JCabi aspects @RetryOnFailure how to throw exception

Question

I want to manually call for a retry on a method by using JCabi. Aspect oriented programming should make this easy but I can't figure it out.

import com.jcabi.aspects.RetryOnFailure;

public class Example
{

    public int j;

    @RetryOnFailure(attempts = 4, delay = 100, verbose = true)
    public void retryFun() throws Exception
    {
        j++;
        if(j<3)
            throw new Exception();
        else
            return;
    }

    public static void main(String[] args) throws Exception
    {
        Example example = new Example();
        System.out.println(example.j);
        example.retryFun();
        System.out.println(example.j);
    }
}

The only example available from jcabi is this one below which doesn't show how to throw an exception to force retry call:

Annotate your methods with @RetryOnFailure annotation and in case of exception in the method its execution will be repeated a few times:
public class Resource {
  @RetryOnFailure(attempts = 2, delay = 10, verbose = false)
  public String load(URL url) {
    return url.openConnection().getContent();
  }
}
In an exception occurs the method will retry two times, with a 10 msec delay between attempts.

score 7 · Answer 1 · edited Mar 04 '16 at 15:36

For those of you out there still looking for an answer, Yegor's answer is now outdated. The jcabi-maven-plugin version 0.8 he posted wasn't working for me.

After some hours of digging I have found this which states that we should use the last version As of this time, July 2014 is 0.9.2.

That was my answer for why when running mvn jcabi:ajc I was getting errors from the link and also the weaving not working.

yegor256 · Accepted Answer · 2014-02-02T11:31:07.933

Indeed, just using jcabi annotations is not enough. You should "weave" your source code or binaries. I would recommend to weave binaries, as explained here: http://aspects.jcabi.com/example-weaving.html. Add this plugin to your pom.xml and you're done:

<plugin>
    <groupId>com.jcabi</groupId>
    <artifactId>jcabi-maven-plugin</artifactId>
    <version>0.8</version>
    <executions>
      <execution>
        <goals>
          <goal>ajc</goal>
        </goals>
      </execution>
    </executions>
</plugin>

score 0 · Answer 3 · answered Sep 19 '13 at 14:42

0

Ok unfortunately I found out these jcabi aspects need a custom pom.xml task to compile the required aspects in the project.

So dropping the jcabi jar inside NetBeans and compiling the above code is not enough.

answered Sep 19 '13 at 14:42

dendini

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score 0 · Answer 4 · answered Aug 03 '17 at 05:47

Alternatives, you can add these configuration to pom.xml to weave at compilation time.

<plugin>
  <groupId>org.codehaus.mojo</groupId>
  <artifactId>aspectj-maven-plugin</artifactId>
  <version>1.4</version>
  <configuration>
      <complianceLevel>1.6</complianceLevel>
      <encoding>${project.build.sourceEncoding}</encoding>
      <showWeaveInfo>true</showWeaveInfo>
      <source>1.7</source>
      <target>1.7</target>
      <verbose>true</verbose>
      <aspectLibraries>
          <aspectLibrary>
              <groupId>com.jcabi</groupId>
              <artifactId>jcabi-aspects</artifactId>
          </aspectLibrary>
      </aspectLibraries>
  </configuration>
  <executions>
      <execution>
          <id>weave-classes</id>
          <phase>process-classes</phase>
          <goals>
              <goal>compile</goal>
          </goals>
      </execution>
  </executions>
</plugin>

Reference: http://aspects.jcabi.com/example-aspectj.html

JCabi aspects @RetryOnFailure how to throw exception

4 Answers4