java - Does Spring MessageSource Support Multiple Class Path?

Question

I am designing a plugin system for our web based application using Spring framework. Plugins are jars on classpath. So I am able to get sources such as jsp, see below

ResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();
Resource[] pages = resolver.getResources("classpath*:jsp/*jsp");

So far so good. But I have a problem with the messageSource. It seems to me that ReloadableResourceBundleMessageSource#setBasename does NOT support multiple class path via the "classpath*:" If I use just "classpath:", I get the messageSource just only from one plugin.

Does anyone have an idea how to register messageSources from all plugins? Does exist such an implementation of MessageSource?

Answer 1

With the solution of @seralex-vi basenames /WEB-INF/messages did not function.

I overwrited the method refreshProperties on the class ReloadableResourceBundleMessageSource wich perform both type of basenames (classpath*: and /WEB-INF/)

public class SmReloadableResourceBundleMessageSource extends ReloadableResourceBundleMessageSource {

private static final String PROPERTIES_SUFFIX = ".properties";

private PathMatchingResourcePatternResolver resolver = new PathMatchingResourcePatternResolver();

@Override
protected PropertiesHolder refreshProperties(String filename, PropertiesHolder propHolder) {
    if (filename.startsWith(PathMatchingResourcePatternResolver.CLASSPATH_ALL_URL_PREFIX)) {
        return refreshClassPathProperties(filename, propHolder);
    } else {
        return super.refreshProperties(filename, propHolder);
    }
}

private PropertiesHolder refreshClassPathProperties(String filename, PropertiesHolder propHolder) {
    Properties properties = new Properties();
    long lastModified = -1;
    try {
      Resource[] resources = resolver.getResources(filename + PROPERTIES_SUFFIX);
      for (Resource resource : resources) {
        String sourcePath = resource.getURI().toString().replace(PROPERTIES_SUFFIX, "");
        PropertiesHolder holder = super.refreshProperties(sourcePath, propHolder);
        properties.putAll(holder.getProperties());
        if (lastModified < resource.lastModified())
          lastModified = resource.lastModified();
      }
    } catch (IOException ignored) { 
    }
    return new PropertiesHolder(properties, lastModified);
}

On the spring-context.xml you must have the classpath*: prefix

<bean id="messageSource" class="SmReloadableResourceBundleMessageSource">
    <property name="basenames">
        <list>
            <value>/WEB-INF/i18n/enums</value>
            <value>/WEB-INF/i18n/messages</value>
            <value>classpath*:/META-INF/messages-common</value>
            <value>classpath*:/META-INF/enums</value>
        </list>
    </property>
</bean>