[ 
https://issues.apache.org/jira/browse/HBASE-17212?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Yu Li updated HBASE-17212:
--------------------------
    Description: 
If we run below codes:
{code}
Table table = connection.getTable(null);
{code}
we will see below exception:
{noformat}
java.lang.NullPointerException
        at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:221)
        at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:182)
        at 
org.apache.hadoop.hbase.client.ConnectionImplementation.getTable(ConnectionImplementation.java:298)
        at 
org.apache.hadoop.hbase.client.ConnectionImplementation.getTable(ConnectionImplementation.java:293)
{noformat}

And in this JIRA we will add a null checker and throw a more graceful 
{{IllegalArgumentException}}

For RegionServerCallable, we're lacking of some null checker when using table 
name, such as in {{RegionServerCallable#prepare}}:
{code}
   public void prepare(final boolean reload) throws IOException {
     // check table state if this is a retry
    if (reload && !tableName.equals(TableName.META_TABLE_NAME) &&
        getConnection().isTableDisabled(tableName)) {
       throw new TableNotEnabledException(tableName.getNameAsString() + " is 
disabled.");
     }
{code}
It will throw NPE if tableName is null and invoking {{tableName.equals}}. We'll 
add null checker in such places.

  was:
If we run below codes:
{code}
Table table = connection.getTable(null);
{code}
we will see below exception:
{noformat}
java.lang.NullPointerException
        at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:221)
        at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:182)
        at 
org.apache.hadoop.hbase.client.ConnectionImplementation.getTable(ConnectionImplementation.java:298)
        at 
org.apache.hadoop.hbase.client.ConnectionImplementation.getTable(ConnectionImplementation.java:293)
{noformat}

And in this JIRA we will add a null checker and throw a more graceful 
{{IllegalArgumentException}}


> Should add null checker on table name in HTable constructor and 
> RegionServerCallable
> ------------------------------------------------------------------------------------
>
>                 Key: HBASE-17212
>                 URL: https://issues.apache.org/jira/browse/HBASE-17212
>             Project: HBase
>          Issue Type: Improvement
>    Affects Versions: 2.0.0
>            Reporter: Yu Li
>            Assignee: Yu Li
>             Fix For: 2.0.0, 1.4.0
>
>         Attachments: HBASE-17212.patch, HBASE-17212.v2.patch
>
>
> If we run below codes:
> {code}
> Table table = connection.getTable(null);
> {code}
> we will see below exception:
> {noformat}
> java.lang.NullPointerException
>       at org.apache.hadoop.hbase.client.HTable.finishSetup(HTable.java:221)
>       at org.apache.hadoop.hbase.client.HTable.<init>(HTable.java:182)
>       at 
> org.apache.hadoop.hbase.client.ConnectionImplementation.getTable(ConnectionImplementation.java:298)
>       at 
> org.apache.hadoop.hbase.client.ConnectionImplementation.getTable(ConnectionImplementation.java:293)
> {noformat}
> And in this JIRA we will add a null checker and throw a more graceful 
> {{IllegalArgumentException}}
> For RegionServerCallable, we're lacking of some null checker when using table 
> name, such as in {{RegionServerCallable#prepare}}:
> {code}
>    public void prepare(final boolean reload) throws IOException {
>      // check table state if this is a retry
>     if (reload && !tableName.equals(TableName.META_TABLE_NAME) &&
>         getConnection().isTableDisabled(tableName)) {
>        throw new TableNotEnabledException(tableName.getNameAsString() + " is 
> disabled.");
>      }
> {code}
> It will throw NPE if tableName is null and invoking {{tableName.equals}}. 
> We'll add null checker in such places.



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