hibernate中使用autoDDL时，没有声明的jpa表，在项目启动时报找不到表异常

1. 先根据异常中说不存在的表的表名去项目里全局搜索，是否有jpa实体声明或引用，确保项目里没有的情况下

2. 去所连接的数据库中搜索，是否存在这张表，如果存在

3. 检查表名，我所遇到的情况是，表名头部带了空格。导致hibernate启动的时候会扫描整个数据库里的表的元数据信息时，对表名查询时找不到此表。

org.hibernate.exception.SQLGrammarException: Error accessing tables metadata
	at org.hibernate.exception.internal.SQLExceptionTypeDelegate.convert(SQLExceptionTypeDelegate.java:63)
	at org.hibernate.exception.internal.StandardSQLExceptionConverter.convert(StandardSQLExceptionConverter.java:42)
	at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:113)
	at org.hibernate.engine.jdbc.spi.SqlExceptionHelper.convert(SqlExceptionHelper.java:99)
	at org.hibernate.tool.schema.extract.internal.InformationExtractorJdbcDatabaseMetaDataImpl.convertSQLException(InformationExtractorJdbcDatabaseMetaDataImpl.java:102)
	at org.hibernate.tool.schema.extract.internal.InformationExtractorJdbcDatabaseMetaDataImpl.populateTablesWithColumns(InformationExtractorJdbcDatabaseMetaDataImpl.java:387)
	at org.hibernate.tool.schema.extract.internal.InformationExtractorJdbcDatabaseMetaDataImpl.getTables(InformationExtractorJdbcDatabaseMetaDataImpl.java:341)
	at org.hibernate.tool.schema.extract.internal.DatabaseInformationImpl.getTablesInformation(DatabaseInformationImpl.java:120)
	at org.hibernate.tool.schema.internal.GroupedSchemaMigratorImpl.performTablesMigration(GroupedSchemaMigratorImpl.java:65)
	at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.performMigration(AbstractSchemaMigrator.java:207)
	at org.hibernate.tool.schema.internal.AbstractSchemaMigrator.doMigration(AbstractSchemaMigrator.java:114)
	at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.performDatabaseAction(SchemaManagementToolCoordinator.java:184)
	at org.hibernate.tool.schema.spi.SchemaManagementToolCoordinator.process(SchemaManagementToolCoordinator.java:73)
Caused by: java.sql.SQLSyntaxErrorException: Table 'xxx' doesn't exist
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:120)
	at com.mysql.cj.jdbc.exceptions.SQLError.createSQLException(SQLError.java:97)
	at com.mysql.cj.jdbc.exceptions.SQLExceptionsMapping.translateException(SQLExceptionsMapping.java:122)
	at com.mysql.cj.jdbc.StatementImpl.executeQuery(StatementImpl.java:1200)
	at com.mysql.cj.jdbc.DatabaseMetaData$2.forEach(DatabaseMetaData.java:2141)
	at com.mysql.cj.jdbc.DatabaseMetaData$2.forEach(DatabaseMetaData.java:2070)
	at com.mysql.cj.jdbc.IterateBlock.doForAll(IterateBlock.java:56)
	at com.mysql.cj.jdbc.DatabaseMetaData.getColumns(DatabaseMetaData.java:2246)
	at com.mchange.v2.c3p0.impl.NewProxyDatabaseMetaData.getColumns(NewProxyDatabaseMetaData.java:3068)
	at org.hibernate.tool.schema.extract.internal.InformationExtractorJdbcDatabaseMetaDataImpl.populateTablesWithColumns(InformationExtractorJdbcDatabaseMetaDataImpl.java:354)
           

问题很隐蔽，解决的时候还是很爽的。