"BindException: Address already in use" in Spring with Apache FtpServer

Question

I configured an Apache FtpServer as follows:

@Component
public class FtpDummyServer {

private FtpServer server;

@PostConstruct
public void init() throws FtpException {
    ..some initialization
    this.server = serverFactory.createServer();
    this.server.start();
}

@PreDestroy
public void stop() {
    this.server.stop();
}

Notice that the server is automatically started in the @PostConstruct. I have different tests configured in SpringBoot as follows:

@RunWith(SpringJUnit4ClassRunner.class)
@SpringApplicationConfiguration(classes = MainApplication.class)
@WebIntegrationTest
public class ApplicationTestX {
...
}

When I run the tests individually, they succeed. However, when I run them together, I get a java.net.BindException: Address already in use: bind. How can I avoid that?

What is the scope of your FtpDummyServer ? I think that you inject the FtpDummyServer many times in your test, if so try to share one FtpDummyServer for all test cases. — Abdelghani Roussi, Mar 31 '16 at 22:40
The FtpDummyServer has the @Component annotation. This is a singleton per dfault. — René Winkler, Apr 01 '16 at 06:50

score 5 · Answer 1 · answered Mar 31 '16 at 22:05

If you take a look at exception stacktrace you will see what address ftp server tries to use. Smth like

Caused by: org.apache.ftpserver.FtpServerConfigurationException: Failed to bind to address 0.0.0.0/0.0.0.0:21, check configuration

It may happen because:

Another instance of your app uses address. If so you need to terminate them.

Some other process uses address/port. In this case you can reconfigure ftp server to bind to another address.

FtpServerFactory serverFactory = new FtpServerFactory();

ListenerFactory factory = new ListenerFactory();
factory.setPort(2222); //use alternative port instead of default 21
serverFactory.addListener("default", factory.createListener());

server = serverFactory.createServer();
server.start();

Use netstat to figure out process id that holds address.

For each test, an FtpDummyServer is created. However, `@PreDestroy` was never called. `@DirtiesContext` solves the problem. — René Winkler, Apr 01 '16 at 07:26

score 2 · Accepted Answer · answered Apr 01 '16 at 08:44

2

For each test, an FtpDummyServer is created. However, @PreDestroy was never called. @DirtiesContext solves the problem.

answered Apr 01 '16 at 08:44

René Winkler

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score 0 · Answer 3 · answered Nov 24 '17 at 16:15

Using @DirtiesContext with @TestExecutionListeners works but dont forget to merge your context with the default ones. E.g:

@RunWith(SpringJUnit4ClassRunner.class)
@DirtiesContext(classMode = DirtiesContext.ClassMode.AFTER_CLASS)
@TestExecutionListeners(value = {DirtiesContextTestExecutionListener.class}, mergeMode = MergeMode.MERGE_WITH_DEFAULTS)
@SpringApplicationConfiguration(classes = MainApplication.class)
@WebIntegrationTest
public class ApplicationTestX {
...
}

Have a look there: Does Spring @DirtiesContext reload Spring context?

"BindException: Address already in use" in Spring with Apache FtpServer

3 Answers3