Automating the Oracle JDK installation on RHEL derivatives (such as CentOS, Oracle Linux) and Debian derivatives (such as Mint, Ubuntu) differs. This is due to different package managers and repositories. In this blog I’ll provide quick instructions on how to automate the installation of Oracle JDK 8 and 10 on […]
Java
Everthing related to the Java programming language
Oracle Service Bus 12.2.1.1.0: Service Exploring via WebLogic Server MBeans with JMX
In a previous article I talked about an OSBServiceExplorer tool to explore the services (proxy and business) within the OSB via WebLogic Server MBeans with JMX. The code mentioned in that article was based on Oracle Service Bus 11.1.1.7 (11g). In the meantime the OSB world has changed (for example […]
Running Spring Boot in a Docker container on OpenJDK, Oracle JDK, Zulu on Alpine Linux, Oracle Linux, Ubuntu
Spring Boot is great for running inside a Docker container. Spring Boot applications ‘just run’. A Spring Boot application has an embedded servlet engine making it independent of application servers. There is a Spring Boot Maven plugin available to easily create a JAR file which contains all required dependencies. This […]
Application Container Cloud Service (ACCS): Using the Application Cache from a Spring Boot application
Spring Boot allows you to quickly develop microservices. Application Container Cloud Service (ACCS) allows you to easily host Spring Boot applications. Oracle provides an Application Cache based on Coherence which you can use from applications deployed to ACCS. In order to use the Application Cache from Spring Boot, Oracle provides […]
Java: How to fix Spring @Autowired annotation not working issues
Spring is a powerful framework, but it requires some skill to use efficiently. When I started working with Spring a while ago (actually Spring Boot to develop microservices) I encountered some challenges related to dependency injection and using the @Autowired annotation. In this blog I’ll explain the issues and possible […]
Getting started with Spring Boot microservices. Why and how.
In order to quickly develop microservices, Spring Boot is a common choice. Why should I be interested in Spring Boot? In this blog post I’ll give you some reasons why looking at Spring Boot is interesting and give some samples on how to get started quickly. I’ll shortly talk about […]
Handle HTTP PATCH request with Java Servlet
The Java Servlet specification does not include handling a PATCH request. That means that class javax.servlet.http.HttpServlet does not have a doPatch() method, unlike doGet, doPost, doPut etc. That does not mean that a Java Servlet can not handle PATCH requests. It is quite simple to make it do that. The […]
JSON manipulation in Java 9 JShell
In this article I will demonstrate how we can work with JSON based data – for analysis, exploration, cleansing and processing – in JShell, much like we do in Python. I work with a JSON document with entries for all sessions at the Oracle OpenWorld 2017 conference (https://raw.githubusercontent.com/lucasjellema/scrape-oow17/master/oow2017-sessions-catalog.json) The Java […]
Java 9 – First baby steps with Modules and jlink
In a recent article, I created an isolated Docker Container as Java 9 R&D environment: https://technology.amis.nl/2017/10/11/quick-and-clean-start-with-java-9-running-docker-container-in-virtualbox-vm-on-windows-10-courtesy-of-vagrant/. In this article, I will use that environment to take few small steps with Java 9 – in particular with modules. Note:this story does not end well. I wanted to conclude with using jlink […]
Quick and clean start with Java 9–running Docker container in VirtualBox VM on Windows 10 courtesy of Vagrant
The messages from JavaOne 2017 were loud and clear. Some of these: Java 9 is here, the OpenJDK has all previously exclusive commercial features from the Oracle (fka SUN) JDK – this includes the Java Flight Recorder for real time monitoring/metrics gathering and analysis, Java 9 will be succeeded by […]
Smooth, easy, lightweight – Node.js and Express style REST API with Java SE
It is easy to be seduced by some of the attractive qualities of Node (aka Node.js) – the JavaScript technology that makes server side development fun again. Developing light weight applications that handle HTTP requests in a rapid, straightforward way with little overhead and no bloated infrastructure is easy as […]
Oracle Service Bus : Service Exploring via WebLogic Server MBeans with JMX
