# 'java.lang.StackOverflowError' exception. Cannot evaluate org.elasticsearch.common.inject.InjectorImpl.toString()

**URL:** <https://discuss.elastic.co/t/java-lang-stackoverflowerror-exception-cannot-evaluate-org-elasticsearch-common-inject-injectorimpl-tostring/58884>\
**Category:** Elasticsearch\
**Created:** [August 25, 2016, 4:22am UTC](https://discuss.elastic.co/t/java-lang-stackoverflowerror-exception-cannot-evaluate-org-elasticsearch-common-inject-injectorimpl-tostring/58884 "2016-08-25T04:22:01Z")\
**Posts on this page:** 1\
**Showing post:** 3

<div class="post-metadata">

**Author:** ![popgis](https://avatars.discourse-cdn.com/v4/letter/p/ba9def/32.png) [@popgis](https://discuss.elastic.co/u/popgis)\
**Post date:** [August 25, 2016, 5:24am UTC](https://discuss.elastic.co/t/java-lang-stackoverflowerror-exception-cannot-evaluate-org-elasticsearch-common-inject-injectorimpl-tostring/58884/3 "2016-08-25T05:24:53Z")

</div>

The following content is the source codes of the client side.

private Client createClient(String hosts, String cluster) {  
[logger.info](http://logger.info)("the elasticsearch host: " + hosts + ", cluster is " + cluster);

```
    Client client = null;
    try {
        TransportClient build = null;
        if(null != cluster && !cluster.trim().isEmpty()) {
            Settings settings = Settings.settingsBuilder()
                    .put("client.transport.sniff", false)
                    .put("cluster.name", cluster).build();
            build = TransportClient.builder().settings(settings).build();
            logger.info("initialized the cluster elasticsearch client settings!");
        } else {
            build = TransportClient.builder().build();
        }

        String[] hostArr = hosts.split(",");

        for(String item : hostArr) {
            String[] hps = item.split(":");

            String host = "127.0.0.1";
            Integer port = 9300;

            if(hps.length > 0) {
                host = hps[0];
            }

            if(hps.length > 1) {
                port = Integer.parseInt(hps[1]);
            }

            logger.info("the elasticsearch host is " + host + ", port is " + port);

            InetAddress address = null;

            String ipExp = "\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}\\.\\d{1,3}";
            Pattern pat = Pattern.compile(ipExp);
            Matcher matcher = pat.matcher(host);

            if (matcher.matches()) {
                String[] segs = host.split("\\.");
                byte[] bs = new byte[]{Short.valueOf(segs[0]).byteValue(),
                        Short.valueOf(segs[1]).byteValue(),
                        Short.valueOf(segs[2]).byteValue(),
                        Short.valueOf(segs[3]).byteValue()};
                address = InetAddress.getByAddress(bs);
            } else {
                address = InetAddress.getByName(host);
            }

            build.addTransportAddress(new InetSocketTransportAddress(address, port));
        }

        client = build;
    } catch (UnknownHostException e) {
        logger.error("failed to initialize the elasticsearch client with the unknown host!", e);
    } catch (Exception e) {
        logger.error("failed to initialize the elasticsearch client!", e);
    }

    return client;
}
```

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_[View the full topic](https://discuss.elastic.co/t/java-lang-stackoverflowerror-exception-cannot-evaluate-org-elasticsearch-common-inject-injectorimpl-tostring/58884)._