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From "ZhaoYang (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (CASSANDRA-13592) Null Pointer exception at SELECT JSON statement
Date Tue, 27 Jun 2017 08:44:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-13592?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16064405#comment-16064405
] 

ZhaoYang edited comment on CASSANDRA-13592 at 6/27/17 8:43 AM:
---------------------------------------------------------------

In Json path, the bytebuffer is being consumed with position = capacity. So in page-state,
no partition key bytes are written.  

Using bf.duplicate() would fix this issue.

{code}
    public static List<ByteBuffer> rowToJson(List<ByteBuffer> row, ProtocolVersion
protocolVersion, ResultSet.ResultMetadata metadata)
    {
        StringBuilder sb = new StringBuilder("{");
        for (int i = 0; i < metadata.names.size(); i++)
        {
            if (i > 0)
                sb.append(", ");

            ColumnSpecification spec = metadata.names.get(i);
            String columnName = spec.name.toString();
            if (!columnName.equals(columnName.toLowerCase(Locale.US)))
                columnName = "\"" + columnName + "\"";

            ByteBuffer buffer = row.get(i);
            sb.append('"');
            sb.append(Json.quoteAsJsonString(columnName));
            sb.append("\": ");
            if (buffer == null)
                sb.append("null");
            else
                // use duplicate() to avoid buffer being consumed
                sb.append(spec.type.toJSONString(buffer.duplicate(), protocolVersion));
        }
        sb.append("}");
        return Collections.singletonList(UTF8Type.instance.getSerializer().serialize(sb.toString()));
    }
{code}


was (Author: jasonstack):
it seems like driver issue.. it swallowed the keys paging state..

> Null Pointer exception at SELECT JSON statement
> -----------------------------------------------
>
>                 Key: CASSANDRA-13592
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-13592
>             Project: Cassandra
>          Issue Type: Bug
>          Components: CQL
>         Environment: Debian Linux
>            Reporter: Wyss Philipp
>              Labels: beginner
>         Attachments: system.log
>
>
> A Nulll pointer exception appears when the command
> {code}
> SELECT JSON * FROM examples.basic;
> ---MORE---
> <Error from server: code=0000 [Server error] message="java.lang.NullPointerException">
> Examples.basic has the following description (DESC examples.basic;):
> CREATE TABLE examples.basic (
>     key frozen<tuple<uuid, int>> PRIMARY KEY,
>     wert text
> ) WITH bloom_filter_fp_chance = 0.01
>     AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
>     AND comment = ''
>     AND compaction = {'class': 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
'max_threshold': '32', 'min_threshold': '4'}
>     AND compression = {'chunk_length_in_kb': '64', 'class': 'org.apache.cassandra.io.compress.LZ4Compressor'}
>     AND crc_check_chance = 1.0
>     AND dclocal_read_repair_chance = 0.1
>     AND default_time_to_live = 0
>     AND gc_grace_seconds = 864000
>     AND max_index_interval = 2048
>     AND memtable_flush_period_in_ms = 0
>     AND min_index_interval = 128
>     AND read_repair_chance = 0.0
>     AND speculative_retry = '99PERCENTILE';
> {code}
> The error appears after the ---MORE--- line.
> The field "wert" has a JSON formatted string.



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