 - [Initialize a HashMap in Java](https://www.baeldung.com/java-initialize-hashmap)
 - [Java 9 Platform Logging API](https://www.baeldung.com/java-9-logging-api)
-- [Guide to java.lang.Process API](https://www.baeldung.com/java-process-api)
 - [Immutable Set in Java](https://www.baeldung.com/java-immutable-set)
 - [Multi-Release Jar Files](https://www.baeldung.com/java-multi-release-jar)
 - [Ahead of Time Compilation (AoT)](https://www.baeldung.com/ahead-of-time-compilation)

core-java-os/.gitignore

@@ -0,0 +1,26 @@
+*.class
+
+0.*
+
+#folders#
+/target
+/neoDb*
+/data
+/src/main/webapp/WEB-INF/classes
+*/META-INF/*
+.resourceCache
+
+# Packaged files #
+*.jar
+*.war
+*.ear
+
+# Files generated by integration tests
+*.txt
+backup-pom.xml
+/bin/
+/temp
+
+#IntelliJ specific
+.idea/
+*.iml

core-java-os/README.md

@@ -0,0 +1,8 @@
+=========
+
+This module uses Java 9, so make sure to have the JDK 9 installed to run it.
+
+## 
+### Relevant Articles: 
+- [Java 9 Process API Improvements](http://www.baeldung.com/java-9-process-api)
+- [Guide to java.lang.Process API](https://www.baeldung.com/java-process-api)

core-java-os/pom.xml

@@ -0,0 +1,82 @@
+<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</groupId>
+    <artifactId>core-java-os</artifactId>
+    <version>0.1.0-SNAPSHOT</version>
+    <name>core-java-os</name>
+    <packaging>jar</packaging>
+
+    <parent>
+        <groupId>com.baeldung</groupId>
+        <artifactId>parent-java</artifactId>
+        <version>0.0.1-SNAPSHOT</version>
+        <relativePath>../parent-java</relativePath>
+    </parent>
+
+    <dependencies>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-collections4</artifactId>
+            <version>${commons-collections4.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>${commons-io.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.commons</groupId>
+            <artifactId>commons-lang3</artifactId>
+            <version>${commons-lang3.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>log4j</groupId>
+            <artifactId>log4j</artifactId>
+            <version>${log4j.version}</version>
+        </dependency>
+        <!-- test scoped -->
+        <dependency>
+            <groupId>org.assertj</groupId>
+            <artifactId>assertj-core</artifactId>
+            <version>${assertj.version}</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <finalName>core-java-os</finalName>
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+
+        <plugins>
+         <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>${maven-compiler-plugin.version}</version>
+                <configuration>
+                    <source>${maven.compiler.source}</source>
+                    <target>${maven.compiler.target}</target>
+                </configuration>
+            </plugin>
+        </plugins>
+    </build>
+
+    <properties>
+        <!-- util -->
+        <commons-lang3.version>3.5</commons-lang3.version>
+        <commons-collections4.version>4.1</commons-collections4.version>
+        <collections-generic.version>4.01</collections-generic.version>
+    
+        <!-- testing -->
+        <assertj.version>3.6.1</assertj.version>
+        <asspectj.version>1.8.9</asspectj.version>
+        <maven.compiler.source>1.9</maven.compiler.source>
+        <maven.compiler.target>1.9</maven.compiler.target>
+        <guava.version>25.1-jre</guava.version>
+    </properties>
+</project>

core-java-os/src/main/java/com/baeldung/java9/process/ProcessCompilationError.java

@@ -3,5 +3,5 @@ package com.baeldung.java9.process;
 public class ProcessCompilationError {
     //This method has been written to generate error to display 
     //how process errorStream() can consume error
-    public static void();
+    //public static void();
 }

core-java-os/src/main/resources/logback.xml

@@ -0,0 +1,13 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<configuration>
+    <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
+        <encoder>
+            <pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n
+            </pattern>
+        </encoder>
+    </appender>
+
+    <root level="INFO">
+        <appender-ref ref="STDOUT" />
+    </root>
+</configuration>

core-java-os/src/test/java/com/baeldung/java9/process/ProcessAPIEnhancementsUnitTest.java

