mybatis查询报空指针

前段时间遇到了一个问题，mybatis查询时，报错了，报了一个空指针。查询别的表的时候不报错，就这个表报错

### Cause: java.lang.NullPointerException
	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:149)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:140)
	at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:76)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
	at java.lang.reflect.Method.invoke(Method.java:498)
	at org.mybatis.spring.SqlSessionTemplate$SqlSessionInterceptor.invoke(SqlSessionTemplate.java:426)
	... 75 common frames omitted
Caused by: java.lang.NullPointerException: null
	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visit(AbstractParseTreeVisitor.java:18)
	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.createProjection(MySQLDMLVisitor.java:446)
	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitProjection(MySQLDMLVisitor.java:434)
	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitProjection(MySQLDMLVisitor.java:127)
	at org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser$ProjectionContext.accept(MySQLStatementParser.java:5370)
	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visit(AbstractParseTreeVisitor.java:18)
	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitProjections(MySQLDMLVisitor.java:410)
	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitProjections(MySQLDMLVisitor.java:127)
	at org.apache.shardingsphere.sql.parser.autogen.MySQLStatementParser$ProjectionsContext.accept(MySQLStatementParser.java:4865)
	at org.antlr.v4.runtime.tree.AbstractParseTreeVisitor.visit(AbstractParseTreeVisitor.java:18)
	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitSelectClause(MySQLDMLVisitor.java:329)
	at org.apache.shardingsphere.sql.parser.mysql.visitor.impl.MySQLDMLVisitor.visitSelectClause(MySQLDMLVisitor.java:127)

