Java – Does Spring @Transactional attribute work on a private method

annotationsjavaspringtransactions

If I have a @Transactional -annotation on a private method in a Spring bean, does the annotation have any effect?

If the @Transactional annotation is on a public method, it works and open a transaction.

public class Bean {
  public void doStuff() {
     doPrivateStuff();
  }
  @Transactional
  private void doPrivateStuff() {

  }
}

...

Bean bean = (Bean)appContext.getBean("bean");
bean.doStuff();

Best Answer

The answer your question is no - @Transactional will have no effect if used to annotate private methods. The proxy generator will ignore them.

This is documented in Spring Manual chapter 10.5.6:

Method visibility and @Transactional

When using proxies, you should apply the @Transactional annotation only to methods with public visibility. If you do annotate protected, private or package-visible methods with the @Transactional annotation, no error is raised, but the annotated method does not exhibit the configured transactional settings. Consider the use of AspectJ (see below) if you need to annotate non-public methods.

Related Solutions

Java – How does the Java ‘for each’ loop work

for (Iterator<String> i = someIterable.iterator(); i.hasNext();) {
    String item = i.next();
    System.out.println(item);
}

Note that if you need to use i.remove(); in your loop, or access the actual iterator in some way, you cannot use the for ( : ) idiom, since the actual iterator is merely inferred.

As was noted by Denis Bueno, this code works for any object that implements the Iterable interface.

Also, if the right-hand side of the for (:) idiom is an array rather than an Iterable object, the internal code uses an int index counter and checks against array.length instead. See the Java Language Specification.

Java – Where does the @Transactional annotation belong

I think transactions belong on the service layer. It's the one that knows about units of work and use cases. It's the right answer if you have several DAOs injected into a service that need to work together in a single transaction.

Best Answer

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Java – How does the Java ‘for each’ loop work

Java – Where does the @Transactional annotation belong

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