Expertaya

Debugging gui events is usually not possible with regular line per line debugging and is done mostly by tracing.
For debugging code that relies on Java swing events like drag and drop, mouse moving, etc., having something similar to code below is very useful:

 
public boolean isMouseAboveHeaderPanel() {
System.out.println("HeaderPanel.isMouseAboveHeaderPanel() called from: "
+ Thread.currentThread().getStackTrace()[2].getClassName() + "."
+ Thread.currentThread().getStackTrace()[2].getMethodName());
 
// ...
 
}

In this way you trace not only current function but also you got information from where you entered that function. Of course to make things easier you should make some kind of a shortcut for entering this trace line. In Eclipse you can do that with code template:

System.out.println("${enclosing_type}.${enclosing_method}() called from: "
+ Thread.currentThread().getStackTrace()[2].getClassName() + "." 
+ Thread.currentThread().getStackTrace()[2].getMethodName());

This helped me in lot of situations, I hope that it will help you as well.

General, Java debugging, gui, Java

In certain occasions e.g. when you want to save scrapped html page or just a specific part of it (e.g. div with its contents) the recommendation I found is to use the blob type and save xml document as binary stream.

In groovy, this is achieved in a rather simple way:

class Document {
  int id
  String title
  String xmlContent
}
 
Sql sql = Sql.newInstance(
          "jdbc:mysql://localhost:3306/documents_db?useUnicode=true&characterEncoding=UTF-8&useBlobToStoreUTF8OutsideBMP=true",
          "user", "pass", "com.mysql.jdbc.Driver")
 
// We assume db table similar to:
sql.execute("""
    CREATE TABLE IF NOT EXISTS `document` (
      `id` bigint(32) NOT NULL AUTO_INCREMENT,
      `title` varchar(500) NOT NULL,
      `xmlContent` blob,
      PRIMARY KEY (`id`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
    """)
 
def saveDocuments(def docs) {
  println "Saving documents to database..."
  def documents = sql.dataSet("document")
  docs.each {Document doc ->
    documents.add(title: doc.title, xmlContent: doc.xmlContent)
  }
}

When you want to retrieve data, with Groovy this is not much complicated either:

def loadDocuments() {
  def list = []
  sql.eachRow("SELECT * FROM document") {
    Document doc = new Document(it.toRowResult())
    if (it['xmlContent'] != null) {
      doc.xmlContent = new String(it['xmlContent'])
    }
    list.add(doc)
  }
  println "Loaded ${list.size()} documents from database"
  list
}

I tried the code with mysql database but I assume that you can achieve the same with any other database.

One hint for mysql blobs and utf-8: although utf-8 charset behaves very well with other database table fields (if you add useUnicode=true and characterEncoding=UTF-8 parameters to your connection string), in order to work with utf-8  blob fields you should adjust one more parameter: useBlobToStoreUTF8OutsideBMP=true. With this parameter set, your utf8 encoded xml documents will behave well with mysql database.

Java, groovy blob, groovy, mysql, utf-8

Dynamic languages are very popular at this time and you probably had insight into at least one of them (Ruby, Python, Groovy).

If you are bound to Java platform the best way to “be dynamic” IMHO is to work with Groovy.

Apart from the http://groovy.codehaus.org/ where you can find documentation, getting started examples etc. there are many blogs around that blog about groovy.

My favorite (although very slow) is Andres Almiray’s blog. He mostly blogs about griffon and groovy and has nice tutorials and examples. There I found info about many open source libraries I never heard of but which are quite useful, for example: FEST, Glazed list, Swing clarity, etc.

Try Groovy cause it’s groovy

I felt like when I run my first program at elementary school and it wrote “Ninja” on the screen

Java, groovy groovy, Java

If you are needing behavior ‘as though a real browser was scraping and using the page’ HtmlUnit is definitely the best option available. It was designed for testing websites but works great for screen scraping and navigating through multiple pages. It takes care of cookies and other session-related stuff and can execute (if you want it to) the Javascript in the page.

I’ve personally tried several other tools from this list (Jericho, Web Harvest) but neither of them is as good as this library. For example, writing a screen scraper with Web Harvest is an easy task, but badly formatted pages cause xml parser to break and this happened to me a lot of times. Jericho is ok but it took me much more coding to achieve the same as with HtmlUnit.

Take a look at HtmlUnit getting started and start scraping in no time.

Java Java, Javascript, library, screen scraping, site scraping

Pushing-pixels by Kirill Grouchnikov is a dynamic blog on GUIs with a special attention to swing. It has weekly digest on popular swing links and is good place to start when searching for news in that field.

Java, Links gui, Java, link, swing

Ok, lets recommend resources in following categories: ebooks, blogs, forums.

Ebooks:

The JavaSeries is supported, endorsed, and authored by the creators of the Java technology at Sun Microsystems, Inc. It is the official place to go for complete, expert, and definitive information on Java technology. The books in this Series provide the inside information you need to build effective, robust, and portable applications and applets. The Series is an indispensable resource for anyone targeting the Java 2 platform.

Actually this quote is 100% true.

Blogs:

The recommendation goes to Artima.

Artima Developer is an online community where developers learn from experts in the software industry as well as interact, share information, and learn from each other.

Forum:

Javaranch - In two words - great forum. There are lot of interesting discussions at all levels (from beginner to expert). Nearly 200,000 members. Book writers are frequent forum visitors.

Java, Links blog, ebook, forum, Java

Eclipse is a well-known, widely used, etc. IDE.

In this post you can find some tips for programmers on how to use it effectively. Effectiveness is usually boosted with keyboard shortcuts and here are the most useful ones: Read more…

Java eclipse, effective, expert, keyboard, shortcuts, tips