import org.activiti.engine.impl.scripting.BeansResolverFactory; //导入依赖的package包/类
/**
 * Initializes the {@link ScriptingEngines} and optionally the {@link ResolverFactory} of the given {@link ProcessEngineConfigurationImpl}. The
 * initialization logic has been copied from the protected initScriptingEngines() method in {@link ProcessEngineConfigurationImpl}. This initialization will
 * use the {@link SecuredScriptingEngines} implementation of {@link ScriptingEngines}.
 *
 * @param configuration the {@link ProcessEngineConfigurationImpl} whom {@link ScriptingEngines} will be initialized.
 */
private void initScriptingEngines(ProcessEngineConfigurationImpl configuration)
{
    List<ResolverFactory> resolverFactories = configuration.getResolverFactories();
    if (resolverFactories == null)
    {
        resolverFactories = new ArrayList<>();
        resolverFactories.add(new VariableScopeResolverFactory());
        resolverFactories.add(new BeansResolverFactory());
        configuration.setResolverFactories(resolverFactories);
    }
    configuration.setScriptingEngines(new SecuredScriptingEngines(new ScriptBindingsFactory(resolverFactories)));
}
 

import org.activiti.engine.impl.scripting.BeansResolverFactory; //导入依赖的package包/类
/**
 * Function to register resolver factories that used by script engines and JUEL
 * @param processEngineConfiguration
 */
private void setResolverFactories (ProcessEngineConfigurationImpl processEngineConfiguration) {
    List <ResolverFactory> resolverFactories = new ArrayList<>();
    //Resolvers from Activiti
    resolverFactories.add(new VariableScopeResolverFactory());
    resolverFactories.add(new BeansResolverFactory());
    //Resolvers added for WSO2 BPS
    resolverFactories.add(new XmlAPIResolverFactory());
    resolverFactories.add(new JsonAPIResolverFactory());
    processEngineConfiguration.setResolverFactories(resolverFactories);
}