[CAMEL-13593] avoid “expected resource not found” warnings when using camel-mail in OSGi

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 2.23.3, 2.22.5, 2.24.1, 3.0.0, 2.25.0
• Estimated Complexity: Unknown
• Assignee: Freeman Yue Fang
• Reporter: Freeman Yue Fang
• Created: 28/May/19 14:46
• Updated: 28/May/19 16:42
• Resolved: 28/May/19 16:42

Description

In javax.mail API(1.6), it(javax.mail.Session) will use authenticator's classloader to load two default files

META-INF/javamail.default.address.map
META-INF/javamail.default.providers

Since camel-mail provider a DefaultAuthenticator, which means javax mail api will try to use camel-mail bundle classloader in OSGi to load above default files. Those files aren't available for camel-mail bundle classloader, so we see warning message as

 2019-04-25 12:42:09,806 | WARN | 23 - scheduler://foo | j.mail | 21 - com.sun.mail.javax.mail - 1.6.1 | expected resource not found: /META-INF/javamail.default.providers
2019-04-25 12:42:09,807 | WARN | 23 - scheduler://foo | j.mail | 21 - com.sun.mail.javax.mail - 1.6.1| expected resource not found: /META-INF/javamail.default.address.map

This warning message isn't harmful but annoying. The javax.mail.Session will always add default stuff by code if can't find the default configuration file

       if (providers.size() == 0) {
            logger.config("failed to load any providers, using defaults");
            // failed to load any providers, initialize with our defaults
            addProvider(new Provider(Provider.Type.STORE,
                        "imap", "com.sun.mail.imap.IMAPStore",
                        "Oracle", Version.version));
            addProvider(new Provider(Provider.Type.STORE,
                        "imaps", "com.sun.mail.imap.IMAPSSLStore",
                        "Oracle", Version.version));
            addProvider(new Provider(Provider.Type.STORE,
                        "pop3", "com.sun.mail.pop3.POP3Store",
                        "Oracle", Version.version));
            addProvider(new Provider(Provider.Type.STORE,
                        "pop3s", "com.sun.mail.pop3.POP3SSLStore",
                        "Oracle", Version.version));
            addProvider(new Provider(Provider.Type.TRANSPORT,
                        "smtp", "com.sun.mail.smtp.SMTPTransport",
                        "Oracle", Version.version));
            addProvider(new Provider(Provider.Type.TRANSPORT,
                        "smtps", "com.sun.mail.smtp.SMTPSSLTransport",
                        "Oracle", Version.version));
        }
       if (addressMap.isEmpty()) {
            logger.config("failed to load address map, using defaults");
            addressMap.put("rfc822", "smtp");
        }

But it's better we can avoid such WARN message when using camel-mail in OSGi