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

Question

我在Java中有一个简单的弹性搜索代码,如下所示:

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,但我在以下行中出错:

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

它显示如下错误消息:

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,你能给我一些建议吗,我一直在寻找解决方案,但我找不到.有没有我要实现的配置？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，代码无法使用 Elasticsearch 2.0 进行编译

用这个：

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

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

参考：这是链接