diff --git a/core-java/pom.xml b/core-java/pom.xml new file mode 100644 index 0000000000..661e787149 --- /dev/null +++ b/core-java/pom.xml @@ -0,0 +1,492 @@ + + 4.0.0 + core-java + 0.1.0-SNAPSHOT + core-java + jar + + + com.baeldung + parent-java + 0.0.1-SNAPSHOT + ../parent-java + + + + + + commons-io + commons-io + ${commons-io.version} + + + org.apache.commons + commons-lang3 + ${commons-lang3.version} + + + org.unix4j + unix4j-command + ${unix4j.version} + + + com.googlecode.grep4j + grep4j + ${grep4j.version} + + + + + com.fasterxml.jackson.core + jackson-databind + ${jackson.version} + + + com.google.code.gson + gson + ${gson.version} + + + + log4j + log4j + ${log4j.version} + + + org.slf4j + log4j-over-slf4j + ${org.slf4j.version} + + + org.projectlombok + lombok + ${lombok.version} + provided + + + + org.assertj + assertj-core + ${assertj-core.version} + test + + + org.javamoney + moneta + ${javamoney.moneta.version} + + + org.owasp.esapi + esapi + ${esapi.version} + + + com.sun.messaging.mq + fscontext + ${fscontext.version} + + + com.codepoetics + protonpack + ${protonpack.version} + + + one.util + streamex + ${streamex.version} + + + io.vavr + vavr + ${vavr.version} + + + org.openjdk.jmh + jmh-core + ${jmh-core.version} + + + org.openjdk.jmh + jmh-generator-annprocess + ${jmh-generator-annprocess.version} + + + com.h2database + h2 + ${h2database.version} + + + + org.javassist + javassist + ${javaassist.version} + + + com.sun + tools + ${sun.tools.version} + system + ${java.home}/../lib/tools.jar + + + + + core-java + + + src/main/resources + true + + + + + + org.apache.maven.plugins + maven-dependency-plugin + + + copy-dependencies + prepare-package + + copy-dependencies + + + ${project.build.directory}/libs + + + + + + + org.apache.maven.plugins + maven-jar-plugin + ${maven-jar-plugin.version} + + + + true + libs/ + org.baeldung.executable.ExecutableMavenJar + + + + + + + org.apache.maven.plugins + maven-assembly-plugin + + + package + + single + + + ${project.basedir} + + + org.baeldung.executable.ExecutableMavenJar + + + + jar-with-dependencies + + + + + + + + org.apache.maven.plugins + maven-shade-plugin + ${maven-shade-plugin.version} + + + + shade + + + true + + + org.baeldung.executable.ExecutableMavenJar + + + + + + + + + com.jolira + onejar-maven-plugin + ${onejar-maven-plugin.version} + + + + org.baeldung.executable.ExecutableMavenJar + true + ${project.build.finalName}-onejar.${project.packaging} + + + one-jar + + + + + + + org.springframework.boot + spring-boot-maven-plugin + ${spring-boot-maven-plugin.version} + + + + repackage + + + spring-boot + org.baeldung.executable.ExecutableMavenJar + + + + + + + org.codehaus.mojo + exec-maven-plugin + ${exec-maven-plugin.version} + + java + com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed + + -Xmx300m + -XX:+UseParallelGC + -classpath + + com.baeldung.outofmemoryerror.OutOfMemoryGCLimitExceed + + + + + + org.apache.maven.plugins + maven-javadoc-plugin + ${maven-javadoc-plugin.version} + + 1.8 + 1.8 + + + + + + + + integration + + + + org.apache.maven.plugins + maven-surefire-plugin + + + integration-test + + test + + + + **/*ManualTest.java + + + **/*IntegrationTest.java + **/*IntTest.java + + + + + + + json + + + + + org.codehaus.mojo + exec-maven-plugin + ${exec-maven-plugin.version} + + + run-benchmarks + + none + + exec + + + test + java + + -classpath + + org.openjdk.jmh.Main + .