At a public sector organization in the Netherlands there was the need to make an inventory of the deployed OSB services in order to find out, the dependencies with certain external web services (which were on a list to become deprecated). For this, in particular the endpoints of business services […]
Oracle Service Bus : disable / enable a proxy service via WebLogic Server MBeans with JMX
At a public sector organization in the Netherlands an OSB proxy service was (via JMS) reading messages from a WebLogic queue. These messages where then send to a back-end system. Every evening during a certain time period the back-end system was down. So therefor and also in case of planned […]
Apache Kafka Streams – Running Top-N Aggregation grouped by Dimension – from and to Kafka Topic
This article explains how to implement a streaming analytics application using Kafka Streams that performs a running Top N analysis on a Kafka Topic and produces the results to another Kafka Topic. Visualized, this looks like this: Two previous articles are relevant as reference: Getting Started with Kafka Streams – […]
Getting Started with Kafka Streams – building a streaming analytics Java application against a Kafka Topic
Kafka Streams is a light weight Java library for creating advanced streaming applications on top of Apache Kafka Topics. Kafka Streams provides easy to use constructs that allow quick and almost declarative composition by Java developers of streaming pipelines that do running aggregates, real time filtering, time windows, joining of […]
Download all directly and indirectly required JAR files using Maven install dependency:copy-dependencies
My challenge is simple: I am creating a small Java application – single class with main method – that has many direct and indirect dependencies. In order to run my simple class locally I need to: code the Java Class compile the class run the class In order to compile […]
WebLogic Server: Logging the SOAP action in the access.log
WebLogic Server allows you to customize your access.log. This can be very powerful if you want to monitor for example service response times in a tool like Splunk (see here). When working with SOAP services though, especially those with many operations, it can be insufficient to monitor services to the […]
Doing performance measurements of an OSB Proxy Service by programmatically extracting performance metrics via the ServiceDomainMBean and presenting them as an image via a PowerPoint VBA module
This article explains how the process of doing performance measurements of an OSB Proxy Service and presenting them in a “performance analysis document” was partly automated. After running a SoapUI based Test Step (sending a request to the service), extracting the service performance metrics was done by using the ServiceDomainMBean […]
Consuming a REST service from your ADF 12.2.1 application
With the release of ADF 12.2.1 in the fall of 2015, Oracle finally added support for declaratively consuming a RESTful web service that responds in JSON format. Until then, processing JSON from a rest web service was only possible using Java. The ability to consume and process the web service […]
Reflections after JavaOne 2015 – the platform (SE, ME, EE) and the community (me, you and us)
In terms of actual news, this year’s JavaOne conference had not very much to offer. It was a party – celebrating 20 years of Java, and at the same time a confirmation of the strength of the Java platform. Java is reconfirmed as the #1 programming language (both TIOBE index […]
Highlights and roadmaps from JavaOne 2015 Keynote session
The following are slides and scenes from the JavaOne 2015 Keynote on Sunday October 25th 2015. You can watch the on demand replay of this keynote at: https://www.oracle.com/javaone/on-demand/index.html. The Java EE 7 compliant Application Servers: Architects of Java EE Platform at IBM, Oracle and RedHat:
Make HTTP POST request from Java SE – no frills, no libraries, just plain Java
This article shows a very simple, straightforward example of making an HTTP POST call to a url (http://localhost:8080/movieevents) and sending a JSON payload to that URL. The REST service invoked in this example is the service published from Java EE as described in this article. In this second example, the […]
Publish REST service from Java SE – outside Java EE Container
The topic of this article: how to publish a REST service from a stand alone JVM with only Java SE (standard edition). So without involving any kind of Java EE container – Tomcat, WebLogic, WildFly, Jetty – I want to run a Java program and be able to invoke a […]
Unleash the power of Java API’s on your WLST scripts!
