[help!] java.lang.NoSuchMethodError: org.apache.solr.client.solrj.request.schema.SchemaRequest

[yx zhou]

Got the following errow when i try to delete a field with Schema API,  on
Solr 7.0.1,  cloud model

java.lang.NoSuchMethodError:
org.apache.solr.client.solrj.request.schema.SchemaRequest$SchemaRequestJSONWriter.writeString(Ljava/lang/String;)V

at
org.apache.solr.client.solrj.request.schema.SchemaRequest$SchemaRequestJSONWriter.write(SchemaRequest.java:824)
at
org.apache.solr.client.solrj.request.schema.SchemaRequest$Update.getContentStreams(SchemaRequest.java:711)
at
org.apache.solr.client.solrj.request.RequestWriter.getContentStreams(RequestWriter.java:51)
at
org.apache.solr.client.solrj.impl.BinaryRequestWriter.getContentStreams(BinaryRequestWriter.java:53)
at
org.apache.solr.client.solrj.impl.HttpSolrClient.createMethod(HttpSolrClient.java:330)
at
org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:251)
at
org.apache.solr.client.solrj.impl.HttpSolrClient.request(HttpSolrClient.java:242)
at
org.apache.solr.client.solrj.impl.LBHttpSolrClient.doRequest(LBHttpSolrClient.java:483)
at
org.apache.solr.client.solrj.impl.LBHttpSolrClient.request(LBHttpSolrClient.java:413)
at
org.apache.solr.client.solrj.impl.CloudSolrClient.sendRequest(CloudSolrClient.java:1121)
at
org.apache.solr.client.solrj.impl.CloudSolrClient.requestWithRetryOnStaleState(CloudSolrClient.java:862)
at
org.apache.solr.client.solrj.impl.CloudSolrClient.request(CloudSolrClient.java:793)
at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:178)
at org.apache.solr.client.solrj.SolrRequest.process(SolrRequest.java:195)
at org.janusgraph.diskstorage.solr.SolrUtil.deleteField(SolrUtil.java:286)
at org.janusgraph.diskstorage.solr.SolrUtil.fieldsSync(SolrUtil.java:249)

My code is

public static void deleteField(CloudSolrClient client, String
collection, String fieldName)
    throws IOException, SolrServerException {
    SchemaRequest.DeleteField deleteFieldRequest = new
SchemaRequest.DeleteField(fieldName);

    client.setDefaultCollection(collection);
    SchemaResponse.UpdateResponse deleteFieldResponse =
deleteFieldRequest.process(client);
}