Java 9 new features (#660)
* initial push for core-java-9 tutorials * Fixed Maven build with experimental java 9 Maven compiler plug-in. Minor code changes * Running maven build and changes to some of tests. * Fixed maven build and modifications ot some tests * Removing unnecessary files
This commit is contained in:
anton-k11
Grzegorz Piwowarek
parent
98ffbc1f37
commit
c68e1bfbc8
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@ -0,0 +1,13 @@
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*.class
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#folders#
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/target
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/neoDb*
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/data
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/src/main/webapp/WEB-INF/classes
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*/META-INF/*
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# Packaged files #
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*.jar
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*.war
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*.ear
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=========
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## Core Java 9 Examples
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http://inprogress.baeldung.com/java-9-new-features/
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<project xmlns="http://maven.apache.org/POM/4.0.0"
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xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
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xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
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<modelVersion>4.0.0</modelVersion>
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<groupId>com.baeldung</groupId>
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<artifactId>core-java9</artifactId>
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<version>0.2-SNAPSHOT</version>
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<name>core-java9</name>
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<pluginRepositories>
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<pluginRepository>
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<id>apache.snapshots</id>
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<url>http://repository.apache.org/snapshots/</url>
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</pluginRepository>
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</pluginRepositories>
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<dependencies>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-api</artifactId>
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<version>${org.slf4j.version}</version>
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</dependency>
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<dependency>
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<groupId>org.hamcrest</groupId>
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<artifactId>hamcrest-library</artifactId>
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<version>${org.hamcrest.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>junit</groupId>
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<artifactId>junit</artifactId>
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<version>${junit.version}</version>
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<scope>test</scope>
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</dependency>
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<dependency>
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<groupId>org.mockito</groupId>
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<artifactId>mockito-core</artifactId>
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<version>${mockito.version}</version>
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<scope>test</scope>
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</dependency>
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</dependencies>
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<build>
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<finalName>core-java-9</finalName>
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<plugins>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-compiler-plugin</artifactId>
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<version>${maven-compiler-plugin.version}</version>
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<configuration>
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<source>1.9</source>
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<target>1.9</target>
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<verbose>true</verbose>
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<!-- <executable>C:\develop\jdks\jdk-9_ea122\bin\javac</executable>
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<compilerVersion>1.9</compilerVersion> -->
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</configuration>
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</plugin>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-surefire-plugin</artifactId>
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<version>${maven-surefire-plugin.version}</version>
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</plugin>
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</plugins>
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</build>
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<properties>
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<!-- logging -->
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<org.slf4j.version>1.7.13</org.slf4j.version>
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<logback.version>1.0.13</logback.version>
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<!-- maven plugins -->
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<!--
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<maven-war-plugin.version>2.6</maven-war-plugin.version>
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maven-compiler-plugin.version>3.5.1</maven-compiler-plugin.version> -->
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<maven-compiler-plugin.version>3.6-jigsaw-SNAPSHOT</maven-compiler-plugin.version>
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<maven-surefire-plugin.version>2.19.1</maven-surefire-plugin.version>
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<!-- testing -->
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<org.hamcrest.version>1.3</org.hamcrest.version>
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<junit.version>4.12</junit.version>
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<mockito.version>1.10.19</mockito.version>
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</properties>
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</project>
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*.class
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#folders#
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/target
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/neoDb*
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/data
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/src/main/webapp/WEB-INF/classes
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*/META-INF/*
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# Packaged files #
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*.jar
