SOAP JAXWS client intermittent error calling services - soap

Question

I have a webapp with SpringBoot 2.2.6, Java 8, JBoss 7.2 EAP, now for testing purpose I start my app with bootdashboard (and so with tomcat).
I have to call SOAP WebServices which the customer exposes. With this plugin:
<plugin>
<groupId>org.codehaus.mojo</groupId>
<artifactId>jaxws-maven-plugin</artifactId>
<version>2.6</version>
<executions>
<execution>
<goals>
<goal>wsimport</goal>
</goals>
</execution>
</executions>
<configuration>
<wsdlDirectory>${project.basedir}/src/main/resources/</wsdlDirectory>
<packageName>it.pegaso2000.agevolo.sace.ws.client</packageName>
<sourceDestDir>
${project.build.directory}/generated-sources/
</sourceDestDir>
</configuration>
</plugin>
I have created my client. Now I have added a configuration classes as below:
#Configuration
public class SOAPClientConfiguration {
#Value("${jks.auth.path}")
private String jksPath;
#Value("${jks.auth.pass}")
private String jksPass;
private final URL url = getClass().getClassLoader().getResource("customer.wsdl");
#Bean
public MainServices mainServices() {
try {
SSLContext sc = SSLContext.getInstance("TLSv1.2");
KeyManagerFactory kmf = KeyManagerFactory.getInstance( KeyManagerFactory.getDefaultAlgorithm() );
KeyStore ks = KeyStore.getInstance("JKS");
ks.load( new FileInputStream(jksPath), jksPass.toCharArray() );
kmf.init( ks, jksPass.toCharArray() );
sc.init( kmf.getKeyManagers(), null, null );
GaranzieItaliaApi api = new GaranzieItaliaApi(url);
GaranzieItaliaServices port = api.getGaranzieItaliaApiPort();
((BindingProvider) port).getRequestContext().put(
"com.sun.xml.internal.ws.transport.https.client.SSLSocketFactory", sc.getSocketFactory() );
return port;
} catch (NoSuchAlgorithmException e) {
log.error(e.getLocalizedMessage(), e);
} catch (KeyStoreException e) {
log.error(e.getLocalizedMessage(), e);
} catch (CertificateException e) {
log.error(e.getLocalizedMessage(), e);
} catch (FileNotFoundException e) {
log.error(e.getLocalizedMessage(), e);
} catch (IOException e) {
log.error(e.getLocalizedMessage(), e);
} catch (UnrecoverableKeyException e) {
log.error(e.getLocalizedMessage(), e);
} catch (KeyManagementException e) {
log.error(e.getLocalizedMessage(), e);
}
return null;
}
}
Now I autowire the MainServices (created by plugin) inside my #Service.
It works but I cannot do consecutive calls without having back the 401 Unauthorize error!
I have read several articles regarding keep-alive header but I still haven't been able to make it work.
I have tried adding headers as follow:
Map<String, List<String>> headers = new HashMap<>();
headers.put("Connection", Collections.singletonList("Keep-Alive"));
headers.put("keep-alive", Collections.singletonList("timeout=10"));
also
headers.put("keep-alive", Collections.singletonList("timeout=60000"));
or
headers.put("keep-alive", Collections.singletonList("timeout=10, max = 1"));
but nothing works. Any help is appreciated