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Welcome to Geoff Hayward's Weblog

Commenting on Java, JavaFX, Java EE, Joomla, and IoT.

This is a note on a simple regular expression to GREP for exceptions in a group of log files.

I have been debugging an issue unsure of what to look for. Of course 'Exception' on its own is not a great search term. Using a negative look-behind made the difference in trying to narrow down on what to look for. The look-behind made it possible to rule out the name of some of the exceptions that are not important to the issue at hand.



I have been experimenting with the Twitter Bower package manager as part of the tech stack to be used with a Java EE JSF project.

This post is a note on how I set up the Web Application project to use the Bower package manager.

I began by setting up a new Mavan Web Application. I used the NetBeans 'New Project' wizard. Once the new Web Application project was created I added JavaServer Faces to the project via NetBeans' Properties > Framework menu.

Next I added a .bowerrc file to the root of the webapp as:

  "directory": "resources/components"

This .bowerrc file changes the default location that Bower will store the components it downloads. This change made Bower fit with a Mavan Web Application folder structure. Next I added a bower.json file to the root of the webapp.

  "name": "bower-setup-test",
  "authors": [
    "Geoffrey Hayward"
  "private": true

The bower.json file keeps a record of each dependency and its version that is added to the project. See the bower.json spec for details.

Then from the root of the webapp I ran the command: bower install bootstrap --save. The --save saved the dependency to bower.json file.

Why Bower? Good question. To reduce the size of the tracked GIT repository and to make the web component libraries explicit. Each time a file is forked from the dependency, such as a bootstrap LESS variables file, you add it to the bower.json ignore property. Likewise you then begin tracking the forked file in GIT. Everything that is managed by Bower (that is not forked) is in (or should be in) the .gitignore file.

My Thoughts: Post Experiment

My thoughts to using Bower with a Java EE JSF project are Bower adds complexity to a Java EE JSF project that may not bring any value. But, with that said Bower certainly would come in handy for a front-end framework heavy project; particularly when some control over what should and should not be edited is needed. In other words I am undecided for now, but have no plans to start using Bower just yet in this context.


It is easy to generate a SOAP client from a WSDL with Java. Java comes with the tool named 'wsimport'. The wsimport tool is part of the Java JDK, found in the JDK bin folder. By default when you run the tool it will create and keep the compiled .class files. If you do not need the .class files just add -Xnocompile to the command.

wsimport http://localhost:8080/demo?wsdl -Xnocompile


I have been trying to get the JavaFX MediaPlayer to play MP3s. Each of the MP3s, that I have been trying to play, are being retrieved over HTTPS. The java class does not support the HTTPS protocol.

To workaround this problem meant temporarily storing the MP3 on the local disk. And then playing the MP3 from the temporary disk location.

URL url = new URL("https://resource.track.mp3");
Path mp3 = Files.createTempFile("now-playing", ".mp3");
try (InputStream stream = url.openStream()) {
        Files.copy(stream, mp3, StandardCopyOption.REPLACE_EXISTING);

Media media = new Media(mp3.toFile().toURI().toString());
MediaPlayer mediaPlayer = new MediaPlayer(media);;

Do you know of a better solution or workaround that will skip the need to write to disk when the media file is retrieved over HTTPS? Leave a comment if you do.


A colleague ask me how to convert an ArrayList to an Array in Java. Here was my answer:

List<String> results = new ArrayList<>();
results.toArray(new String[results.size()]);

Hope it's helpful. If you know of anymore ways to convert an ArrayList to an Array in Java, leave a comment.

Update: The Java 8 Lambda way: ArrayList to an Array


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