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*.war
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*.ear
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package com.baeldung.java9.language;
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public interface PrivateInterface {
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private static String staticPrivate() {
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return "static private";
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}
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private String instancePrivate() {
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return "instance private";
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}
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public default void check(){
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String result = staticPrivate();
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if (!result.equals("static private"))
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throw new AssertionError("Incorrect result for static private interface method");
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PrivateInterface pvt = new PrivateInterface() {
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};
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result = pvt.instancePrivate();
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if (!result.equals("instance private"))
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throw new AssertionError("Incorrect result for instance private interface method");
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}
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}
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package com.baeldung.java9.process;
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import java.io.File;
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import java.io.IOException;
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import java.security.NoSuchAlgorithmException;
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import java.security.SecureRandom;
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import java.time.Duration;
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import java.time.Instant;
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import java.util.stream.Stream;
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public class ProcessUtils {
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public static String getClassPath(){
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String cp = System.getProperty("java.class.path");
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System.out.println("ClassPath is "+cp);
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return cp;
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}
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public static File getJavaCmd() throws IOException{
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String javaHome = System.getProperty("java.home");
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File javaCmd;
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if(System.getProperty("os.name").startsWith("Win")){
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javaCmd = new File(javaHome, "bin/java.exe");
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}else{
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javaCmd = new File(javaHome, "bin/java");
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}
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if(javaCmd.canExecute()){
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return javaCmd;
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}else{
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throw new UnsupportedOperationException(javaCmd.getCanonicalPath() + " is not executable");
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}
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}
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public static String getMainClass(){
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return System.getProperty("sun.java.command");
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}
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public static String getSystemProperties(){
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StringBuilder sb = new StringBuilder();
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System.getProperties().forEach((s1, s2) -> sb.append(s1 +" - "+ s2) );
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return sb.toString();
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}
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}
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package com.baeldung.java9.process;
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import java.util.Optional;
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public class ServiceMain {
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public static void main(String[] args) throws InterruptedException {
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ProcessHandle thisProcess = ProcessHandle.current();
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long pid = thisProcess.getPid();
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Optional<String[]> opArgs = Optional.ofNullable(args);
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String procName = opArgs.map(str -> str.length > 0 ? str[0] : null).orElse(System.getProperty("sun.java.command"));
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for (int i = 0; i < 10000; i++) {
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System.out.println("Process " + procName + " with ID " + pid + " is running!");
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Thread.sleep(10000);
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}
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}
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}
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<configuration>
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<appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender">
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<encoder>
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<pattern>web - %date [%thread] %-5level %logger{36} - %message%n
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</pattern>
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</encoder>
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</appender>
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<!-- <logger name="org.springframework" level="WARN" /> -->
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<root level="INFO">
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<appender-ref ref="STDOUT"/>
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</root>
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</configuration>
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package com.baeldung.java9;
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import static org.junit.Assert.assertTrue;
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import static org.junit.Assert.assertEquals;
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import static org.junit.Assert.assertSame;
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import java.awt.Image;
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import java.awt.image.BaseMultiResolutionImage;
