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.

Answer 2

If you are using Spring 3.1 and above, you can use something like...

@Configuration
@PropertySource("classpath:foo.properties")
public class PropertiesWithJavaConfig {

@Bean
public static PropertySourcesPlaceholderConfigurer propertySourcesPlaceholderConfigurer() {
  return new PropertySourcesPlaceholderConfigurer();
}
}

You can also go by the xml configuration like...

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:context="http://www.springframework.org/schema/context"
xsi:schemaLocation="
  http://www.springframework.org/schema/beans 
  http://www.springframework.org/schema/beans/spring-beans-3.2.xsd
  http://www.springframework.org/schema/context 
  http://www.springframework.org/schema/context/spring-context-3.2.xsd">

  <context:property-placeholder location="classpath:foo.properties" />

  </beans>

In earlier versions.

Answer 3

Hopefully it will be still helpful, the application.properties (or application.yml) file must be in both the paths:

• src/main/resource/config
• src/test/resource/config

containing the same property you are referring

Answer 4

如果您的配置文件位于与类路径不同的路径中，您可以将配置文件路径添加为系统属性：

java -Dapp.config.path=path_to_config_file -jar your.jar

Answer 5

I know It is an old message , but i want to add my case.

If you use more than one profile(dev,test,prod...), check your execute profile.

Answer 6

For properties that need to be managed outside of the WAR:

<context:property-placeholder location="file:///C:/application.yml"/>

For example if inside application.yml are name and id

Then you can create bean in runtime inside xml spring

<bean id="id1" class="my.class.Item">
    <property name="name" value="${name}"/>
    <property name="id" value="${id}"/>
</bean>

Answer 7

就我而言，生成的战争文件没有获取属性文件，因此必须在 IntelliJ 编辑器中再次进行全新安装。

Answer 8

就我而言，我忘记在 test 文件夹下的 application.properties 中添加新属性。添加它解决了问题

Answer 9

If the issue occurs in IntelliJ, all you have to do is to install the plugin https://plugins.jetbrains.com/plugin/7861-envfile and follow the steps given.

Answer 10

My solution was to add a space between the $ and the {.

For example:

@Value("${appclient.port:}")

becomes

@Value("$ {appclient.port:}")