Why Does Maven Experience SSL Issues Behind a Proxy?

Does Maven Have Issues Using SSL Behind a Proxy?

Maven has encountered errors when utilizing SSL and proxy connections, particularly when accessing the central Maven repository (https://repo.maven.apache.org/maven2). The error "SunCertPathBuilderException: unable to find valid certification path to requested target" signifies that Maven is having trouble verifying the SSL certificate of the repository.

Why Is This Occurring?

Typically, everyone who uses Maven downloads and runs it without facing issues. The problem is likely rooted in the proxy server configuration.

Troubleshooting

Here's a step-by-step troubleshooting guide:

1. Navigate to the Repository's URL

• Use a browser (such as Internet Explorer) to visit the Maven central repository (https://repo.maven.apache.org/).

2. Retrieve Repository Certificate

• Click on the lock icon and select "View Certificate."
• In the "Details" tab, choose "Save to File" and specify the file type as "Base 64 X.509 (.CER)." Save the certificate to a location on your computer.

3. Import Certificate into Truststore

• Open a command prompt and run the following command (modify the paths to match your setup):

keytool -import -file C:\temp\mavenCert.cer -keystore C:\temp\mavenKeystore

4. Run Maven Command with Additional Parameter

• Now, execute the Maven command again with the added parameter "-Djavax.net.ssl.trustStore=C:tempmavenKeystore" to specify the location of the truststore containing the imported certificate.

Optional Step:

Set MAVEN_OPTS Environment Variable

• To avoid having to specify the truststore each time, you can set the MAVEN_OPTS environment variable:

MAVEN_OPTS="-Djavax.net.ssl.trustStore=C:\temp\mavenKeystore"

This will ensure that Maven always uses the specified truststore.

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