A Gradle Exec task will only run the last ‘commandLine’ defined inside its block. Putting multiple entries inside its block will not run multiple commands. As an example, if you run the following Gradle task. task willOnlyRunLast(type: Exec) { commandLine “echo”, “first” commandLine “echo”, “second” commandLine “echo”, “last” } The task above will only echo … Gradle: running more than one command in an Exec task
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
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 build and publish of containerized Spring Boot app 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
If the gradle wrapper for your project is broken, you can reinstall it with the “gradle wrapper” command. For example, below is a common error if you have cloned a git repository where the owner has not pushed all the necessary gradle components into the repo. $ ./gradlew –info Error: Could not find or load … Gradle: fixing the gradle wrapper for a Java project
While working on your Spring Boot web application locally, gradle provides the ‘bootRun’ for a quick development lifecycle and ‘bootJar’ for packaging all the dependencies as a single jar deliverable. But for most applications these days, you will need this packaged into an OCI compatible (i.e. Docker) image for its ultimate deployment to an orchestrator … Java: build OCI compatible image for Spring Boot web app using jib
Spring Boot excels as a framework that makes it convenient to expose a set of REST based services. But once an application is developed, it is so trivial to create a new resource or modify a method signature that it becomes difficult to keep the documentation up-to-date so that clients can properly consume the REST … Java: Spring Boot REST service with OpenAPI/Swagger documentation
A Kubernetes liveness and readiness probe is how the kubelet determines health of a pod. This is often times as simple as checking the ability to reach the main service port over TCP or HTTP. But if you are using Spring Boot and have enabled the Actuator dependency, you have the ability to create even … Kubernetes: liveness probe for Spring Boot with custom Actuator health check
While working on your Spring Boot web application locally, gradle provides the ‘bootRun’ for a quick development lifecycle and ‘bootJar’ for packaging all the dependencies as a single jar deliverable. But for most applications these days, you will need this packaged into an OCI compatible (i.e. Docker) image for its ultimate deployment to an orchestrator … Java: Creating Docker image for Spring Boot web app using gradle
If you have enabled Actuator in your Spring Boot application, you can add custom status metrics to the standard health check at ‘/actuator/health’. Additionally, your custom health indicator can signal an UP/DOWN status that propagates to the main level status and can then be used by an external monitoring/alerting solutions or as an indicator to … Java: adding custom health indicator to Spring Boot Actuator
If you have enabled Actuator and the ‘micrometer-registry-prometheus’ dependency in your Spring Boot application, then you will have a new ‘/actuator/prometheus’ web endpoint that returns general information about threads, garbage collection, disk, and memory. This information is delivered in standard prometheus formatting as plaintext, with one metric per line. This is exactly the type of … Java: Adding custom metrics to Spring Boot Micrometer Prometheus endpoint
If you have enabled Actuator in your Spring Boot application, then in addition to the standard endpoints for health and metrics, you can also add your own endpoint to expose custom metrics. In its simplest form, this is done by adding a @Component and @Endpoint annotation to a custom class that returns the metrics, and … Java: exposing a custom Actuator endpoint with Spring Boot
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
The recommended way to run a Gradle build is with the Gradle wrapper. You can check the current version of your wrapper with the command: $ ./gradlew –version If you are working with an older Gradle version and want to upgrade to take advantage of new features, you can use the ‘wrapper’ task specifying the … Gradle: Upgrading the Gradle wrapper version
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
The JRE comes preloaded with a set of trusted root authorities, but if you are working with self-signed certificates, or SAN server certificates that were signed using your own Certificate Authority then you are going to need to add these certificates to your trusted keystore. If your Java application attempts to communicate via TLS to … Java: Loading self-signed, CA, and SAN certificates into a Java Keystore
An essential part of the standard build process for Java applications is having a repository where project artifacts are stored. Artifact curation provides the ability to manage dependencies, quickly rollback releases, support compatibility of downstream projects, do QA promotion from test to production, support a continuous build pipeline, and provides auditability. Archiva from the Apache … Maven: Installing a private Maven repository on Ubuntu using Apache Archiva
JAXB provides a framework for two-way binding between XML and Java structures, making it easy for developers to serialize and deserialize their XML into Java objects. Decorating a class with @XmlElement and @XmlAttribute annotations is all it usually takes to build a rich domain model from XML, but sometimes you get into a situation where … Java: Using XMLAdapter to process custom datatypes using JAXB
