tomcat中使用StringManager来管理错误提示信息，错误信息存储在LocalStrings.properties文件中，支持包级别的文件配置。

StringManager

构造函数私有，通过静态方法getManager获取对应package的实例

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private static final Hashtable<String, StringManager> managers =
        new Hashtable<>();

/**
 * Get the StringManager for a particular package. If a manager for
 * a package already exists, it will be reused, else a new
 * StringManager will be created and returned.
 *
 * @param packageName The package name
 */
public static final synchronized StringManager getManager(String packageName) {
    StringManager mgr = managers.get(packageName);
    if (mgr == null) {
        mgr = new StringManager(packageName);
        managers.put(packageName, mgr);
    }
    return mgr;
}

LocalStrings

本身支持国际化(i18n), LocalStrings.properties（英文）、LocalStrings_es.properties（西班牙语）、LocalStrings_ja.properties（日语）

文件示例：

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contextBindings.unknownContext=Unknown context name : {0}
contextBindings.noContextBoundToThread=No naming context bound to this thread
contextBindings.noContextBoundToCL=No naming context bound to this class loader
selectorContext.noJavaUrl=This context must be accessed through a java: URL
selectorContext.methodUsingName=Call to method ''{0}'' with a Name of ''{1}''

参考

  1. 《How tomcat works》