When Does Java Throw the ExceptionInInitializerError?
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package com.baeldung.exceptionininitializererror;
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import org.junit.Test;
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import java.lang.reflect.Constructor;
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import static org.assertj.core.api.Assertions.assertThatThrownBy;
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public class ExceptionInInitializerErrorUnitTest {
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@Test
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public void givenStaticVar_whenThrows_thenWrapsItInAnExceptionInInitializerError() {
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assertThatThrownBy(StaticVar::new)
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.isInstanceOf(ExceptionInInitializerError.class)
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.hasCauseInstanceOf(RuntimeException.class);
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}
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@Test
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public void givenStaticBlock_whenThrows_thenWrapsItInAnExceptionInInitializerError() {
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assertThatThrownBy(StaticBlock::new)
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.isInstanceOf(ExceptionInInitializerError.class)
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.hasCauseInstanceOf(ArithmeticException.class);
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}
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private static class CheckedConvention {
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private static Constructor<?> constructor;
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static {
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try {
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constructor = CheckedConvention.class.getDeclaredConstructor();
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} catch (NoSuchMethodException e) {
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throw new ExceptionInInitializerError(e);
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}
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}
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}
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private static class StaticVar {
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private static int state = initializeState();
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private static int initializeState() {
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throw new RuntimeException();
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}
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}
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private static class StaticBlock {
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private static int state;
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static {
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state = 42 / 0;
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}
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}
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}
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