java

print spaces with String.format()

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You need to specify the minimum width of the field. String.format(“%” + numberOfSpaces + “s”, “”); Why do you want to generate a String of spaces of a certain length. If you want a column of this length with values then you can do: String.format(“%” + numberOfSpaces + “s”, “Hello”); which gives you numberOfSpaces-5 spaces … Read more

Spring boot test “No qualifying bean of type available”

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The test environment needs to know where your beans are defined, so you have to tell it the location. In your test class, add the @ContextConfiguration annotation: @RunWith(SpringRunner.class) @AutoConfigureTestDatabase(replace = Replace.NONE) @DataJpaTest @ContextConfiguration(classes = {YourBeans.class, MoreOfYourBeans.class}) public class UserRepoTest { @Autowired private UserRepo userRepo = null; @Autowired private TestEntityManager entityManager = null;

How to add Log4J2 appenders at runtime programmatically?

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There have been a number of requests to support better programmatic configuration for Log4j 2. Sorry it took so long. As of Log4j 2.4, API was added to log4j-core to facilitate programmatic configuration. The new ConfigurationBuilder API allows users to construct component definitions. With this API, there is no need to work directly with actual … Read more

How to get the size of a Stream after applying a filter by lambda expression?

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When you get a stream from the list, it doesn’t modify the list. If you want to get the size of the stream after the filtering, you call count() on it. long sizeAfterFilter = locales.stream().filter(l -> l.getLanguage().equals(“en”)).count(); If you want to get a new list, just call .collect(toList()) on the resulting stream. If you are … Read more

Why has javax.persistence-api been replaced by jakarta.persistence-api in spring data jpa starter?

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From Java Persistence API on Wikipedia: The Java Persistence API (JPA), in 2019 renamed to Jakarta Persistence, is a Java application programming interface specification that describes the management of relational data in applications using Java Platform, Standard Edition and Java Platform, Enterprise Edition/Jakarta EE. After Java EE was open sourced by Oracle and gave the … Read more