zuotingbing created SOLR-8493:
---------------------------------

             Summary: SolrHadoopAuthenticationFilter.getZkChroot: 
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
                 Key: SOLR-8493
                 URL: https://issues.apache.org/jira/browse/SOLR-8493
             Project: Solr
          Issue Type: Bug
          Components: clients - java
    Affects Versions: 4.10.3
            Reporter: zuotingbing


[error info]
java.lang.StringIndexOutOfBoundsException: String index out of range: -1
        at java.lang.String.substring(String.java:1904)
        at 
org.apache.solr.servlet.SolrHadoopAuthenticationFilter.getZkChroot(SolrHadoopAuthenticationFilter.java:147)

[source code]:
SolrHadoopAuthenticationFilter.java

  private String getZkChroot() {
    String zkHost = System.getProperty("zkHost");
    return zkHost != null?
      zkHost.substring(zkHost.indexOf("/"), zkHost.length()) : "/solr";
  }




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