exception - 为什么我的 elasticsearch 无法在 JAVA API 中构建 transportclient？

Question

我在 Java 中有一个简单的 elasticsearch 代码是这样的:

public class TryElastic {

public static void main(String[] args) throws UnknownHostException {

    Map<String, Object> json = new HashMap<String, Object>();
    json.put("user","kimchy");
    json.put("postDate",new Date());
    json.put("message","trying out Elasticsearch");

    try {
        Settings settings = Settings.settingsBuilder()
            .put("cluster.name", "elasticsearch")
            .put("client.transport.sniff", true).build();

        TransportClient client = TransportClient.builder().settings(settings).build();
        //client.addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9300));
    } catch (NoNodeAvailableException e) {
        System.out.println(e.toString());
    }

    System.out.println("test");
}

这很简单，但我在以下行中遇到错误:

TransportClient client = TransportClient.builder().settings(settings).build();

它显示如下错误信息:

Exception in thread "main" java.lang.NullPointerException
at java.io.Reader.<init>(Reader.java:78)
at java.io.InputStreamReader.<init>(InputStreamReader.java:113)
at org.elasticsearch.node.internal.InternalSettingsPreparer.randomNodeName(InternalSettingsPreparer.java:198)
at org.elasticsearch.node.internal.InternalSettingsPreparer.finalizeSettings(InternalSettingsPreparer.java:177)
at org.elasticsearch.node.internal.InternalSettingsPreparer.prepareSettings(InternalSettingsPreparer.java:64)
at org.elasticsearch.client.transport.TransportClient$Builder.build(TransportClient.java:119)
at TryElastic.main(TryElastic.java:64)

所以，你能给我建议吗，我一直在寻找解决方案，但找不到。有没有我必须实现的配置？我的 elasticsearch 服务器已正确运行，它可以执行索引并从命令提示符获取查询。谢谢...

Answer 1

这段代码对我有用。这是版本问题。 TransportClient 的默认端口是 9300 并且代码不使用 Elasticsearch 2.0 编译

使用这个:

设置 settings = Settings.settingsBuilder() .put("cluster.name", clusterName).build();

客户端客户端 = TransportClient.builder().settings(settings).build() .addTransportAddress(new InetSocketTransportAddress(new InetSocketAddress("127.0.0.1", 9300)));

引用:Here's the link