 最开始以为是分表的原因，后来查了网上的资料，是表里面有关键字导致的。查看异常信息时，忽略了最上面的提示：

line 1:176 no viable alternative at input 'exclusive'
line 1:176 mismatched input 'exclusive' expecting {'!', '~', '+', '-', '.', '(', '{', '?', '@', TRUNCATE, POSITION, VIEW, VALUES, CASE, CAST, TRIM, SUBSTRING, LEFT, RIGHT, IF, NOT, NULL, TRUE, FALSE, EXISTS, ANY, OFFSET, BEGIN, COMMIT, ROLLBACK, SAVEPOINT, BOOLEAN, CHAR, INTERVAL, DATE, TIME, TIMESTAMP, LOCALTIME, LOCALTIMESTAMP, YEAR, QUARTER, MONTH, WEEK, DAY, HOUR, MINUTE, SECOND, MICROSECOND, MAX, MIN, SUM, COUNT, AVG, CURRENT, ENABLE, DISABLE, INSTANCE, DO, DEFINER, CASCADED, LOCAL, CLOSE, OPEN, NEXT, NAME, TYPE, DATABASE, TABLES, TABLESPACE, COLUMNS, FIELDS, INDEXES, STATUS, REPLACE, MODIFY, VALUE, DUPLICATE, FIRST, LAST, AFTER, OJ, MOD, ACCOUNT, USER, ROLE, START, TRANSACTION, ROW, WITHOUT, BINARY, ESCAPE, SUBPARTITION, STORAGE, SUPER, SUBSTR, TEMPORARY, THAN, UNBOUNDED, SIGNED, UPGRADE, VALIDATION, ROLLUP, SOUNDS, UNKNOWN, OFF, ALWAYS, COMMITTED, LEVEL, NO, PASSWORD, PRIVILEGES, ACTION, ALGORITHM, AUTOCOMMIT, BTREE, CHAIN, CHARSET, CHECKSUM, CIPHER, CLIENT, COALESCE, COMMENT, COMPACT, COMPRESSED, COMPRESSION, CONNECTION, CONSISTENT, CONVERT, DATA, DISCARD, DISK, ENCRYPTION, END, ENGINE, EVENT, EXCHANGE, EXECUTE, EXTRACT, FILE, FIXED, FOLLOWING, GLOBAL, HASH, IMPORT_, LESS, MATCH, MEMORY, NONE, NOW, PARSER, PARTIAL, PARTITIONING, PERSIST, PRECEDING, PROCESS, PROXY, QUICK, REBUILD, REDUNDANT, RELOAD, REMOVE, REORGANIZE, REPAIR, REVERSE, SESSION, SHUTDOWN, SIMPLE, SLAVE, VISIBLE, INVISIBLE, ENFORCED, AGAINST, LANGUAGE, MODE, QUERY, EXTENDED, EXPANSION, VARIANCE, MAX_ROWS, MIN_ROWS, SQL_BIG_RESULT, SQL_BUFFER_RESULT, SQL_CACHE, SQL_NO_CACHE, STATS_AUTO_RECALC, STATS_PERSISTENT, STATS_SAMPLE_PAGES, ROW_FORMAT, WEIGHT_STRING, COLUMN_FORMAT, INSERT_METHOD, KEY_BLOCK_SIZE, PACK_KEYS, PERSIST_ONLY, BIT_AND, BIT_OR, BIT_XOR, GROUP_CONCAT, JSON_ARRAYAGG, JSON_OBJECTAGG, STD, STDDEV, STDDEV_POP, STDDEV_SAMP, VAR_POP, VAR_SAMP, AUTO_INCREMENT, AVG_ROW_LENGTH, DELAY_KEY_WRITE, CURRENT_TIMESTAMP, ROTATE, MASTER, BINLOG, ERROR, SCHEDULE, COMPLETION, EVERY, HOST, SOCKET, PORT, SERVER, WRAPPER, OPTIONS, OWNER, RETURNS, CONTAINS, SECURITY, INVOKER, TEMPTABLE, MERGE, UNDEFINED, DATAFILE, FILE_BLOCK_SIZE, EXTENT_SIZE, INITIAL_SIZE, AUTOEXTEND_SIZE, MAX_SIZE, NODEGROUP, WAIT, LOGFILE, UNDOFILE, UNDO_BUFFER_SIZE, REDO_BUFFER_SIZE, HANDLER, PREV, ORGANIZATION, DEFINITION, DESCRIPTION, REFERENCE, FOLLOWS, PRECEDES, IMPORT, CONCURRENT, XML, DUMPFILE, SHARE, CODE, CONTEXT, SOURCE, CHANNEL, CLONE, AGGREGATE, INSTALL, COMPONENT, UNINSTALL, RESOURCE, EXPIRE, NEVER, HISTORY, OPTIONAL, REUSE, MAX_QUERIES_PER_HOUR, MAX_UPDATES_PER_HOUR, MAX_CONNECTIONS_PER_HOUR, MAX_USER_CONNECTIONS, RETAIN, RANDOM, OLD, ISSUER, SUBJECT, CACHE, GENERAL, SLOW, USER_RESOURCES, EXPORT, RELAY, HOSTS, FLUSH, RESET, RESTART, UNIX_TIMESTAMP, LOWER, UPPER, ADDDATE, ADDTIME, DATE_ADD, DATE_SUB, DATEDIFF, DATE_FORMAT, DAYNAME, DAYOFMONTH, DAYOFWEEK, DAYOFYEAR, STR_TO_DATE, TIMEDIFF, TIMESTAMPADD, TIMESTAMPDIFF, TIME_FORMAT, TIME_TO_SEC, AES_DECRYPT, AES_ENCRYPT, FROM_BASE64, TO_BASE64, GEOMCOLLECTION, GEOMETRYCOLLECTION, LINESTRING, MULTILINESTRING, MULTIPOINT, MULTIPOLYGON, POINT, POLYGON, ST_AREA, ST_ASBINARY, ST_ASGEOJSON, ST_ASTEXT, ST_ASWKB, ST_ASWKT, ST_BUFFER, ST_BUFFER_STRATEGY, ST_CENTROID, ST_CONTAINS, ST_CONVEXHULL, ST_CROSSES, ST_DIFFERENCE, ST_DIMENSION, ST_DISJOINT, ST_DISTANCE, ST_DISTANCE_SPHERE, ST_ENDPOINT, ST_ENVELOPE, ST_EQUALS, ST_EXTERIORRING, ST_GEOHASH, ST_GEOMCOLLFROMTEXT, ST_GEOMCOLLFROMTXT, ST_GEOMCOLLFROMWKB, ST_GEOMETRYCOLLECTIONFROMTEXT, ST_GEOMETRYCOLLECTIONFROMWKB, ST_GEOMETRYFROMTEXT, ST_GEOMETRYFROMWKB, ST_GEOMETRYN, ST_GEOMETRYTYPE, ST_GEOMFROMGEOJSON, ST_GEOMFROMTEXT, ST_GEOMFROMWKB, ST_INTERIORRINGN, ST_INTERSECTION, ST_INTERSECTS, ST_ISCLOSED, ST_ISEMPTY, ST_ISSIMPLE, ST_ISVALID, ST_LATFROMGEOHASH, ST_LATITUDE, ST_LENGTH, ST_LINEFROMTEXT, ST_LINEFROMWKB, ST_LINESTRINGFROMTEXT, ST_LINESTRINGFROMWKB, ST_LONGFROMGEOHASH, ST_LONGITUDE, ST_MAKEENVELOPE, ST_MLINEFROMTEXT, ST_MLINEFROMWKB, ST_MULTILINESTRINGFROMTEXT, ST_MULTILINESTRINGFROMWKB, ST_MPOINTFROMTEXT, ST_MPOINTFROMWKB, ST_MULTIPOINTFROMTEXT, ST_MULTIPOINTFROMWKB, ST_MPOLYFROMTEXT, ST_MPOLYFROMWKB, ST_MULTIPOLYGONFROMTEXT, ST_MULTIPOLYGONFROMWKB, ST_NUMGEOMETRIES, ST_NUMINTERIORRING, ST_NUMINTERIORRINGS, ST_NUMPOINTS, ST_OVERLAPS, ST_POINTFROMGEOHASH, ST_POINTFROMTEXT, ST_POINTFROMWKB, ST_POINTN, ST_POLYFROMTEXT, ST_POLYFROMWKB, ST_POLYGONFROMTEXT, ST_POLYGONFROMWKB, ST_SIMPLIFY, ST_SRID, ST_STARTPOINT, ST_SWAPXY, ST_SYMDIFFERENCE, ST_TOUCHES, ST_TRANSFORM, ST_UNION, ST_VALIDATE, ST_WITHIN, ST_X, ST_Y, IO_THREAD, SQL_THREAD, SQL_BEFORE_GTIDS, SQL_AFTER_GTIDS, MASTER_LOG_FILE, MASTER_LOG_POS, RELAY_LOG_FILE, RELAY_LOG_POS, SQL_AFTER_MTS_GAPS, UNTIL, DEFAULT_AUTH, PLUGIN_DIR, STOP, IDENTIFIER_, STRING_, NUMBER_, HEX_DIGIT_, BIT_NUM_}
2021-10-09 18:18:54 nacos WARN [com.zaxxer.hikari.pool.HikariPool] HikariPool-1 - Thread starvation or clock leap detected (housekeeper delta=2m33s284ms583µs547ns).

 就是因为表里面包含了这个关键字：exclusive， 把这个关键字改为别的名字后，就可以正常查询了。