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import java.awt.image.BufferedImage;
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import java.awt.image.MultiResolutionImage;
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import java.util.List;
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import org.junit.Test;
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public class MultiResultionImageTest {
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@Test
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public void baseMultiResImageTest() {
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int baseIndex = 1;
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int length = 4;
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BufferedImage[] resolutionVariants = new BufferedImage[length];
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for (int i = 0; i < length; i++) {
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resolutionVariants[i] = createImage(i);
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}
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MultiResolutionImage bmrImage = new BaseMultiResolutionImage(baseIndex, resolutionVariants);
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List<Image> rvImageList = bmrImage.getResolutionVariants();
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assertEquals("MultiResoltion Image shoudl contain the same number of resolution variants!", rvImageList.size(), length);
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for (int i = 0; i < length; i++) {
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int imageSize = getSize(i);
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Image testRVImage = bmrImage.getResolutionVariant(imageSize, imageSize);
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assertSame("Images should be the same", testRVImage, resolutionVariants[i]);
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}
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}
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private static int getSize(int i) {
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return 8 * (i + 1);
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}
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private static BufferedImage createImage(int i) {
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return new BufferedImage(getSize(i), getSize(i),
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BufferedImage.TYPE_INT_RGB);
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}
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}
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package com.baeldung.java9.httpclient;
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import static java.net.HttpURLConnection.HTTP_OK;
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import static org.junit.Assert.assertTrue;
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import java.io.IOException;
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import java.net.CookieManager;
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import java.net.CookiePolicy;
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import java.net.URI;
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import java.net.URISyntaxException;
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import java.net.http.HttpClient;
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import java.net.http.HttpHeaders;
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import java.net.http.HttpRequest;
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import java.net.http.HttpResponse;
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import java.security.NoSuchAlgorithmException;
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import java.util.List;
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import java.util.Map;
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import java.util.concurrent.CompletableFuture;
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import java.util.concurrent.ExecutionException;
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import javax.net.ssl.SSLContext;
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import javax.net.ssl.SSLParameters;
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import org.junit.Before;
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import org.junit.Test;
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public class SimpleHttpRequestsTest {
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private URI httpURI;
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@Before
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public void init() throws URISyntaxException {
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httpURI = new URI("http://www.baeldung.com/");
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}
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@Test
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public void quickGet() throws IOException, InterruptedException, URISyntaxException {
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HttpRequest request = HttpRequest.create( httpURI ).GET();
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HttpResponse response = request.response();
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int responseStatusCode = response.statusCode();
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String responseBody = response.body(HttpResponse.asString());
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assertTrue("Get response status code is bigger then 400", responseStatusCode < 400);
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}
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@Test
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public void asynchronousGet() throws URISyntaxException, IOException, InterruptedException, ExecutionException{
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HttpRequest request = HttpRequest.create(httpURI).GET();
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long before = System.currentTimeMillis();
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CompletableFuture<HttpResponse> futureResponse = request.responseAsync();
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futureResponse.thenAccept( response -> {
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String responseBody = response.body(HttpResponse.asString());
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});
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HttpResponse resp = futureResponse.get();
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HttpHeaders hs = resp.headers();
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assertTrue("There should be more then 1 header.", hs.map().size() >1);
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}
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@Test
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public void postMehtod() throws URISyntaxException, IOException, InterruptedException {
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HttpRequest.Builder requestBuilder = HttpRequest.create(httpURI);
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requestBuilder.body(HttpRequest.fromString("param1=foo,param2=bar")).followRedirects(HttpClient.Redirect.SECURE);
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HttpRequest request = requestBuilder.POST();