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’
In this short article, I’ll provide some Maven commands that I’ve found helpful. Run single class from src/main/java mvn exec:java -Dexec.mainClass=this.is.MyClass -Dexec.args=”myarg1 ‘my second arg’ myarg3″ Run unit test from src/test/java, all methods decorated with @Test mvn test -Dtest=this.is.MyTestClass Run unit test from src/test/java, only methods decorated with @Test and that start with ‘testDatabase’ … Java: Using Maven from the console for running classes, unit tests, checking dependencies
Enabling the use of real-time JVM monitoring tools like jconsole and VisualVM can be extremely beneficial when troubleshooting issues. These tools work by enabling a JMX/RMI communication channel to the JVM. These are typically thought of as local development tools, but they can also be used on remote CF containers running Java. In this article, … CloudFoundry: Enabling Java JMX/RMI access for remote containers
Java thread and heap dumps are valuable tools for troubleshooting local development, but they can also be used on remote CF containers running a JVM. In this article, we’ll go through various method of gathering this data from a Cloud Foundry container and then tools for analyzing this data. Now matter how uniform your environments, … CloudFoundry: Java thread and heap dump analysis on remote containers
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
Cloud Foundry is an opinionated Platform-as-a-Service that allows you to manage applications at scale. This article is part of a series that explores different facets of a Cloud Foundry deployment using the spring-music project as an example. This article is Part 5 of a series on Cloud Foundry concepts: Deploying the spring-music webapp, Part 1 Persisting spring-music data … CloudFoundry: Monitoring the spring-music webapp, Part 5
Cloud Foundry is an opinionated Platform-as-a-Service that allows you to manage applications at scale. This article is part of a series that explores different facets of a Cloud Foundry deployment using the spring-music project as an example. This article is Part 4 of a series on Cloud Foundry concepts: Deploying the spring-music webapp, Part 1 Persisting spring-music data … CloudFoundry: Logging for the spring-music webapp, Part 4
Cloud Foundry is an opinionated Platform-as-a-Service that allows you to manage applications at scale. This article is part of a series that explores different facets of a Cloud Foundry deployment using the spring-music project as an example. This article is Part 3 of a series on Cloud Foundry concepts: Deploying the spring-music webapp, Part 1 Persisting … CloudFoundry: Scaling the spring-music webapp, Part 3
Cloud Foundry is an opinionated Platform-as-a-Service that allows you to manage applications at scale. This article is part of a series that explores different facets of a Cloud Foundry deployment using the spring-music project as an example. This article is Part 2 of a series on Cloud Foundry concepts: Deploying the spring-music webapp, Part 1 Persisting … CloudFoundry: Persisting spring-music data using Postgres service, Part 2
Cloud Foundry is an opinionated Platform-as-a-Service that allows you to manage applications at scale. It supports multiple infrastructure platforms, and is able to standardize deployment, logging, scaling, and routing in a way friendly to a continuous delivery pipeline. This article is Part 1 of a series on Cloud Foundry concepts: Deploying the spring-music webapp, Part 1 … CloudFoundry: Deploying the spring-music webapp, Part 1
Building services using Spring Boot gives a development team a jump start on many production concerns, including logging. But unlike a standard deployment where logging to a local file is where the developer’s responsibility typically ends, with Docker we must think about how to log to a public space outside our ephemeral container space. The … Docker: Sending Spring Boot logging to syslog
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
Especially in enterprise application development, there can be 3rd party dependencies that are not available in public Maven repositories. These may be internal, business specific libraries or licensed libraries that have limitations on usage. When this is the case, you can either publish to a private Maven repository that controls authorization or you can put … Maven: Installing a 3rd party jar to a local or remote repository
An essential part of the standard build process for Java applications is having a set of repositories where project artifacts are stored. Artifact curation provides the ability to manage dependencies, quickly rollback releases, support compatibility of downstream projects, do QA promotion from test to production, support a continuous build pipeline, and provides auditability. JFrog puts … Maven: Installing a private Maven repository on Ubuntu using Artifactory
Selenium is an open-source solution for automating the browser allowing you to run continuous integration tests, validate performance and scalability, and perform regression testing of web applications. This kind of automated testing is useful not only from desktop systems, but also from server machines where you may want to monitor availability or correctness of returned … Selenium: Running headless automated tests on Ubuntu
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