Java - Spring - SSL configuration: proxy, custom trust store

SslConfiguration.java

import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Configuration;
import org.springframework.core.io.ClassPathResource;
import org.springframework.util.StringUtils;

import javax.annotation.PostConstruct;
import java.io.File;
import java.io.InputStream;
import java.nio.file.Files;

@Configuration
@Slf4j
public class SslConfiguration {
    @Autowired
    private ProxyConfiguration proxyConfiguration;

    @PostConstruct
    private void configureSSL() {
        if (log.isDebugEnabled()) {
            System.setProperty("ssl.debug", "true");
            System.setProperty("javax.net.debug", "ssl");
        }

        String truststoreLocation = trustStorePath();
        if (!StringUtils.isEmpty(truststoreLocation)) {
            System.setProperty("javax.net.ssl.trustStore", truststoreLocation);
            System.setProperty("javax.net.ssl.trustStoreType", "JKS");
        }
        String proxyUrl = proxyConfiguration.getUrl();
        String proxyPort = String.valueOf(proxyConfiguration.getPort());
        if (!StringUtils.isEmpty(proxyUrl)) {
            System.setProperty("http.proxyHost", proxyUrl);
            System.setProperty("http.proxyPort", proxyPort);
            System.setProperty("https.proxyHost", proxyUrl);
            System.setProperty("https.proxyPort", proxyPort);

            String login = proxyConfiguration.getLogin();
            if(!StringUtils.isEmpty(login)) {
                String password = proxyConfiguration.getPassword();
                System.setProperty("http.proxyUser", login);
                System.setProperty("http.proxyPassword", password);
                System.setProperty("https.proxyUser", login);
                System.setProperty("https.proxyPassword", password);
            }
        }
    }

    /**
     * 'custom-cacerts'  is a copy of the JDK cacerts (jdk<version>\jre\lib\security) with a custom SSL certificate (self-sifned).

     */
    public String trustStorePath() {
        ClassPathResource classPathResource = new ClassPathResource("cacerts/custom-cacerts");

        /** Creer une copie dans le répértoire temporaire*/
        try {
            File copy = File.createTempFile("cacert", ".jks");
            try (InputStream inputStream = classPathResource.getInputStream()) {
                Files.copy(inputStream, copy.toPath(),
                           java.nio.file.StandardCopyOption.REPLACE_EXISTING);
            }
            return copy.getAbsolutePath();
        } catch (Exception e) {
            log.error("Copy failed {}", e.getMessage());
        }
        return null;
    }
}