* + + + + + + + + + + + + buildAgentLoader + + + + org.apache.maven.plugins + maven-jar-plugin + + + package + + jar + + + agentLoader + target/classes + + + true + + ${project.build.outputDirectory}/META-INF/MANIFEST.MF + + + + com/baeldung/instrumentation/application/AgentLoader.class + com/baeldung/instrumentation/application/Launcher.class + + + + + + + + + + buildApplication + + + + org.apache.maven.plugins + maven-jar-plugin + + + package + + jar + + + application + target/classes + + + true + + ${project.build.outputDirectory}/META-INF/MANIFEST.MF + + + + com/baeldung/instrumentation/application/MyAtm.class + com/baeldung/instrumentation/application/MyAtmApplication.class + com/baeldung/instrumentation/application/Launcher.class + + + + + + + + + + buildAgent + + + + org.apache.maven.plugins + maven-jar-plugin + + + package + + jar + + + agent + target/classes + + + true + + ${project.build.outputDirectory}/META-INF/MANIFEST.MF + + + + com/baeldung/instrumentation/agent/AtmTransformer.class + com/baeldung/instrumentation/agent/MyInstrumentationAgent.class + + + + + + + + + + + + + + 2.8.2 + + + 3.9 + 2.5 + 3.6.1 + 1.0.3 + 0.4 + 1.8.7 + 4.6-b01 + 1.13 + 0.6.5 + 0.9.0 + + + 3.10.0 + + + 2.21.0 + + 1.1 + 1.4.197 + 2.1.0.1 + 1.19 + + 1.19 + 3.0.0-M1 + 3.0.2 + 1.4.4 + 3.1.1 + 2.0.3.RELEASE + 1.6.0 + 61.1 + + 3.21.0-GA + + 1.8.0 + + diff --git a/core-java/src/main/java/com/baeldung/exceptions/RootCauseFinder.java b/core-java/src/main/java/com/baeldung/exceptions/RootCauseFinder.java new file mode 100644 index 0000000000..064ae27ac1 --- /dev/null +++ b/core-java/src/main/java/com/baeldung/exceptions/RootCauseFinder.java @@ -0,0 +1,98 @@ +package com.baeldung.exceptions; + +import java.time.LocalDate; +import java.time.Period; +import java.time.format.DateTimeParseException; +import java.util.Objects; + +/** + * Utility class to find root cause exceptions. + */ +public class RootCauseFinder { + + private RootCauseFinder() { + } + + public static Throwable findCauseUsingPlainJava(Throwable throwable) { + Objects.requireNonNull(throwable); + Throwable rootCause = throwable; + while (rootCause.getCause() != null && rootCause.getCause() != rootCause) { + rootCause = rootCause.getCause(); + } + return rootCause; + } + + /** + * Calculates the age of a person from a given date. + */ + static class AgeCalculator { + + private AgeCalculator() { + } + + public static int calculateAge(String birthDate) throws CalculationException { + if (birthDate == null || birthDate.isEmpty()) { + throw new IllegalArgumentException(); + } + + try { + return Period + .between(parseDate(birthDate), LocalDate.now()) + .getYears(); + } catch (DateParseException ex) { + throw new CalculationException(ex); + } + } + + private static LocalDate parseDate(String birthDateAsString) throws DateParseException { + + LocalDate birthDate; + try { + birthDate = LocalDate.parse(birthDateAsString); + } catch (DateTimeParseException ex) { + throw new InvalidFormatException(birthDateAsString, ex); + } + + if (birthDate.isAfter(LocalDate.now())) { + throw new DateOutOfRangeException(birthDateAsString); + } + + return birthDate; + } + + } + + static class CalculationException extends Exception { + + CalculationException(DateParseException ex) { + super(ex); + } + } + + static class DateParseException extends Exception { + + DateParseException(String input) { + super(input); + } + + DateParseException(String input, Throwable thr) { + super(input, thr); + } + } + + static class InvalidFormatException extends DateParseException { + + InvalidFormatException(String input, Throwable thr) { + super("Invalid date format: " + input, thr); + } + } + + static class DateOutOfRangeException extends DateParseException { + + DateOutOfRangeException(String date) { + super("Date out of range: " + date); + } + + } + +} diff --git a/core-java/src/test/java/com/baeldung/exceptions/RootCauseFinderUnitTest.java b/core-java/src/test/java/com/baeldung/exceptions/RootCauseFinderUnitTest.java new file mode 100644 index 0000000000..5d0f3b9c3e --- /dev/null +++ b/core-java/src/test/java/com/baeldung/exceptions/RootCauseFinderUnitTest.java @@ -0,0 +1,114 @@ +package com.baeldung.exceptions; + +import com.google.common.base.Throwables; +import org.apache.commons.lang3.exception.ExceptionUtils; +import org.junit.jupiter.api.Assertions; +import org.junit.jupiter.api.Test; + +import java.time.LocalDate; +import java.time.format.DateTimeParseException; +import java.time.temporal.ChronoUnit; + +import static com.baeldung.exceptions.RootCauseFinder.*; +import static org.junit.jupiter.api.Assertions.assertTrue; + +/** + * Tests the {@link RootCauseFinder}. + */ +public class RootCauseFinderUnitTest { + + @Test + public void givenBirthDate_whenCalculatingAge_thenAgeReturned() { + try { + int age = AgeCalculator.calculateAge("1990-01-01"); + Assertions.assertEquals(1990, LocalDate + .now() + .minus(age, ChronoUnit.YEARS) + .getYear()); + } catch (CalculationException e) { + Assertions.fail(e.getMessage()); + } + } + + @Test + public void givenWrongFormatDate_whenFindingRootCauseUsingJava_thenRootCauseFound() { + try { + AgeCalculator.calculateAge("010102"); + } catch (CalculationException ex) { + assertTrue(findCauseUsingPlainJava(ex) instanceof DateTimeParseException); + } + } + + @Test + public void givenOutOfRangeDate_whenFindingRootCauseUsingJava_thenRootCauseFound() { + try { + AgeCalculator.calculateAge("2020-04-04"); + } catch (CalculationException ex) { + assertTrue(findCauseUsingPlainJava(ex) instanceof DateOutOfRangeException); + } + } + + @Test + public void givenNullDate_whenFindingRootCauseUsingJava_thenRootCauseFound() { + try { + AgeCalculator.calculateAge(null); + } catch (Exception ex) { + assertTrue(findCauseUsingPlainJava(ex) instanceof IllegalArgumentException); + } + } + + @Test + public void givenWrongFormatDate_whenFindingRootCauseUsingApacheCommons_thenRootCauseFound() { + try { + AgeCalculator.calculateAge("010102"); + } catch (CalculationException ex) { + assertTrue(ExceptionUtils.getRootCause(ex) instanceof DateTimeParseException); + } + } + + @Test + public void givenOutOfRangeDate_whenFindingRootCauseUsingApacheCommons_thenRootCauseFound() { + try { + AgeCalculator.calculateAge("2020-04-04"); + } catch (CalculationException ex) { + assertTrue(ExceptionUtils.getRootCause(ex) instanceof DateOutOfRangeException); + } + } + + @Test + public void givenNullDate_whenFindingRootCauseUsingApacheCommons_thenRootCauseNotFound() { + try { + AgeCalculator.calculateAge(null); + } catch (Exception ex) { + assertTrue(ExceptionUtils.getRootCause(ex) instanceof IllegalArgumentException); + } + } + + @Test + public void givenWrongFormatDate_whenFindingRootCauseUsingGuava_thenRootCauseFound() { + try { + AgeCalculator.calculateAge("010102"); + } catch (CalculationException ex) { + assertTrue(Throwables.getRootCause(ex) instanceof DateTimeParseException); + } + } + + @Test + public void givenOutOfRangeDate_whenFindingRootCauseUsingGuava_thenRootCauseFound() { + try { + AgeCalculator.calculateAge("2020-04-04"); + } catch (CalculationException ex) { + assertTrue(Throwables.getRootCause(ex) instanceof DateOutOfRangeException); + } + } + + @Test + public void givenNullDate_whenFindingRootCauseUsingGuava_thenRootCauseFound() { + try { + AgeCalculator.calculateAge(null); + } catch (Exception ex) { + assertTrue(Throwables.getRootCause(ex) instanceof IllegalArgumentException); + } + } + +}