JPA links (updated)

Reference implementation.

Official documentation:

• JSR 317 JPA 2 specification
• JSR 338 JPA 2.1 specification
• API Javadoc
• Hibernate API Javadoc

Others:

•  Wikibook (incomplete)

Providers often have good JPA documentation as well. Might include extensions (and JDO stuff) though:

• Open JPA
  
• EclipseLink JPA
• DataNucleus
• ObjectDB

Specific topics:

• JPA 2.x what's new
• Where to define JPQL queries
• Caching 
• Validation

Background:

•  ORM hate

Callable ManagedTaskListener

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class Japavapa implements Callable, ManagedTask, ManagedTaskListener {       String word;     LocalTime submit;       public Japavapa(String word) {       this.word = word;     }       public String toString() {       return ":P " + word;     }       @Override     public String call() throws Exception {       Random rand = new Random();       Thread.currentThread().sleep(rand.nextInt(1000));       Matcher match = Pattern.compile("([AEIOUYaeiouy]+)").matcher(word);       return match.find() ? match.replaceAll(match.group(1) + "p" + match.group(1)) : word;     }       @Override     public ManagedTaskListener getManagedTaskListener() {       return this;     }       @Override     public Map<String, String> getExecutionProperties() {       return null;     }       @Override     public void taskSubmitted(Future<?> future, ManagedExecutorService executor, Object task) {       submit = LocalTime.now();       logger.info("SUBMIT " + task         + " AT " + submit         + " ON " + executor);     }       @Override     public void taskAborted(Future<?> future, ManagedExecutorService executor, Object task, Throwable exception) {       logger.info("ABORTED " + task         + " AFTER " + Duration.between(submit, LocalTime.now()).toMillis()         + "ms ON " + Thread.currentThread().getName());     }       @Override     public void taskDone(Future<?> future, ManagedExecutorService executor, Object task, Throwable exception) {       logger.info("DONE " + task         + " AFTER " + Duration.between(submit, LocalTime.now()).toMillis() + "ms");     }       @Override     public void taskStarting(Future<?> future, ManagedExecutorService executor, Object task) {       logger.info("STARTING " + task         + " AFTER " + Duration.between(submit, LocalTime.now()).toMillis()         + "ms ON " + Thread.currentThread().getName());     }     }