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gangadkhogangadkho
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Java Custom Exception
1 parent 3cab703 commit a0b0e1c

7 files changed

Lines changed: 120 additions & 7 deletions

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‎core-java/pom.xml‎

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<parent>
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<groupId>com.baeldung</groupId>
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<artifactId>parent-java</artifactId>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../parent-java</relativePath>
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<version>0.0.1-SNAPSHOT</version>
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<relativePath>../parent-java</relativePath>
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</parent>
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<dependencies>
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<artifactId>mail</artifactId>
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<version>${javax.mail.version}</version>
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</dependency>
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<dependency>
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<groupId>javax.mail</groupId>
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<artifactId>mail</artifactId>
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<version>1.5.0-b01</version>
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</dependency>
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</dependencies>
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<build>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-jar-plugin</artifactId>
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<version>${maven-jar-plugin.version}</version>
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<configuration>
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<archive>
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<manifest>
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<plugin>
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<groupId>org.apache.maven.plugins</groupId>
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<artifactId>maven-shade-plugin</artifactId>
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<version>${maven-shade-plugin.version}</version>
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<executions>
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<execution>
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<goals>
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<plugin>
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<groupId>com.jolira</groupId>
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<artifactId>onejar-maven-plugin</artifactId>
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<version>${onejar-maven-plugin.version}</version>
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<executions>
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<execution>
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<configuration>
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<plugin>
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<groupId>org.springframework.boot</groupId>
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<artifactId>spring-boot-maven-plugin</artifactId>
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<version>${spring-boot-maven-plugin.version}</version>
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<executions>
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<execution>
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<goals>
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<maven-javadoc-plugin.version>3.0.0-M1</maven-javadoc-plugin.version>
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<exec-maven-plugin.version>1.6.0</exec-maven-plugin.version>
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<javax.mail.version>1.5.0-b01</javax.mail.version>
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<maven-jar-plugin.version>3.0.2</maven-jar-plugin.version>
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<onejar-maven-plugin.version>1.4.4</onejar-maven-plugin.version>
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<maven-shade-plugin.version>3.1.1</maven-shade-plugin.version>
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<spring-boot-maven-plugin.version>2.0.3.RELEASE</spring-boot-maven-plugin.version>
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</properties>
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</project>

‎core-java/src/main/java/com/baeldung/customexception/FileManager.java‎

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package com.baeldung.customexception;
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import java.io.File;
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import java.io.FileNotFoundException;
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import java.util.Scanner;
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public class FileManager {
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public static String getFirstLine(String fileName) throws IncorrectFileNameException {
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try (Scanner file = new Scanner(new File(fileName))) {
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if (file.hasNextLine()) {
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return file.nextLine();
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} else {
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throw new IllegalArgumentException("Non readable file");
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}
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} catch (FileNotFoundException err) {
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if (!isCorrectFileName(fileName)) {
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throw new IncorrectFileNameException("Incorrect filename : " + fileName, err);
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}
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// Logging etc
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} catch (IllegalArgumentException err) {
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if (!containsExtension(fileName)) {
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throw new IncorrectFileExtensionException("Filename does not contain extension : " + fileName, err);
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}
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// Other error cases and logging
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}
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return "Default First Line";
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}
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private static boolean containsExtension(String fileName) {
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if (fileName.contains(".txt") || fileName.contains(".doc"))
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return true;
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return false;
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}
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private static boolean isCorrectFileName(String fileName) {
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if (fileName.equals("wrongFileName.txt"))
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return false;
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else
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return true;
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}
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}

‎core-java/src/main/java/com/baeldung/customexception/IncorrectFileExtensionException.java‎

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package com.baeldung.customexception;
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public class IncorrectFileExtensionException extends RuntimeException{
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private static final long serialVersionUID = 1L;
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public IncorrectFileExtensionException(String errorMessage, Throwable err) {
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super(errorMessage, err);
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}
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}

‎core-java/src/main/java/com/baeldung/customexception/IncorrectFileNameException.java‎

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package com.baeldung.customexception;
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public class IncorrectFileNameException extends Exception {
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private static final long serialVersionUID = 1L;
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public IncorrectFileNameException(String errorMessage, Throwable err) {
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super(errorMessage, err);
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}
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}

‎core-java/src/test/java/com/baeldung/customexception/IncorrectFileExtensionExceptionUnitTest.java‎

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package com.baeldung.customexception;
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import static org.assertj.core.api.Assertions.assertThat;
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import java.io.File;
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import org.junit.Test;
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public class IncorrectFileExtensionExceptionUnitTest {
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@Test
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public void testWhenCorrectFileExtensionGiven_ReceivesNoException() throws IncorrectFileNameException {
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assertThat(FileManager.getFirstLine("correctFileNameWithProperExtension.txt")).isEqualTo("Default First Line");
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}
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@Test(expected = IncorrectFileExtensionException.class)
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public void testWhenCorrectFileNameExceptionThrown_ReceivesNoException() throws IncorrectFileNameException {
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StringBuffer sBuffer = new StringBuffer();
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sBuffer.append("src");
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sBuffer.append(File.separator);
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sBuffer.append("test");
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sBuffer.append(File.separator);
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sBuffer.append("resources");
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sBuffer.append(File.separator);
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sBuffer.append("correctFileNameWithoutProperExtension");
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FileManager.getFirstLine(sBuffer.toString());
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}
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}

‎core-java/src/test/java/com/baeldung/customexception/IncorrectFileNameExceptionUnitTest.java‎

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package com.baeldung.customexception;
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import static org.assertj.core.api.Assertions.assertThat;
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import org.junit.Test;
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public class IncorrectFileNameExceptionUnitTest {
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@Test(expected = IncorrectFileNameException.class)
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public void testWhenIncorrectFileNameExceptionThrown_ReceivesIncorrectFileNameException() throws IncorrectFileNameException {
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FileManager.getFirstLine("wrongFileName.txt");
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}
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@Test
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public void testWhenCorrectFileNameExceptionThrown_ReceivesNoException() throws IncorrectFileNameException {
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assertThat(FileManager.getFirstLine("correctFileName.txt")).isEqualTo("Default First Line");
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}
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}

‎core-java/src/test/resources/correctFileNameWithoutProperExtension‎

Whitespace-only changes.

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