Github Actions provide the ability to define a build workflow directly in Github. The workflow steps are defined as yaml and can be triggered by various events, including a code push, branch, or tagging in the repository. In this article I will detail the steps of creating a simple Spring Boot web application that when … Github: automated Github release for Spring Boot jar using Github Actions
The GitHub “Release” page for a repository can provide your consumers a convenient way to download a binary version of your software as well as track the latest changes and enhancements. In this article, I will show how to invoke a local release process for a Java Spring Boot jar built with Gradle. A new … Github: locally invoked release process for a Gradle built Java Spring Boot project
If you need to enable JDWP debugging of your Spring Boot web application in an IDE such as Eclipse, you can append the ‘debug-jvm’ flag to the gradle task, and then from your IDE enable a remote debugging connection to port 5005. I will walk you through a full example, but very quickly, here is … Gradle: interactive JDWP debugging of bootRun gradle task in Eclipse IDE
The Spring Security framework provides a robust and customizable framework for authentication and authorization for Spring based applications. Using Spring Security, a Spring developer can add OIDC authentication and OAuth2 protection of resources by including the libraries in the build, configuring the Spring application.yml, and enabling various component configurations and annotations. In this article, I … Java: Spring Security OAuth2/OIDC protecting Client App and Resource Server
The “cf app” command will provide a brief expansion of a buildpack’s settings, but does not provide an exact buildpack name. Luckily, this can easily be pulled using “cf curl” and the CloudFoundry API. Assuming you have the jq utility for parsing/querying json output: # set name of cloudfoundry app app=”my-cf-app” # using name, pull … CloudFoundry: Determining buildpack used by application
There are many Linux based ftp clients, but if you run into connectivity issues when using the HTTP CONNECT method through a proxy such as Squid, you may need to leverage more control by writing your interactions using a library such as ftp4j. In this article, I’ll provide a Java project with sample code that … Java: FTP with an HTTP proxy using the CONNECT method
If you need to manipulate a Java archive such as a jar or war, and do not have access to the jar utility (it only comes packaged with the JDK, not JRE), you can always use the standard GNU zip/unzip utilities.
Although in modern architectures you typically see Spring Boot executable jars running as the primary process of a container, there are still many deployment scenarios where running the jar as a service at boot time is required. With Ubuntu 14.04, we can use SysV to run a Spring Boot application at boot time. This will … Java: Spring Boot application as a service using SysV on Ubuntu 14.04
Although in modern architectures you typically see Spring Boot executable jars running as the primary process of a container, there are still many deployment scenarios where running the jar as a service at boot time is required. With Ubuntu 16.04, we can use the built-in systemd supervisor to run a Spring Boot application at boot … Java: Spring Boot application as a service using systemd on Ubuntu 16.04
The two most common logging implementations used in conjunction with Spring/Spring Boot are Logback and Log4j2. In the recent past, a developer had a great deal of discretion on the format and files used for logging. But in the modern world of container deployment and scale, these logs typically feed enterprise logging solutions which requires … Java: Collapsing multiline stack traces into a single log event using Spring backed by Logback or Log4j2
There are numerous articles I’ve written where a certificate is a prerequisite for deploying a piece of infrastructure. This article will guide you through creating a trusted CA (Certificate Authority), and then using that to sign a server certificate that supports SAN (Subject Alternative Name). Operationally, having your own trusted CA is advantageous over a … Ubuntu: Creating a trusted CA and SAN certificate using OpenSSL
If a Java class file is compiled with a higher supported version than is currently being run, you will get the ‘bad class file’, ‘class file has the wrong version XX.0, should be XX.0’ error message. For example, if the .class file was compiled as a Java 1.8 class file on a Jenkins continuous integration … Java: Determining the Java version used to compile a class, ‘class file has the wrong version’
Remote debugging of Java applications from an IDE can be essential when debugging difficult issues. There is no reason to give this functionality up just because you are deploying to a container in Cloud Foundry. In this article we’ll go over how to enable remote debugging from a local Eclipse IDE to a public CF … CloudFoundry: Enabling Java remote debugging with Eclipse
The Spring framework provides a proven and well documented model for the development of custom projects and services. The Spring Boot project takes an opinionated view of building production Spring applications, which favors convention over configuration. In this article we will explore how to configure a Spring Boot project to use the Simple Logging Facade … Spring: Spring Boot with SLF4J/Logback sending to syslog
Once you have a Squid proxy setup as described in my article here, the next challenge is configuring your Ubuntu servers so that they use this proxy by default instead of attempting direct internet connections. There are several entities we want using Squid by default: apt package manager, interactive consoles and wget/curl, and Java applications.
Java JMX (Java Management Extensions) is a standardized way of monitoring Java based applications. The managed resources (MBeans) are defined and exposed by the JVM, application server, and application – and offer a view into these layers that can provide invaluable monitoring data. But in order to report back the JMX data you must know … Monitoring: Java JMX exploration from the console using jmxterm
As an exploration of AppDynamics’ APM functionality, you may find it useful to deploy a sample application that can quickly return back useful data. The Java Spring PetClinic connecting back to a PostgreSQL database provides a simple code base that exercises both database and application monitoring. In a previous article, I went over the detailed … AppDynamics: Java Spring PetClinic and PostgreSQL configured for monitoring
As an exploration of AppDynamics’ APM functionality, you may find it useful to deploy a sample application that can quickly return back useful data. The Java Spring PetClinic connecting back to a MySQL database provides a simple code base that exercises both database and application monitoring. We’ll deploy the Java Spring PetClinic unto Tomcat running … AppDynamics: Java Spring PetClinic and MySQL configured for monitoring
Decompiling Java classes is sometimes associated with dubious behavior around proprietary and licensed software, but in reality there are many valid reasons why one may find it necessary to dig into Java class files and jar/war archives. It may be as simple as your development team no longer having the 5 year old version of … Ubuntu: Decompiling Java classes on Ubuntu using Eclipse and JD-GUI
SLF4J, the Simple Logging Facade for Java, is a popular front for various logging backends, one of the being Logback. With the advent of containerization, using syslog to send data to remote logging infrastructure has become a popular transport method. Enable Syslog Input The first step is to enable the receipt of syslog messages. This … Syslog: Sending Java SLF4J/Logback to Syslog
Logging has always been a critical part of application development. But the rise of OS virtualization, applications containers, and cloud-scale logging solutions has turned logging into something bigger that managing local debug files. Modern applications and services are now expected to feed log aggregation and analysis stacks (ELK, Graylog, Loggly, Splunk, etc). This can be … Syslog: Sending Java log4j2 to rsyslog on Ubuntu
In the world of microservices and containers, it is often desirable to keep settings such as those found in dfc.properties outside of the jar or war so that the deployment binary is the same no matter which environment it is deployed into. The settings in dfc.properties can be externalized by specifying the location of dfc.properties … Documentum: Separating dfc.properties from your WAR