keystore.jks and truststore.jks can't be found in Spring Boot App - spring

Question

I wrote a 2-way authetication restful service cleint to consume a secured restful web service on port 8443 over https. Here are parts of application.properties:
trust.store=classpath:truststore.jks
trust.store.password=xyz123
key.store=classpath:keystore.jks
key.store.password=xyz123
Below are two ways to configure RestTemplate
#Configuration
public class SSLTemplate {
#Value("${key.store}")
private String keyStore;
#Value("${key.store.password}")
private String keyStorePassword;
#Value("${trust.store}")
private String trustStore;
#Value("${trust.store.password}")
private String trustStorePassword;
#Bean
public RestTemplate restTemplate(RestTemplateBuilder builder) throws Exception {
SSLContext sslContext = SSLContextBuilder.create()
.loadKeyMaterial(ResourceUtils.getFile(keyStore), keyStorePassword.toCharArray(), keyStorePassword.toCharArray())
.loadTrustMaterial(ResourceUtils.getFile(trustStoreF), trustStorePassword.toCharArray())
.build();
...
}
#Configuration
public class SSLTemplate {
#Value("${key.store}")
private Resource keyStoreR;
#Value("${key.store.password}")
private String keyStorePassword;
#Value("${trust.store}")
private Resource trustStoreR;
#Value("${trust.store.password}")
private String trustStorePassword;
#Bean
public RestTemplate restTemplate(RestTemplateBuilder builder) throws Exception {
SSLContext sslContext = SSLContextBuilder.create()
.loadKeyMaterial(keyStoreR.getURL(), keyStorePassword.toCharArray(), keyStorePassword.toCharArray())
.loadTrustMaterial(trustStoreR.getURL(), trustStorePassword.toCharArray())
.build();
...
}
When I run the app via bootRun or within Eclipse, both of them work.
But when I use jar launcer
java -jar app.jar
I got below exception.
Bean instantiation via factory method failed; nested exception is org.springframework.beans.BeanInstantiation
Exception: Failed to instantiate [org.springframework.web.client.RestTemplate]: Factory method 'restTemplate' threw exception;
nested exception is java.io.FileNotFoundException: URL cannot be resolved to absolute file path because it does not reside in the file system: jar:file:/C:/build/libs/app.jar!/BOOT-INF/classes!/truststore.jks
I have also tried
java -Djavax.net.ssl.trustStore=truststore.jks -Djavax.net.ssl.trustStorePassword=xyz123 -Djavax.net.ssl.keyStore=keystore.jks -Djavax.net.ssl.keyStorePassword=xyz123 -jar app.jar
and got the same exception. Any help will be really appreciated.

Answer 1

Try using resource.getInputStream() instead of resource.getFile() as, resource.getFile() in Spring tries to access a file system path but it can not access a path in your JAR
This link has a rich content and do take a look at Andy's answer here
Sample example:
Resource resource = resourceLoader.getResource("classpath:GeoLite2-Country.mmdb");
InputStream dbAsStream = resource.getInputStream();
and do you have use full path
-Djavax.net.ssl.trustStore=something/like/this/truststore.jks