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bhaskar16Bhaskar-Dastidar-E3295
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[BAEL-6955] finalization deprcation (#14932)
Co-authored-by: Bhaskar <bhaskar.dastidar@freshworks.com>
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‎core-java-modules/core-java-18/README.md‎

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‎core-java-modules/core-java-18/pom.xml‎

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<?xml version="1.0" encoding="UTF-8"?>
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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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<artifactId>core-java-18</artifactId>
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<name>core-java-18</name>
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<packaging>jar</packaging>
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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-modules</artifactId>
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<version>1.0.0-SNAPSHOT</version>
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<relativePath>../../</relativePath>
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</parent>
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<build>
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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>${maven-compiler-plugin.version}</version>
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<configuration>
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<release>${maven.compiler.release}</release>
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<compilerArgs>--enable-preview</compilerArgs>
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<source>${maven.compiler.source.version}</source>
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<target>${maven.compiler.target.version}</target>
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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>${surefire.plugin.version}</version>
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<configuration>
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<forkCount>1</forkCount>
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</configuration>
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<dependencies>
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<dependency>
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<groupId>org.apache.maven.surefire</groupId>
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<artifactId>surefire-api</artifactId>
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<version>${surefire.plugin.version}</version>
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</dependency>
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</dependencies>
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</plugin>
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</plugins>
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</build>
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<properties>
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<maven.compiler.source.version>18</maven.compiler.source.version>
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<maven.compiler.target.version>18</maven.compiler.target.version>
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<maven.compiler.release>18</maven.compiler.release>
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<surefire.plugin.version>3.0.0-M5</surefire.plugin.version>
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</properties>
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</project>

‎core-java-modules/core-java-18/src/main/java/com/baeldung/finalization_closeable_cleaner/FinalizationExamples.java‎

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package com.baeldung.finalization_closeable_cleaner;
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import java.io.FileInputStream;
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import java.io.IOException;
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public class FinalizationExamples {
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FileInputStream fis = null;
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public void readFileOperationWithFinalization() throws IOException {
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try {
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fis = new FileInputStream("input.txt");
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// perform operation on the file
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System.out.println(fis.readAllBytes().length);
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} finally {
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if (fis != null)
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fis.close();
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}
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}
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public void readFileOperationWithTryWith() throws IOException {
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try (FileInputStream fis = new FileInputStream("input.txt")) {
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// perform operations
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System.out.println(fis.readAllBytes().length);
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}
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}
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}

‎core-java-modules/core-java-18/src/main/java/com/baeldung/finalization_closeable_cleaner/MyCleanerResourceClass.java‎

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package com.baeldung.finalization_closeable_cleaner;
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import java.lang.ref.Cleaner;
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public class MyCleanerResourceClass implements AutoCloseable {
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private static Resource resource;
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private static final Cleaner cleaner = Cleaner.create();
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private final Cleaner.Cleanable cleanable;
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public MyCleanerResourceClass() {
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resource = new Resource();
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this.cleanable = cleaner.register(this, new CleaningState());
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}
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public void useResource() {
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// using the resource here
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resource.use();
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}
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@Override
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public void close() {
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// perform actions to close all underlying resources
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this.cleanable.clean();
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}
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static class CleaningState implements Runnable {
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CleaningState() {
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// constructor
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}
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@Override
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public void run() {
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// some cleanup action
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System.out.println("Cleanup done");
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}
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}
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static class Resource {
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void use() {
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System.out.println("Using the resource");
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}
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void close() {
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System.out.println("Cleanup done");
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}
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}
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}

‎core-java-modules/core-java-18/src/main/java/com/baeldung/finalization_closeable_cleaner/MyCloseableResourceClass.java‎

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package com.baeldung.finalization_closeable_cleaner;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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public class MyCloseableResourceClass implements AutoCloseable {
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private final FileInputStream fis;
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public MyCloseableResourceClass() throws FileNotFoundException {
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this.fis = new FileInputStream("src/main/resources/file.txt");
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}
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public int getByteLength() throws IOException {
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System.out.println("Some operation");
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return this.fis.readAllBytes().length;
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}
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@Override
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public void close() throws IOException {
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System.out.println("Finalized object");
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this.fis.close();
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}
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}

‎core-java-modules/core-java-18/src/main/java/com/baeldung/finalization_closeable_cleaner/MyFinalizableResourceClass.java‎

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package com.baeldung.finalization_closeable_cleaner;
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import java.io.FileInputStream;
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import java.io.FileNotFoundException;
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import java.io.IOException;
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public class MyFinalizableResourceClass {
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private FileInputStream fis;
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public MyFinalizableResourceClass() throws FileNotFoundException {
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this.fis = new FileInputStream("src/main/resources/file.txt");
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}
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public int getByteLength() throws IOException {
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System.out.println("Some operation");
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return this.fis.readAllBytes().length;
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}
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@Override
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protected void finalize() throws Throwable {
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System.out.println("Finalized object");
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this.fis.close();
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}
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}

‎core-java-modules/core-java-18/src/main/resources/file.txt‎

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This is a test file.

‎core-java-modules/core-java-18/src/test/java/com/baeldung/finalization_closeable_cleaner/FinalizationCloseableCleanerUnitTest.java‎

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package com.baeldung.finalization_closeable_cleaner;
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import static org.junit.jupiter.api.Assertions.assertDoesNotThrow;
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import java.io.IOException;
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import org.junit.Assert;
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import org.junit.Test;
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public class FinalizationCloseableCleanerUnitTest {
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@Test
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public void givenMyFinalizationResource_whenUsingFinalize_thenShouldClean() {
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assertDoesNotThrow(() -> {
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MyFinalizableResourceClass mfr = new MyFinalizableResourceClass();
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mfr.getByteLength();
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});
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}
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@Test
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public void givenMyCleanerResource_whenUsingCleanerAPI_thenShouldClean() {
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assertDoesNotThrow(() -> {
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try (MyCleanerResourceClass myCleanerResourceClass = new MyCleanerResourceClass()) {
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myCleanerResourceClass.useResource();
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}
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});
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}
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@Test
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public void givenCloseableResource_whenUsingTryWith_thenShouldClose() throws IOException {
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int length = 0;
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try (MyCloseableResourceClass mcr = new MyCloseableResourceClass()) {
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length = mcr.getByteLength();
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}
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Assert.assertEquals(20, length);
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}
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}

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