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Java

Common directory for JDKs installed with DNF​

/usr/lib/jvm

Mockito​

tip

When using @InjectMocks objects mocked with @Mock need to have EXACTLY the same type in both the original and tests classes (not a subclass/superclass).

Spring​

Common static imports used in tests​

import static org.assertj.core.api.Assertions.*;
import static org.hamcrest.Matchers.*;
import static org.junit.jupiter.api.Assertions.*;
import static org.mockito.ArgumentMatchers.*;
import static org.mockito.BDDMockito.*;
import static org.mockito.Mockito.*;
import static org.springframework.test.web.servlet.request.MockMvcRequestBuilders.*;
import static org.springframework.test.web.servlet.result.MockMvcResultMatchers.*;

Default variable values can also be set in .properties files​

For example to default to the blank String when the environment variable is missing:

some.property=${SOME_VARIABLE:}

Useful cron expressions that can be used with @Scheduled​

Every second

* * * * * *

Every minute

0 0/1 * 1/1 * ?

String​

Comparisons (equals vs. ==)​

Generally .equals() needs to be used, so the contents are compared. If the argument is null it returns false.

With == whether both operands refer to the same object is checked.