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HttpResponse response = request.response();
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int statusCode = response.statusCode();
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assertTrue("HTTP return code", statusCode == HTTP_OK);
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}
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@Test
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public void configureHttpClient() throws NoSuchAlgorithmException, URISyntaxException, IOException, InterruptedException{
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CookieManager cManager = new CookieManager();
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cManager.setCookiePolicy(CookiePolicy.ACCEPT_ORIGINAL_SERVER);
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SSLParameters sslParam = new SSLParameters (new String[] { "TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256" }, new String[] { "TLSv1.2" });
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HttpClient.Builder hcBuilder = HttpClient.create();
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hcBuilder.cookieManager(cManager).sslContext(SSLContext.getDefault()).sslParameters(sslParam);
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HttpClient httpClient = hcBuilder.build();
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HttpRequest.Builder reqBuilder = httpClient.request(new URI("https://www.facebook.com"));
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HttpRequest request = reqBuilder.followRedirects(HttpClient.Redirect.ALWAYS).GET();
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HttpResponse response = request.response();
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int statusCode = response.statusCode();
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assertTrue("HTTP return code", statusCode == HTTP_OK);
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}
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SSLParameters getDefaultSSLParameters() throws NoSuchAlgorithmException{
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SSLParameters sslP1 = SSLContext.getDefault().getSupportedSSLParameters();
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String [] proto = sslP1.getApplicationProtocols();
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String [] cifers = sslP1.getCipherSuites();
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System.out.println(printStringArr(proto));
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System.out.println(printStringArr(cifers));
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return sslP1;
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}
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String printStringArr(String ... args ){
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if(args == null){
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return null;
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}
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StringBuilder sb = new StringBuilder();
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for (String s : args){
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sb.append(s);
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sb.append("\n");
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}
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return sb.toString();
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}
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String printHeaders(HttpHeaders h){
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if(h == null){
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return null;
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}
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StringBuilder sb = new StringBuilder();
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Map<String, List<String>> hMap = h.map();
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for(String k : hMap.keySet()){
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sb.append(k).append(":");
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List<String> l = hMap.get(k);
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if( l != null ){
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l.forEach( s -> { sb.append(s).append(","); } );
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}
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sb.append("\n");
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}
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return sb.toString();
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}
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}
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package com.baeldung.java9.language;
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import org.junit.Test;
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public class DiamondTest {
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static class FooClass<X> {
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FooClass(X x) {
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}
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<Z> FooClass(X x, Z z) {
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}
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}
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@Test
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public void diamondTest() {
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FooClass<Integer> fc = new FooClass<>(1) {
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};
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FooClass<? extends Integer> fc0 = new FooClass<>(1) {
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};
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FooClass<?> fc1 = new FooClass<>(1) {
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};
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FooClass<? super Integer> fc2 = new FooClass<>(1) {
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};
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FooClass<Integer> fc3 = new FooClass<>(1, "") {
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};
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FooClass<? extends Integer> fc4 = new FooClass<>(1, "") {
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};
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FooClass<?> fc5 = new FooClass<>(1, "") {
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};
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FooClass<? super Integer> fc6 = new FooClass<>(1, "") {
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};
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}
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}
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package com.baeldung.java9.language;
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import com.baeldung.java9.language.PrivateInterface;
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import org.junit.Test;
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public class PrivateInterfaceTest {
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@Test
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public void test() {
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PrivateInterface piClass = new PrivateInterface() {
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};
