Postgres: role “postgres” does not exist
Fix FATAL: role “postgres” does not exist with Postgres.app on MacOs
Java
Fix the GradleWorkerMain OutOfMemoryException
Setting the memory size in Gradle to prevent OutOfMemoryExceptions
AWS Elastic Beanstalk Environment Properties not passed for Tomcat
Deploying apps to Elastic Beanstalk can bring surprises when using newer Tomcat versions
Spring Data JPA: Query result directly into DTO
One of the hidden gems of Spring Data JPA is the possibility to put your query results directly into a DTO instead of having it transformed by a mapper
Java Persistence API: Creating a base entity
How to create a JPA base entity without mapping it onto a separate table
Java: Default Spring Boot/Data JPA naming strategy
Default Spring Naming Strategy class and the property key to configure it in Spring Boot.
Java / Maven: Add SNAPSHOT repository to pom
How to configure a Maven repository element to accept SNAPSHOT artifacts (enable snapshots, disable releases).
Java: Benchmark Thymeleaf 2.1.4 vs Thymeleaf 3.0 SNAPSHOT
Benchmark results: Thymeleaf 3.0 snapshot is significantly faster than Thymeleaf 2.1.4 in this test.
Java: Load file from classpath in Spring Boot
How to load files from the classpath in Spring Boot using ResourceLoader (File vs InputStream).
Java: finally will always be executed
Example showing that the finally block runs before the method returns.
Java: download file from URL to temp directory
Java utility to download a remote file to the system temp directory and return its path.
Intellij Idea: Thymeleaf namespace unkown
Add the Thymeleaf namespace (xmlns:th) and DOCTYPE so the IDE recognizes th: attributes.
Java: Spring Boot MVC Controller not called
Why controllers are not discovered and how to configure component scanning (scanBasePackages) in Spring Boot.
Java / Hibernate: Random with Criteria API
Use Restrictions.sqlRestriction(“1=1 order by rand()”) as a simple workaround for random ordering in Criteria.
Java: Include properties files in your Spring config
Examples of configuring Spring to load properties files singly or as a list with overriding behavior.
Java / CDI: Injecting Controller into Controller
Example showing injection of SomeController into BaseController using @Inject in CDI.
Java / Primefaces: Redirection with commandButton
Use p:commandButton with ajax=”false” and action=”targetPage.xhtml?faces-redirect=true” for redirection.
Java: Writing your own listener for a web app
Example of implementing a ServletContextListener and configuring it in web.xml.
Java: Set the Maven path in Intellij Idea
How to locate your Maven installation path and configure it in IntelliJ Idea (Maven home directory).
Java: JSch SSH without known hosts check
Workaround to prevent known_hosts validation errors in JSch: set session.setConfig(“StrictHostKeyChecking”, “no”).
Java: Creating Java classes from DTD file
Use xjc -dtd -d example.dtd to generate Java classes from an XML DTD.
Java: Sending mails with Spring
Spring configuration for JavaMailSenderImpl and a mail utility wrapper for sending plain text emails.
Java: Solve the MojoExecutionException NullPointerException with Swagger
Swagger Maven plugin error occurs when @Api is present but no @ApiOperation; add @ApiOperation to fix.
Linux: Setting the admin password on Glassfish 4
How to change the admin password for Glassfish (asadmin change-admin-password) and for a specific domain.
Installing Glassfish 4 on Ubuntu 12.04 LTS
Step-by-step guide to download, extract, start Glassfish 4 and add an init script for automatic startup.
Installing Oracle Java 7 on Ubuntu 12.04 LTS
Install Oracle Java 7 on Ubuntu 12.04 LTS with the webupd8 PPA and apt-get.