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java.lang.NullPointerException at org.assertj.core.error.ShouldBeEqual.detailedToStringOf(ShouldBeEqual.java:188) at org.assertj.core.error.ShouldBeEqual.detailedActual(ShouldBeEqual.java:193) at org.assertj.core.error.ShouldBeEqual.defaultDetailedErrorMessage(ShouldBeEqual.java:163) at org.assertj.core.error.ShouldBeEqual.newAssertionError(ShouldBeEqual.java:114) at org.assertj.core.internal.Failures.failure(Failures.java:91) at org.assertj.core.internal.Objects.assertEqual(Objects.java:321) at org.assertj.core.api.AbstractAssert.isEqualTo(AbstractAssert.java:213) at SampleTest.testIsEqualTo(SampleTest.java:16)