Elasticsearch Java API error "NoClassDefFoundError"

Question

I'm using the Java API. I tried the following:

Client client = TransportClient.builder().build() 
 .addTransportAddress(new InetSocketTransportAddress(InetAddress.getByName("localhost"), 9200));

But it gave me the following error:

Exception in thread "main" java.lang.NoClassDefFoundError:       com/google/common/collect/ImmutableMap
at org.elasticsearch.client.transport.TransportClient$Builder.<init>(TransportClient.java:84)
at org.elasticsearch.client.transport.TransportClient.builder(TransportClient.java:76)
at tools.Tools.Searcher(Tools.java:195)
at tools.Tools.main(Tools.java:60)
Caused by: java.lang.ClassNotFoundException: com.google.common.collect.ImmutableMap
at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
... 4 more
Java Result: 1

I am using Elasticsearch 2.0.0 and it is running on port 9200

What is causing that error and how can I fix it?

Answer 1

I have this problem too, but when i add the guava-18.0.jar into build path ,it works. Hope it works for you.

Answer 2

You can use Unirest API for Java. It is very easy to use.

http://unirest.io/java.html

Check it's documentation. I myself am a beginner and I found this very easy to implement.

Just add the following maven dependency in your pom file.

<dependency>
    <groupId>com.mashape.unirest</groupId>
    <artifactId>unirest-java</artifactId>
    <version>1.4.7</version>
</dependency>

And your java implementation would be like this:

HttpResponse<String> response = Unirest.get("http:localhost:9200").asString();