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piClass.check();
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}
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}
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package com.baeldung.java9.language;
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import static org.junit.Assert.assertEquals;
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import org.junit.Test;
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public class TryWithResourcesTest {
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static int closeCount = 0;
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static class MyAutoCloseable implements AutoCloseable{
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final FinalWrapper finalWrapper = new FinalWrapper();
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||||
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public void close() {
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closeCount++;
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||||
}
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static class FinalWrapper {
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public final AutoCloseable finalCloseable = new AutoCloseable() {
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||||
@Override
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||||
public void close() throws Exception {
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||||
closeCount++;
|
||||
}
|
||||
};
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||||
}
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}
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@Test
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public void tryWithResourcesTest() {
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MyAutoCloseable mac = new MyAutoCloseable();
|
||||
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||||
try (mac) {
|
||||
assertEquals("Expected and Actual does not match", 0, closeCount);
|
||||
}
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||||
|
||||
try (mac.finalWrapper.finalCloseable) {
|
||||
assertEquals("Expected and Actual does not match", 1, closeCount);
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||||
} catch (Exception ex) {
|
||||
}
|
||||
|
||||
try (new MyAutoCloseable() { }.finalWrapper.finalCloseable) {
|
||||
assertEquals("Expected and Actual does not match", 2, closeCount);
|
||||
} catch (Exception ex) {
|
||||
}
|
||||
|
||||
try ((closeCount > 0 ? mac : new MyAutoCloseable()).finalWrapper.finalCloseable) {
|
||||
assertEquals("Expected and Actual does not match", 3, closeCount);
|
||||
} catch (Exception ex) {
|
||||
}
|
||||
|
||||
try {
|
||||
throw new CloseableException();
|
||||
} catch (CloseableException ex) {
|
||||
try (ex) {
|
||||
assertEquals("Expected and Actual does not match", 4, closeCount);
|
||||
}
|
||||
}
|
||||
assertEquals("Expected and Actual does not match", 5, closeCount);
|
||||
}
|
||||
|
||||
|
||||
static class CloseableException extends Exception implements AutoCloseable {
|
||||
@Override
|
||||
public void close() {
|
||||
closeCount++;
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
|
||||
|
|
@ -0,0 +1,112 @@
|
|||
package com.baeldung.java9.process;
|
||||
|
||||
import java.io.IOException;
|
||||
import java.security.NoSuchAlgorithmException;
|
||||
import java.security.SecureRandom;
|
||||
import java.time.Duration;
|
||||
import java.time.Instant;
|
||||
import java.util.ArrayList;
|
||||
import java.util.List;
|
||||
import java.util.Optional;
|
||||
import java.util.concurrent.CompletableFuture;
|
||||
import java.util.stream.Stream;
|
||||
|
||||
import org.junit.Before;
|
||||
import org.junit.Test;
|
||||
|
||||
import junit.framework.Assert;
|
||||
|
||||
import static org.junit.Assert.assertEquals;
|
||||
import static org.junit.Assert.assertFalse;
|
||||
import static org.junit.Assert.assertTrue;
|
||||
|
||||
public class ProcessApi {
|
||||
|
||||
|
||||
@Before
|
||||
public void init() {
|
||||
|
||||
}
|
||||
|
||||
@Test
|
||||
public void processInfoExample()throws NoSuchAlgorithmException{
|
||||
ProcessHandle self = ProcessHandle.current();
|
||||
long PID = self.getPid();
|
||||
ProcessHandle.Info procInfo = self.info();
|
||||
Optional<String[]> args = procInfo.arguments();
|
||||
Optional<String> cmd = procInfo.commandLine();
|
||||
Optional<Instant> startTime = procInfo.startInstant();
|
||||
Optional<Duration> cpuUsage = procInfo.totalCpuDuration();
|
||||
|
||||
waistCPU();
|
||||
System.out.println("Args "+ args);
|
||||
System.out.println("Command " +cmd.orElse("EmptyCmd"));
|
||||
System.out.println("Start time: "+ startTime.get().toString());
|
||||
System.out.println(cpuUsage.get().toMillis());
|
||||
|
||||
Stream<ProcessHandle> allProc = ProcessHandle.current().children();
|
||||
allProc.forEach(p -> {
|
||||
System.out.println("Proc "+ p.getPid());
|
||||
});
|
||||
|
||||
}
|
||||
|
||||
@Test
|
||||
public void createAndDestroyProcess() throws IOException, InterruptedException{
|
||||
int numberOfChildProcesses = 5;
|
||||
for(int i=0; i < numberOfChildProcesses; i++){
|
||||
createNewJVM(ServiceMain.class, i).getPid();
|
||||
}
|
||||
|
||||
Stream<ProcessHandle> childProc = ProcessHandle.current().children();
|
||||
assertEquals( childProc.count(), numberOfChildProcesses);
|
||||
|
||||
childProc = ProcessHandle.current().children();
|
||||
childProc.forEach(processHandle -> {
|
||||
assertTrue("Process "+ processHandle.getPid() +" should be alive!", processHandle.isAlive());
|
||||
CompletableFuture<ProcessHandle> onProcExit = processHandle.onExit();
|
||||
onProcExit.thenAccept(procHandle -> {
|
||||
System.out.println("Process with PID "+ procHandle.getPid() + " has stopped");
|
||||
});
|
||||
});
|
||||
|
||||
Thread.sleep(10000);
|
||||
|
||||
childProc = ProcessHandle.current().children();
|
||||
childProc.forEach(procHandle -> {
|
||||
assertTrue("Could not kill process "+procHandle.getPid(), procHandle.destroy());
|
||||
});
|
||||
|
||||
Thread.sleep(5000);
|
||||
|
||||
childProc = ProcessHandle.current().children();
|
||||
childProc.forEach(procHandle -> {
|
||||
assertFalse("Process "+ procHandle.getPid() +" should not be alive!", procHandle.isAlive());
|
||||
});
|
||||
|
||||
}
|
||||
|
||||
private Process createNewJVM(Class mainClass, int number) throws IOException{
|
||||
ArrayList<String> cmdParams = new ArrayList<String>(5);
|
||||
cmdParams.add(ProcessUtils.getJavaCmd().getAbsolutePath());
|
||||
cmdParams.add("-cp");
|
||||
cmdParams.add(ProcessUtils.getClassPath());
|
||||
cmdParams.add(mainClass.getName());
|
||||
cmdParams.add("Service "+ number);
|
||||
ProcessBuilder myService = new ProcessBuilder(cmdParams);
|
||||
myService.inheritIO();
|
||||
return myService.start();
|
||||
}
|
||||
|
||||
private void waistCPU() throws NoSuchAlgorithmException{
|
||||
ArrayList<Integer> randArr = new ArrayList<Integer>(4096);
|
||||
SecureRandom sr = SecureRandom.getInstanceStrong();
|
||||
Duration somecpu = Duration.ofMillis(4200L);
|
||||
Instant end = Instant.now().plus(somecpu);
|
||||
while (Instant.now().isBefore(end)) {
|
||||
//System.out.println(sr.nextInt());
|
||||
randArr.add( sr.nextInt() );
|
||||
}
|
||||
}
|
||||
|
||||
}
|
||||
|
|
@ -0,0 +1,13 @@
|
|||
*.class
|
||||
|
||||
#folders#
|
||||
/target
|
||||
/neoDb*
|
||||
/data
|
||||
/src/main/webapp/WEB-INF/classes
|
||||
*/META-INF/*
|
||||
|
||||
# Packaged files #
|
||||
*.jar
|
||||
*.war
|
||||
*.ear
|
||||
Loading…
Reference in New Issue