Missing method body, or declare abstract in Java
Remove the semicolon on the end of this line: public static void helloWorld();
Java
Web server failed to start. Port 8080 was already in use. Spring Boot microserviceWeb server failed to start. Port 8080 was already in use. Spring Boot microservice
If you don’t want the embedded server to start, just set the following property in you application.properties (or .yml): If your classpath contains the necessary bits to start a web server, Spring Boot will automatically start it. To disable this behaviour configure the WebApplicationType in your application.properties Source: https://docs.spring.io/spring-boot/docs/current/reference/html/howto-embedded-web-servers.html If you application really is a Web application, then you can easily … Read more
How to sort an array of objects in Java?
You have two ways to do that, both use the Arrays utility class Implement a Comparator and pass your array along with the comparator to the sort method which take it as second parameter. Implement the Comparable interface in the class your objects are from and pass your array to the sort method which takes only one parameter. Example Output
Android – SPAN_EXCLUSIVE_EXCLUSIVE spans cannot have a zero length
I have run into the same error entries in LogCat. In my case it’s caused by the 3rd party keyboard I am using. When I change it back to Android keyboard, the error entry does not show up any more.
Determining Day of the week using Zeller’s Congruence in Java
You might want % 100 there. Also, you’re mixing two of the formulae. If you’re after the best implementation in software (as provided by Wikipedia), try this: or this: You were (likely inadvertently) using the start of the second software formula with the end of the first one, causing the computer no end of confusion.
Eclipse No tests found using JUnit 5 caused by NoClassDefFoundError for LauncherFactory
You ran into Eclipse bug 525948 which has already been fixed and which will be published in the upcoming release Oxygen.3 (4.7.3), March 21, 2018. As workaround, put your test code in a separate project and add the project under test to the modulepath, but do not add a module-info.java to your test project. With your project, class and module naming, … Read more
intellij incorrectly saying no beans of type found for autowired repository
I had this same issue when creating a Spring Boot application using their @SpringBootApplication annotation. This annotation represents @Configuration, @EnableAutoConfiguration and @ComponentScan according to the spring reference. As expected, the new annotation worked properly and my application ran smoothly but, Intellij kept complaining about unfulfilled @Autowire dependencies. As soon as I changed back to using @Configuration, @EnableAutoConfiguration and @ComponentScan separately, the errors ceased. It seems Intellij 14.0.3 (and most likely, earlier versions too) is not yet … Read more
Error: JAVA_HOME is not defined correctly executing maven
Assuming you use bash shell and installed Java with the Oracle installer, you could add the following to your .bash_profile This would pick the correct JAVA_HOME as defined by the Oracle installer and will set it first in your $PATH making sure it is found. Also, you don’t need to change it later when updating Java. EDIT As per the … Read more
How do I parse command line arguments in Java?
Check these out: http://commons.apache.org/cli/ http://www.martiansoftware.com/jsap/ Or roll your own: http://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html For instance, this is how you use commons-cli to parse 2 string arguments: usage from command line:
java.util.zip.ZipException: error in opening zip file
Make sure your jar file is not corrupted. If it’s corrupted or not able to unzip, this error will occur.