JsonXContentGenerator的Elasticsearch 2.0 NoClassDefFoundError

Question

我正在尝试将我的elasticsearch java客户端api版本从1.4.2更新到2.0.0.我使用的是java 1.8.我使用这段代码:

   XContentBuilder builder = XContentFactory.jsonBuilder()

它曾经在1.4.2中工作但我在2.0.0中得到了这个例外:

   Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.elasticsearch.common.xcontent.json.JsonXContentGenerator
   at org.elasticsearch.common.xcontent.json.JsonXContent.newXContentGenerator(JsonXContent.java:69) ~[elasticsearch-2.0.0.jar:2.0.0]
   at org.elasticsearch.common.xcontent.json.JsonXContent.createGenerator(JsonXContent.java:74) ~[elasticsearch-2.0.0.jar:2.0.0]
   at org.elasticsearch.common.xcontent.json.JsonXContent.createGenerator(JsonXContent.java:80) ~[elasticsearch-2.0.0.jar:2.0.0]
   at org.elasticsearch.common.xcontent.XContentBuilder.<init>(XContentBuilder.java:112) ~[elasticsearch-2.0.0.jar:2.0.0]
   at org.elasticsearch.common.xcontent.XContentBuilder.<init>(XContentBuilder.java:102) ~[elasticsearch-2.0.0.jar:2.0.0]
   at org.elasticsearch.common.xcontent.XContentBuilder.builder(XContentBuilder.java:80) ~[elasticsearch-2.0.0.jar:2.0.0]
   at org.elasticsearch.common.xcontent.json.JsonXContent.contentBuilder(JsonXContent.java:40) ~[elasticsearch-2.0.0.jar:2.0.0]
   at org.elasticsearch.common.xcontent.XContentFactory.contentBuilder(XContentFactory.java:122) ~[elasticsearch-2.0.0.jar:2.0.0]
   at org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder(XContentFactory.java:49) ~[elasticsearch-2.0.0.jar:2.0.0]

在pom.xml中:

   <dependency>
       <groupId>org.elasticsearch</groupId>
       <artifactId>elasticsearch</artifactId>
       <version>2.0.0</version>
   </dependency>

Answer 1

原因是我的依赖项列表中没有com.fasterxml.jackson.core,所以这是造成的

        java.lang.ClassNotFoundException: com.fasterxml.jackson.core.util.DefaultIndenter

我把它添加到我的pom.xml中:

        <dependency>
            <groupId>com.fasterxml.jackson.core</groupId>
            <artifactId>jackson-core</artifactId>
            <version>2.6.3</version>
        </dependency>

问题解决了!