How to Resolve SSL Issues When Using Maven Behind a Proxy?

Dealing with SSL Issues when Using Maven behind a Proxy

When attempting to run the Maven command for archetype generation, many users encounter an error involving an invalid SSL certificate path and an inability to download from the central Maven repository. This problem often arises when working behind a corporate firewall and using a designated proxy, as the default settings might not be sufficient.

To resolve this issue, it is crucial to establish a valid connection through the proxy. Begin by configuring the proxy settings accurately in Maven's settings.xml file. Furthermore, ensure that the proper policies are in place on the firewall to allow Maven to access the necessary resources.

Should these steps not resolve the problem, consider the following workaround:

1. Use a web browser to navigate to the central Maven repository's URL (https://repo.maven.apache.org/).
2. Locate the lock icon and access the certificate details.
3. Save the certificate to your local file system.
4. Open a command prompt and import the certificate into a keystore using the keytool utility (e.g., keytool -import -file C:tempmavenCert.cer -keystore C:tempmavenKeystore).
5. Execute the Maven command again, specifying the location of the keystore using the -Djavax.net.ssl.trustStore option (e.g., mvn archetype:generate -Djavax.net.ssl.trustStore=C:tempmavenKeystore -DgroupId=com.mycompany.app -DartifactId=my-app -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false).

Optional:

To avoid repeating these steps manually, you can set the MAVEN_OPTS environment variable with the necessary parameters. This will ensure that the specified keystore is used by default.

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