小编Abh*_*wal的帖子

db.html

<div th:each="pr, stat: *{mergeMap}">
    <tr>
        <td><input type="text" name="key" th:value="${pr.key}" /></td>
        <td><input type="text" name="value" th:value="${pr.value}" /></td>
    </tr>
</div>

在提交此输入时,我总是在Spring Controller中将mergeMap设置为空.应该怎么做才能获得mergeMap的值？

Controller.java

@RequestMapping(value = "/shot")
    public String saveMergeProducts(@ModelAttribute(value="prod") MergedProductInfoDTO prod, BindingResult bindingResult, 
            Model model, HttpServletRequest request) {
        System.out.println(prod.toString());
        return "forward:/backoffice/db";
    }

HTML

<form action="#" th:action="@{shot}" method="POST" th:object="${prod}">
            <tr>
            <td><span th:text="${index.index}"></span></td>
                <td><input type="text" name="id" th:value="*{id}" th:readonly="readonly" /></td>
                <td><input type="text" name="categoryName" th:value="*{categoryName}" th:readonly="readonly" /></td>
                <td><input type="text" name="subCategoryName" th:value="*{subCategoryName}" th:readonly="readonly" /></td>
                <td><input type="text" name="productBrand" th:value="*{productBrand}" /></td>
                <td><input type="text" name="productSubBrand" th:value="*{productSubBrand}" /></td>
                <td><input type="text" name="series" …

我在尝试在增加集群大小并查看index_create_block_exception之后在AWS ElasticSearch集群中创建新索引.我怎么能纠正这个？我试过搜索但没有得到确切的答案.谢谢.

curl -XPUT 'http://<aws_es_endpoint>/optimus/'

{"error":{"root_cause":[{"type":"index_create_block_exception","reason":"blocked by: [FORBIDDEN/10/cluster create-index blocked (api)];"}],"type":"index_create_block_exception","reason":"blocked by: [FORBIDDEN/10/cluster create-index blocked (api)];"},"status":403}

我已经定义log4j2.properties为

    ...
    appender.async.type = Async
    appender.async.name = async
    appender.async.appenderRefs.type = AppenderRefs
    appender.async.appenderRefs.consoleAppender.type = AppenderRef
    appender.async.appenderRefs.consoleAppender.ref = console

    rootLogger.level = debug
    rootLogger.appenderRef.console.ref = async
    rootLogger.appenderRef.rolling.ref = rolling

运行时异常：

2019-06-28 12:03:27,996 main ERROR Could not create plugin of type class org.apache.logging.log4j.core.appender.AsyncAppender for element Async: java.lang.NullPointerException java.lang.NullPointerException
        at org.apache.logging.log4j.core.config.plugins.visitors.PluginElementVisitor.visit(PluginElementVisitor.java:52)
        at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.injectFields(PluginBuilder.java:180)
        at org.apache.logging.log4j.core.config.plugins.util.PluginBuilder.build(PluginBuilder.java:121)
        at org.apache.logging.log4j.core.config.AbstractConfiguration.createPluginObject(AbstractConfiguration.java:964)

...

2019-06-28 12:03:27,997 main ERROR Unable to invoke factory method in class org.apache.logging.log4j.core.appender.AsyncAppender for element Async: java.lang.IllegalStateException: No factory method found for class org.apache.logging.log4j.core.appender.AsyncAppender java.lang.IllegalStateException: No …

我已经实现了自定义 ServerHttpRequestDecorator 来获取请求正文，但无法对响应执行相同的操作。

@Override
    public Mono<Void> filter(ServerWebExchange exchange, WebFilterChain chain)
    {
        long start = System.currentTimeMillis();
        LogServerWebExchangeDecorator exchangeDecorator = new LogServerWebExchangeDecorator(
                exchange);
        exchangeDecorator.getResponse().beforeCommit(() ->
        {
            logRequest(exchangeDecorator.getRequest(), exchangeDecorator.getRequestBody());
            logResponse(exchangeDecorator.getRequest(), exchangeDecorator.getResponse(), start);
            return Mono.empty();
        });
        return chain.filter(exchangeDecorator);
    }

如何才能达到同样的效果呢？

我正在尝试通过 BatchStatement 将一个对象持久化到 cassandra

import com.datastax.driver.mapping.Mapper;

batch.add(mapper.saveQuery(itr.next()));

我想要IF NOT EXISTS子句，例如

INSERT INTO customer_account (customerID, customer_email) 
VALUES (‘LauraS’, ‘lauras@gmail.com’)
IF NOT EXISTS;

我应该如何通过 saveQuery 实现 IF NOT EXISTS？

我正在使用 Cassandra 2.1.9 密钥空间

WITH replication = {'class': 'NetworkTopologyStrategy', 'datacenter1': '4'}  AND durable_writes = true;

现在一个节点已关闭，我想截断其中一张表。我该怎么做？我现在无法启动我的第四个节点。我如何才能防止将来出现此类问题？