You must configure the proxy server for runtime use.
FMW_HOME/user_projects/domains/WLS_SOA/bin/setDomainEnv.sh.EXTRA_JAVA_PROPERTIES:
EXTRA_JAVA_PROPERTIES="${EXTRA_JAVA_PROPERTIES}
-Djavax.net.ssl.trustStore=kss://system/trust
-Djavax.net.ssl.trustStoreType=kss
-Dhttp.proxyHost=www-proxy.us.oracle.com
-Dhttp.proxyPort=80
-Dhttp.nonProxyHosts=localhost|*.us.example.com
*.opcsbcs.oraclecloud.internal|127.0.0.1|Managed_Server1_IP_address|
Managed_Server2_IP _address|10.*.*.*|*.foo.com|etc
-Dhttps.proxyHost=www-proxy.us.oracle.com
-Dhttps.proxyPort=80"
Where is the host name of your proxy server. and .us.example.comManaged_Server1_IP_address and Managed_Server2_IP_address are your managed server IP addresses.
For more information about using the cloud adapters with Oracle SOA Cloud Service, see About the Cloud Adapter Pack.