@@ -18,13 +18,13 @@ import org.slf4j.LoggerFactory;
 
 public class ProcessAPIEnhancementsUnitTest {
 
-    Logger log = LoggerFactory.getLogger(ProcessAPIEnhancementsTest.class);
+    Logger log = LoggerFactory.getLogger(ProcessAPIEnhancementsUnitTest.class);
 
     @Test
     public void givenCurrentProcess_whenInvokeGetInfo_thenSuccess() throws IOException {
         ProcessHandle processHandle = ProcessHandle.current();
         ProcessHandle.Info processInfo = processHandle.info();
-        assertNotNull(processHandle.getPid());
+        assertNotNull(processHandle.pid());
         assertEquals(false, processInfo.arguments()
           .isPresent());
         assertEquals(true, processInfo.command()
@@ -51,7 +51,7 @@ public class ProcessAPIEnhancementsUnitTest {
           .start();
         ProcessHandle processHandle = process.toHandle();
         ProcessHandle.Info processInfo = processHandle.info();
-        assertNotNull(processHandle.getPid());
+        assertNotNull(processHandle.pid());
         assertEquals(false, processInfo.arguments()
           .isPresent());
         assertEquals(true, processInfo.command()
@@ -72,7 +72,7 @@ public class ProcessAPIEnhancementsUnitTest {
         Stream<ProcessHandle> liveProcesses = ProcessHandle.allProcesses();
         liveProcesses.filter(ProcessHandle::isAlive)
             .forEach(ph -> {
-                assertNotNull(ph.getPid());
+                assertNotNull(ph.pid());
                 assertEquals(true, ph.info()
                   .command()
                   .isPresent());
@@ -102,12 +102,12 @@ public class ProcessAPIEnhancementsUnitTest {
         Stream<ProcessHandle> children = ProcessHandle.current()
           .children();
         children.filter(ProcessHandle::isAlive)
-          .forEach(ph -> log.info("PID: {}, Cmd: {}", ph.getPid(), ph.info()
+          .forEach(ph -> log.info("PID: {}, Cmd: {}", ph.pid(), ph.info()
             .command()));
         Stream<ProcessHandle> descendants = ProcessHandle.current()
           .descendants();
         descendants.filter(ProcessHandle::isAlive)
-          .forEach(ph -> log.info("PID: {}, Cmd: {}", ph.getPid(), ph.info()
+          .forEach(ph -> log.info("PID: {}, Cmd: {}", ph.pid(), ph.info()
             .command()));
     }
 
@@ -121,12 +121,12 @@ public class ProcessAPIEnhancementsUnitTest {
           .start();
         ProcessHandle processHandle = process.toHandle();
 
-        log.info("PID: {} has started", processHandle.getPid());
+        log.info("PID: {} has started", processHandle.pid());
         CompletableFuture<ProcessHandle> onProcessExit = processHandle.onExit();
         onProcessExit.get();
         assertEquals(false, processHandle.isAlive());
         onProcessExit.thenAccept(ph -> {
-            log.info("PID: {} has stopped", ph.getPid());
+            log.info("PID: {} has stopped", ph.pid());
         });
     }
 

core-java-os/src/test/java/com/baeldung/java9/process/ProcessApiUnitTest.java

@@ -30,7 +30,7 @@ public class ProcessApiUnitTest {
     @Test
     public void processInfoExample() throws NoSuchAlgorithmException {
         ProcessHandle self = ProcessHandle.current();
-        long PID = self.getPid();
+        long PID = self.pid();
         ProcessHandle.Info procInfo = self.info();
         Optional<String[]> args = procInfo.arguments();
         Optional<String> cmd = procInfo.commandLine();
@@ -45,7 +45,7 @@ public class ProcessApiUnitTest {
 