Oracle SOA Suite and many other Oracle products have extensive Java API’s to expose their functionality. WLST can often be used for relatively course grained actions. WLST (the version supplied in Weblogic 12.1.3) uses Jython 2.2.1. Jython is the Python scripting language implemented on the Java Virtual Machine. Jython allows […]
ADF Performance Monitor: Support for EJB/JPA (EclipseLink)
Not all Oracle ADF projects are built with ADF Business Components (ADF BC). Some organizations prefer to use EJB/JPA (EclipseLink) instead of ADF BC. The EclipseLink JPA provides developers with a standards based Object-Relational persistence solution. The application still reflects the Model-View-Controller architecture. In this case the model is provided by […]
Donderdag 16 april/Thursday April 16th – Speedy Joe’s – Using asynchronous interaction in Java EE to turn the world’s slowest restaurant into a super performant place
De Java SIG (Special Interest Group) van AMIS organiseert op donderdag 16 april een bijeenkomst (publiek toegankelijk) over asynchrone interacties in Java EE (web) applicaties. Synchrone interacties in de echte wereld en in IT applicaties kunnen de boel behoorlijk ophouden. Synchroon betekent wachten – en resources vasthouden. Dat kan een […]
Exposing JMS queues and topics with a JAX-WS webservice
Everyone can do HTTP calls and thus call most webservices. Interfacing with JMS queues or topics though is a bit more difficult (when not using Oracle SOA Suite). An alternative is using custom code. This usually requires libraries, JNDI lookups, opening connections and such. Because I wanted to make it […]
Updating composite properties on runtime (and being misled by the mbean browser)
Recently I walked into something strange. I had developed a simple composite application. The application is used to read a file and route the content to another service. The composite application contains composite properties as shown through the property inspector. Within the composite I am using a file-adapter to read […]
Sonatype Nexus: Retrieving artifacts using the REST API or Apache Ivy
– This blog post was also published on http://www.sonatype.org/ – Sonatype Nexus is an often used artifact repository. In a previous blog post I have shown an example how Maven can be used to assemble and release artifacts to Nexus. In this blog post I will describe two ways how artifacts […]
Oracle SOA Suite 12c: Multithreaded instance purging with the Java API
Let’s tackle a single topic at a time in this blog post ; ) SOA Suite 12c provides a Java API to perform operations on the SOA infrastructure and things running there such as composites and instances. There are several blog posts available on how to do this in SOA […]
MAF 2.0 : Custom Toggle Springboard Functionality (or how I discovered AdfmfSlidingWindowUtilities)
Mobile apps usually have the possibility to toggle the springboard by using an icon that is displayed in the header of the app. The Oracle MAF reference app, Work Better, also tries to implement this behavior. The showing of the springboard works fine, however, hiding it does not really work […]
MAF 2.0 : Loading Images in a Background Process – Part I
Images are heavily used in Mobile apps. For instance a list that contains employees usually shows the images of these employees. This works well when you have a WIFI connection, but what if you are using slower connections ? If you look at a mobile twitter app you will see […]
Using Maven to assemble and release artifacts to Nexus
An important part of a release process is storing artifacts in an artifact repository. Many customers use custom implementations of artifact repositories (such as file shares in combination with custom scripts) but there are also products which offer many functions of such a repository (and probably many more) out of […]
JavaOne 2014: Roadmaps for the near future of Java
JavaOne 2014 is first of all a community gathering – with over 500 sessions that discuss Java related topics in tantalizing details. A meeting of minds, of kindred spirits etc. It is also the place where the roadmap for the near future of the various constituents of the Java platform […]
SOA Suite 12c: Getting started with the Spring Component
The Oracle SOA Suite Spring component has been present since SOA Suite 11.1.1.3 (11gR1 PS2). This component allows easy integration of Java code with other SOA Suite components such as (among others) BPEL, BPM and Business Rules. In SOA Suite 12c (12.1.3.0) this component is still present. In This blog […]
Invoke an Asynchronous Web Service from Java (using only Java SE, no Java EE container)
A recent article (http://blog.soasuitehandbook.org/implement-an-asynchronous-web-service-using-jax-ws-in-jdeveloper/) described how to publish an Asynchronous Web Service from Java (using JAX-WS). It also showed how such a Web Service can be tested using SoapUI. A crucial aspect in the interaction with the Asynchronous Web Service is the use of WS-Addressing headers to communicate the callback […]
Implement an Asynchronous Web Service using JAX-WS in JDeveloper
This article discusses how to implement an asynchronous web service in Java EE. The Java application will expose a one way operation that will process the request and send a response message to a callback Web Service interface that is indicated in the request header through WS Addressing properties (messageID, […]
Milestone for the Java platform – The Release of Java 8
This is an important moment for Java. The general availability of Java 8 – more specifically of Java 8 SE, Embedded, (and shortly ME as well) and FX (and in the wake of all this the Hotspot JVM and NetBeans 8.0). This release is about language evolution certainly – with […]
ADF performance tuning: Whitepaper published on the ADF Performance Monitor
The AMIS ADF Performance Monitor is an advanced tool designed for measuring, analyzing, improving, and checking the performance of Oracle ADF applications. The monitor can track and collect crucial (production) performance information of the application’s runtime ADF components that are not standard provided by Oracle. It helps development, QA, and […]
Deploy Oracle ADF Essentials web application on Tomcat
Although deployment of Oracle ADF 11g web applications on Tomcat is not officially supported, we have successfully deployed several ADF 11g applications on Tomcat 6. In fact, once you know which adjustments need to be made, it is easy to deploy an ADF application on Tomcat. This post will show […]