Spring Could not Resolve placeholder

Question

I'm fairly new to spring so excuse me if this is a dumb question. When I try to launch a program I get the following error: java.lang.IllegalArgumentException: Could not resolve placeholder 'appclient' in string value [${appclient}]. The error is thrown when the following code is executed:

package ca.virology.lib2.common.config.spring.properties; import ca.virology.lib2.config.spring.PropertiesConfig; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.beans.factory.annotation.Value; import org.springframework.context.annotation.Configuration; import org.springframework.context.annotation.Import; import org.springframework.context.annotation.PropertySource;  @Configuration @Import({PropertiesConfig.class}) @PropertySource("${appclient}") public class AppClientProperties { private static final Logger log = LoggerFactory.getLogger(AppClientProperties.class); {     //this initializer block will execute when an instance of this class is created by Spring     log.info("Loading AppClientProperties"); } @Value("${appclient.port:}") private int appClientPort;  @Value("${appclient.host:}") private String appClientHost;  public int getAppClientPort() {     return appClientPort; }  public String getAppClientHost() {     return appClientHost; } } 

A property file called appclient.properties exists in the resources folder with the information for host and port. I'm not sure where the "${appclient}" is defined, if it is at all. Maybe it is not even defined and that is causing the problem. Do I need to change the "${appclient}" to something like "{classpath:/appclient.properties}" or am I missing something else?

Answer 1

You are not reading the properties file correctly. The propertySource should pass the parameter as: file:appclient.properties or classpath:appclient.properties. Change the annotation to:

@PropertySource(value={"classpath:appclient.properties"}) 

However I don't know what your PropertiesConfig file contains, as you're importing that also. Ideally the @PropertySource annotation should have been kept there.