primefaces 的 bean 验证（JSR 303）不起作用

Question

我正在使用：

Primefaces 6.1
JSF：2.2.10
javax.validation:1.1.0.Final
验证器实现：hibernate-validator 5.0.1.Final
GAE：1.9.52

我使用来自以下后端 bean 的 CSV（客户端验证）示例： https://www.primefaces.org/showcase/ui/csv/bean.xhtml

预期结果应该是：

我现在得到的是：

bean 验证不工作。

我在web.xml

中进行了以下配置

<context-param> 
    <param-name>primefaces.CLIENT_SIDE_VALIDATION</param-name> 
    <param-value>true</param-value> 
</context-param>

很少有类似的帖子说需要将 jsf 降级到 2.2.2，我试过了，但还是不行。

现在 CSV 的解决方法是

使用基于demo的jsf标签验证

https://www.primefaces.org/showcase/ui/csv/basic.xhtml

例如：

<p:inputText id="age" value="#{beanValidationView.age}" label="Age">
    <f:validateLongRange for="age" minimum="10" maximum="20" />
</p:inputText>

或者创建我自己的验证器

例如： http://www.supermanhamuerto.com/doku.php?id=java:validatorinprimefaces

顺便说一句，我认为它与 GAE 无关。因为我尝试使用 Tomcat 9 的新动态 Web 项目，所以它给我的结果与下面的屏幕截图所示相同。

是不是我错过了任何配置或有不同版本的 jar 导致了这个问题？

Answer 1

通过放置依赖项（即 slf4j-jdk14、slf4j-api 和 jboss-el），Hibernate Validator 在 Tomcat 9 而不是 GAE 上工作。将日志级别配置为 FINER 后，记录器显示以下条目：

May 04, 2017 9:10:08 AM com.sun.faces.config.processor.ApplicationConfigProcessor addSystemEventListener
FINE: Subscribing for event javax.faces.event.PostConstructApplicationEvent and source javax.faces.application.Application using listener org.primefaces.extensions.application.PostConstructApplicationEventListener
May 04, 2017 9:10:08 AM com.sun.faces.config.processor.ApplicationConfigProcessor isBeanValidatorAvailable
FINE: java.lang.NoClassDefFoundError: javax.naming.InitialContext is a restricted class. Please see the Google  App Engine developer's guide for more details.
java.lang.NoClassDefFoundError: javax.naming.InitialContext is a restricted class. Please see the Google  App Engine developer's guide for more details.
    at com.google.appengine.tools.development.agent.runtime.Runtime.reject(Runtime.java:50)
    at com.sun.faces.config.processor.ApplicationConfigProcessor.isBeanValidatorAvailable(ApplicationConfigProcessor.java:434)
    at com.sun.faces.config.processor.ApplicationConfigProcessor.registerDefaultValidatorIds(ApplicationConfigProcessor.java:396)
    at com.sun.faces.config.processor.ApplicationConfigProcessor.process(ApplicationConfigProcessor.java:353)
    at com.sun.faces.config.processor.AbstractConfigProcessor.invokeNext(AbstractConfigProcessor.java:152)
    at com.sun.faces.config.processor.LifecycleConfigProcessor.process(LifecycleConfigProcessor.java:137)

那是 "NoClassDefFoundError"，但是登录为 FINE 级别而不是 Warning 和 return 更有意义的消息。那么不好。

所以我对 isBeanValidatorAvailable() 做了一个小改动，使其在 GAE 上运行

static boolean isBeanValidatorAvailable() {

    boolean result = false;
    final String beansValidationAvailabilityCacheKey = 
            "javax.faces.BEANS_VALIDATION_AVAILABLE";
    Map<String,Object> appMap = FacesContext.getCurrentInstance().getExternalContext().getApplicationMap();

    if (appMap.containsKey(beansValidationAvailabilityCacheKey)) {
        result = (Boolean) appMap.get(beansValidationAvailabilityCacheKey);
    } else {
        try {       
            // Code for Google App Engine 
            ValidatorFactory validatorFactory = null;
            try{                
                Object cachedObject=FacesContext.getCurrentInstance().getExternalContext().getApplicationMap().get(BeanValidator.VALIDATOR_FACTORY_KEY);
                if (cachedObject instanceof ValidatorFactory) {
                    validatorFactory=(ValidatorFactory)cachedObject;
                } else {
                    validatorFactory=Validation.buildDefaultValidatorFactory();
                }       
            }catch(ValidationException e) {
                LOGGER.log(Level.WARNING, "Could not build a default Bean Validator factory",e);
            }               

            if (null != validatorFactory) {
                appMap.put(BeanValidator.VALIDATOR_FACTORY_KEY, validatorFactory);
                result = true;
            }             
            LOGGER.log(Level.FINE, "result=" +result +", validatorFactory=" +validatorFactory);

         /* incompatible with Google App Engine
          *
            Thread.currentThread().getContextClassLoader().loadClass("javax.validation.MessageInterpolator");
            // Check if the Implementation is available.
            Object cachedObject = appMap.get(BeanValidator.VALIDATOR_FACTORY_KEY);
            if(cachedObject instanceof ValidatorFactory) {
                result = true;
            } else {
                Context initialContext = null;
                try {
                    initialContext = new InitialContext();
                } catch (NoClassDefFoundError nde) {
                    // on google app engine InitialContext is forbidden to use and GAE throws NoClassDefFoundError 
                    if (LOGGER.isLoggable(Level.FINE)) {
                        LOGGER.log(Level.FINE, nde.toString(), nde);
                    }
                } catch (NamingException ne) {
                    if (LOGGER.isLoggable(Level.WARNING)) {
                        LOGGER.log(Level.WARNING, ne.toString(), ne);
                    }
                }

                try {
                    Object validatorFactory = initialContext.lookup("java:comp/ValidatorFactory");
                    if (null != validatorFactory) {
                        appMap.put(BeanValidator.VALIDATOR_FACTORY_KEY, validatorFactory);
                        result = true;
                    }
                } catch (NamingException root) {
                    if (LOGGER.isLoggable(Level.FINE)) {
                        String msg = "Could not build a default Bean Validator factory: " 
                                + root.getMessage();
                        LOGGER.fine(msg);                       
                    }
                }

                if (!result) {
                    try {
                        ValidatorFactory factory = Validation.buildDefaultValidatorFactory();
                        Validator validator = factory.getValidator();
                        appMap.put(BeanValidator.VALIDATOR_FACTORY_KEY, factory);
                        result = true;
                    } catch(Throwable throwable) {
                    }
                }
            }
          */
        } catch (Throwable t) { // CNFE or ValidationException or any other
            if (LOGGER.isLoggable(Level.FINE)) {
                LOGGER.fine("Unable to load Beans Validation");
            }
        }
        appMap.put(beansValidationAvailabilityCacheKey, result);
    }
    return result;
}

毕竟这个 JSR 303（Bean 验证）问题与 JSF2 上的 GAE 限制有关。

工作副本可以从 Google Drive.

获得

Answer 2

我遇到了同样的错误。我通过升级 hibernate-validator 来修复它： 5.1.3.Final 到： 5.3.5.Final

我保留了 Primefaces 6.1。

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