         Stream<ProcessHandle> allProc = ProcessHandle.current().children();
         allProc.forEach(p -> {
-            System.out.println("Proc " + p.getPid());
+            System.out.println("Proc " + p.pid());
         });
 
     }
@@ -54,7 +54,7 @@ public class ProcessApiUnitTest {
     public void createAndDestroyProcess() throws IOException, InterruptedException {
         int numberOfChildProcesses = 5;
         for (int i = 0; i < numberOfChildProcesses; i++) {
-            createNewJVM(ServiceMain.class, i).getPid();
+            createNewJVM(ServiceMain.class, i).pid();
         }
 
         Stream<ProcessHandle> childProc = ProcessHandle.current().children();
@@ -62,10 +62,10 @@ public class ProcessApiUnitTest {
 
         childProc = ProcessHandle.current().children();
         childProc.forEach(processHandle -> {
-            assertTrue("Process " + processHandle.getPid() + " should be alive!", processHandle.isAlive());
+            assertTrue("Process " + processHandle.pid() + " should be alive!", processHandle.isAlive());
             CompletableFuture<ProcessHandle> onProcExit = processHandle.onExit();
             onProcExit.thenAccept(procHandle -> {
-                System.out.println("Process with PID " + procHandle.getPid() + " has stopped");
+                System.out.println("Process with PID " + procHandle.pid() + " has stopped");
             });
         });
 
@@ -73,14 +73,14 @@ public class ProcessApiUnitTest {
 
         childProc = ProcessHandle.current().children();
         childProc.forEach(procHandle -> {
-            assertTrue("Could not kill process " + procHandle.getPid(), procHandle.destroy());
+            assertTrue("Could not kill process " + procHandle.pid(), procHandle.destroy());
         });
 
         Thread.sleep(5000);
 
         childProc = ProcessHandle.current().children();
         childProc.forEach(procHandle -> {
-            assertFalse("Process " + procHandle.getPid() + " should not be alive!", procHandle.isAlive());
+            assertFalse("Process " + procHandle.pid() + " should not be alive!", procHandle.isAlive());
         });
 
     }

core-java-os/src/test/java/com/baeldung/java9/process/ProcessUnderstandingUnitTest.java

@@ -14,7 +14,7 @@ import java.lang.Integer;
 
 import org.junit.jupiter.api.Test;
 
-class ProcessUnderstandingTest {
+class ProcessUnderstandingUnitTest {
 
     @Test
     public void givenSourceProgram_whenExecutedFromAnotherProgram_thenSourceProgramOutput3() throws IOException {

core-java-os/src/test/resources/.gitignore

@@ -0,0 +1,13 @@
+*.class
+
+#folders#
+/target
+/neoDb*
+/data
+/src/main/webapp/WEB-INF/classes
+*/META-INF/*
+
+# Packaged files #
+*.jar
+*.war
+*.ear

pom.xml

@@ -379,6 +379,7 @@
                 <!-- <module>core-java-11</module> --> <!-- We haven't upgraded to java 11. Fixing in BAEL-10841 --> 
                 <module>core-java-8</module>
                 <!--<module>core-java-9</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
+                <!--<module>core-java-os</module> --> <!-- We haven't upgraded to java 9.-->
                 <module>core-java-arrays</module>
                 <module>core-java-collections</module>
                 <module>core-java-collections-list</module>
@@ -1015,6 +1016,7 @@
                 <!-- <module>core-java-11</module> --> <!-- We haven't upgraded to java 11. Fixing in BAEL-10841 --> 
                 <module>core-java-8</module>
                 <!--<module>core-java-9</module> --> <!-- We haven't upgraded to java 9. Fixing in BAEL-10841 -->
+                <!--<module>core-java-os</module> --> <!-- We haven't upgraded to java 9.-->
                 <module>core-java-arrays</module>
                 <module>core-java-collections</module>
                 <module>core-java-collections-list</module>